SMBJ17 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ17 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 17V reverse standoff voltage with a 28.98V maximum clamping voltage at peak pulse current of 21.8A, housed in a DO-214AA (SMB) package. The SMBJ17 is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	17.91	V
Voltage - Clamping (Max) @ Ipp	28.98	V
Current - Peak Pulse (10/1000µs)	21.8	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ17 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 17V
Voltage - Clamping (Max) @ Ipp: Maximum 28.98V
Current - Peak Pulse (10/1000µs): Minimum 21.7A
Power - Peak Pulse: 600W
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)
Series: SMBJ

All substitute parts listed maintain these electrical specifications within the defined tolerances and are housed in identical or functionally equivalent surface-mount packages. Substitute parts must support the operating temperature range and maintain RoHS3 compliance or equivalent environmental standards.

Parameter Comparison

Parameter	SMBJ17 (Littelfuse)	SMBJ17A (Meritek)	SMBJ17A-13-F (Diodes Inc.)	SMBJ17A/54 (Vishay)
Voltage - Reverse Standoff (Typ)	17V	17V	17V	17V
Voltage - Breakdown (Min)	17.91V	18.9V	18.9V	18.9V
Voltage - Clamping (Max) @ Ipp	28.98V	27.6V	27.6V	27.6V
Current - Peak Pulse (10/1000µs)	21.8A	21.74A	21.7A	21.7A
Power - Peak Pulse	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	DO-214AA, SMB	DO-214AA (SMB)	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts (SMBJ17A from Meritek, SMBJ17A-13-F from Diodes Incorporated, and SMBJ17A/54 from Vishay) are electrically compatible with the SMBJ17 across the critical voltage and current parameters. The primary differentiators are product status and regulatory compliance.

SMBJ17A (Meritek) and SMBJ17A-13-F (Diodes Incorporated) are both active products with ROHS3 compliance, making them suitable for new designs and applications requiring current environmental certifications. SMBJ17A-13-F is supplied in Tape & Reel packaging, which is standard for automated assembly processes.

SMBJ17A/54 (Vishay) is an active product but carries RoHS non-compliant status. This part is suitable only for applications where RoHS compliance is not a requirement or where legacy system maintenance permits non-compliant components.

The operating temperature range of substitute parts (-55 to 150°C) is narrower than the original SMBJ17 (-65 to 150°C). Applications requiring operation below -55°C must retain the original part or identify alternatives with extended low-temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ17A parts from different manufacturers be used interchangeably?

A: Yes. SMBJ17A from Meritek and SMBJ17A-13-F from Diodes Incorporated meet the same electrical specifications (17V standoff, 27.6V clamping, 21.7A peak pulse current) and are housed in identical DO-214AA (SMB) packages. Both are active products with ROHS3 compliance. Selection between manufacturers may be based on availability, lead time, or supply chain requirements.

Q: What is the difference between SMBJ17A and SMBJ17A/54?

A: Both parts share identical electrical specifications and package type. The primary difference is regulatory compliance: SMBJ17A (Meritek and Diodes) are ROHS3 compliant, while SMBJ17A/54 (Vishay) is RoHS non-compliant. Selection depends on whether the application or end-market requires RoHS certification.

Q: Why does the SMBJ17A have a lower clamping voltage (27.6V) than the original SMBJ17 (28.98V)?

A: The clamping voltage difference reflects manufacturing variations within the SMBJ series tolerance band. Both values fall within acceptable operating parameters for the 17V standoff voltage class. Circuit designs must accommodate the specified maximum clamping voltage of each part.

Q: Is the SMBJ17A-13-F suitable for automated assembly?

A: Yes. SMBJ17A-13-F is supplied in Tape & Reel (TR) packaging, which is standard for pick-and-place and automated surface-mount assembly processes.

Q: Can I use SMBJ17A in applications requiring operation below -55°C?

A: No. The SMBJ17A operating temperature range is -55 to 150°C. Applications requiring operation at -65°C must use the original SMBJ17 or identify alternative parts with extended low-temperature specifications.

Q: Are all substitute parts in stock?

A: Availability varies by manufacturer and distributor. SMBJ17A (Meritek) has 15,419 units in stock. SMBJ17A-13-F (Diodes Incorporated) has 1,953 units in stock. SMBJ17A/54 (Vishay) has 1,100 units in stock. Verify current inventory with your component supplier.

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