SMLJ51E3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ51E3/TR13 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 51V reverse standoff voltage and provides 300W peak pulse power dissipation in a DO-214AB (SMC) package. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching electrical characteristics within the 51V voltage class and compatible surface-mount packaging. Substitutes maintain the same reverse standoff voltage, breakdown voltage range, and unidirectional channel configuration while accommodating variations in clamping voltage, peak pulse current, and power dissipation ratings.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	51	V
Voltage - Breakdown (Min)	56.7	V
Voltage - Clamping (Max) @ Ipp	91.1	V
Current - Peak Pulse (10/1000µs)	37	A
Power - Peak Pulse	300	W
Type	Zener	—
Unidirectional Channels	1	—
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMLJ51E3/TR13 is determined by the following criteria:

Primary Matching Parameters:

Voltage - Reverse Standoff (Typ): 51V
Voltage - Breakdown (Min): 56.7V
Unidirectional Channels: 1
Package / Case: DO-214AB or SMC equivalent
Mounting Type: Surface Mount
Type: Zener diode

Secondary Variation Parameters: Substitute parts may differ in the following characteristics while maintaining functional equivalence:

Voltage - Clamping (Max) @ Ipp: Range 82.4V to 91.1V
Current - Peak Pulse (10/1000µs): Range 18.2A to 60.7A
Power - Peak Pulse: Range 1500W to 5000W
Operating Temperature Range: -65°C to -50°C (minimum) and 150°C to 175°C (maximum)
Manufacturer and base product series

All identified substitutes maintain RoHS3 compliance and EAR99 export classification. Substitutes are grouped by power dissipation capability and peak pulse current rating to facilitate selection based on application requirements.

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
SMLJ51E3/TR13	Microchip Technology	51	56.7	91.1	37	300	-55 to 150	DO-214AB, SMC
5.0SMDJ51A	Taiwan Semiconductor Corporation	51	56.7	82.4	60.7	5000	-55 to 175	DO-214AB, SMC
SMCJ51A	MDD	51	56.7	82.4	18.2	1500	-50 to 150	DO-214AB, SMC
SMCJ51A-13-F	Diodes Incorporated	51	56.7	82.4	18.2	1500	-55 to 150	DO-214AB, SMC
SMDJ51A	Alpha & Omega Semiconductor Inc.	51	56.7	82.4	36.5	3000	-55 to 150	DO-214AB, SMC
SMDJ51A-HR	Littelfuse Inc.	51	56.7	82.4	36.4	3000	-65 to 150	DO-214AB, SMC
SMLJ51A	Bourns Inc.	51	56.7	82.4	36.4	3000	-55 to 150	DO-214AB, SMC

Engineering Selection Recommendations

High Power Dissipation Applications (≥3000W): The 5.0SMDJ51A (Taiwan Semiconductor Corporation) provides the highest power dissipation rating at 5000W with peak pulse current of 60.7A. This part is suitable for applications requiring maximum transient energy absorption. Operating temperature range extends to 175°C. RoHS3 compliance and REACH unaffected status are confirmed.

Standard Power Dissipation Applications (3000W): The SMDJ51A (Alpha & Omega Semiconductor Inc.), SMDJ51A-HR (Littelfuse Inc.), and SMLJ51A (Bourns Inc.) all provide 3000W peak pulse power with peak pulse currents between 36.4A and 36.5A. These parts are functionally equivalent to the SMLJ51E3/TR13 in terms of power handling. SMLJ51A offers the highest inventory availability (28,264 pcs). SMDJ51A-HR extends the minimum operating temperature to -65°C. All three maintain RoHS3 compliance.

Lower Power Dissipation Applications (1500W): The SMCJ51A (MDD) and SMCJ51A-13-F (Diodes Incorporated) provide 1500W peak pulse power with 18.2A peak pulse current. These parts are suitable for applications with reduced transient energy requirements. SMCJ51A-13-F (Diodes Incorporated) maintains the same operating temperature range as the main part (-55°C to 150°C) and offers 3,200 pcs inventory availability.

Compliance and Regulatory Status: All substitute parts maintain RoHS3 compliance and EAR99 export classification. SMDJ51A-HR and SMLJ51A are marked as REACH Affected; all other substitutes are REACH Unaffected. Moisture sensitivity level (MSL 1 - Unlimited) is confirmed for all parts with available data.

Frequently Asked Questions (FAQ)

Q: Can SMCJ51A be used as a direct replacement for SMLJ51E3/TR13?

A: SMCJ51A shares the same 51V reverse standoff voltage, 56.7V minimum breakdown voltage, and DO-214AB/SMC package. However, it provides lower peak pulse current (18.2A versus 37A) and lower power dissipation (1500W versus 300W). Substitution is valid only if the application does not require the higher current and power ratings of the original part.

Q: What is the difference between SMDJ51A and SMLJ51A?

A: Both parts provide identical electrical specifications: 51V reverse standoff, 82.4V clamping voltage, 36.4-36.5A peak pulse current, and 3000W power dissipation. The primary difference is manufacturer (Alpha & Omega Semiconductor Inc. versus Bourns Inc.). SMLJ51A has significantly higher inventory availability (28,264 pcs versus 12,400 pcs). Both are suitable substitutes for the SMLJ51E3/TR13.

Q: Why does 5.0SMDJ51A have higher clamping voltage (82.4V) compared to SMLJ51E3/TR13 (91.1V)?

A: Clamping voltage variation within the same voltage class is a normal characteristic of TVS diode design. Both parts maintain the same 51V reverse standoff and 56.7V minimum breakdown voltage. The lower clamping voltage of 5.0SMDJ51A (82.4V) provides tighter voltage regulation during transient suppression. Selection between these parts depends on the specific clamping voltage requirement of the application circuit.

Q: Is SMDJ51A-HR suitable for extended temperature range applications?

A: Yes. SMDJ51A-HR (Littelfuse Inc.) extends the minimum operating temperature to -65°C compared to -55°C for most other substitutes. This part is designated as SMDJ-HR series, indicating high-reliability characteristics. It maintains 3000W power dissipation and 36.4A peak pulse current, making it suitable for applications requiring operation at lower temperatures.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Tape & Reel (TR) packaging is confirmed for SMLJ51E3/TR13 (main part), 5.0SMDJ51A, SMDJ51A, SMDJ51A-HR, SMCJ51A-13-F, and SMLJ51A. Packaging information for SMCJ51A (MDD) is not specified in available data. Verify packaging format with supplier documentation before procurement.

Q: What is the inventory status of substitute parts?

A: SMLJ51A (Bourns Inc.) has the highest inventory at 28,264 pcs. SMDJ51A (Alpha & Omega Semiconductor Inc.) has 12,400 pcs. 5.0SMDJ51A (Taiwan Semiconductor Corporation) has 9,100 pcs. SMCJ51A-13-F (Diodes Incorporated) has 3,200 pcs. SMCJ51A (MDD) has 1,140 pcs. SMDJ51A-HR (Littelfuse Inc.) has 1,511 pcs. The main part SMLJ51E3/TR13 has 713 pcs in stock.

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