SMBJ18CA-13 Equivalent & Substitute Parts

Part Overview

The SMBJ18CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features an 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 20.5A peak pulse current capability in the DO-214AA (SMB) package format.

The SMBJ18CA-13 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or comparable electrical specifications, enabling continued design support and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	18	V
Voltage - Breakdown (Min)	20	V
Voltage - Clamping (Max) @ Ipp	29.2	V
Current - Peak Pulse (10/1000µs)	20.5	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55°C ~ 150°C	TJ
Bidirectional Channels	1	—
Type	Zener	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ18CA-13 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 18V
Voltage - Breakdown (Min): 20V
Voltage - Clamping (Max) @ Ipp: 29.2V
Current - Peak Pulse (10/1000µs): 20.5A (±5% tolerance acceptable)
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener

All substitute parts listed maintain these core electrical specifications within acceptable engineering tolerances. Packaging and mounting compatibility are identical across all alternatives, ensuring direct board-level substitution without design modification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
SMBJ18CA-13	Diodes Incorporated	18V	20V	29.2V	20.5A	600W	-55°C ~ 150°C	Discontinued	RoHS non-compliant
SMBJ18CA-13-F	Diodes Incorporated	18V	20V	29.2V	20.5A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ18CA-TP	Micro Commercial Co	18V	20V	29.2V	20.5A	600W	-55°C ~ 175°C	Active	ROHS3 Compliant
SMBJ18CA	MDD	18V	20V	29.2V	20.6A	600W	-50°C ~ 150°C	Active	ROHS3 Compliant
SMBJ18CA-TR	STMicroelectronics	18V	20V	29.2V	21.5A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SZ1SMB18CAT3G	Littelfuse Inc.	18V	20V	29.2V	20.5A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

SMBJ18CA-13-F (Diodes Incorporated) — Direct replacement with identical electrical specifications and same manufacturer. Active product status with ROHS3 compliance. Recommended for designs requiring exact specification match and manufacturer continuity.

SMBJ18CA-TP (Micro Commercial Co) — Functionally equivalent with extended operating temperature range (-55°C ~ 175°C). ROHS3 compliant and actively produced. Suitable for applications requiring higher temperature margin.

SMBJ18CA (MDD) — Manufacturer-recommended substitute with marginally higher peak pulse current (20.6A). ROHS3 compliant with high inventory availability. Operating temperature range -50°C ~ 150°C. Acceptable for general-purpose applications within specified temperature limits.

SMBJ18CA-TR (STMicroelectronics) — TRANSIL™ series equivalent with slightly elevated peak pulse current (21.5A). ROHS3 compliant and actively produced. Identical operating temperature range to original part. Suitable for designs with moderate current margin requirements.

SZ1SMB18CAT3G (Littelfuse Inc.) — Automotive-grade TVS diode (AEC-Q101 qualified) with extended lower temperature limit (-65°C ~ 150°C). ROHS3 compliant. Recommended for automotive and harsh-environment applications requiring higher reliability qualification.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18CA-13 be directly replaced with SMBJ18CA-13-F?

A: Yes. Both parts share identical electrical specifications (18V standoff, 29.2V clamping, 20.5A peak pulse) and the same DO-214AA SMB package. SMBJ18CA-13-F is the active production equivalent with improved RoHS compliance.

Q: What is the difference between SMBJ18CA-TP and SMBJ18CA-13?

A: Electrical specifications are identical. SMBJ18CA-TP offers an extended operating temperature range of -55°C ~ 175°C compared to -55°C ~ 150°C for the original part, providing additional thermal margin in high-temperature environments.

Q: Is the MDD SMBJ18CA suitable as a substitute?

A: Yes, with minor parameter variance. Peak pulse current is 20.6A versus 20.5A (within acceptable tolerance). Operating temperature range is -50°C ~ 150°C. All other electrical and mechanical parameters are equivalent. Verify lower temperature limit compatibility with your application.

Q: Why does SZ1SMB18CAT3G have a different part number format?

A: SZ1SMB18CAT3G is a Littelfuse part number following their naming convention. The "T3G" suffix indicates automotive-grade qualification (AEC-Q101). Electrical specifications and package format remain compatible with the original SMBJ18CA-13.

Q: Can I use SMBJ18CA-TR as a drop-in replacement?

A: Yes. SMBJ18CA-TR is a STMicroelectronics TRANSIL™ series part with identical voltage specifications and package. Peak pulse current is 21.5A, providing additional current margin. No board-level modifications are required.

Q: Are all substitute parts RoHS compliant?

A: The original SMBJ18CA-13 is RoHS non-compliant. All listed substitute parts are ROHS3 compliant, meeting current environmental regulations. Verify RoHS compliance requirements for your application before selection.

Q: What packaging options are available for these substitutes?

A: All substitute parts use the DO-214AA (SMB) surface-mount package. Packaging formats vary by supplier (Tape & Reel, Cut Tape, or bulk). Confirm packaging format availability with your distributor based on production volume requirements.

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