SMAJ170C Equivalent & Substitute Parts

Part Overview

The SMAJ170C 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 170V reverse standoff voltage with a 288.75V maximum clamping voltage and 1.5A peak pulse current capability in a DO-214AC (SMA) package.

The SMAJ170C is classified as obsolete. Equivalent and substitute parts listed below provide active alternatives with comparable electrical and mechanical specifications suitable for direct replacement in circuit designs requiring TVS protection at the 170V standoff level.

Key Parameters

Parameter	SMAJ170C (Main Part)
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	179.1V
Voltage - Clamping (Max) @ Ipp	288.75V
Current - Peak Pulse (10/1000µs)	1.5A
Power - Peak Pulse	400W
Operating Temperature	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SMAJ170C is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 170V to maintain circuit protection threshold
Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount for PCB assembly compatibility
Type: Must be Zener diode for functional equivalence
Bidirectional Channels: Must be 1 channel
RoHS Status: Must maintain ROHS3 compliance for regulatory alignment

Substitute parts are grouped by their ability to meet these core requirements while maintaining electrical performance within acceptable tolerances. Variations in clamping voltage (275V to 304V), peak pulse current (1.4A to 1.8A), and power dissipation (400W to 500W) are acceptable within the SMAJ series design envelope for general-purpose TVS applications.

Parameter Comparison

Parameter	SMAJ170C	SMAJ170CA (Meritek)	SMAJ170CA-13-F (Diodes Inc.)	SMAJ170CA-TP (MCC)	SMAJ170CAE3/TR13 (Microchip)	SMAJ170CE3/TR13 (Microchip)	TV04A171JB-G (Comchip)
Voltage - Reverse Standoff (Typ)	170V	170V	170V	170V	170V	170V	170V
Voltage - Breakdown (Min)	179.1V	189V	189V	189V	189V	189V	189V
Voltage - Clamping (Max) @ Ipp	288.75V	275V	275V	275V	275V	304V	275V
Current - Peak Pulse (10/1000µs)	1.5A	1.45A	1.4A	1.5A	1.8A	1.6A	1.45A
Power - Peak Pulse	400W	400W	400W	400W	500W	500W	400W
Operating Temperature	-65°C ~ 150°C (TJ)	-55°C ~ 150°C	-55°C ~ 150°C (TJ)	-55°C ~ 175°C (TA)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Package / Case	DO-214AC, SMA	DO-214AC (SMA)	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed maintain active product status with ROHS3 compliance and REACH unaffected certifications, ensuring regulatory alignment and supply chain continuity.

SMAJ170CA (Meritek) and TV04A171JB-G (Comchip Technology) provide direct electrical equivalence with 275V clamping voltage and 1.45A peak pulse current, matching the functional envelope of the obsolete SMAJ170C within acceptable design tolerances.

SMAJ170CA-13-F (Diodes Incorporated) offers the highest inventory availability (29,967 pcs) with 275V clamping and 1.4A peak pulse current, suitable for high-volume production requirements.

SMAJ170CA-TP (Micro Commercial Co) extends the operating temperature range to -55°C ~ 175°C (TA) with 1.5A peak pulse current matching the original specification, providing enhanced thermal performance for demanding applications.

SMAJ170CAE3/TR13 and SMAJ170CE3/TR13 (Microchip Technology) deliver increased power dissipation capability at 500W peak pulse with peak pulse currents of 1.8A and 1.6A respectively, offering margin for transient protection in higher-stress environments while maintaining the -65°C lower temperature bound of the original part.

Frequently Asked Questions (FAQ)

Q: Can SMAJ170CA substitute for SMAJ170C in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (170V), package type (DO-214AC/SMA), mounting configuration (surface mount), and RoHS compliance. The 275V clamping voltage of SMAJ170CA is within acceptable design tolerance for general-purpose TVS applications.

Q: What is the difference between clamping voltage specifications across substitute parts?

A: Clamping voltage ranges from 275V to 304V across the substitute list. All values remain within the SMAJ170 series design envelope. Selection depends on circuit requirements for maximum transient voltage suppression. Higher clamping voltages (304V) provide additional margin but may increase component stress in lower-voltage transient events.

Q: Are all substitute parts available in tape and reel packaging?

A: Yes. All substitute parts are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

Q: Which substitute offers the best thermal performance?

A: SMAJ170CA-TP (Micro Commercial Co) extends the operating temperature range to -55°C ~ 175°C (TA), providing the highest upper temperature limit. SMAJ170CAE3/TR13 and SMAJ170CE3/TR13 maintain the original -65°C lower temperature bound with 500W peak pulse power capability.

Q: Is moisture sensitivity a consideration for PCB assembly?

A: All parts maintain MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or assembly processes.

Q: Can I use SMAJ170CE3/TR13 if my circuit requires higher clamping voltage tolerance?

A: Yes. SMAJ170CE3/TR13 specifies 304V maximum clamping voltage with 1.6A peak pulse current and 500W power dissipation, providing additional transient suppression margin compared to 275V alternatives.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message