SMAJ17C Equivalent & Substitute Parts

Part Overview

The SMAJ17C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 17V reverse standoff voltage with a 28.98V maximum clamping voltage and 14.5A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ17C is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	17	V
Breakdown Voltage (Min)	17.91	V
Clamping Voltage (Max) @ Ipp	28.98	V
Peak Pulse Current (10/1000µs)	14.5	A
Peak Pulse Power	400	W
Operating Temperature Range	-65 to 150	°C
Package Type	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMAJ17C is determined by strict electrical and mechanical compatibility within the following parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 17V (fixed requirement)
Package type: DO-214AC (SMA) surface mount (fixed requirement)
Bidirectional channels: 1 (fixed requirement)
Clamping voltage range: 27.6V to 30.5V (acceptable variance from original 28.98V)
Peak pulse current: 14.49A to 18.1A (acceptable variance from original 14.5A)
Peak pulse power: 400W to 500W (acceptable variance from original 400W)
Operating temperature: -65°C to -55°C minimum; 150°C to 175°C maximum (acceptable variance)
RoHS3 compliance: Required

All substitute parts listed maintain the same 17V standoff voltage, DO-214AC package configuration, and single bidirectional channel topology. Variations in clamping voltage, peak pulse current, and power dissipation remain within acceptable engineering tolerances for general-purpose TVS applications.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Temp Range (°C)	Product Status
SMAJ17C	Littelfuse Inc.	17	17.91	28.98	14.5	400	-65 to 150	Obsolete
SMAJ17CA	Meritek	17	18.9	27.6	14.49	400	-55 to 150	Active
SMAJ17CA-13-F	Diodes Incorporated	17	18.9	27.6	14.5	400	-55 to 150	Active
SMAJ17CA-TP	Micro Commercial Co	17	18.9	27.6	14.5	400	-55 to 175	Active
SMAJ17CAE3/TR13	Microchip Technology	17	18.9	27.6	18.1	500	-65 to 150	Active
SMAJ17CE3/TR13	Microchip Technology	17	18.9	30.5	16.4	500	-65 to 150	Active
TV04A170JB-G	Comchip Technology	17	18.9	27.6	14.49	400	-55 to 150	Active

Engineering Selection Recommendations

All listed substitute parts are active production components with ROHS3 compliance, ensuring long-term availability and regulatory conformance. Selection among substitutes depends on specific application requirements:

For applications requiring extended low-temperature operation (-65°C minimum): SMAJ17CAE3/TR13 or SMAJ17CE3/TR13 (Microchip Technology) maintain the original -65°C lower temperature limit.

For applications requiring extended high-temperature operation (175°C maximum): SMAJ17CA-TP (Micro Commercial Co) extends the upper temperature range to 175°C.

For applications requiring higher current handling capability: SMAJ17CAE3/TR13 (18.1A peak pulse current, 500W power) or SMAJ17CE3/TR13 (16.4A peak pulse current, 500W power) provide increased transient energy absorption.

For standard general-purpose applications with baseline specifications: SMAJ17CA (Meritek), SMAJ17CA-13-F (Diodes Incorporated), or TV04A170JB-G (Comchip Technology) provide direct functional equivalence with active production status.

All substitutes maintain identical package configuration (DO-214AC/SMA), mounting type (surface mount), and core electrical characteristics (17V standoff voltage, single bidirectional channel) required for direct board-level replacement.

Frequently Asked Questions (FAQ)

Q: Can SMAJ17C be directly replaced with any of these substitute parts?

A: Yes. All listed substitutes share the same 17V reverse standoff voltage, DO-214AC (SMA) package, and single bidirectional channel configuration. Direct board-level replacement is electrically and mechanically compatible without design modification.

Q: What is the difference between clamping voltage variations (27.6V, 28.98V, 30.5V)?

A: Clamping voltage represents the maximum voltage across the TVS diode during transient suppression at peak pulse current. The original SMAJ17C specifies 28.98V; substitutes range from 27.6V to 30.5V. These variations remain within acceptable engineering tolerance for general-purpose overvoltage protection and do not affect substitutability.

Q: Why do some substitutes have higher peak pulse current ratings (18.1A vs 14.5A)?

A: Higher peak pulse current ratings indicate greater transient energy absorption capability. SMAJ17CAE3/TR13 (18.1A) and SMAJ17CE3/TR13 (16.4A) provide enhanced protection margin compared to the original 14.5A specification. These are direct substitutes with improved performance characteristics.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the significance of operating temperature range differences?

A: The original SMAJ17C operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C, representing a 10°C reduction in low-temperature capability. SMAJ17CAE3/TR13 and SMAJ17CE3/TR13 maintain the -65°C minimum. SMAJ17CA-TP extends the maximum to 175°C. Selection depends on application environmental requirements.

Q: Can I use SMAJ17CE3/TR13 with its higher clamping voltage (30.5V) in place of SMAJ17C (28.98V)?

A: Yes. The 30.5V clamping voltage remains within acceptable substitution parameters for general-purpose TVS applications. The higher clamping voltage provides slightly reduced protection margin but maintains functional compatibility.

Q: What packaging format is specified for these substitutes?

A: All substitutes are supplied in Tape & Reel (TR) format for automated assembly. The physical package remains DO-214AC (SMA) surface mount, identical to the original SMAJ17C.

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