SMAJ8.5A-13 Equivalent & Substitute Parts

Part Overview

The SMAJ8.5A-13 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in the DO-214AC (SMA) surface mount package. This component is designed for general-purpose transient voltage suppression with an 8.5V reverse standoff voltage and 14.4V maximum clamping voltage at peak pulse current. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	8.5V
Voltage - Breakdown (Min)	9.44V
Voltage - Clamping (Max) @ Ipp	14.4V
Current - Peak Pulse (10/1000µs)	27.7A
Power - Peak Pulse	400W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution of the SMAJ8.5A-13 is determined by the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 8.5V ±tolerance and breakdown voltage minimum of 9.44V
Clamping Voltage: Maximum clamping voltage at Ipp must not exceed 14.4V to maintain circuit protection integrity
Peak Pulse Current: Minimum 27.7A at 10/1000µs pulse profile
Power Dissipation: 400W peak pulse power rating
Package Compatibility: DO-214AC (SMA) surface mount package for PCB layout compatibility
Temperature Range: Operating range of -55°C to 150°C minimum

Substitute parts are grouped into two categories:

Direct Electrical Equivalents maintain identical or near-identical electrical specifications with the same package, differing only in manufacturer, product status, or packaging format.

Functional Equivalents meet the core voltage and current requirements within acceptable engineering tolerances but may have minor variations in clamping voltage, peak pulse current, or temperature range that remain suitable for the application.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Product Status	RoHS Status
SMAJ8.5A-13	Diodes Incorporated	8.5V	9.44V	14.4V	27.7A	400W	DO-214AC, SMA	Discontinued	RoHS non-compliant
SMAJ8.5A-13-F	Diodes Incorporated	8.5V	9.44V	14.4V	27.7A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ8.5A-E3/61	Vishay General Semiconductor - Diodes Division	8.5V	9.44V	14.4V	27.8A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ8.5A	Meritek	8.5V	9.44V	14.4V	27.78A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ8.5A-TP	Micro Commercial Co	8.5V	9.44V	14.4V	27.7A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
P4SMA10A	Eaton - Electronics Division	8.55V	9.5V	14.5V	28.3A	400W	DO-214AC, SMA	Active	RoHS Compliant
PTVS8V5S1UR,115	Nexperia USA Inc.	8.5V	9.44V	14.4V	27.8A	400W	SOD-123W	Active	ROHS3 Compliant
SM4T10AY	STMicroelectronics	8.5V	9.4V	19.5V	124A (8/20µs)	400W	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J8.5A-TR	STMicroelectronics	8.5V	9.4V	18.7V	205A (8/20µs)	600W	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SMAJ8.5A-13-F

The SMAJ8.5A-13-F is the direct successor to the SMAJ8.5A-13, manufactured by Diodes Incorporated with identical electrical specifications. This part maintains 100% pin and functional compatibility while offering ROHS3 compliance and active product status. It is available in Cut Tape and Digi-Reel packaging formats with substantial inventory (28,646 units).

Secondary Recommendations: SMAJ8.5A-E3/61, SMAJ8.5A, SMAJ8.5A-TP

These parts provide direct electrical equivalence with the original specification:

SMAJ8.5A-E3/61 (Vishay) offers the TransZorb series designation with 27.8A peak pulse current and extended temperature range to 175°C
SMAJ8.5A (Meritek) provides the highest inventory availability (122,800 units) with 27.78A peak pulse current
SMAJ8.5A-TP (Micro Commercial Co) maintains exact electrical parameters with extended temperature range to 175°C

All three are ROHS3 compliant with active product status.

Alternative Consideration: P4SMA10A

The P4SMA10A (Eaton) presents a functional equivalent with minor parameter variations: 8.55V reverse standoff, 9.5V breakdown minimum, and 14.5V clamping voltage. Peak pulse current is 28.3A, exceeding the original specification. This part is suitable where slight voltage tolerance increases are acceptable.

Package Variant: PTVS8V5S1UR,115

The PTVS8V5S1UR,115 (Nexperia) provides electrical equivalence but uses the SOD-123W package instead of DO-214AC (SMA). This part is not recommended as a direct substitute due to package incompatibility with existing PCB layouts. It is suitable only for new designs where the smaller SOD-123W footprint is preferred. This part includes AEC-Q101 automotive qualification.

Not Recommended for Direct Substitution: SM4T10AY, SMA6J8.5A-TR

The SM4T10AY and SMA6J8.5A-TR are higher-performance variants with significantly elevated clamping voltages (19.5V and 18.7V respectively) and substantially higher peak pulse currents (124A and 205A). These parts exceed the original specification and are suitable only for applications requiring enhanced transient suppression capability, not as direct replacements.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.5A-13-F be used as a direct replacement for SMAJ8.5A-13?

A: Yes. The SMAJ8.5A-13-F is electrically and mechanically identical to the SMAJ8.5A-13, with the primary difference being ROHS3 compliance and active product status. It is the recommended direct replacement.

Q: What is the difference between the various SMAJ8.5A part numbers?

A: The SMAJ8.5A series from different manufacturers (Diodes Incorporated, Vishay, Meritek, Micro Commercial Co) share identical core electrical specifications: 8.5V reverse standoff, 9.44V breakdown minimum, and 14.4V clamping voltage. Differences exist in manufacturer, packaging format (tape & reel vs. cut tape), temperature range extensions, and inventory availability. All are electrically interchangeable.

Q: Why is the PTVS8V5S1UR,115 not recommended as a direct substitute?

A: The PTVS8V5S1UR,115 uses the SOD-123W package, which has a different footprint and pinout compared to the DO-214AC (SMA) package of the original part. Direct substitution on existing PCBs is not possible without layout modification. This part is suitable only for new designs.

Q: Can SM4T10AY or SMA6J8.5A-TR replace the SMAJ8.5A-13?

A: These parts are not direct replacements. They feature higher clamping voltages (19.5V and 18.7V) and significantly higher peak pulse currents (124A and 205A at 8/20µs pulse profile). They are suitable only for applications requiring enhanced transient suppression beyond the original specification.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, restricting the use of specific hazardous materials in electrical and electronic equipment. The original SMAJ8.5A-13 is RoHS non-compliant, while all active substitutes listed are ROHS3 compliant, making them suitable for applications with environmental or regulatory requirements.

Q: Is there a difference in performance between Diodes Incorporated, Vishay, and Meritek versions?

A: All three manufacturers produce parts meeting the same electrical specification. Vishay's SMAJ8.5A-E3/61 offers extended temperature range to 175°C. Meritek's SMAJ8.5A provides the highest inventory availability. Selection should be based on availability, lead time, and specific application temperature requirements.

Q: What packaging formats are available for the SMAJ8.5A series?

A: The SMAJ8.5A series is available in Tape & Reel (TR) and Cut Tape (CT) formats. The SMAJ8.5A-13-F is available in both Cut Tape and Digi-Reel formats. Packaging selection depends on production volume and assembly equipment compatibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message