SMLJ85CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ85CE3/TR13 is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This surface-mount component operates in the DO-214AB (SMC) package and is classified as an active product with ROHS3 compliance. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within the same application category.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	85	V
Voltage - Breakdown (Min)	94.4	V
Voltage - Clamping (Max) @ Ipp	151	V
Current - Peak Pulse (10/1000µs)	19.8	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 SMLJ85CE3/TR13 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 85V
Voltage - Breakdown (Min): 94.4V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: Acceptable range 137V to 178V
Current - Peak Pulse (10/1000µs): Acceptable range 10.4A to 56A
Power - Peak Pulse: Acceptable range 1500W to 5000W
Operating Temperature Range: Minimum -55°C, maximum 150°C or higher

All identified substitute parts maintain the core 85V standoff voltage specification and DO-214AB package format. Variations in clamping voltage, peak pulse current, and power dissipation reflect different manufacturer designs within the same protection class. Parts are grouped by their ability to function in the same circuit topology without modification to PCB layout or thermal management.

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 Range (°C)	Package	RoHS Status
SMLJ85CE3/TR13	Microchip Technology	85	94.4	151	19.8	300	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
5.0SMDJ85CA	MDE Semiconductor Inc	85	94.4	137	36.5	5000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
5.0SMDJ85CA-T7	Littelfuse Inc.	85	94.4	137	36.5	5000	-65 to 150	DO-214AB, SMC	ROHS3 Compliant
5.0SMLJ85CA-TP	Micro Commercial Co	85	94.4	137	36.5	5000	-55 to 175	DO-214AB, SMC	ROHS3 Compliant
SMCJ85CA	Fairchild Semiconductor	85	94.4	137	11	1500	-55 to 150	DO-214AB, SMC	Not specified
SMCJ85CA-13-F	Diodes Incorporated	85	94.4	137	10.4	1500	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMCJ85CA-TR	STMicroelectronics	85	94	178	56	1500	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMDJ85CA	Alpha & Omega Semiconductor Inc.	85	94.4	137	21.9	3000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant
SMLJ85CA	Bourns Inc.	85	94.4	137	20.8	3000	-55 to 150	DO-214AB, SMC	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The SMLJ85CA (Bourns Inc.) and SMDJ85CA (Alpha & Omega Semiconductor Inc.) are direct functional equivalents to the SMLJ85CE3/TR13. Both maintain identical standoff voltage (85V), breakdown voltage (94.4V), operating temperature range (-55°C to 150°C), and package format (DO-214AB, SMC). These parts feature clamping voltages of 137V and peak pulse currents of 20.8A and 21.9A respectively, with 3000W peak pulse power ratings. Both are ROHS3 compliant with MSL 1 rating.

Extended Substitutes (Higher Power Capability):

The 5.0SMDJ85CA (MDE Semiconductor Inc.), 5.0SMDJ85CA-T7 (Littelfuse Inc.), and 5.0SMLJ85CA-TP (Micro Commercial Co) provide enhanced power dissipation at 5000W peak pulse with higher peak pulse currents (36.5A). These parts maintain the 85V standoff specification and DO-214AB package. The 5.0SMDJ85CA-T7 extends the lower operating temperature to -65°C, while 5.0SMLJ85CA-TP extends the upper temperature to 175°C. Selection of these parts is appropriate when circuit design requires higher transient energy absorption.

Alternative Substitutes (Lower Power Capability):

The SMCJ85CA (Fairchild Semiconductor) and SMCJ85CA-13-F (Diodes Incorporated) provide 1500W peak pulse power with lower peak pulse currents (11A and 10.4A respectively). These parts are suitable for applications with reduced transient energy requirements. SMCJ85CA-13-F is ROHS3 compliant; Fairchild SMCJ85CA compliance status is not specified in available data.

High-Current Alternative:

The SMCJ85CA-TR (STMicroelectronics) features the highest peak pulse current specification at 56A with a clamping voltage of 178V. This part is selected when maximum transient current handling is required. The elevated clamping voltage (178V versus 151V of the main part) must be evaluated against circuit protection thresholds.

