SMBJ28C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ28C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. Housed in the DO-214AA (SMB) package, this component provides 28V reverse standoff voltage with a 47.67V maximum clamping voltage at peak pulse current of 13.3A.

The SMBJ28C is classified as obsolete. Equivalent and substitute parts listed below are active products that maintain electrical and mechanical compatibility within the specified parameter tolerances for this TVS diode category.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	29.48	V
Voltage - Clamping (Max) @ Ipp	47.67	V
Current - Peak Pulse (10/1000µs)	13.3	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ28C is determined by the following critical electrical parameters:

Voltage - Reverse Standoff (Typ): 28V
Voltage - Clamping (Max) @ Ipp: 45.4V to 45.5V (within acceptable tolerance)
Current - Peak Pulse (10/1000µs): 13.2A to 13.8A (within acceptable tolerance)
Power - Peak Pulse: 600W to 800W (equal or greater)
Package / Case: DO-214AA, SMB (identical)
Mounting Type: Surface Mount (identical)
RoHS Status: ROHS3 Compliant (equivalent compliance)
Moisture Sensitivity Level: 1 (Unlimited) (equivalent or better)

All substitute parts maintain the same 28V reverse standoff voltage and operate within the electrical performance envelope of the original SMBJ28C. Clamping voltage variations (45.4V to 45.5V versus 47.67V) and peak pulse current variations (13.2A to 13.8A versus 13.3A) remain within acceptable engineering tolerances for TVS diode applications.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ) [V]	Vbr (Min) [V]	Vc (Max) @ Ipp [V]	Ipp (10/1000µs) [A]	Ppk [W]	Package	Status
SMBJ28C	Littelfuse Inc.	28	29.48	47.67	13.3	600	DO-214AA (SMBJ)	Obsolete
SMBJ28CA	MDD	28	31.1	45.4	13.3	600	SMB/DO-214AA	Active
SZ1SMB28CAT3G	Littelfuse Inc.	28	31.1	45.4	13.2	600	SMB	Active
SMB8J28CA-E3/5B	Vishay General Semiconductor - Diodes Division	28	31.1	45.4	17.6	800	DO-214AA (SMB)	Active
SMBJ28CA-13-F	Diodes Incorporated	28	31.1	45.4	13.2	600	SMB	Active
SMBJ28CA-E3/5B	Vishay General Semiconductor - Diodes Division	28	31.1	45.5	13.2	600	DO-214AA (SMBJ)	Active
SMBJ28CA-TP	Micro Commercial Co	28	31.1	45.4	13.2	600	DO-214AA (SMB)	Active
SMBJ28CA-TR	STMicroelectronics	28	31.1	45.4	13.8	600	SMB (DO-214AA)	Active
TV06B280JB-G	Comchip Technology	28	31.1	45.4	13.22	600	DO-214AA (SMB)	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 (Unlimited) rating, matching the original SMBJ28C specifications. Selection among these alternatives should be based on:

Availability and Lead Time: MDD SMBJ28CA (26,400 pcs), STMicroelectronics SMBJ28CA-TR (27,900 pcs), and Littelfuse SZ1SMB28CAT3G (55,200 pcs) offer the highest inventory levels for immediate procurement.

Electrical Performance Margin: SMB8J28CA-E3/5B from Vishay provides enhanced peak pulse current capability (17.6A) and power dissipation (800W), offering additional design margin for applications requiring higher transient stress tolerance.

Temperature Range: Micro Commercial Co SMBJ28CA-TP supports extended operating temperature to 175°C, compared to the standard 150°C maximum of other alternatives, for applications in elevated thermal environments.

Automotive Qualification: Littelfuse SZ1SMB28CAT3G carries AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring automotive-grade component certification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SMBJ28C with any of these substitute parts?

A: Yes. All substitute parts maintain the same 28V reverse standoff voltage, DO-214AA (SMB) package, surface-mount configuration, and ROHS3 compliance. Electrical parameters (clamping voltage, peak pulse current, power dissipation) fall within acceptable engineering tolerances for TVS diode applications.

Q: What is the difference between clamping voltage values (47.67V vs. 45.4V)?

A: The SMBJ28C specifies a maximum clamping voltage of 47.67V, while substitute parts specify 45.4V to 45.5V. Both values represent the maximum voltage across the diode at peak pulse current. The lower clamping voltage in substitutes provides equivalent or improved overvoltage protection performance.

Q: Are there differences in peak pulse current ratings?

A: Peak pulse current ratings range from 13.2A to 17.6A across substitute parts, compared to 13.3A for the SMBJ28C. All values remain within acceptable tolerance for general-purpose TVS applications. SMB8J28CA-E3/5B offers higher current capability (17.6A) for applications requiring additional transient stress margin.

Q: Do all substitutes use the same DO-214AA package?

A: Yes. All substitute parts use the DO-214AA (SMB) package, ensuring mechanical and footprint compatibility with the original SMBJ28C design.

Q: Which substitute offers the best availability?

A: Littelfuse SZ1SMB28CAT3G provides the highest inventory (55,200 pcs), followed by STMicroelectronics SMBJ28CA-TR (27,900 pcs) and MDD SMBJ28CA (26,400 pcs).

Q: Is automotive qualification required for my application?

A: If your application requires automotive-grade components, select Littelfuse SZ1SMB28CAT3G, which carries AEC-Q101 qualification. Other substitutes are suitable for general industrial and commercial applications.

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