Project Overview: JST PH Connector

Thought for 3 mins 30 sec

flux

Here’s what this project is and how it fits into a real design.

What it is

A library part for the 3‑pin, 2.0 mm‑pitch JST PH series, right‑angle, surface‑mount header: S3B-PH-SM4-TB(LF)(SN). It provides the schematic symbol and PCB footprint so you can place and wire this connector in your designs.

Purpose

Provide a reliable, compact wire‑to‑board interface for low‑power I/O or power leads where a 2.0 mm pitch, low profile, side‑entry (right‑angle) SMT header is desired.
Standardize symbol/footprint mapping so downstream schematics, layout, DRC, and manufacturing exports are consistent.

Core components and how they interact

Schematic symbol: three passive terminals — Pin_1, Pin_2, Pin_3. These represent the three circuits/pins of the connector and will be connected to your nets in the schematic.
PCB footprint: three SMT pads named to match pins 1–3. The symbol pins map 1:1 to footprint pads (Pad 1->Pin_1, etc.), ensuring the netlist drives correct copper pad connectivity at layout.

Key technologies and datasheet specs

Series: JST PH (wire‑to‑board, crimp style), 2.0 mm pitch, surface‑mount headers.
Header family and model coverage includes S3B‑PH‑SM4‑TB, with 2–16 positions available in the series.
From the JST PH series datasheet Datasheet:
- Pitch: 2.0 mm
- Current rating: 2 A AC/DC (AWG 24)
- Voltage rating: 100 V AC/DC
- Operating temperature: -40 C to +105 C (including temperature rise)
- Mating housings: e.g., PHR-3 (for 3 circuits)
- Crimp contacts: SPH-002T-P0.5S, SPH-002T-P0.5L (low‑insertion‑force option)
- SMT land pattern guidance (tolerances such as 2 ± 0.05 mm pitch; pattern dimensions and edge clearance for side‑entry) with notes to observe pitch tolerance ± 0.05 and not accumulate.
- The datasheet indicates pin‑1 marking and shows “No. 1 circuit” callouts on both symbol/land drawings; the footprint/silkscreen should reflect this.

Design, implementation, and functionality

Schematic
- The symbol exposes three passive pins: Pin_1, Pin_2, Pin_3.
- No nets are defined yet (this project is a reusable library part), so designers will connect these to signals like power, ground, or data in their specific application.
PCB footprint
- Three SMT pads correspond to the connector terminals; side‑entry geometry assumes the part sits at a board edge with specified keep‑back per datasheet notes (e.g., “Side edge of header on PCB” callout).
- Pin‑1 marker should be present and consistent with the datasheet orientation.
- Paste aperture and mask openings should follow land pattern guidance for reliable solder fillets and to manage mechanical loads from cable insertion/removal.

Design choices, trade‑offs, and optimizations

Right‑angle SMT versus through‑hole
- Pros: fast SMT assembly, low profile, minimal drill hits; good for compact designs.
- Cons: less robust to off‑axis cable forces vs through‑hole posts; pay special attention to pad anchoring and copper distribution.
2.0 mm PH versus smaller/larger families
- 2.0 mm offers a balance of compact size and current capability (2 A with AWG 24). Smaller pitch reduces size but typically lowers current and increases crimp fineness; larger pitch improves ruggedness but costs area.
Pin‑1 marking and orientation
- Strictly align symbol pin numbering to the header’s molded pin‑1 mark and the datasheet’s “No. 1 circuit” callouts to avoid wiring reversals in the mating harness.
Current and thermal headroom
- The datasheet rating is 2 A (AWG 24). Consider derating in warm environments or with continuous high current. If needed, parallel pins for return paths or move to a higher‑current family.

Potential challenges and performance considerations

Mechanical stress on SMT right‑angle headers
- Repeated cable cycling or side‑loads can peel pads. Use ample pad area, adequate paste volume, solder fillets, and copper tie‑ins to inner layers where feasible. Consider board stiffening near the edge.
Board‑edge clearance and keep‑outs
- Honor the land pattern’s side‑edge and keep‑back dimensions to ensure the housing clears the board edge and reflow fillets form correctly.
ESD and transient exposure
- Exposed connector pins can see ESD. Add line protection as appropriate (for example a TVS Diode) on sensitive lines.
Mating hardware availability
- You will need the correct housing and crimp contacts (e.g., PHR-3 with SPH-002T-P0.5S or SPH-002T-P0.5L). Ensure your supply chain supports both the PCB header and the mating cable set.

Real‑world applications

Low‑power battery leads, small peripheral power connectors, fan/sensor interfaces, or general three‑wire connections (V+, GND, signal) where compact size and serviceability are needed.

Areas for improvement and future enhancements

Symbol consistency and metadata
- The schematic parts show a “P” designator prefix on the terminals; for connectors it’s typical to use “J”. Consider publishing the symbol as a single connector instance with designator prefix “J” and named pins “1–3”.
Silkscreen and assembly layers
- Ensure a clear, unambiguous pin‑1 marker; add assembly and courtyard outlines with realistic assembly tolerances for pick‑and‑place.
Land pattern refinements
- Validate pad sizes and edge clearances exactly against the datasheet SMT land pattern and its ± 0.05 mm pitch tolerance note; tune paste aperture reductions to balance solder volume and mechanical strength.
3D model alignment
- Include/verify a 3D model aligned to the footprint to catch mechanical interferences (especially at the board edge or with nearby tall parts).
Variants and scalability
- Publish matching 2–16 position variants in the same family for consistent adoption across designs; add parametric fields (position count, pitch, right‑angle/vertical) to ease part selection.

Summary of current project contents

Schematic symbol exposes three terminals:
- Pin_1, Pin_2, Pin_3
Footprint provides three matching pads for the right‑angle SMT header.
Datasheet‑backed specs include 2.0 mm pitch, 2 A (AWG 24), 100 V, -40 C to +105 C, and specific SMT land pattern guidance Datasheet.

If you want, I can help review the symbol/footprint pin‑1 orientation against the datasheet diagrams or propose a connector “J” symbol with the correct metadata and a verified land pattern.

Verify pin-1 orientation

Pick exact connector MPN

Review footprint land pattern

Add ESD protection guidance

Improve symbol naming

Pin_1

Pin_2

Reviews

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
16.2k
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 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
Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
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
RMCF0805JT47K0
General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
jharwinbarrozo
1.2M
875105359001
10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
jharwinbarrozo
1.1M
1070TR
Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
jharwinbarrozo
700.5k