A
Series
Signal Integrity’s A Series 0.4mm pitch spring probes provide a versatile range of contact solutions for fine-pitch semiconductor testing. This series offers specialized configurations for every test requirement, including the A1540 for high-current applications (up to 4.3 Amps) and the A1523 for high-frequency testing (>40 GHz). With operating lengths tailored for tight packaging and contact resistance as low as 20 mOhms, the A Series ensures reliable, transparent testing for WLCSP and strip test applications.
A SERIES: HIGH-PERFORMANCE 0.4MM PITCH SPRING PROBES
Engineered for high-volume manufacturing, the A Series 0.4mm pitch spring probes deliver industry-leading signal integrity and mechanical reliability. Compare our top models below to find the ideal balance of current handling, spring force, and resistance for your specific test environment.
| Model | Initial Length (inch / mm) |
Op. Position (inch / mm) |
Spring Force | Bandwidth (Insertion Loss) |
Current (Max) |
Resistance | Inductance |
|---|---|---|---|---|---|---|---|
| A1523 | CALL | CALL | 11g | >40 GHz | – | – | – |
| A1540 | .126” / 3.20 | .114” / 2.90 | 22, 29g | 16.1 GHz | 4.3 A | 20 mΩ | 0.42 nH |
| A1520 | .081” / 2.05 | .075” / 1.90 | 20g | 24.1 GHz | 2.0 A | 60 mΩ | 0.44 nH |
| A1512 | .131” / 3.32 | .119” / 3.02 | 18, 29g | 20.3 GHz | 2.0 A | 72 mΩ | 0.66 nH |
| A1550 | .133” / 3.30 | .118” / 3.00 | 20, 29g | 18.7 GHz | 2.0 A | 85 mΩ | 0.71 nH |
| A1562 | .160” / 4.06 | .144” / 3.66 | 14, 30g | 11.6 GHz | 1.45 A | 90 mΩ | 0.80 nH |
| A1561 | .149” / 3.78 | .131” / 3.33 | 16, 29g | 7.4 GHz | 1.65 A | 90 mΩ | 0.67 nH |
| A1582 | .210” / 5.33 | .184” / 4.67 | 16, 30g | 9.6 GHz | 1.4 A | 100 mΩ | 0.93 nH |
| A1580 | .210” / 5.33 | .192” / 4.88 | 16, 32g | 7.4 GHz | 1.55 A | 95 mΩ | 1.02 nH |
| A1592 | .276” / 7.01 | .242” / 6.15 | 30 g | – | – | – | – |
| A1584 | .227” / 5.76 | .199” / 5.05 | 30 g | – | – | – | – |
| A1581 | .224” / 5.69 | .192” / 4.88 | 31 g | – | – | – | – |
| A1586 | .219” / 5.56 | .199” / 5.06 | 19, 20g | – | 1.68 A | – | – |
| A1553 | .195” / 4.95 | .171” / 4.35 | 20 g | – | – | – | – |
| A1560 | .159” / 4.04 | .141” / 3.58 | 22 g | – | – | – | – |
Overview
Key Features of Our 0.4mm Pitch Spring Probes
- Ultra-Fine Pitch Capability: Specifically tailored for packaging constraints down to 0.4mm pitch, making them ideal for high-density WLCSP and strip test applications.
- High-Frequency Performance: Excellent signal integrity with bandwidths capable of exceeding 40 GHz (A1523) and consistent performance up to 24.1 GHz (A1520).
- Material Excellence: Features solid precious metal alloy tips and plungers to ensure consistent low contact resistance (as low as 20 mOhms on the A1540) and long cycle life.
- High Current Handling: Industry-leading power capability, handling up to 4.3 Amps (A1540) in a compact 0.4mm form factor.
- Versatile Force Options: Standard operating forces ranging from 11g to 22g, with high-force options up to 32g available for specific contact requirements.
Semiconductor Contacts A Series – 0.4mm (.0157) pitch
A1523 – The High-Bandwidth Leader
Designed for high-frequency RF and microwave applications exceeding 40 GHz.
- Pitch: 0.4mm
- Bandwidth: > 40 GHz
- Force: 11g
- Application: High-Speed RF/Analog
A1540 – High Current Powerhouse
Industry-leading current handling for power management IC testing.
- Pitch: 0.4mm
- Current Rating: 4.3 A
- Resistance: 20 mΩ
- Bandwidth: 16.1 GHz
- Force: 22g, 29g
A1520 – Digital & RF Precision
The perfect balance of speed and resistance for digital data comms.
- Pitch: 0.4mm
- Bandwidth: 24.1 GHz
- Current Rating: 2.0 A
- Resistance: 60 mΩ
- Inductance: 0.44 nH
A1512 – Reliable & Robust
A proven solution for reliable contact in tight-pitch environments.
- Pitch: 0.4mm
- Bandwidth: 20.3 GHz
- Current Rating: 2.0 A
- Force: 18g, 29g
- Resistance: 72 mΩ
A1580 – Solid Performance
Features robust construction with high-force options for consistent contact.
The A1580 provides exceptional stability for high-cycle applications, offering higher spring force options to cut through oxides.
- Pitch: 0.4mm
- Force: 16g / 32g (High Force)
- Current: 1.55 A
- Inductance: 1.02 nH
Browse the full catalog of Signal Integrity High-Frequency Spring Probes here.