Project Overview and Analysis

flux

2:53

Considering component recommendations.

Organizing component queries.

Searching for components.

Searching library for: "Recommend TVS diodes for protecting a nominal 12 V DC power input on an embedded board. Prioritize unidirectional surge suppressors appropriate for a 12 V rail that may see automotive-like transients or adapter hot-plug spikes. I want practical PCB-friendly options with datasheets, package, standoff or breakdown suitable above the maximum normal input voltage, and reasonable clamping behavior. Include availability fields."

Searching library for: "Recommend reverse polarity protection components for a nominal 12 V DC input on a low-power embedded PCB. I am interested in practical options such as Schottky diodes for simple series protection and P-channel MOSFETs or ideal-diode style parts for lower-loss protection. Prioritize PCB-friendly parts with datasheets and availability."

Creating search plan for: "Recommend TVS diodes for protecting a nominal 12 V DC power input on an embedded board. Prioritize unidirectional surge suppressors appropriate for a 12 V rail that may see automotive-like transients or adapter hot-plug spikes. I want practical PCB-friendly options with datasheets, package, standoff or breakdown suitable above the maximum normal input voltage, and reasonable clamping behavior. Include availability fields. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] facetFilters: ["part_type:Diode"] hitsPerPage: 5"

Creating search plan for: "Recommend reverse polarity protection components for a nominal 12 V DC input on a low-power embedded PCB. I am interested in practical options such as Schottky diodes for simple series protection and P-channel MOSFETs or ideal-diode style parts for lower-loss protection. Prioritize PCB-friendly parts with datasheets and availability. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 8"

Searching: "Reverse-polarity protection for nominal 12V DC input; low-loss solution using a P-channel MOSFET as an ideal diode; prefer SOT-23 or SOT-23-3 package, low Rds(on) at -10V gate, and datasheet availability"

Searching: "12V ideal-diode / load-switch IC that controls external MOSFET for reverse-polarity protection; compact package (SO-8 / SOT-23), includes current limiting or thermal protection if possible"

Found 48 results.

Searching: "Recommend reverse polarity protection components for a nominal 12 V DC input on a low-power embedded PCB. I am interested in practical options such as Schottky diodes for simple series protection and P-channel MOSFETs or ideal-diode style parts for lower-loss protection. Prioritize PCB-friendly parts with datasheets and availability. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] hitsPerPage: 8"

Searching: "Unidirectional TVS diode for 12 V automotive power rail; VRWM ~13-16V; breakdown above normal input; surge rating >=600W; low clamping; PCB SMB/SMC/SOD-128/DO-214 packages; automotive/transient protection, include availability and datasheet"

Found 15 results.

Searching: "Recommend TVS diodes for protecting a nominal 12 V DC power input on an embedded board. Prioritize unidirectional surge suppressors appropriate for a 12 V rail that may see automotive-like transients or adapter hot-plug spikes. I want practical PCB-friendly options with datasheets, package, standoff or breakdown suitable above the maximum normal input voltage, and reasonable clamping behavior. Include availability fields. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","specifications","availability","packaging"] facetFilters: ["part_type:Diode"] hitsPerPage: 5"

Finished searching for components.

Looking for "Key protection specs: working standoff voltage, breakdown voltage, clamping voltage, peak pulse power, polarity, package, and recommended use on a 12 V input." in 2304140030_STMicroelectronics-SMBJ12A-TR_C133677.pdf

Looking for "Key specs for reverse polarity protection: drain-source voltage, gate-source voltage, Rds(on), package, and suitability as a high-side P-channel MOSFET on a 12 V input." in ds31447.pdf

Looking for "Key specs for reverse polarity protection: input operating voltage range, reverse protection / ideal diode behavior, package, and why to use it on a 12 V input with an external MOSFET." in lm5050-2.pdf

Looking for "Key specs for reverse polarity protection: repetitive peak reverse voltage, average forward current, forward voltage, package, and suitability as a series diode on a 12 V input." in PMEG4010EH_EJ_ET-1360330.pdf

For the 12 V input, I’d recommend a TVS diode across VIN-to-GND plus one reverse-polarity stage in series/high-side. For a TVS, the selection rule is to keep its voltage rating above the maximum normal input voltage so it does not false-trigger in normal operation, and for reverse-polarity protection you should explicitly choose between a series diode path with voltage drop or a MOSFET/ideal-diode path with lower loss.
Recommended parts

TVS diode options

RoleRecommended partWhy it fits
Tight clamp for regulated 12 V adapter inputSMBJ12A-TRDatasheet shows 12 V VRWM, 13.3 V to 14.0 V VBR, 19.9 V max clamp @ 31 A (10/1000 µs), 600 W peak pulse power, unidirectional, SMB package. Good if your input really stays near 12 V nominal.
More headroom for “12 V” systems that can rise above 12 VSMBJ14A-HRBetter conceptual fit if your rail can sit near 13.8 V to 14.4 V. I found it in the library, but I could not verify its exact datasheet values from the datasheet tool, so I would treat it as a candidate, not the primary recommendation yet.

