Part Data Review and Validation

flux

2:25

Analyzing the schematic.

Reviewing the bill of materials.

Analyzing the PCB layout.

Looking for "device overview description package pin count ordering information special features" in tps274c65

Looking for "absolute maximum ratings" in tps274c65

Looking for "recommended operating conditions" in tps274c65

Looking for "electrical characteristics" in tps274c65

Looking for "pin functions pin descriptions terminal functions" in tps274c65

Looking for "package dimensions mechanical data SHR package RHA package VQFN wettable flank thermal pad" in tps274c65

Looking for "functional features diagnostics protection current sense SPI LED outputs configurable address" in tps274c65

Cross-checking package dimensions.

Identifying project misstatements.

Looking for "RHA0040M package dimensions D E D2 E2 b e L A exact dimensions table" in tps274c65

Looking for "example board layout land pattern dimensions 40X 0.25 0.85 exposed pad 4.15 5.8 5.8 6 by 6 0.5 pitch" in tps274c65

I completed the review for TPS274C65ASHRHAR.
Step 1: Part information review

Project metadata vs datasheet

ItemIn part projectDatasheet scan resultStatus
MPNTPS274C65ASHRHARTPS274C65ASHRHARMatch
Datasheet URLPresent: PDFOfficial TI datasheetMatch
PackageProperty says TORHA, 40-pin VQFN, 6.0 mm x 6.0 mm, 0.5 mm pitchMismatch
Pin count41 schematic terminals including exposed pad40 pins + exposed padMatch
Description"12-V to 36-V 65-mohm four-channel..."TI describes 72 mOhm quad smart high-side switchMismatch
Part typeElectromechanical ComponentsPower switch IC / smart high-side switchMismatch
Step 2: Datasheet property check
A datasheet URL was already set on the part, so no web lookup or property update was needed.
Step 3: Datasheet scan summary

Device summary

FieldValue
FunctionQuad-channel smart high-side switch with SPI and diagnostics
Supply range12 V to 36 V nominal operating supply
Logic supply3.0 V to 5.5 V
On-resistance72 mOhm typ at 25 C
PackageRHA VQFN-40
Body size6.0 mm x 6.0 mm
Pitch0.50 mm
Max height1.0 mm
Variant featuresASH includes reverse current blocking, LED driver, ADC, current sense

Special features

FeaturePresent
SPI interfaceYes
Adjustable current limit290 mA to 2.45 A for ASH
Reverse current blockingYes
LED outputs4
Integrated ADCYes
Current senseYes
Thermal shutdownYes
Short-to-ground protectionYes
Wire-break / open-load diagnosticsYes
Short-to-supply detectionYes

Absolute maximum ratings

ParameterRating
VS continuous-0.3 V to 40 V
VS transient under 1 ms during ON state-0.3 V to 60 V
VOUT to GND-30 V to VS + 0.3 V
VDS-0.7 V to 39 V
VDD-0.3 V to 7.0 V
Digital input pins-0.3 V to 7.0 V
LED output pins-0.3 V to 7.0 V
REG_EN-0.3 V to 7.0 V
RCBxVOUT - 0.7 V to VOUT + 6 V
ISNS-0.3 V to 7.0 V
FLT-0.3 V to 7.0 V
Reverse ground current-50 mA
Junction temperature150 C max
Storage temperature-65 C to 150 C

Recommended operating conditions

ParameterRange
VS nominal supply12 V to 36 V
VDD3.0 V to 5.5 V
Digital input pins-0.3 V to 5.5 V
FLT pin-0.3 V to 5.5 V
LEDOUT pins-0.3 V to 5.5 V
REG_EN-0.3 V to 5.0 V
Operating ambient from orderable info-40 C to 125 C

Key electrical characteristics

ParameterValue
On-resistance RON72 mOhm typ at 25 C, 110 mOhm typ at 125 C
Parallel 2-channel RON33 mOhm typ at 25 C, 55 mOhm typ at 125 C
Internal VDD regulator output3.1 V min, 3.3 V typ, 3.6 V max
Internal VDD regulator current limit25 mA min, 50 mA max
Continuous load current per channel1.6 A typ with all channels on at 85 C
Continuous load current per channel2.5 A typ with two channels on at 85 C
VDD quiescent current1.0 mA typ to 1.3 mA typ depending condition
VS quiescent current1.4 mA typ to 2.8 mA typ depending condition
Current sense ratio IOUT / ISNS1160 typ
ADC reference2.72 V min, 2.8 V typ, 2.85 V max
ADC conversion update time128 us typ
Thermal shutdown warning110 C min, 130 C typ, 150 C max
Thermal shutdown160 C min, 185 C typ, 210 C max

