SMBJ120CAHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ120CAHM3_A/I is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring transient protection. This component features a 120V reverse standoff voltage with 193V maximum clamping voltage and 3.1A peak pulse current capability in a surface mount DO-214AA (SMB) package. The part is currently listed as obsolete, making identification of active equivalent substitutes essential for ongoing design support and procurement.

Substiute Parts

SMBJ120CAHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1090SMBJ120CAHM3_A/I Datasheet

Current PartRFQ

SMBJ120CAHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1103SMBJ120CAHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMBJ120CAHM3_A/I is determined by strict equivalence across the following critical electrical and mechanical parameters:

Voltage specifications must match exactly: 120V reverse standoff voltage, 133V minimum breakdown voltage, and 193V maximum clamping voltage at peak pulse current.

Current and power ratings must be identical: 3.1A peak pulse current (10/1000µs) and 600W peak pulse power.

Package and mounting configuration must be identical: DO-214AA (SMB) surface mount package.

Functional characteristics must be preserved: bidirectional single-channel Zener TVS diode for telecom transient protection.

Compliance and qualification standards must be maintained: AEC-Q101 automotive qualification, ROHS3 compliance, and REACH unaffected status.

The SMBJ120CAHM3_B/I is identified as the manufacturer-recommended substitute, maintaining all electrical specifications while transitioning from obsolete to active product status.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ120CAHM3_B/I is the direct equivalent for the obsolete SMBJ120CAHM3_A/I. Both components are manufactured by Vishay and maintain identical electrical specifications, thermal operating range, and package configuration. The primary distinction is product status: the substitute part is currently in active production, ensuring long-term availability and supply chain continuity.

Both parts carry AEC-Q101 automotive qualification and ROHS3 compliance, meeting regulatory requirements for automotive and telecom applications. The transition from the A/I variant to the B/I variant represents a standard product lifecycle update within the TransZorb® series, with no functional or performance degradation.

For new designs or component replenishment, the SMBJ120CAHM3_B/I should be specified to ensure procurement reliability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can SMBJ120CAHM3_B/I be used as a direct replacement for SMBJ120CAHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The B/I variant is the active production equivalent of the obsolete A/I variant.

Q: Are there any differences in package or mounting between these parts?

A: No. Both components use the DO-214AA (SMB) surface mount package with identical pinout and footprint compatibility.

Q: What is the significance of the A/I and B/I designations?

A: These designations indicate product lifecycle variants within the same electrical specification family. The B/I represents the current active production version, while the A/I is obsolete.

Q: Do both parts meet the same compliance standards?

A: Yes. Both SMBJ120CAHM3_A/I and SMBJ120CAHM3_B/I are AEC-Q101 qualified, ROHS3 compliant, and REACH unaffected.

Q: Are the electrical characteristics identical between the two parts?

A: Yes. Voltage ratings (120V standoff, 133V breakdown, 193V clamping), current specifications (3.1A peak pulse), power rating (600W), and operating temperature range (-55°C to 150°C) are identical.

Q: What applications are these TVS diodes designed for?

A: These components are specified for telecom transient protection applications requiring bidirectional voltage suppression in surface mount configurations.