SMAJ170A-13 Equivalent & Substitute Parts

Part Overview

The SMAJ170A-13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose transient voltage protection in surface-mount applications. The device features a 170V reverse standoff voltage with 275V maximum clamping voltage and 1.4A peak pulse current capability in a DO-214AC (SMA) package. This part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	170	V
Voltage - Breakdown (Min)	189	V
Voltage - Clamping (Max) @ Ipp	275	V
Current - Peak Pulse (10/1000µs)	1.4	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ170A-13 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 170V
Voltage - Breakdown (Min): 189V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
Unidirectional Channels: 1

Substitute parts must maintain identical reverse standoff voltage, breakdown voltage minimum, and package configuration to ensure direct mechanical and electrical compatibility. Peak pulse current and clamping voltage may vary within acceptable design margins for the application category (general-purpose transient suppression).

Parameter Comparison

Parameter	SMAJ170A-13 (Diodes Inc.)	SMAJ170A (MDD)	SMAJ170A-TR (STMicroelectronics)
Manufacturer	Diodes Incorporated	MDD	STMicroelectronics
Voltage - Reverse Standoff (Typ)	170V	170V	170V
Voltage - Breakdown (Min)	189V	189V	189V
Voltage - Clamping (Max) @ Ipp	275V	275V	353V
Current - Peak Pulse (10/1000µs)	1.4A	1.50A	6.5A (8/20µs)
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-55 to 150°C	-50 to 150°C	-55 to 150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Availability	1072 Pcs	45400 Pcs	25100 Pcs

Engineering Selection Recommendations

Both SMAJ170A (MDD) and SMAJ170A-TR (STMicroelectronics) are electrically and mechanically compatible substitutes for the SMAJ170A-13.

SMAJ170A (MDD) provides the closest electrical match with identical clamping voltage (275V) and comparable peak pulse current (1.50A vs. 1.4A). This part is ROHS3 compliant and maintains the same thermal operating range as the original, with significantly higher inventory availability (45,400 pcs).

SMAJ170A-TR (STMicroelectronics) offers enhanced performance characteristics with higher peak pulse current (6.5A at 8/20µs) and elevated clamping voltage (353V). This part is also ROHS3 compliant and supports the full original operating temperature range (-55 to 150°C). The higher current rating provides additional design margin for transient suppression applications.

Both substitutes are available from active product lines with established supply chains, addressing the discontinuation status of the original part.

Frequently Asked Questions (FAQ)

Q: Can SMAJ170A (MDD) be used as a direct replacement for SMAJ170A-13?

A: Yes. Both parts share identical reverse standoff voltage (170V), breakdown voltage (189V minimum), and DO-214AC SMA package configuration. The 1.50A peak pulse current of the MDD variant exceeds the original 1.4A specification, providing compatible performance for general-purpose transient suppression applications.

Q: What are the differences between SMAJ170A (MDD) and SMAJ170A-TR (STMicroelectronics)?

A: The primary differences are peak pulse current (1.50A vs. 6.5A) and clamping voltage (275V vs. 353V). Both maintain the same reverse standoff voltage and package format. The STMicroelectronics variant provides higher transient energy absorption capability.

Q: Are there temperature range considerations when substituting?

A: SMAJ170A (MDD) operates from -50 to 150°C, which is 5°C narrower at the lower end compared to the original -55 to 150°C range. SMAJ170A-TR (STMicroelectronics) matches the full original temperature range (-55 to 150°C). Verify application requirements before selection.

Q: Do the substitute parts meet RoHS compliance requirements?

A: Yes. Both SMAJ170A (MDD) and SMAJ170A-TR (STMicroelectronics) are ROHS3 compliant, whereas the original SMAJ170A-13 is non-compliant. This addresses regulatory requirements for new designs and procurement.

Q: Are the substitute parts available in the same packaging format?

A: Yes. All three parts use DO-214AC (SMA) surface-mount packages. The MDD variant is supplied in Tape & Reel (TR) format, and the STMicroelectronics part is also supplied in Tape & Reel format, both suitable for automated assembly processes.

Q: Which substitute should be selected for new designs?

A: Selection depends on application transient energy requirements. For equivalent performance to the original design, SMAJ170A (MDD) is appropriate. For applications requiring higher transient current handling, SMAJ170A-TR (STMicroelectronics) provides enhanced capability. Both are active products with established supply availability.

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