SMAJ14C Equivalent & Substitute Parts

Part Overview

The SMAJ14C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 14V reverse standoff voltage, 24.36V maximum clamping voltage, and 400W peak pulse power rating in a DO-214AC (SMA) package. The SMAJ14C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal specifications while meeting modern RoHS3 compliance standards.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	14	V
Voltage - Breakdown (Min)	14.76	V
Voltage - Clamping (Max) @ Ipp	24.36	V
Current - Peak Pulse (10/1000µs)	17.2	A
Power - Peak Pulse	400	W
Package / Case	DO-214AC, SMA	—
Operating Temperature Range	-65°C ~ 150°C	TJ
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ14C is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 14V (fixed)
Package type: DO-214AC / SMA (mandatory for mechanical compatibility)
Bidirectional channels: 1 (fixed)
Type: Zener TVS diode (fixed)
RoHS3 compliance (required for regulatory alignment)
Moisture sensitivity level: 1 (Unlimited)

Allowable Parameter Variations:

Clamping voltage (Max @ Ipp): 23.2V to 25.8V (within acceptable transient suppression range)
Peak pulse current: 17.2A to 21.5A (higher values provide enhanced protection margin)
Peak pulse power: 400W to 500W (higher ratings maintain safety margin)
Operating temperature range: -55°C to -65°C minimum; 150°C to 175°C maximum (broader ranges acceptable)
Product status: Active substitutes preferred over obsolete originals
Packaging format: Tape & Reel (TR) or Cut Tape (CT) acceptable for manufacturing

Parameter Comparison

Parameter	SMAJ14C (Littelfuse)	SMAJ14CA (Good-Ark)	SMAJ14CA-13-F (Diodes Inc.)	SMAJ14CA-TP (MCC)	SMAJ14CAE3/TR13 (Microchip)	SMAJ14CE3/TR13 (Microchip)
Voltage - Reverse Standoff (Typ)	14V	14V	14V	14V	14V	14V
Voltage - Breakdown (Min)	14.76V	15.6V	15.6V	15.6V	15.6V	15.6V
Voltage - Clamping (Max) @ Ipp	24.36V	23.2V	23.2V	23.2V	23.2V	25.8V
Current - Peak Pulse (10/1000µs)	17.2A	17.2A	17.2A	17.2A	21.5A	19.4A
Power - Peak Pulse	400W	400W	400W	400W	500W	500W
Operating Temperature Range	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TA)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts are qualified replacements for the SMAJ14C based on electrical parameter compatibility and regulatory compliance. Selection among active alternatives should prioritize the following factors:

Product Status Advantage: All substitute parts carry Active status, eliminating obsolescence risk associated with the original SMAJ14C. This ensures long-term availability and supply chain stability.

Compliance Alignment: All substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity ratings, matching the original specification and supporting manufacturing process continuity.

Electrical Performance Tiers:

The SMAJ14CA (Good-Ark Semiconductor) and SMAJ14CA-13-F (Diodes Incorporated) provide direct electrical equivalence with 23.2V clamping voltage and 17.2A peak pulse current, maintaining identical power dissipation at 400W.

The SMAJ14CA-TP (Micro Commercial Co) offers the same electrical performance as the SMAJ14CA with extended operating temperature range to 175°C, providing thermal margin for high-ambient applications.

The SMAJ14CAE3/TR13 (Microchip Technology) delivers enhanced protection capability with 21.5A peak pulse current and 500W power rating while maintaining 23.2V clamping voltage, suitable for applications requiring higher transient energy absorption.

The SMAJ14CE3/TR13 (Microchip Technology) provides the highest clamping voltage at 25.8V with 19.4A peak pulse current and 500W power rating, appropriate for circuits with tighter voltage regulation requirements.

Packaging Considerations: All substitutes are available in Tape & Reel (TR) format, standard for automated assembly. Good-Ark Semiconductor also offers Cut Tape (CT) packaging for lower-volume requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ14CA substitute directly for SMAJ14C in existing designs?

A: Yes. The SMAJ14CA maintains identical reverse standoff voltage (14V), package type (DO-214AC/SMA), and peak pulse current (17.2A). The 1.16V reduction in clamping voltage (23.2V vs. 24.36V) falls within acceptable transient suppression tolerance for general-purpose applications. Active product status eliminates obsolescence concerns.

Q: What is the difference between SMAJ14CAE3/TR13 and SMAJ14CE3/TR13?

A: Both are Microchip Technology products with enhanced power ratings (500W vs. 400W). SMAJ14CAE3/TR13 maintains 23.2V clamping voltage with 21.5A peak pulse current. SMAJ14CE3/TR13 increases clamping voltage to 25.8V with 19.4A peak pulse current. Selection depends on whether the application prioritizes lower clamping voltage or higher current handling capacity.

Q: Are all substitutes compatible with the same PCB footprint?

A: Yes. All substitute parts use DO-214AC (SMA) package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for SMAJ14C.

Q: Does operating temperature range affect substitution eligibility?

A: Operating temperature range variations are acceptable provided the application's thermal requirements fall within the substitute part's specification. SMAJ14CA-TP extends the upper limit to 175°C, beneficial for high-temperature environments. SMAJ14CA (Good-Ark) operates to 150°C, matching the original SMAJ14C specification.

Q: Which substitute offers the best protection margin?

A: SMAJ14CAE3/TR13 and SMAJ14CE3/TR13 both provide 500W peak pulse power (vs. 400W original), offering enhanced energy absorption capacity. SMAJ14CAE3/TR13 maintains lower clamping voltage (23.2V) for tighter voltage control, while SMAJ14CE3/TR13 provides higher clamping voltage (25.8V) for applications with broader voltage tolerance.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity, meeting modern regulatory and manufacturing requirements.

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