SMLJ20CE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMLJ20CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This bidirectional zener diode operates with a 20V reverse standoff voltage and provides clamping at 35.8V maximum, with a peak pulse current rating of 83.8A and 300W peak pulse power dissipation. The component is housed in a DO-214AB (SMC) surface mount package and is supplied in Tape & Reel packaging.

The SMLJ20CE3/TR13 maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical characteristics within the 20V protection class, allowing for direct replacement in circuit designs where the specified parameters remain within acceptable tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	20	V
Voltage - Breakdown (Min)	22.2	V
Voltage - Clamping (Max) @ Ipp	35.8	V
Current - Peak Pulse (10/1000µs)	83.8	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	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ20CE3/TR13 are identified based on the following critical electrical and mechanical parameters:

Matching Criteria:

Voltage - Reverse Standoff: 20V (identical across all substitutes)
Voltage - Breakdown (Min): 22.2V (identical across all substitutes)
Package / Case: DO-214AB, SMC (identical across all substitutes)
Mounting Type: Surface Mount (identical across all substitutes)
Type: Zener, Bidirectional (identical across all substitutes)
Bidirectional Channels: 1 (identical across all substitutes)
RoHS3 Compliance: All substitutes maintain compliance
Operating Temperature Range: -55°C to 150°C minimum (all substitutes meet or exceed)

Variable Parameters Affecting Substitution:

Voltage - Clamping (Max) @ Ipp: Ranges from 32.4V to 35.8V
Current - Peak Pulse (10/1000µs): Ranges from 46.3A to 155A
Power - Peak Pulse: Ranges from 1500W to 5000W
Manufacturer and packaging format (Tape & Reel, Bulk, Cut Tape)

Substitutes are grouped by clamping voltage and current handling capability. Parts with lower clamping voltages (32.4V) and reduced peak pulse current ratings provide conservative protection margins. Parts with higher peak pulse current ratings (92.6A to 155A) and increased power dissipation (3000W to 5000W) offer enhanced transient suppression capacity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Packaging	RoHS3
SMLJ20CE3/TR13	Microchip Technology	35.8	83.8	300	-55 to 150	Tape & Reel	Yes
5.0SMDJ20CA	MDE Semiconductor Inc	32.4	155	5000	-55 to 150	Tape & Reel	Yes
SMCJ20CA	Fairchild Semiconductor	32.4	46.3	1500	-55 to 150	Bulk	Yes
SMCJ20CA-13-F	Diodes Incorporated	32.4	46.3	1500	-55 to 150	Tape & Reel	Yes
SMCJ20CA-TP	Micro Commercial Co	32.4	46.3	1500	-55 to 175	Cut Tape	Yes
SMDJ20CA	Alpha & Omega Semiconductor Inc.	32.4	92.6	3000	-55 to 150	Tape & Reel	Yes
SMDJ20CA-T7	Littelfuse Inc.	32.4	92.6	3000	-65 to 150	Tape & Reel	Yes
SMLJ20CA	Bourns Inc.	32.4	92.6	3000	-55 to 150	Tape & Reel	Yes
SMLJ20CA-TP	Micro Commercial Co	32.4	92.6	3000	-55 to 175	Cut Tape	Yes

Engineering Selection Recommendations

Direct Electrical Equivalents (Clamping Voltage 32.4V):

The majority of substitute parts operate at a clamping voltage of 32.4V, which is 3.4V lower than the SMLJ20CE3/TR13 (35.8V). This represents a more aggressive clamping characteristic and provides tighter voltage regulation during transient events. These parts are electrically suitable for applications where the lower clamping voltage does not exceed circuit component voltage ratings.

Current and Power Handling Considerations:

Substitute parts are available across three power dissipation levels:

1500W (46.3A peak pulse): SMCJ20CA variants from Fairchild Semiconductor and Diodes Incorporated
3000W (92.6A peak pulse): SMDJ20CA, SMLJ20CA variants from Alpha & Omega Semiconductor, Littelfuse, Bourns, and Micro Commercial Co
5000W (155A peak pulse): 5.0SMDJ20CA from MDE Semiconductor Inc

Selection between these options depends on the magnitude and duration of transient events in the target application. The original SMLJ20CE3/TR13 at 300W represents the lowest power rating in this group and is suitable for lower-energy transient suppression. Higher-rated alternatives provide enhanced protection for circuits experiencing more severe transient conditions.

Packaging and Supply Format:

The SMLJ20CE3/TR13 is supplied in Tape & Reel format. Equivalent parts in Tape & Reel packaging include 5.0SMDJ20CA, SMCJ20CA-13-F, SMDJ20CA, SMDJ20CA-T7, and SMLJ20CA. Bulk and Cut Tape options are available from alternative manufacturers for different procurement requirements.

Compliance and Temperature Range:

All substitute parts maintain RoHS3 compliance and MSL 1 (unlimited moisture sensitivity). Operating temperature ranges are -55°C to 150°C for most substitutes, with extended upper limits of -55°C to 175°C available from Micro Commercial Co (SMCJ20CA-TP, SMLJ20CA-TP) and -65°C lower limit from Littelfuse (SMDJ20CA-T7).

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower clamping voltage (32.4V) in place of the SMLJ20CE3/TR13 (35.8V)?

A: Yes, provided the circuit design accommodates the lower clamping voltage. A 32.4V clamp is more aggressive and will regulate transient voltages to a lower level. Verify that all downstream components tolerate this reduced voltage ceiling.

Q: What is the difference between the 1500W, 3000W, and 5000W rated substitutes?

A: These ratings reflect the peak pulse power dissipation capability during transient suppression. Higher-rated parts absorb more energy during transient events. Selection depends on the expected magnitude and frequency of transient pulses in your application. The original SMLJ20CE3/TR13 at 300W is the lowest-rated option.

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

A: No. The SMLJ20CE3/TR13 is supplied in Tape & Reel format. Equivalent Tape & Reel options include 5.0SMDJ20CA, SMCJ20CA-13-F, SMDJ20CA, SMDJ20CA-T7, and SMLJ20CA. Bulk and Cut Tape formats are available from other manufacturers.

Q: Do all substitutes maintain the same operating temperature range?

A: Most substitutes operate from -55°C to 150°C, matching the original part. Extended temperature ranges are available: Micro Commercial Co parts extend to 175°C, and Littelfuse SMDJ20CA-T7 extends to -65°C minimum.

Q: What is the significance of the DO-214AB (SMC) package designation?

A: All parts in this comparison use the DO-214AB surface mount package, also designated SMC. This ensures mechanical and electrical compatibility with existing PCB layouts and soldering processes. No package conversion is required for any substitute.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and are suitable for applications requiring restricted substance compliance.

Q: How do I choose between SMDJ and SMCJ variants?

A: SMDJ variants (from Alpha & Omega Semiconductor, Littelfuse, Bourns) provide 92.6A peak pulse current and 3000W power dissipation. SMCJ variants (from Fairchild Semiconductor, Diodes Incorporated) provide 46.3A peak pulse current and 1500W power dissipation. SMDJ parts offer higher transient suppression capacity. Selection depends on application transient severity.

Q: What does the "-T7" or "-TP" suffix indicate in part numbers?

A: These suffixes denote packaging format and supplier designation. "-T7" indicates Littelfuse's Digi-Reel tape format. "-TP" indicates Micro Commercial Co's Cut Tape packaging. These are supplier-specific identifiers and do not affect electrical performance.

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