SMLJ78AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ78AE3/TR13 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology. This component is rated for 78V reverse standoff with a 126V maximum clamping voltage and 22.8A peak pulse current. The device is housed in a DO-214AB surface mount package and is designed for general-purpose transient suppression applications. As an active product with full RoHS3 compliance and unlimited moisture sensitivity rating, equivalent and substitute parts are available from multiple manufacturers offering comparable electrical characteristics and thermal performance across varying power dissipation ratings.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	78	V
Voltage - Breakdown (Min)	86.7	V
Voltage - Clamping (Max) @ Ipp	126	V
Current - Peak Pulse (10/1000µs)	22.8	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C
Package Type	DO-214AB, SMC	Surface Mount
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ78AE3/TR13 are grouped based on electrical parameter compatibility. All substitute parts maintain the same voltage ratings: 78V reverse standoff, 86.7V minimum breakdown voltage, and 126V maximum clamping voltage. The primary differentiator among substitutes is the peak pulse current rating and corresponding power dissipation capability. Substitutes are categorized into three groups:

Direct Equivalents (300W–3kW class): Parts with peak pulse current between 22.8A and 23.9A, suitable for direct replacement with identical power handling.
Higher Capacity Variants (5kW class): Parts rated for 39.7A peak pulse current, providing increased transient suppression capability.
Standard Ratings (1.5kW class): Parts rated for 11.4A to 11.9A peak pulse current, suitable for lower-stress applications.

All substitute parts share the same surface mount packaging (DO-214AB/SMC), mounting type, and compliance certifications (ROHS3, REACH Unaffected, EAR99).

Parameter Comparison

Manufacturer Part Number	Manufacturer	V_Standoff (V)	V_Breakdown Min (V)	V_Clamp Max (V)	I_Peak (A)	Power (W)	T_Operating (°C)	RoHS3
SMLJ78AE3/TR13	Microchip Technology	78	86.7	126	22.8	300	-55 to 150	Yes
3SMC78A TR13 PBFREE	Central Semiconductor Corp	78	86.7	126	22.8	3000	-65 to 150	Yes
5.0SMDJ78A	Taiwan Semiconductor Corporation	78	86.7	126	39.7	5000	-55 to 175	Yes
5.0SMDJ78A-T7	Littelfuse Inc.	78	86.7	126	39.7	5000	-65 to 150	Yes
SMCJ78A	MDD	78	86.7	126	11.9	1500	-50 to 150	Yes
SMCJ78A-13-F	Diodes Incorporated	78	86.7	126	11.4	1500	-55 to 150	Yes
SMCJ78A-TP	Micro Commercial Co	78	86.7	126	11.9	1500	-55 to 175	Yes
SMDJ78A	Alpha & Omega Semiconductor Inc.	78	86.7	126	23.9	3000	-55 to 150	Yes

Engineering Selection Recommendations

All listed substitute parts are active products with full RoHS3 compliance, REACH Unaffected status, and EAR99 export classification, maintaining regulatory equivalence with the SMLJ78AE3/TR13. Selection among substitutes depends on application-specific transient current requirements and thermal design constraints:

For direct replacement at identical power dissipation: The SMDJ78A (Alpha & Omega Semiconductor Inc.) and 3SMC78A TR13 PBFREE (Central Semiconductor Corp) provide 3000W rated power dissipation with 22.8A to 23.9A peak pulse current, matching or exceeding the original specification.

For extended temperature range applications: The 5.0SMDJ78A (Taiwan Semiconductor Corporation) and SMCJ78A-TP (Micro Commercial Co) support upper operating temperatures of 175°C, compared to 150°C for the base part.

For lower transient stress environments: The SMCJ78A variants (MDD, Diodes Incorporated, Micro Commercial Co) rated at 1500W and 11.4–11.9A are suitable where suppression requirements are less demanding.

For maximum transient capacity: The 5.0SMDJ78A-T7 (Littelfuse Inc.) and 5.0SMDJ78A (Taiwan Semiconductor Corporation) offer 5000W peak power dissipation with 39.7A peak pulse current for high-stress transient environments.

All parts maintain DO-214AB/SMC surface mount packaging compatibility and can be used as direct drop-in replacements within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the SMCJ78A-TP replace the SMLJ78AE3/TR13 directly? A: The SMCJ78A-TP maintains all critical voltage parameters (78V standoff, 126V clamp) and surface mount packaging (DO-214AB/SMC). The 11.9A peak pulse rating and 1500W power dissipation are lower than the original 22.8A and 300W specification. Direct replacement is permissible only if the application's transient current requirements do not exceed 11.9A peak pulse.

Q: What is the difference between the 3SMC78A TR13 PBFREE and SMDJ78A substitutes? A: Both provide equivalent 78V/126V voltage ratings and 22.8–23.9A peak pulse current. The 3SMC78A TR13 PBFREE features a wider operating temperature range (-65°C to 150°C) compared to SMDJ78A (-55°C to 150°C). Power dissipation ratings are 3000W for both parts. Selection depends on low-temperature operational requirements.

Q: Are the 5.0SMDJ78A variants compatible with the original application? A: The 5.0SMDJ78A variants (both Taiwan Semiconductor Corporation and Littelfuse Inc.) maintain voltage equivalence and support higher peak pulse currents (39.7A) and power dissipation (5000W). These parts are suitable for replacement when transient stress is anticipated to exceed the original 22.8A specification. Both share DO-214AB/SMC packaging compatibility.

Q: Do all substitute parts have the same moisture sensitivity rating? A: Most substitute parts specify MSL Level 1 (Unlimited), matching the SMLJ78AE3/TR13. The SMDJ78A (Alpha & Omega Semiconductor Inc.) does not specify MSL in the provided data. Verify MSL requirements based on storage and assembly conditions before selection.

Q: Which substitute offers the best thermal performance at high ambient temperatures? A: The 5.0SMDJ78A (Taiwan Semiconductor Corporation) and SMCJ78A-TP (Micro Commercial Co) both support a maximum junction temperature of 175°C, compared to 150°C for the original part and most other substitutes. Selection between these two depends on peak pulse current requirements: 39.7A for the 5.0SMDJ78A or 11.9A for SMCJ78A-TP.

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