SMLJ14A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMLJ14A is a unidirectional Zener TVS diode manufactured by Bourns Inc., designed for general-purpose transient voltage suppression applications. This surface-mount component operates across a temperature range of -55°C to 150°C and is housed 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 performance characteristics and mechanical compatibility within the TVS diode category. Substitution becomes necessary due to inventory availability, supply chain optimization, or design flexibility requirements while maintaining circuit protection specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	14	V
Voltage - Breakdown (Min)	15.6	V
Voltage - Clamping (Max) @ Ipp	23.2	V
Current - Peak Pulse (10/1000µs)	129.4	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Unidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMLJ14A are classified based on strict electrical parameter matching within the TVS diode category. The primary substitution criteria are:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 14V
Voltage - Clamping (Max) @ Ipp: 23.2V
Voltage - Breakdown (Min): 15.6V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Unidirectional Channels: 1

Substitution Categories:

Direct Equivalents maintain identical electrical specifications across all critical parameters, including peak pulse current and power ratings. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Substitutes match voltage specifications and package type but may differ in peak pulse current (Ipp) and power dissipation ratings. These parts provide equivalent voltage clamping performance but with different current-handling capabilities. Selection depends on circuit peak current requirements.

Partial Substitutes match voltage standoff and clamping specifications but operate within different temperature ranges or possess automotive-grade qualifications. These parts are suitable for applications where environmental or qualification requirements differ from the original specification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	RoHS Status
SMLJ14A	Bourns Inc.	14	23.2	129.4	3000	DO-214AB, SMC	-55 to 150	ROHS3
SMDJ14A	Alpha & Omega Semiconductor Inc.	14	23.2	129.4	3000	DO-214AB, SMC	-55 to 150	ROHS3
5.0SMDJ14A	MDE Semiconductor Inc	14	23.2	216	5000	DO-214AB, SMC	-55 to 150	ROHS3
5.0SMDJ14A-T7	Littelfuse Inc.	14	23.2	216	5000	DO-214AB, SMC	-65 to 150	ROHS3
SMCJ14A	Meritek	14	23.2	64.66	1500	DO-214AB, SMC	-55 to 150	ROHS3
TPSMC15A	Littelfuse	12.8	21.2	71.7	1500	DO-214AB, SMC	-55 to 150	ROHS3
TPSMC16A	Littelfuse Inc.	13.6	22.5	67.6	1500	DO-214AB, SMC	-55 to 150	ROHS3
TPSMC18A	Littelfuse Inc.	15.3	25.2	60.3	1500	DO-214AB, SMC	-55 to 150	ROHS3

Engineering Selection Recommendations

Direct Substitution (Recommended for Pin-Compatible Replacement):

SMDJ14A (Alpha & Omega Semiconductor Inc.) is the primary direct equivalent. This part maintains identical electrical specifications: 14V reverse standoff, 23.2V clamping voltage, 129.4A peak pulse current, and 3000W power dissipation. Both parts share DO-214AB packaging, surface-mount configuration, and ROHS3 compliance. This substitution requires no circuit modification and provides equivalent protection performance.

Higher Current Capacity Substitutes:

5.0SMDJ14A (MDE Semiconductor Inc.) and 5.0SMDJ14A-T7 (Littelfuse Inc.) maintain identical voltage specifications (14V standoff, 23.2V clamping) but provide enhanced current handling at 216A peak pulse and 5000W power dissipation. These parts are suitable for applications requiring higher transient current absorption. The 5.0SMDJ14A-T7 variant extends the lower operating temperature limit to -65°C, providing broader environmental coverage while maintaining ROHS3 compliance.

Lower Current Capacity Substitutes:

SMCJ14A (Meritek) matches voltage specifications exactly but operates at reduced peak pulse current (64.66A) and power dissipation (1500W). This part is appropriate for circuits with lower transient current requirements and provides cost optimization for applications not demanding full 3000W dissipation capacity.

Voltage-Adjacent Substitutes (Partial Compatibility):

TPSMC15A, TPSMC16A, and TPSMC18A (Littelfuse) represent voltage-adjacent alternatives with automotive-grade qualification (AEC-Q101). These parts deviate from the 14V standoff specification but maintain surface-mount DO-214AB packaging and ROHS3 compliance. TPSMC15A operates at 12.8V standoff with 21.2V clamping; TPSMC16A at 13.6V standoff with 22.5V clamping; TPSMC18A at 15.3V standoff with 25.2V clamping. Selection of these parts requires circuit voltage tolerance verification and is limited to applications where the voltage deviation is acceptable.

Frequently Asked Questions (FAQ)

Q: Can SMDJ14A directly replace SMLJ14A without circuit modification?

A: Yes. SMDJ14A is a direct electrical and mechanical equivalent. Both parts share identical voltage specifications (14V standoff, 23.2V clamping), peak pulse current (129.4A), power dissipation (3000W), and DO-214AB packaging. No circuit redesign is required.

Q: What is the difference between SMLJ14A and 5.0SMDJ14A?

A: Both parts maintain identical voltage protection specifications (14V standoff, 23.2V clamping voltage). The primary difference is current handling capacity: SMLJ14A handles 129.4A peak pulse at 3000W, while 5.0SMDJ14A handles 216A peak pulse at 5000W. Selection depends on the circuit's transient current magnitude. Higher current applications benefit from the 5.0SMDJ14A variant.

Q: Are TPSMC15A, TPSMC16A, and TPSMC18A suitable replacements for SMLJ14A?

A: These parts are not direct replacements due to voltage specification differences. TPSMC15A operates at 12.8V standoff (versus 14V), TPSMC16A at 13.6V standoff, and TPSMC18A at 15.3V standoff. Substitution is only valid if the circuit design tolerates the voltage deviation. These parts offer automotive-grade qualification (AEC-Q101) and are appropriate for automotive applications where voltage tolerance exists.

Q: What packaging considerations apply to these substitute parts?

A: All listed substitute parts utilize DO-214AB (SMC) surface-mount packaging, matching the SMLJ14A footprint. Pin compatibility is maintained across all direct and similar substitutes, enabling PCB-level interchangeability without layout modification. Verify packaging designation on component datasheets prior to procurement.

Q: How do I select between SMCJ14A and SMLJ14A if both match voltage specifications?

A: Both parts maintain 14V standoff and 23.2V clamping voltage. The distinction is peak pulse current capacity: SMLJ14A handles 129.4A at 3000W, while SMCJ14A handles 64.66A at 1500W. For circuits with peak transient currents below 65A, SMCJ14A provides cost-effective protection. For circuits exceeding 65A peak current, SMLJ14A is required to prevent component thermal stress.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the SMLJ14A environmental standard. This ensures compatibility with regulatory requirements across consumer, industrial, and automotive applications.

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