P0640SA Equivalent & Substitute Parts

Part Overview

The P0640SA is a SIDACtor® Transient Voltage Suppressor (TVS) thyristor manufactured by Littelfuse Inc., designed for transient overvoltage protection in surface mount applications. This component features a 58V off-state voltage rating with 150A peak pulse current capability in a DO-214AA (SMB) package. The P0640SA is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

P0640SA

Littelfuse Inc.In Stock: 10279P0640SA Datasheet

Current PartRFQ

P0640SALRP

Littelfuse Inc.In Stock: 2196P0640SALRP Datasheet

DirectRFQ

SMTPA62

STMicroelectronicsIn Stock: 12728SMTPA62 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the P0640SA is determined by electrical and mechanical compatibility across the following critical parameters:

• Voltage ratings (breakover and off-state voltage within acceptable tolerance)
• Peak pulse current capability (8/20µs and 10/1000µs ratings)
• Hold current (Ih) specification
• Package type (DO-214AA, SMB) for mechanical and thermal compatibility
• Number of elements (single element configuration)

Two substitute parts are identified based on these criteria: P0640SALRP (direct Littelfuse equivalent) and SMTPA62 (manufacturer-recommended cross-reference from STMicroelectronics).

Parameter Comparison

Engineering Selection Recommendations

P0640SALRP is the direct equivalent substitute for the P0640SA. Both parts share identical electrical specifications across all critical parameters and are manufactured by Littelfuse Inc. within the same SIDACtor® series. The P0640SALRP is currently in active production status with ROHS3 compliance, addressing the obsolescence of the original P0640SA. The primary difference is packaging format (Tape & Reel versus bulk), with a minor capacitance variance (60pF versus 50pF) that does not affect functional compatibility.

SMTPA62 is a manufacturer-recommended cross-reference from STMicroelectronics. This part maintains the same peak pulse current rating (150A at 8/20µs) and hold current (150mA) as the P0640SA. Voltage ratings differ slightly: the SMTPA62 features a 62V off-state voltage and 82V breakover voltage compared to the P0640SA's 58V and 77V respectively. The SMTPA62 also exhibits lower capacitance (40pF) and marginally higher peak pulse current at 10/1000µs (50A versus 45A). Both substitute parts are ROHS3 compliant and currently in active production.

Frequently Asked Questions (FAQ)

Q: Can P0640SALRP be used as a direct replacement for P0640SA?

A: Yes. P0640SALRP is the direct Littelfuse equivalent with identical electrical specifications. The primary distinction is packaging format (Tape & Reel). Both parts are rated for 58V off-state voltage, 77V breakover voltage, and 150A peak pulse current (8/20µs).

Q: What are the voltage differences between P0640SA and SMTPA62?

A: The SMTPA62 has a 62V off-state voltage and 82V breakover voltage, compared to the P0640SA's 58V and 77V respectively. These represent approximately 7% and 6% increases in voltage ratings. Circuit design must account for these differences in overvoltage protection thresholds.

Q: Are all three parts mechanically compatible?

A: Yes. All three parts use the DO-214AA (SMB) surface mount package, ensuring identical PCB footprint and thermal characteristics. No layout modifications are required for mechanical substitution.

Q: What is the significance of the capacitance differences?

A: Capacitance values vary: P0640SA (50pF), P0640SALRP (60pF), and SMTPA62 (40pF). These differences may affect high-frequency circuit behavior and EMI characteristics. Circuit validation is necessary if capacitance-sensitive applications are involved.

Q: Why is RoHS compliance important for this substitution?

A: The P0640SA is RoHS non-compliant, while both P0640SALRP and SMTPA62 are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, only the compliant substitutes are acceptable.

Q: Which substitute should be selected for new designs?

A: Selection depends on voltage tolerance requirements and compliance mandates. P0640SALRP maintains exact electrical specifications and is the preferred choice for direct replacement. SMTPA62 is suitable when higher voltage ratings (62V/82V) are acceptable and STMicroelectronics supply chain is preferred.