1.5SMC16 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 1.5SMC16 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 13.6V reverse standoff voltage and 1500W peak pulse power rating. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	13.6	V
Voltage - Breakdown (Min)	14.4	V
Voltage - Clamping (Max) @ Ipp	23.63	V
Current - Peak Pulse (10/1000µs)	67.6	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution of the 1.5SMC16 is determined by the following critical parameters that must remain within acceptable tolerances:

Mandatory Matching Parameters:

Reverse standoff voltage: 13.6V (Typ)
Package type: DO-214AB, SMC surface mount
Unidirectional configuration: 1 channel
Diode type: Zener

Allowable Variation Parameters:

Voltage - Breakdown (Min): 14.4V to 15.2V
Voltage - Clamping (Max) @ Ipp: 22.5V to 23.63V
Current - Peak Pulse (10/1000µs): 67A to 70A
Power - Peak Pulse: 1500W (fixed)
Operating Temperature: -55°C to 150°C minimum range

All substitute parts listed maintain electrical compatibility within these defined tolerances while providing active product status and improved availability.

Parameter Comparison

Parameter	1.5SMC16 (Littelfuse)	1.5SMC16A (TSC)	SZ1.5SMC16AT3G (onsemi)	SMCJ1.5KE16A-TP (MCC)
Manufacturer	Littelfuse Inc.	Taiwan Semiconductor	onsemi	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	13.6V	13.6V	13.6V	13.6V
Voltage - Breakdown (Min)	14.4V	15.2V	15.2V	15.2V
Voltage - Clamping (Max) @ Ipp	23.63V	22.5V	22.5V	22.5V
Current - Peak Pulse (10/1000µs)	67.6A	70A	67A	67.6A
Power - Peak Pulse	1500W	1500W	1500W	1500W
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-65 to 150°C	-55 to 175°C
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: 1.5SMC16A (Taiwan Semiconductor Corporation)

The 1.5SMC16A is the recommended primary substitute. It maintains identical reverse standoff voltage (13.6V), operates within the same temperature range (-55 to 150°C), and is packaged in the same DO-214AB SMC configuration. The part is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Clamping voltage is reduced to 22.5V with peak pulse current increased to 70A, both within acceptable substitution tolerances.

Secondary Substitute: SMCJ1.5KE16A-TP (Micro Commercial Co)

The SMCJ1.5KE16A-TP provides an alternative with extended operating temperature range (-55 to 175°C), offering additional thermal margin for demanding applications. Electrical parameters match the primary substitute with 22.5V clamping voltage and 67.6A peak pulse current. ROHS3 compliance and unlimited MSL rating are maintained.

Tertiary Substitute: SZ1.5SMC16AT3G (onsemi)

The SZ1.5SMC16AT3G is qualified to AEC-Q101 automotive standard with extended lower temperature rating (-65°C). This part is suitable for automotive and high-reliability applications. Peak pulse current is specified at 67A with 22.5V clamping voltage. This option provides automotive-grade qualification when required by application specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1.5SMC16A directly replace the obsolete 1.5SMC16?

A: Yes. Both parts share identical reverse standoff voltage (13.6V), package type (DO-214AB SMC), and operating temperature range (-55 to 150°C). The clamping voltage reduction from 23.63V to 22.5V and peak pulse current increase from 67.6A to 70A are within acceptable substitution tolerances for general-purpose transient suppression applications.

Q: What is the difference between the three substitute options?

A: All three substitutes maintain the core electrical specifications (13.6V standoff, 1500W peak power, DO-214AB package). The 1.5SMC16A offers standard performance with active status. The SMCJ1.5KE16A-TP extends the upper operating temperature to 175°C. The SZ1.5SMC16AT3G adds automotive qualification (AEC-Q101) and extends the lower temperature limit to -65°C.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AB (SMC) surface mount package, ensuring mechanical and thermal compatibility with existing PCB layouts and assembly processes.

Q: What compliance certifications are maintained across substitutes?

A: The 1.5SMC16A and SMCJ1.5KE16A-TP maintain ROHS3 compliance with unlimited moisture sensitivity level (MSL 1). The SZ1.5SMC16AT3G adds AEC-Q101 automotive qualification. All parts are EAR99 classified.

Q: Which substitute should be selected for new designs?

A: For general-purpose applications, the 1.5SMC16A is recommended due to active production status and standard operating range. For automotive applications, select SZ1.5SMC16AT3G. For applications requiring extended temperature operation above 150°C, select SMCJ1.5KE16A-TP.

Q: Are there inventory considerations for substitute selection?

A: The 1.5SMC16A has the highest inventory availability (16,100 pcs), followed by SZ1.5SMC16AT3G (3,916 pcs) and SMCJ1.5KE16A-TP (3,859 pcs). Procurement timelines may favor the 1.5SMC16A for high-volume requirements.

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