SMLJ78CE3/TR13 Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMLJ78CE3/TR13 is a surface-mount transient voltage suppressor (TVS) diode manufactured by Microchip Technology, classified as a Zener-type bidirectional TVS device in the DO-214AB (SMC) package. This component is designed for general-purpose transient voltage suppression applications and is currently in active product status with 904 units in stock.

TVS diodes protect sensitive electronic circuits from voltage transients and electrostatic discharge (ESD) events. When equivalent or substitute parts are required due to inventory constraints, design modifications, or supply chain considerations, alternative components must maintain electrical compatibility within the specified parameter ranges while meeting the same environmental and compliance standards.

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)	21.6	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMLJ78CE3/TR13 is determined by strict electrical and mechanical compatibility criteria. The following parameters must align across all candidate substitute parts:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 78V
Voltage - Breakdown (Min): 86.7V
Package / Case: DO-214AB, SMC (surface-mount form factor)
Mounting Type: Surface Mount
Type: Zener (bidirectional)
Bidirectional Channels: 1

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: Substitute parts may clamp at lower voltages (126V acceptable vs. 139V for main part)
Current - Peak Pulse (10/1000µs): Substitute parts may have higher current ratings (11.4A to 39.7A acceptable)
Power - Peak Pulse: Substitute parts may have higher power ratings (1.5kW to 5kW acceptable)
Operating Temperature Range: Substitute parts must support at least -55°C to 150°C; extended ranges acceptable

Compliance Requirements:

RoHS3 Compliant (mandatory)
Moisture Sensitivity Level (MSL): 1 (Unlimited) preferred
ECCN: EAR99 (where specified)
HTSUS: 8541.10.0080 (where specified)

All identified substitute parts meet these criteria and are classified as direct functional equivalents for the SMLJ78CE3/TR13.

Parameter Comparison

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)	Package	Inventory (Pcs)
SMLJ78CE3/TR13	Microchip Technology	78	86.7	139	21.6	300	-55 to 150	DO-214AB, SMC	904
5.0SMDJ78CA	MDE Semiconductor Inc	78	86.7	126	39.7	5000	-55 to 150	DO-214AB, SMC	2300
SMCJ78CA	MDD	78	86.7	126	11.9	1500	-50 to 150	DO-214AB, SMC	2675
SMCJ78CA-13-F	Diodes Incorporated	78	86.7	126	11.4	1500	-55 to 150	DO-214AB, SMC	1089
SMDJ78CA	Alpha & Omega Semiconductor Inc.	78	86.7	126	23.9	3000	-55 to 150	DO-214AB, SMC	713
SMDJ78CA-T7	Littelfuse Inc.	78	86.7	126	23.8	3000	-65 to 150	DO-214AB, SMC	1398
SMLJ78CA	Bourns Inc.	78	86.7	126	22.8	3000	-55 to 150	DO-214AB, SMC	13454

Engineering Selection Recommendations

Primary Selection Criteria:

Inventory Availability: SMLJ78CA (Bourns Inc.) offers the highest inventory level at 13,454 units, providing maximum supply security for high-volume applications.
Compliance Status: All substitute parts are ROHS3 compliant. SMDJ78CA-T7 (Littelfuse Inc.) extends the lower operating temperature to -65°C, providing enhanced cold-temperature performance compared to the main part's -55°C minimum.
Power Dissipation Margin: Substitute parts with higher power ratings (3kW to 5kW) provide additional thermal margin compared to the main part's 300W rating. SMLJ78CA, SMDJ78CA, and SMDJ78CA-T7 all offer 3kW capability. The 5.0SMDJ78CA provides maximum margin at 5kW.
Voltage Clamping Performance: All substitute parts clamp at 126V maximum, which is lower than the main part's 139V. This represents improved transient suppression performance and is acceptable for general-purpose applications where lower clamping voltage is beneficial.
Current Handling: Substitute parts range from 11.4A to 39.7A peak pulse current. Selection should be based on circuit transient current requirements. The main part's 21.6A rating is matched or exceeded by SMDJ78CA (23.9A), SMDJ78CA-T7 (23.8A), and SMLJ78CA (22.8A).

Recommended Substitutes by Application Priority:

High-volume production: SMLJ78CA (Bourns Inc.) — maximum inventory, proven compliance, 3kW power rating
Extended temperature range: SMDJ78CA-T7 (Littelfuse Inc.) — -65°C to 150°C operating range
Maximum power margin: 5.0SMDJ78CA (MDE Semiconductor Inc.) — 5kW peak pulse power
Cost-optimized: SMCJ78CA (MDD) — lower current rating (11.9A) suitable for lower-transient applications

Frequently Asked Questions (FAQ)

Q1: Can SMCJ78CA substitute for SMLJ78CE3/TR13 in all applications?

A: SMCJ78CA is electrically compatible based on matching voltage parameters (78V standoff, 86.7V breakdown, 126V clamping). However, its peak pulse current rating is 11.9A compared to the main part's 21.6A. Substitution is valid only if circuit transient currents do not exceed 11.9A. Verify transient current specifications before selection.

Q2: What is the significance of the lower clamping voltage (126V vs. 139V) in substitute parts?

A: Lower clamping voltage indicates the TVS diode suppresses transients to a lower peak voltage. This is a performance advantage, not a limitation. All substitute parts clamp at 126V, providing superior transient suppression compared to the main part's 139V clamping level. This is acceptable for general-purpose applications.

Q3: Are all substitute parts available in the same DO-214AB (SMC) package?

A: Yes. All identified substitute parts use the DO-214AB surface-mount package (also designated SMC). Physical dimensions and PCB footprints are identical, enabling direct board-level substitution without layout modifications.

Q4: Which substitute part offers the best inventory availability?

A: SMLJ78CA (Bourns Inc.) provides 13,454 units in stock, representing the highest availability among all substitute options. This part is recommended for applications requiring immediate or high-volume procurement.

Q5: Do substitute parts meet the same RoHS and environmental compliance standards?

A: Yes. All substitute parts are ROHS3 compliant with Moisture Sensitivity Level (MSL) 1 (Unlimited), matching the main part's compliance profile. ECCN and HTSUS classifications are consistent across all options where specified.

Q6: Can SMDJ78CA-T7 be used in applications requiring -55°C minimum operating temperature?

A: Yes. SMDJ78CA-T7 extends the lower operating temperature to -65°C, which exceeds the -55°C requirement of the main part. This part is fully compatible and provides enhanced cold-temperature performance margin.

Q7: What is the difference between SMDJ78CA and SMDJ78CA-T7?

A: Both parts are manufactured by Littelfuse Inc. with identical electrical specifications (78V standoff, 126V clamping, 23.8A peak pulse, 3kW power). The primary difference is operating temperature range: SMDJ78CA-T7 supports -65°C to 150°C, while standard SMDJ78CA supports -55°C to 150°C. Selection depends on minimum operating temperature requirements.

Q8: Is the 5.0SMDJ78CA suitable for all applications requiring SMLJ78CE3/TR13?

A: The 5.0SMDJ78CA is electrically compatible with matching voltage parameters and identical package. Its 39.7A peak pulse current and 5kW power rating exceed the main part's specifications, providing maximum performance margin. It is suitable for all applications and offers the highest transient current handling capability among all substitutes.

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