SMBJ30A-M3/5B Equivalent & Substitute Parts

Part Overview

The SMBJ30A-M3/5B is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 30V reverse standoff category and is designed for general-purpose transient protection applications. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified to address packaging availability, inventory requirements, or specific manufacturing preferences while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	30	V
Voltage - Breakdown (Min)	33.3	V
Voltage - Clamping (Max) @ Ipp	48.4	V
Current - Peak Pulse (10/1000µs)	12.4	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	-
Mounting Type	Surface Mount	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ30A-M3/5B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 30V
Voltage - Breakdown (Min): 33.3V
Voltage - Clamping (Max) @ Ipp: 48.4V (±0.2V tolerance acceptable)
Current - Peak Pulse (10/1000µs): 12.4A (±2A tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1
Operating Temperature: -55°C minimum to 150°C maximum
RoHS Status: ROHS3 Compliant

Parts are grouped as direct substitutes when all electrical parameters match within specified tolerances and the package designation remains DO-214AA or SMB. Packaging format (Tape & Reel, Cut Tape, Digi-Reel) does not affect electrical compatibility but may influence procurement and handling procedures.

Parameter Comparison

Part Number	Manufacturer	Voltage Standoff (V)	Voltage Breakdown Min (V)	Voltage Clamp Max (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Temp Range (°C)	Package	Packaging Format	RoHS Status
SMBJ30A-M3/5B	Vishay	30	33.3	48.4	12.4	600	-55 to 150	DO-214AA, SMB	Tape & Reel	ROHS3
SMBJ30A-E3/52	Vishay	30	33.3	48.4	12.4	600	-55 to 150	DO-214AA, SMB	Cut Tape & Digi-Reel	ROHS3
SMBJ30A-E3/5B	Vishay	30	33.3	48.4	12.4	600	-55 to 150	DO-214AA, SMB	Tape & Reel	ROHS3
SMBJ30A	MDD	30	33.3	48.4	12.4	600	-55 to 150	DO-214AA, SMB	-	RoHS Compliant
SMBJ30A-13-F	Diodes Incorporated	30	33.3	48.4	12.4	600	-55 to 150	DO-214AA, SMB	Tape & Reel	ROHS3
SMBJ30A-TP	Micro Commercial Co	30	33.3	48.4	12.4	600	-55 to 175	DO-214AA, SMB	Tape & Reel	ROHS3
SACB30	Littelfuse Inc.	30	33.3	48.6	10	500	-55 to 150	DO-214AA, SMB	Tape & Reel	ROHS3
SMBJ30A-TR	STMicroelectronics	30	33.3	48.4	13	600	-55 to 150	DO-214AA, SMB	Cut Tape & Digi-Reel	ROHS3
SZ1SMB30AT3G	Littelfuse Inc.	30	33.3	48.4	12.4	600	-65 to 150	DO-214AA, SMB	Tape & Reel	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalents (Full Compatibility)

SMBJ30A-E3/52, SMBJ30A-E3/5B, SMBJ30A-13-F, SMBJ30A-TP, SMBJ30A-TR, and SZ1SMB30AT3G maintain identical or functionally equivalent electrical specifications to the SMBJ30A-M3/5B. All are active production parts with ROHS3 compliance. Selection among these parts is driven by packaging format availability and inventory requirements rather than electrical performance differences.

Conditional Equivalents (Parameter Variance)

SMBJ30A (MDD) meets all electrical specifications but carries RoHS Compliant status rather than ROHS3 designation. This part remains functionally suitable for applications where ROHS3 certification is not explicitly required.

SACB30 (Littelfuse Inc.) exhibits reduced peak pulse current (10A versus 12.4A) and peak pulse power (500W versus 600W). This part is suitable only for applications where the lower current and power ratings are acceptable within the design margin.

Extended Temperature Operation

SMBJ30A-TP extends the maximum operating temperature to 175°C, providing additional thermal margin for high-temperature environments compared to the standard 150°C maximum.

Automotive Grade

SZ1SMB30AT3G carries AEC-Q101 automotive qualification and extends the minimum operating temperature to -65°C, suitable for automotive and extended temperature range applications.

Frequently Asked Questions (FAQ)

Q: Can SACB30 be used as a direct replacement for SMBJ30A-M3/5B?

A: SACB30 is electrically compatible for general transient suppression but operates at reduced peak pulse current (10A versus 12.4A) and peak pulse power (500W versus 600W). Use only if circuit design accommodates these lower ratings.

Q: What is the difference between packaging formats (Tape & Reel, Cut Tape, Digi-Reel)?

A: Packaging format affects procurement, handling, and automated assembly procedures but does not alter electrical performance. Selection depends on manufacturing equipment compatibility and inventory management practices.

Q: Is SMBJ30A-TP suitable for high-temperature applications?

A: Yes. SMBJ30A-TP operates to 175°C maximum junction temperature, compared to 150°C for the SMBJ30A-M3/5B, providing additional thermal headroom in elevated temperature environments.

Q: Does SZ1SMB30AT3G require different circuit design considerations?

A: SZ1SMB30AT3G maintains identical electrical specifications but carries AEC-Q101 automotive qualification and operates to -65°C minimum. No circuit design changes are required; this part is suitable for automotive and extended temperature applications.

Q: Are all substitute parts RoHS compliant?

A: All listed substitutes carry either ROHS3 or RoHS Compliant status. ROHS3 represents the current compliance standard; RoHS Compliant indicates earlier certification. Both meet regulatory requirements for lead-free manufacturing.

Q: What determines whether a part can substitute for SMBJ30A-M3/5B?

A: Substitution requires matching voltage ratings (30V standoff, 33.3V breakdown minimum, 48.4V clamping maximum), peak pulse current within tolerance (12.4A ±2A), DO-214AA/SMB package designation, surface mount configuration, and zener type with single unidirectional channel. Operating temperature range must meet or exceed -55°C to 150°C.

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