SMLJ85E3/TR13 Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The SMLJ85E3/TR13 is a unidirectional transient voltage suppressor diode manufactured by Microchip Technology, rated at 85V reverse standoff voltage with 151V clamping voltage and 19.8A peak pulse current. The device is classified as Active status and suitable for general purpose transient protection applications. Finding equivalent or substitute parts becomes necessary when addressing supply chain constraints, lead time requirements, inventory optimization, or design flexibility across multiple manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Specification
Voltage - Reverse Standoff (Typ)	85V
Voltage - Breakdown (Min)	94.4V
Voltage - Clamping (Max) @ Ipp	151V
Current - Peak Pulse (10/1000µs)	19.8A
Power - Peak Pulse	300W
Package / Case	DO-214AB, SMC
Type	Zener
Unidirectional Channels	1
Operating Temperature (TJ)	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SMLJ85E3/TR13 are evaluated based on strict electrical and mechanical compatibility criteria. All qualified substitutes must meet the following requirements:

Fixed Parameters (Non-Negotiable):

Voltage - Reverse Standoff: 85V (±tolerance)
Voltage - Breakdown (Min): 94.4V
Package / Case: DO-214AB, SMC
Type: Unidirectional Zener
Channels: 1

Variable Parameters (Within Acceptable Range):

Voltage - Clamping (Max) @ Ipp: 137V to 151V
Current - Peak Pulse: 10.4A to 36.5A
Power - Peak Pulse: 1.5kW to 5kW
Operating Temperature: -50°C to -65°C minimum, 150°C to 175°C maximum
Manufacturers: Multiple qualified sources

All substitute parts listed maintain identical voltage standoff and breakdown specifications while offering alternative clamping voltages, peak pulse ratings, and thermal ranges to accommodate various circuit design requirements.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	VBR (Min) (V)	VC Max (V)	Ipp (A)	Power (W)	Temp Range (°C)	Package
SMLJ85E3/TR13	Microchip Technology	85	94.4	151	19.8	300	-55 ~ 150	DO-214AB
5.0SMDJ85A	Taiwan Semiconductor Corporation	85	94.4	137	36.5	5000	-55 ~ 175	DO-214AB
5.0SMDJ85A-T7	Littelfuse	85	94.4	137	36.5	5000	-65 ~ 150	DO-214AB
SMCJ85A	MDD	85	94.4	137	11	1500	-50 ~ 150	DO-214AB
SMCJ85A-13-F	Diodes Incorporated	85	94.4	137	10.4	1500	-55 ~ 150	DO-214AB
SMCJ85A-TP	Micro Commercial Co	85	94.4	137	11	1500	-55 ~ 175	DO-214AB
SMDJ85A	Alpha & Omega Semiconductor Inc.	85	94.4	137	21.9	3000	-55 ~ 150	DO-214AB
SMLJ85A	Bourns Inc.	85	94.4	137	20.8	3000	-55 ~ 150	DO-214AB
SMLJ85A-TP	Micro Commercial Co	85	94.4	137	20.8	3000	-55 ~ 175	DO-214AB

Engineering Selection Recommendations

High Compatibility Substitutes:

Parts with 137V clamping voltage (lower than the original 151V) offer superior transient energy absorption characteristics. These include 5.0SMDJ85A (Taiwan Semiconductor), 5.0SMDJ85A-T7 (Littelfuse), SMDJ85A (Alpha & Omega), and SMLJ85A series (Bourns, Micro Commercial). All maintain identical voltage standoff and breakdown parameters while providing higher peak pulse current ratings (10.4A to 36.5A) and extended operating temperature ranges to 175°C where specified.

Compliance and Certification:

All listed substitutes are ROHS3 compliant. SMLJ85A-TP and 5.0SMDJ85A provide extended upper operating temperature to 175°C, addressing thermal margin requirements in high-temperature applications. 5.0SMDJ85A-T7 extends the lower operating range to -65°C for extreme cold environments. Moisture sensitivity is uniformly rated at MSL 1 (Unlimited) across all qualified substitutes.

Selection Criteria:

Component selection should prioritize parts with peak pulse current ratings equal to or exceeding the circuit protection requirement. The original SMLJ85E3/TR13 at 19.8A peak pulse current aligns with SMLJ85A-TP, SMLJ85A, SMDJ85A, and Littelfuse 5.0SMDJ85A-T7. For applications requiring additional transient energy headroom, 5.0SMDJ85A and 5.0SMDJ85A-T7 provide maximum available current handling at 36.5A.

Frequently Asked Questions (FAQ)

Q: Can all listed parts be used interchangeably with the SMLJ85E3/TR13?

A: All listed substitutes share identical voltage standoff (85V) and breakdown (94.4V) specifications with DO-214AB package compatibility. However, clamping voltage varies between 137V and 151V. The original part clamps at 151V, while most substitutes clamp at 137V. This lower clamping voltage provides better transient suppression but may require circuit evaluation if the original design margin depended on the higher 151V clamp level.

Q: What is the significance of clamping voltage differences?

A: Clamping voltage determines the voltage peak that appears across the protected circuit during transient events. The SMLJ85E3/TR13 clamps at 151V maximum, while most substitutes clamp at 137V. Lower clamping voltage (137V) provides better protection but requires confirmation that downstream components tolerate this lower clamping point.

Q: Which substitute offers the highest transient energy absorption?

A: The 5.0SMDJ85A and 5.0SMDJ85A-T7 (both 5000W peak pulse power) offer the highest energy absorption capacity, followed by SMLJ85A and SMLJ85A-TP at 3000W. The original part rated at 300W has significantly lower energy capacity.

Q: Are temperature range differences critical for substitution?

A: Temperature range differences become critical only if the application operates near the boundaries. The original SMLJ85E3/TR13 operates -55°C to 150°C. Extended upper range to 175°C (available on SMCJ85A-TP, SMLJ85A-TP, and 5.0SMDJ85A) provides margin for high-temperature environments. Extended lower range to -65°C (5.0SMDJ85A-T7) addresses cold-weather applications.

Q: Does REACH compliance affect substitution decisions?

A: SMLJ85A is identified as REACH Affected, while all other substitutes are REACH Unaffected. For applications subject to REACH regulations, REACH Unaffected parts such as SMLJ85A-TP, SMDJ85A, or the original SMLJ85E3/TR13 are preferred.

Q: Are there peak pulse current constraints for substitution?

A: Peak pulse current must be sufficient for the transient energy present in the protected circuit. The original 19.8A specification aligns with SMLJ85A, SMLJ85A-TP, and SMDJ85A. For circuits with higher transient energy, 5.0SMDJ85A or 5.0SMDJ85A-T7 at 36.5A provide additional headroom. The lower-rated SMCJ85A series (10.4A–11A) is suitable only for lower-energy transient environments.

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