SMBJ78CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ78CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a reverse standoff voltage of 78V and provides clamping protection at 139V maximum. The component is housed in a DO-214AA (SMB) package and is supplied in tape and reel format for automated assembly.

The SMBJ78CE3/TR13 maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and regulatory compliance to support component procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	78	V
Voltage - Breakdown (Min)	86.7	V
Voltage - Clamping (Max) @ Ipp	139	V
Current - Peak Pulse (10/1000µs)	4.3	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ78CE3/TR13 are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse standoff voltage: 78V (typical)
Breakdown voltage minimum: 86.7V
Package type: DO-214AA (SMB) surface mount
Bidirectional Zener diode configuration
Peak pulse power rating: 600W
RoHS3 compliance and MSL 1 rating

Allowable Variation Parameters:

Voltage clamping maximum: 126V to 139V range
Peak pulse current: 4.3A to 4.76A range
Operating temperature minimum: -55°C to -65°C

Substitute parts maintain identical reverse standoff and breakdown voltage specifications while operating within the same power dissipation envelope. Clamping voltage variations within the specified range do not affect circuit protection function in general-purpose applications. Peak pulse current ratings above the minimum specification provide equivalent or enhanced transient suppression capability.

Parameter Comparison

Parameter	SMBJ78CE3/TR13 (Microchip)	SMBJ78CA (Meritek)	SMBJ78CA-13-F (Diodes Inc.)
Manufacturer	Microchip Technology	Meritek	Diodes Incorporated
Voltage - Reverse Standoff (Typ)	78V	78V	78V
Voltage - Breakdown (Min)	86.7V	86.7V	86.7V
Voltage - Clamping (Max) @ Ipp	139V	126V	126V
Current - Peak Pulse (10/1000µs)	4.3A	4.76A	4.7A
Power - Peak Pulse	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA (SMB)	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 150°C
Type	Zener	Zener	Zener
Bidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SMBJ78CA (Meritek)

The SMBJ78CA maintains full electrical equivalence with the SMBJ78CE3/TR13 across all critical protection parameters. Both devices share identical reverse standoff voltage (78V) and breakdown voltage (86.7V minimum). The clamping voltage of 126V on the Meritek part is lower than the Microchip specification of 139V, providing tighter voltage regulation during transient events. Peak pulse current rating of 4.76A exceeds the 4.3A specification of the primary part, delivering enhanced surge handling capability within the same 600W power envelope. The Meritek device is RoHS3 compliant with MSL 1 rating and maintains REACH unaffected status. Operating temperature range extends to -55°C minimum, which is acceptable for applications not requiring the -65°C lower limit of the Microchip part. This substitute is suitable for general-purpose transient suppression where tighter clamping voltage control is beneficial.

SMBJ78CA-13-F (Diodes Incorporated)

The SMBJ78CA-13-F from Diodes Incorporated provides direct functional equivalence to the SMBJ78CE3/TR13 with matching reverse standoff and breakdown voltage specifications. Clamping voltage is specified at 126V maximum, identical to the Meritek alternative, with peak pulse current of 4.7A. The Diodes Incorporated device maintains 600W peak pulse power rating and is housed in the DO-214AA SMB package with surface-mount configuration. Full RoHS3 compliance, MSL 1 rating, and REACH unaffected status are confirmed. Operating temperature range of -55°C to 150°C is equivalent to the Meritek part. This substitute is qualified for direct replacement in general-purpose TVS applications with equivalent protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can SMBJ78CA or SMBJ78CA-13-F be used as direct replacements for SMBJ78CE3/TR13?

A: Yes. Both substitute parts maintain identical reverse standoff voltage (78V) and breakdown voltage (86.7V minimum), which are the primary electrical parameters determining TVS diode function. Both are housed in DO-214AA SMB packages with surface-mount configuration and are RoHS3 compliant with MSL 1 rating. Electrical performance is equivalent for general-purpose transient suppression applications.

Q: What is the difference in clamping voltage between the main part and substitutes?

A: The SMBJ78CE3/TR13 specifies maximum clamping voltage of 139V at peak pulse current. Both substitute parts (SMBJ78CA and SMBJ78CA-13-F) specify 126V maximum clamping voltage. Lower clamping voltage provides tighter voltage regulation during transient suppression, which is acceptable and often beneficial in circuit protection design.

Q: Are there temperature range differences between these parts?

A: The SMBJ78CE3/TR13 operates from -65°C to 150°C. Both substitute parts operate from -55°C to 150°C. The substitute parts have a higher minimum operating temperature by 10°C. Applications requiring operation below -55°C must use the primary Microchip part.

Q: Do all three parts have the same package and mounting type?

A: Yes. All three parts use the DO-214AA (SMB) package in surface-mount configuration. Tape and reel packaging is available for all variants, supporting automated assembly processes without modification to board-level designs.

Q: What is the peak pulse current difference, and does it affect substitution?

A: The SMBJ78CE3/TR13 is rated for 4.3A peak pulse current. The SMBJ78CA is rated for 4.76A, and the SMBJ78CA-13-F is rated for 4.7A. Higher peak pulse current ratings on substitute parts indicate enhanced transient handling capability within the same 600W power dissipation limit. This difference does not prevent substitution; it provides equivalent or improved performance.

Q: Are all parts RoHS3 compliant and REACH unaffected?

A: Yes. The SMBJ78CE3/TR13, SMBJ78CA, and SMBJ78CA-13-F are all RoHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating and REACH unaffected status. All parts meet current environmental and regulatory requirements for electronic component procurement.

Q: Which substitute part should be selected for new designs?

A: Selection between SMBJ78CA and SMBJ78CA-13-F depends on supplier availability and procurement lead time. Both parts provide equivalent electrical performance and regulatory compliance. The SMBJ78CA-13-F from Diodes Incorporated is recommended where supply chain continuity with a major manufacturer is prioritized. The SMBJ78CA from Meritek is suitable where cost optimization or alternative sourcing is required.

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