Side-by-Side Comparison
Power Connectors & PCB Packages
ATX & EPS Power Supply Pinouts vs. Surface Mount (SMD) Passive Packages
Comparing 2 standards across 13 specifications. 13 key differences identified.
Comparing:
ATX & EPS Power Supply Pinouts
Surface Mount (SMD) Passive Packages
Desktop PC power supplies deliver multi-rail DC power under Intel ATX12V and EPS12V standards through standardized Molex Mini-Fit Jr. connectors: 24-Pin ATX Main (+3.3V, +5V, +12V, -12V, +5VSB, PS_ON#), 8-Pin EPS12V CPU (+12V), and 6+2 Pin PCIe auxiliary power.
Surface Mount Device (SMD) passive chip components (resistors, capacitors, inductors) are standardized under EIA (Imperial code in hundredths of an inch) and JEDEC/IEC (Metric code in tenths of a millimeter), spanning from microscopic 01005 (0.4 × 0.2 mm) to high-power 2512 (6.3 × 3.2 mm) footprints.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
Intel ATX12V v2.52 / EPS12V v2.92 / SSI Specification / Molex Mini-Fit Jr. 4.2 mm pitch | EIA (Electronic Industries Alliance) / IPC-7351 / IEC 60115 (Fixed Resistors) |
|
24-Pin ATX Mainboard Connector
|
Delivers +3.3V (Orange), +5V (Red), +12V (Yellow), Ground (Black), +5VSB Standby (Purple), PS_ON# (Green) | — |
|
8-Pin EPS12V CPU Connector
|
4× +12V pins (Yellow) + 4× Ground pins (Black) | Maximum capacity: 336W (28A at 12V using 18 AWG) | — |
|
6+2 Pin PCIe Graphics Connector
|
3× +12V pins + 5× Ground/Sense pins | Rated for 150W (8-pin) or 75W (6-pin configuration) | — |
|
PS_ON# Activation Pin
|
Pin 16 on 24-pin (Green wire) | Short to any Ground (Black) to manually turn power supply on | — |
|
PWR_OK (Power Good) Signal
|
Pin 8 (Gray wire) | Outputs +5V when internal voltages stabilize within ±5% tolerance (100–500 ms) | — |
|
Standard Wire Gauges
|
18 AWG minimum for main lines (16 AWG on high-wattage Gold/Platinum units) | — |
|
EIA 0201 (Metric 0603)
|
— | 0.60 × 0.30 × 0.23 mm (0.024 × 0.012") | Power: 1/20W (0.05W) | Smartphones, smartwatches |
|
EIA 0402 (Metric 1005)
|
— | 1.00 × 0.50 × 0.35 mm (0.040 × 0.020") | Power: 1/16W (0.063W) | Universal modern high-density PCB standard |
|
EIA 0603 (Metric 1608)
|
— | 1.60 × 0.80 × 0.45 mm (0.063 × 0.031") | Power: 1/10W (0.10W) | Smallest size comfortable for manual hand soldering |
|
EIA 0805 (Metric 2012)
|
— | 2.00 × 1.25 × 0.55 mm (0.079 × 0.049") | Power: 1/8W (0.125W) | Automotive electronics, educational prototyping |
|
EIA 1206 (Metric 3216)
|
— | 3.20 × 1.60 × 0.60 mm (0.126 × 0.063") | Power: 1/4W (0.25W) | High-current decoupling, precision audio |
|
EIA 2512 (Metric 6432)
|
— | 6.30 × 3.20 × 0.60 mm (0.250 × 0.126") | Power: 1.0W to 2.0W | Current sense shunt resistors |