SMBJ24C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ24C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 24V reverse standoff voltage with a 40.85V maximum clamping voltage and 15.5A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ24C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, power dissipation, and package form factor while meeting current product availability and compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	25.29	V
Voltage - Clamping (Max) @ Ipp	40.85	V
Current - Peak Pulse (10/1000µs)	15.5	A
Power - Peak Pulse	600	W
Bidirectional Channels	1	—
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ24C is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 24V (nominal)
Breakdown voltage minimum: 25.29V or higher
Clamping voltage maximum: 40.85V or lower (tighter clamping preferred for protection margin)
Peak pulse current: 15.5A or higher
Peak pulse power: 600W or higher
Bidirectional channels: 1
Package: DO-214AA / SMB form factor
Mounting type: Surface mount
RoHS3 compliance required

Acceptable Parameter Variations:

Clamping voltage up to 43V is acceptable (represents ±5% tolerance band typical for TVS diodes)
Peak pulse current 14A to 15.5A is acceptable (represents manufacturing tolerance)
Operating temperature range may extend beyond -65 to 150°C
Automotive-grade qualification (AEC-Q101) is compatible but not required

Substitute parts are grouped by electrical performance tier: parts with 38.9V clamping voltage (tighter protection), parts with 43V clamping voltage (standard protection), and the manufacturer-recommended automotive-qualified option.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status	RoHS Status
SMBJ24C	Littelfuse Inc.	24	25.29	40.85	15.5	600	-65 to 150	Obsolete	ROHS3 Compliant
SMBJ24CA	MDD	24	26.7	38.9	15.5	600	-50 to 150	Active	ROHS3 Compliant
SZ1SMB24CAT3G	onsemi	24	26.7	38.9	15.4	600	-65 to 150	Active	ROHS3 Compliant
SMBJ24C	Taiwan Semiconductor Corporation	24	26.7	43	14.6	600	-55 to 150	Active	ROHS3 Compliant
TV06B240JB-G	Comchip Technology	24	26.7	38.9	15.42	600	Not specified	Active	ROHS3 Compliant
TV06B240JB-HF	Comchip Technology	24	26.7	38.9	15.42	600	Not specified	Active	ROHS3 Compliant
SMBJ24CAE3/TR13	Microchip Technology	24	26.7	38.9	15.4	600	-65 to 150	Active	ROHS3 Compliant
SMBJ24CE3/TR13	Microchip Technology	24	26.7	43	14	600	-65 to 150	Active	ROHS3 Compliant
1SMB24CA TR13 PBFREE	Central Semiconductor Corp	24	26.7	38.9	15.4	600	-65 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred): SMBJ24CA (MDD) and SMBJ24CAE3/TR13 (Microchip Technology) are the primary substitutes. Both maintain the 24V standoff voltage, 38.9V clamping voltage, and 15.5A peak pulse current. SMBJ24CAE3/TR13 offers extended operating temperature range (-65 to 150°C) matching the original specification and is available in tape & reel packaging. SMBJ24CA is available in higher inventory volume (210,110 pcs) with active product status.

Tier 2 - Automotive-Qualified Alternative: SZ1SMB24CAT3G (onsemi) is manufacturer-recommended and carries AEC-Q101 automotive qualification with full operating temperature range (-65 to 150°C). This part is suitable for applications requiring automotive-grade reliability and traceability.

Tier 3 - Alternative Clamping Voltage: SMBJ24CE3/TR13 (Microchip Technology) and SMBJ24C (Taiwan Semiconductor Corporation) feature 43V clamping voltage, representing the upper tolerance band. These are suitable when slightly higher clamping voltage is acceptable within system design margins.

Tier 4 - Cross-Manufacturer Options: TV06B240JB-G and TV06B240JB-HF (Comchip Technology) provide 38.9V clamping with 15.42A peak pulse current in DO-214AA package. Both are active products with ROHS3 compliance and tape & reel packaging.

All substitute parts maintain DO-214AA (SMB) package compatibility, 600W peak pulse power rating, and ROHS3 compliance. Selection should prioritize active product status and inventory availability for production continuity.

Frequently Asked Questions (FAQ)

Q: Can SMBJ24CA directly replace SMBJ24C in existing designs? A: Yes. SMBJ24CA maintains identical reverse standoff voltage (24V), peak pulse current (15.5A), and power rating (600W). The clamping voltage is 38.9V versus 40.85V, providing tighter overvoltage protection. Both use DO-214AA package. Electrical compatibility is confirmed.

Q: What is the difference between 38.9V and 43V clamping voltage options? A: The 38.9V clamping variants (SMBJ24CA, SZ1SMB24CAT3G, SMBJ24CAE3/TR13, TV06B240JB series, 1SMB24CA TR13 PBFREE) provide tighter voltage clamping for enhanced protection. The 43V variants (SMBJ24CE3/TR13, SMBJ24C from Taiwan Semiconductor) represent standard tolerance. Selection depends on system overvoltage margin requirements. Both are within acceptable substitution parameters.

Q: Is automotive qualification required for general-purpose applications? A: No. Automotive qualification (AEC-Q101) is not required for general-purpose applications. SZ1SMB24CAT3G offers this certification as an option for applications requiring automotive-grade traceability and reliability documentation. Non-automotive alternatives are fully compliant for standard industrial and consumer applications.

Q: Are there package differences between substitute parts? A: All substitute parts use DO-214AA (SMB) surface-mount package. Packaging format varies: some are supplied in tape & reel (TR), others in bulk. Tape & reel packaging is standard for automated assembly. Verify packaging format with supplier based on assembly requirements.

Q: What is the operating temperature range consideration? A: The original SMBJ24C specifies -65 to 150°C. Most substitutes maintain this range. SMBJ24CA specifies -50 to 150°C (narrower low-temperature range). For applications requiring full -65°C operation, select SMBJ24CAE3/TR13, SZ1SMB24CAT3G, SMBJ24CE3/TR13, or 1SMB24CA TR13 PBFREE.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original SMBJ24C specification.

Q: What inventory considerations apply? A: SMBJ24CA (MDD) offers the highest inventory availability at 210,110 pcs. 1SMB24CA TR13 PBFREE (Central Semiconductor Corp) provides 5,011 pcs. Other alternatives range from 670 to 2,109 pcs. Verify current stock with suppliers for production planning.

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