SMBJ20A-M3/5B Transient Voltage Suppressor (TVS) Diode – Equivalent & Substitute Parts

Part Overview

The SMBJ20A-M3/5B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface-mount component operates in the DO-214AA (SMB) package and is designed for general-purpose transient voltage protection applications. The part is Active status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics (reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation) and mechanical compatibility (package type and mounting configuration).

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20	V
Voltage - Breakdown (Min)	22.2	V
Voltage - Clamping (Max) @ Ipp	32.4	V
Current - Peak Pulse (10/1000µs)	18.5	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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ20A-M3/5B are classified into two categories based on electrical and mechanical compatibility:

Direct Electrical Equivalents (Same Voltage Rating)

Parts that maintain identical or near-identical electrical specifications are considered direct substitutes. These parts share the following critical parameters:

Reverse Standoff Voltage: 20V (Typ)
Clamping Voltage: 32.4V (Max) @ Ipp
Peak Pulse Current: 18.5A
Power Dissipation: 600W
Package: DO-214AA (SMB)
Mounting: Surface Mount

Direct equivalents include SMBJ20A-E3/52 (Vishay), SMBJ20A (Good-Ark Semiconductor), SMBJ20A-13-F (Diodes Incorporated), and SMBJ20A-TP (Micro Commercial Co). These parts are interchangeable in applications where the 20V standoff voltage specification is required.

Manufacturer-Recommended Alternatives (Higher Voltage Ratings)

Parts with higher voltage ratings (SMBJ22A and SMBJ24A) are listed as manufacturer-recommended alternatives. These parts provide increased voltage protection margins but operate at different electrical specifications:

SMBJ22A: 22V standoff, 35.5V clamping
SMBJ24A: 24V standoff, 38.9V clamping

These alternatives are suitable only when circuit design permits operation at elevated voltage thresholds and when the application requires enhanced transient protection.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Power (W)	Temp Range (°C)	Package	Status
SMBJ20A-M3/5B	Vishay	20	22.2	32.4	18.5	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ20A-E3/52	Vishay	20	22.2	32.4	18.5	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ20A	Good-Ark Semiconductor	20	22.2	32.4	18.5	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ20A-13-F	Diodes Incorporated	20	22.2	32.4	18.5	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ20A-TP	Micro Commercial Co	20	22.2	32.4	18.5	600	-55 to 175	DO-214AA (SMB)	Active
SMBJ22A	Meritek	22	24.4	35.5	16.9	600	-55 to 150	DO-214AA (SMB)	Active
SMBJ24A	MDD	24	26.7	38.9	15.5	600	-50 to 150	DO-214AA (SMB)	Active

Engineering Selection Recommendations

For Direct Substitution (20V Standoff Voltage Applications)

SMBJ20A-E3/52, SMBJ20A (Good-Ark), SMBJ20A-13-F, and SMBJ20A-TP are electrically and mechanically equivalent to SMBJ20A-M3/5B. All are Active status, RoHS3 compliant, and carry MSL 1 (Unlimited) moisture sensitivity rating. Selection among these direct equivalents may be based on:

Inventory availability
Packaging format (Tape & Reel vs. Cut Tape & Digi-Reel)
Extended temperature range (SMBJ20A-TP supports -55 to 175°C vs. standard -55 to 150°C)
Lead time and supplier logistics

For Higher Voltage Protection (22V or 24V Standoff Voltage Applications)

SMBJ22A and SMBJ24A are manufacturer-recommended alternatives when circuit design permits operation at elevated voltage thresholds. These parts provide increased clamping voltage margins (35.5V and 38.9V respectively) and are suitable for applications requiring enhanced transient suppression. Both maintain RoHS3 compliance and MSL 1 rating. Peak pulse current is reduced proportionally (16.9A for SMBJ22A, 15.5A for SMBJ24A) due to higher voltage operation within the same 600W power envelope.

Frequently Asked Questions (FAQ)

Q: Can SMBJ20A-TP replace SMBJ20A-M3/5B in all applications?

A: Yes, SMBJ20A-TP is a direct electrical equivalent with identical voltage and current ratings. The extended operating temperature range (-55 to 175°C vs. -55 to 150°C) provides additional thermal margin. Both parts use the same DO-214AA (SMB) package and are surface-mount compatible.

Q: What is the difference between SMBJ20A-E3/52 and SMBJ20A-M3/5B?

A: Both parts are manufactured by Vishay and share identical electrical specifications (20V standoff, 32.4V clamping, 18.5A peak pulse current). The suffix designations (E3/52 vs. M3/5B) indicate different packaging tape configurations and manufacturing batches. Electrical performance and mechanical compatibility are equivalent.

Q: Can SMBJ22A or SMBJ24A be used as drop-in replacements?

A: SMBJ22A and SMBJ24A are not drop-in replacements for SMBJ20A-M3/5B. These parts operate at higher voltage thresholds (22V and 24V standoff respectively) and will trigger transient suppression at higher voltage levels. Use these alternatives only when circuit design explicitly requires higher voltage protection margins.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SMBJ20A-E3/52, SMBJ20A, SMBJ20A-13-F, SMBJ20A-TP, SMBJ22A, and SMBJ24A) are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating.

Q: What packaging options are available for SMBJ20A equivalents?

A: Direct equivalents are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel formats. SMBJ20A-E3/52, SMBJ20A-13-F, and SMBJ20A-TP are supplied in Tape & Reel. SMBJ20A (Good-Ark) is available in both Cut Tape & Digi-Reel and Tape & Reel formats. Verify packaging format with supplier documentation before procurement.

Q: Do all substitute parts use the same DO-214AA (SMB) package?

A: Yes. All listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and footprint compatibility with SMBJ20A-M3/5B.

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