Pin descriptions

Pin(s)Signal(s)Datasheet role
1~READYReady/status output
2~FLTOpen-drain fault output
3DO_ENGlobal output enable input
4VDDLogic supply input
5, 21GND_1, GND_2Ground
6ISNSAnalog current-sense output
7SDOSPI data output
8SDISPI data input
9SCLKSPI clock input
10~CSSPI chip select input
11RCB3Reverse current blocking gate for channel 3
12, 13OUT3_1, OUT3_2Channel 3 output
14-17VS_1, VS_2, VS_3, VS_4Main switch supply input
18, 19OUT4_1, OUT4_2Channel 4 output
20RCB4Reverse current blocking gate for channel 4
22-25LEDOUT1, LEDOUT2, LEDOUT3, LEDOUT4LED matrix driver outputs
26, 27DNC_1, DNC_2Do not connect
28DSPIDaisy-chain SPI mode input
29REG_ENInternal regulator enable
30ADDCFGSPI address configuration
31RCB2Reverse current blocking gate for channel 2
32, 33OUT2_1, OUT2_2Channel 2 output
34-37VS_5, VS_6, VS_7, VS_8Main switch supply input
38, 39OUT1_1, OUT1_2Channel 1 output
40RCB1Reverse current blocking gate for channel 1
EPEPExposed pad, connect to IC ground

Package dimensions

ParameterDatasheet value
Package codeRHA0040M
Package typeVQFN-40
Body size A x B5.9 mm to 6.1 mm square
Exposed pad D2 x E24.15 mm +/- 0.1 mm
Lead pitch e0.50 mm
Terminal width b0.20 mm to 0.30 mm
Terminal length L0.30 mm to 0.50 mm
Height A0.8 mm to 1.0 mm
TI example land pattern terminal size40x 0.25 mm x 0.6 mm
TI example exposed pad land4.15 mm square
Step 4: Symbol and footprint cross-check

Cross-check result

CheckResultRisk
Pin count41 terminals in project = 40 pins + exposed padOK
Pin numberingMatches datasheet numbering including EP as 41OK
Pin namesAS/ASH pin names align with datasheetOK
DNC pinsDNC_1 and DNC_2 presentOK
Footprint package familyFootprint filename indicates QFN50P600X600X100-41N-D, consistent with 0.5 mm pitch, 6x6 mm, 1.0 mm height, 41 terminals incl. EPOK
Exposed pad presentEP and pad 41 existOK
Metadata package propertyProject says TO instead of RHA / VQFN-40Ordering/library risk
Metadata part typeProject says Electromechanical ComponentsLibrary/search/BOM risk
Description valueProject says 65-mohm, datasheet says 72 mOhm typSpecification risk
Symbol pin electrical typesAll terminals are marked Unspecified in the symbolERC/usability risk
Footprint peripheral pad lengthFootprint uses 0.25 mm x 0.85 mm pads, TI example land pattern shows 0.25 mm x 0.6 mmManufacturing risk
Exposed pad sizeFootprint EP is 4.25 mm square, TI example land is 4.15 mmMinor assembly review item

Issues that should be fixed

PriorityIssueWhy it matters
HighPeripheral pads appear 0.85 mm long instead of TI's 0.6 mm recommendationOn a 0.5 mm pitch VQFN, longer pads can increase solder bridging and skew assembly yield
HighPackage property is TOCan cause wrong package identification and wrong ordering assumptions
MediumDescription says 65-mohm instead of 72 mOhm typCan mislead selection and review
MediumPart type is incorrectCan affect organization, filtering, and part reuse
MediumAll symbol pins are Unspecified rather than input/output/power/groundCan weaken ERC quality and make the part harder to use safely
LowExposed pad land is 4.25 mm vs TI example 4.15 mmUsually not fatal, but worth reviewing with stencil/paste strategy
Bottom line
  • The pin map is good and matches the ASH datasheet.
  • The footprint family is broadly correct for a 6 mm x 6 mm, 0.5 mm pitch VQFN-40 with EP.
  • The biggest concern is the outer pad length mismatch versus TI's recommended land pattern.
  • The project metadata also has clear package/type/spec mismatches that should be corrected before reuse or release.
If you want, I can next give you a precise fix list for the part project fields and footprint dimensions.
Fix list next
Check pin types
Review DRC risks
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    Assets

    kicad_mod

    TPS274C65ASHRHAR

    QFN50P600X600X100-41N-D.kicad_modFootprint
    stp

    TPS274C65ASHRHAR

    TPS274C65ASHRHAR.stp3D Model
    TPS274C65ASHRHAR-thumb.png

    TPS274C65ASHRHAR-thumb.png

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    TPS274C65ASHRHAR

    TPS274C65ASHRHAR

    TPS274C65ASHRHAR Symbol.svgDefault

    TPS274C65ASHRHAR

    TPS274C65ASHRHAR thumbnail
    Power Switch/Driver 1:1 N-Channel 2.6A 40-VQFN (6x6) #CommonPartsLibrary #IntegratedCircuit #PowerManagement

    Properties

    TPS274C65ASHRHAR

    Texas Instruments

    Electromechanical Components

    ti.com/lit/gpn/tps274c65

    IC

    TO

    creativecommons.org/licenses/by/4.0/

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