SMBJ48AHM3_A/H Equivalent & Substitute Parts

Part Overview

The SMBJ48AHM3_A/H is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for transient overvoltage protection in telecom applications, featuring a 48V reverse standoff voltage and 77.4V maximum clamping voltage. The part is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

SMBJ48AHM3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 999SMBJ48AHM3_A/H Datasheet

Current PartRFQ

SMBJ48AHM3_B/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 727SMBJ48AHM3_B/H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ48AHM3_A/H is determined by strict electrical and mechanical parameter matching within the TransZorb® series. The following parameters establish substitution eligibility:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 48V
• Voltage - Breakdown (Min): 53.3V
• Voltage - Clamping (Max) @ Ipp: 77.4V
• Current - Peak Pulse (10/1000µs): 7.8A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Unidirectional Channels: 1
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Automotive Grade: Yes
• AEC-Q101 Qualification: Yes

The SMBJ48AHM3_B/H meets all critical electrical and mechanical parameters, differing only in product status (Active vs. Obsolete) and packaging configuration (Bulk vs. standard). This part maintains identical functional performance and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ48AHM3_B/H is the direct equivalent for the obsolete SMBJ48AHM3_A/H. Both components are manufactured by Vishay within the TransZorb® series and maintain identical electrical specifications, thermal operating range, and automotive-grade certifications including AEC-Q101 qualification. The substitute part is currently in active production status, ensuring supply chain continuity.

Selection of SMBJ48AHM3_B/H is appropriate for new designs, production restocking, and field replacement applications where the SMBJ48AHM3_A/H is no longer available. Both parts satisfy identical design requirements for 48V telecom transient overvoltage protection circuits.

Frequently Asked Questions (FAQ)

Q: Can SMBJ48AHM3_B/H be used as a direct replacement for SMBJ48AHM3_A/H?

A: Yes. Both parts are electrically and mechanically identical, with matching voltage ratings (48V standoff, 77.4V clamping), current ratings (7.8A peak pulse), power dissipation (600W), package type (DO-214AA SMB), and automotive qualifications (AEC-Q101). The primary difference is product status: SMBJ48AHM3_A/H is obsolete while SMBJ48AHM3_B/H is active.

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

A: No. Both components use the DO-214AA (SMB) surface mount package with identical mechanical dimensions and land pattern requirements. No PCB layout modifications are necessary when substituting between these parts.

Q: What compliance certifications apply to both parts?

A: Both SMBJ48AHM3_A/H and SMBJ48AHM3_B/H are ROHS3 compliant, REACH unaffected, and carry automotive-grade classification with AEC-Q101 qualification. Moisture sensitivity level is 1 (Unlimited) for both parts.

Q: Are the electrical performance characteristics identical?

A: Yes. Both parts maintain identical reverse standoff voltage (48V typical), breakdown voltage (53.3V minimum), clamping voltage (77.4V maximum at peak pulse current), peak pulse current (7.8A at 10/1000µs), and peak pulse power (600W). Operating temperature range is -55°C to 150°C junction temperature for both.

Q: Which part should be specified for new designs?

A: SMBJ48AHM3_B/H should be specified for new designs due to its active product status and guaranteed long-term availability. This part provides identical performance to the obsolete SMBJ48AHM3_A/H without supply chain risk.