All substitute parts listed maintain ROHS3 compliance and MSL 1 rating where specified, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute SMLJ85CA for SMLJ85CE3/TR13 without circuit modification?

A: Yes. Both parts share identical standoff voltage (85V), breakdown voltage (94.4V), operating temperature range (-55°C to 150°C), and DO-214AB package format. The SMLJ85CA features a clamping voltage of 137V compared to 151V in the original part, and peak pulse current of 20.8A versus 19.8A. These differences fall within acceptable substitution parameters for general-purpose TVS applications. No PCB layout or thermal management changes are required.

Q: What is the difference between the 300W SMLJ85CE3/TR13 and the 5000W 5.0SMDJ85CA?

A: The power rating difference reflects the peak pulse power dissipation capability during transient events. The 5.0SMDJ85CA can absorb significantly higher transient energy (5000W versus 300W) due to its higher peak pulse current rating (36.5A versus 19.8A). Selection depends on the expected transient energy in the protected circuit. If transient events exceed 300W, the higher-power alternative is required. If transient energy is below 300W, either part functions correctly.

Q: Are all substitute parts in the same DO-214AB package?

A: Yes. All substitute parts listed are packaged in DO-214AB (SMC) format, ensuring identical PCB footprint and mounting compatibility. No layout redesign is necessary when substituting between these parts.

Q: What does the clamping voltage difference mean for circuit protection?

A: Clamping voltage is the maximum voltage across the TVS diode during a transient event at peak pulse current. The SMLJ85CE3/TR13 clamps at 151V maximum, while most substitutes clamp at 137V. Lower clamping voltage provides tighter protection of downstream components. The SMCJ85CA-TR clamps at 178V, providing looser protection. Selection depends on the maximum voltage tolerance of protected circuitry. For sensitive components, lower clamping voltage is preferred.

Q: Is the SMCJ85CA-TR with 178V clamping voltage compatible with the original design?

A: Compatibility depends on the protected circuit's voltage tolerance. The SMCJ85CA-TR clamps at 178V compared to 151V in the original part, representing a 27V difference. If the protected circuit can tolerate 178V transient peaks, substitution is acceptable. If the circuit requires clamping below 160V, the SMCJ85CA-TR is not suitable. Verify the maximum voltage rating of protected components before selection.

Q: Can I use SMCJ85CA (1500W) instead of SMLJ85CE3/TR13 (300W) in the same application?

A: Yes, if transient energy requirements do not exceed 1500W. The SMCJ85CA provides adequate protection for lower-energy transients. However, if the circuit experiences transients exceeding 1500W, the SMCJ85CA may be damaged or fail to clamp properly. Analyze the expected transient energy profile before substitution. When in doubt, select a part with power rating equal to or exceeding the calculated transient energy.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates unlimited shelf life without moisture absorption concerns. All substitute parts with MSL 1 rating can be stored indefinitely at standard conditions without requiring special desiccant packaging or baking procedures before reflow soldering. This simplifies supply chain management and reduces component handling complexity.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts listed are ROHS3 compliant. The Fairchild Semiconductor SMCJ85CA does not specify RoHS status in available data. If ROHS3 compliance is a design requirement, verify compliance documentation before selecting the Fairchild part. All other substitutes explicitly state ROHS3 compliance.

Q: What is the difference between 10/1000µs and 8/20µs pulse specifications?

A: These represent different test waveforms for peak pulse current measurement. The 10/1000µs waveform (used by most parts) represents a faster transient pulse, while 8/20µs (used by SMCJ85CA-TR) represents a slower pulse. Peak current values are not directly comparable between different waveforms. The SMCJ85CA-TR specification of 56A at 8/20µs does not directly equate to 56A at 10/1000µs. Consult manufacturer datasheets for waveform-specific performance when precise transient matching is required.

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