Reverse-polarity protection options

ApproachRecommended partWhy it fitsTrade-off
Simple, low-costPMEG4010EH,115Datasheet explicitly lists reverse-polarity protection use. Rated 40 V, 1 A, with about 295 mV typ @ 100 mA, 420 mV typ @ 500 mA, 540 mV typ @ 1 A.Easiest option, but wastes voltage and power.
Low-loss discrete high-side protectionDMP3098L-7P-channel MOSFET, -30 V VDS, ±20 V VGS, 120 mOhm max @ -4.5 V, SOT-23. Good for a compact high-side reverse-polarity circuit on a 12 V rail.Lower loss than a diode, but slightly more design effort.
Most robust low-loss solutionLM5050-2Datasheet supports 6 V to 75 V operation, uses an external N-MOSFET as an ideal diode, and regulates only a very small forward drop. Best if you want efficient reverse blocking and backfeed protection.Highest complexity and BOM count.
My recommendation for this project Best practical combo
That gives you:
  • good surge suppression at the connector
  • much lower conduction loss than a series Schottky
  • low part count
If you want the simplest possible circuit
Use this only if the input current is modest and you can tolerate the forward drop.
If you want the most robust production-grade input stage
  • TVS: SMBJ12A-TR or a verified 14 V-class TVS
  • Ideal-diode controller: LM5050-2
  • External N-MOSFET selected to match your input current
Important selection notes
  • If your “12 V” source can actually reach 13.8 V to 14.4 V, a 12 V TVS can be too aggressive. In that case, I’d move to a verified 14 V standoff TVS rather than blindly using SMBJ12A-TR.
  • A series Schottky like PMEG4010EH,115 is simple, but you pay for it in dropout and heat.
  • A P-channel MOSFET like DMP3098L-7 is usually the sweet spot for embedded 12 V boards.
  • An ideal-diode controller like LM5050-2 is best when efficiency and reverse-current control really matter.
If you want, I can next narrow this to “best parts for your actual input current and source type” and give you one final TVS + reverse-polarity schematic recommendation.
Pick low-loss combo
Use automotive headroom
Simplest low-cost option
Check library availability
27 days
roguepenguin

roguepenguin

ok I want to adapt this project to my own. I plan to create a beehive monitor with a weight scale, a few temp sensors among others
14 days

flux

0:02

14 days
Sign up to send
PP5V0
PP3V3
PP3V3
PP3V3_SPI
PP3V3
PP5V0
PP3V3
PP12V0
PP3V3
PP3V3
PG_PP5V0
USBC2.0_D_N
SPI_MISO
I2C_SDA
SPI_SCK
USBC2.0_D_P
I2C_SCL
LOAD_CELL_A1_P
SPI_SCK
LOAD_CELL_A1_P
INT_ADC_DRDY
LOAD_CELL_AI_N
GPIO_SW1
I2C_SDA
GPIO_SW2
SPI_MISO
SPI_MOSI
LOAD_CELL_AI_N
I2C_SCL
SPI_CS
VOS
SPI_CS
SPI_MOSI
R3
Resistance
10kΩ
C7
Capacitance
1uF
C13
Capacitance
1uF
C23
Capacitance
.1uF
R1
Resistance
10kΩ
C18
Capacitance
1uF
C20
Capacitance
1uF
C10
Capacitance
1uF
C15
Capacitance
1uF
C5
Capacitance
1uF
R5
Resistance
10kΩ
C12
Capacitance
1uF
C11
Capacitance
1uF
C24
Capacitance
1uF
C31
Capacitance
.1uF
H4
H1
C2
Manufacturer Part Number
OPT
C25
Capacitance
22uF
Y1
R7
Resistance
100kΩ
L1
Inductance
2.2nH
R8
Resistance
953kΩ
IC1
H2
C8
Capacitance
13pF
H3
C6
Capacitance
1.2pF
R6
Resistance
180kΩ
L2
Inductance
2.2nH
C4
Capacitance
13pF
U2
C22
Capacitance
10uF
MCU_TXD
J1
C21
Capacitance
10uF
Y2
L4
C30
Capacitance
10uF
C1
Capacitance
10uF
MCU_RXD
MCU_BOOT
L3
Inductance
2.2uH
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
    jharwinbarrozo
    15.8k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

ESPRSSO32 Smart Scale AI Auto Layouted

ESPRSSO32 Smart Scale AI Auto Layouted thumbnail
Learn how to use AI Auto Layout on this ESP32 Espresso Smart Scale! In one click you’ll see AI Auto Layout perform magic. Pay close attention to how we recommend creating rulesets, zones, and fanouts. By copying the setup in this example on your own project, you’ll have a fully routed board in no time!

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$3.76–$4.70

Digi-Key

$6.29–$10.05

LCSC

$6.75–$7.60

Mouser

$8.56

Verical

$1.70–$2.37

Controls