SMB8J20CAHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMB8J20CAHM3_A/I is a bidirectional transient voltage suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications. This device features a 20V reverse standoff voltage, 32.4V maximum clamping voltage, and 800W peak pulse power rating in a surface mount DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and new designs.

Substiute Parts

SMB8J20CAHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 821SMB8J20CAHM3_A/I Datasheet

Current PartRFQ

SMB8J20CAHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 712SMB8J20CAHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMB8J20CAHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 20V (identical)
• Voltage - Breakdown (Min): 22.2V (identical)
• Current - Peak Pulse (10/1000µs): 24.7A (identical)
• Power - Peak Pulse: 800W (identical)
• Package / Case: DO-214AA (SMB) (identical)
• Mounting Type: Surface Mount (identical)
• Operating Temperature Range: -55°C to 150°C (identical)
• Grade: Automotive (identical)
• Qualification: AEC-Q101 (identical)
• Series: TransZorb® (identical)
• Type: Zener, Bidirectional (identical)

The SMB8J20CAHM3_B/I is the manufacturer-recommended substitute, maintaining all electrical specifications and certifications while transitioning from obsolete to active product status.

Parameter Comparison

Engineering Selection Recommendations

The SMB8J20CAHM3_B/I is the direct equivalent for the obsolete SMB8J20CAHM3_A/I. Both parts maintain identical electrical performance across all critical parameters: 20V reverse standoff voltage, 22.2V minimum breakdown voltage, 24.7A peak pulse current, and 800W peak pulse power. Both are AEC-Q101 qualified automotive-grade components in the DO-214AA (SMB) surface mount package.

The transition from SMB8J20CAHM3_A/I to SMB8J20CAHM3_B/I is supported by active product status, ensuring long-term availability and supply chain continuity. Both parts comply with ROHS3 and maintain identical operating temperature ranges (-55°C to 150°C). The primary difference is packaging format: the substitute is supplied in Tape & Reel (TR) configuration, which is standard for high-volume production environments.

Frequently Asked Questions (FAQ)

Q: Can SMB8J20CAHM3_B/I be used as a direct replacement for SMB8J20CAHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters: reverse standoff voltage, breakdown voltage, peak pulse current, power rating, operating temperature range, package type (DO-214AA/SMB), and automotive qualification (AEC-Q101). The substitute is the manufacturer-recommended equivalent.

Q: What is the difference between the two part numbers?

A: The primary difference is product status and packaging format. SMB8J20CAHM3_A/I is obsolete and supplied in bulk packaging, while SMB8J20CAHM3_B/I is active and supplied in Tape & Reel (TR) format. All electrical specifications and certifications are identical.

Q: Are there any compatibility concerns when switching from SMB8J20CAHM3_A/I to SMB8J20CAHM3_B/I?

A: No compatibility concerns exist. Both parts use the identical DO-214AA (SMB) surface mount package, footprint, and pinout. PCB assembly processes and thermal management requirements remain unchanged.

Q: Does the Tape & Reel packaging affect performance or reliability?

A: No. Tape & Reel packaging is a supply and handling format only. It does not affect electrical performance, reliability, or operating characteristics. Both packaging formats contain the same component.

Q: Are both parts AEC-Q101 qualified?

A: Yes. Both SMB8J20CAHM3_A/I and SMB8J20CAHM3_B/I are AEC-Q101 qualified automotive-grade components, meeting the same reliability and qualification standards.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -55°C to 150°C (junction temperature), suitable for automotive and telecom applications across extended temperature environments.