SMLJ17CA Equivalent & Substitute Parts

Part Overview

The SMLJ17CA is a bidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 17V reverse standoff voltage, 27.6V maximum clamping voltage, and 3000W peak pulse power rating in a DO-214AB (SMC) package. The part is active in production, RoHS3 compliant, and carries unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified when they maintain critical electrical parameters—specifically reverse standoff voltage, clamping voltage, and peak pulse current—while accommodating variations in peak pulse power and operating temperature ranges based on application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	18.9	V
Voltage - Clamping (Max) @ Ipp	27.6	V
Current - Peak Pulse (10/1000µs)	106.6	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ17CA are classified into two categories based on electrical parameter compatibility:

Direct Equivalents maintain all critical electrical parameters within specification: 17V reverse standoff voltage, 18.9V minimum breakdown voltage, 27.6V maximum clamping voltage, and surface-mount DO-214AB packaging. These parts are interchangeable in applications where the 3000W peak pulse power rating and specified operating temperature range are acceptable.

Similar Substitutes maintain the core voltage parameters (17V standoff, 27.6V clamping) but differ in peak pulse current capacity and/or peak pulse power rating. These parts are suitable for applications where higher power dissipation capability (5000W) or lower current handling (1500W) is acceptable, provided the voltage protection thresholds remain within the required specification window.

Key Parameters for Substitution Determination:

Voltage - Reverse Standoff: 17V (fixed requirement)
Voltage - Clamping (Max) @ Ipp: 27.6V (fixed requirement)
Package / Case: DO-214AB, SMC (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)
Peak Pulse Current: 54.4A to 181A (variable, application-dependent)
Peak Pulse Power: 1500W to 5000W (variable, application-dependent)
Operating Temperature: -55°C to 175°C (variable, application-dependent)

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Voltage (V)	Clamping Voltage (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Operating Temp (°C)	Package
SMLJ17CA	Bourns Inc.	17	18.9	27.6	106.6	3000	-55 to 150	DO-214AB, SMC
SMDJ17CA	Alpha & Omega Semiconductor Inc.	17	18.9	27.6	108.7	3000	-55 to 150	DO-214AB, SMC
5.0SMDJ17CA	MDE Semiconductor Inc	17	18.9	27.6	181	5000	-55 to 150	DO-214AB, SMC
5.0SMDJ17CA-T7	Littelfuse Inc.	17	18.9	27.6	181	5000	-65 to 150	DO-214AB, SMC
SM30T21CAY	STMicroelectronics	18	20	29.2	102.7	3000	-55 to 175	DO-214AB, SMC
SMCJ17CA-TP	Micro Commercial Co	17	18.9	27.6	54.4	1500	-55 to 175	DO-214AB, SMC

Engineering Selection Recommendations

Direct Equivalent Selection: SMDJ17CA (Alpha & Omega Semiconductor Inc.) is the primary direct equivalent, matching all critical electrical parameters and operating temperature range. This part maintains 17V standoff voltage, 27.6V clamping voltage, and 3000W peak pulse power with marginally higher peak pulse current (108.7A vs. 106.6A). Both parts are RoHS3 compliant and carry EAR99 ECCN classification.

Higher Power Capability Selection: 5.0SMDJ17CA (MDE Semiconductor Inc.) and 5.0SMDJ17CA-T7 (Littelfuse Inc.) provide 5000W peak pulse power rating with 181A peak pulse current, suitable for applications requiring enhanced transient energy absorption. The Littelfuse variant extends the lower operating temperature limit to -65°C. Both maintain the 17V standoff and 27.6V clamping specifications. Selection between these two depends on extended low-temperature operation requirements.

Lower Power Capability Selection: SMCJ17CA-TP (Micro Commercial Co) provides 1500W peak pulse power with 54.4A peak pulse current, suitable for lower-energy transient environments. This part extends the upper operating temperature to 175°C and is appropriate for applications with reduced overvoltage energy levels.

Voltage Parameter Deviation: SM30T21CAY (STMicroelectronics) deviates from the core voltage specification with 18V standoff voltage, 20V breakdown voltage, and 29.2V clamping voltage. This part is suitable only when the application circuit can tolerate higher clamping voltage and later trigger threshold. The part carries AEC-Q101 automotive qualification and extends operating temperature to 175°C.

Incomplete Data Parts: SMCJ17CA and SMCJ17CA (Fairchild Semiconductor) lack sufficient electrical parameter documentation for engineering selection and should not be used as substitutes without complete datasheet verification.

Frequently Asked Questions (FAQ)

Q: Can SMDJ17CA directly replace SMLJ17CA without circuit modification? A: Yes. SMDJ17CA maintains identical standoff voltage (17V), clamping voltage (27.6V), and power rating (3000W) with equivalent peak pulse current (108.7A vs. 106.6A). Both use DO-214AB packaging and operate across -55°C to 150°C. No circuit modification is required.

Q: When should 5.0SMDJ17CA be selected over SMLJ17CA? A: Select 5.0SMDJ17CA when the application experiences transient energy levels exceeding 3000W or when peak pulse current requirements exceed 106.6A. The 5000W rating provides additional margin for high-energy transient events while maintaining identical voltage protection thresholds.

Q: Is SM30T21CAY compatible with SMLJ17CA? A: SM30T21CAY is not a direct equivalent. It specifies 18V standoff voltage and 29.2V clamping voltage, which exceed SMLJ17CA specifications by 1V and 1.6V respectively. Use only when the protected circuit can tolerate delayed trigger threshold and higher clamping voltage. Verify circuit tolerance before substitution.

Q: What is the difference between SMCJ17CA-TP and SMLJ17CA? A: SMCJ17CA-TP maintains identical voltage parameters (17V standoff, 27.6V clamping) but provides only 1500W peak pulse power versus 3000W. Select SMCJ17CA-TP only for low-energy transient environments or when peak pulse current does not exceed 54.4A. The part extends operating temperature to 175°C.

Q: Are there packaging differences between substitute parts? A: All listed substitutes use DO-214AB (SMC) surface-mount packaging. Packaging compatibility is maintained across all direct and similar equivalents. Verify tape & reel (TR) or bulk packaging availability based on procurement requirements.

Q: What compliance certifications apply to these substitutes? A: All parts listed are RoHS3 compliant. SM30T21CAY carries additional AEC-Q101 automotive qualification. REACH status varies: SMLJ17CA is REACH Affected; SMDJ17CA, 5.0SMDJ17CA, 5.0SMDJ17CA-T7, SM30T21CAY, and SMCJ17CA-TP are REACH Unaffected. Verify compliance requirements for your application before final selection.

Q: Can SMCJ17CA or SMCJ17CA (Fairchild) be used as substitutes? A: These parts lack complete electrical parameter documentation in available data. Do not use as substitutes without obtaining and verifying complete datasheets against SMLJ17CA specifications.

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