SMAJ8.0A-TP Equivalent & Substitute Parts

Part Overview

The SMAJ8.0A-TP is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component features an 8V reverse standoff voltage with a 13.6V maximum clamping voltage and 29.4A peak pulse current capability in a DO-214AC (SMA) package. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters to ensure functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8	V
Voltage - Breakdown (Min)	8.89	V
Voltage - Clamping (Max) @ Ipp	13.6	V
Current - Peak Pulse (10/1000µs)	29.4	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ8.0A-TP are qualified based on the following critical parameters that determine functional equivalence:

Electrical Parameters (Must Match):

Voltage - Reverse Standoff: 8V
Voltage - Breakdown (Min): 8.89V
Voltage - Clamping (Max) @ Ipp: 13.6V
Current - Peak Pulse (10/1000µs): 29.4A or equivalent
Power - Peak Pulse: 400W
Type: Zener, Unidirectional

Package & Mechanical Parameters (Must Match):

Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Unidirectional Channels: 1

Compliance & Status (Must Match):

Product Status: Active
RoHS Status: ROHS3 Compliant

Identified substitutes meet these criteria with allowable variations in operating temperature range and packaging format (Cut Tape vs. Tape & Reel), which do not affect electrical performance or circuit compatibility.

Parameter Comparison

Parameter	SMAJ8.0A-TP (Micro Commercial Co)	SMAJ8.0A (Meritek)	SMAJ8.0A-13-F (Diodes Incorporated)
Manufacturer	Micro Commercial Co	Meritek	Diodes Incorporated
Voltage - Reverse Standoff (Typ)	8V	8V	8V
Voltage - Breakdown (Min)	8.89V	8.89V	8.89V
Voltage - Clamping (Max) @ Ipp	13.6V	13.6V	13.6V
Current - Peak Pulse (10/1000µs)	29.4A	29.41A	29.4A
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-55 to 175°C	-55 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
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active
Packaging Format	Cut Tape (CT)	—	Tape & Reel (TR)

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and ROHS3 compliance, ensuring continued availability and regulatory conformance. The SMAJ8.0A from Meritek and SMAJ8.0A-13-F from Diodes Incorporated are electrically equivalent to the SMAJ8.0A-TP, with identical voltage and current specifications. Selection between these options depends on packaging requirements and supply chain considerations:

SMAJ8.0A-TP (Micro Commercial Co): Original specification with extended operating temperature range (-55 to 175°C) in Cut Tape packaging.
SMAJ8.0A (Meritek): Equivalent electrical performance with standard operating temperature range (-55 to 150°C).
SMAJ8.0A-13-F (Diodes Incorporated): Equivalent electrical performance supplied in Tape & Reel format, suitable for automated assembly processes.

All three parts are suitable for direct substitution in general-purpose transient voltage suppression applications where the specified electrical parameters and DO-214AC package are required.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.0A (Meritek) be used as a direct replacement for SMAJ8.0A-TP?

A: Yes. Both parts share identical voltage specifications (8V reverse standoff, 13.6V clamping), current ratings (29.4A peak pulse), and package format (DO-214AC SMA). The operating temperature range differs (-55 to 150°C vs. -55 to 175°C), which does not affect substitution in applications operating within the lower range.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging provides individual component strips suitable for manual handling and small-volume assembly. Tape & Reel (TR) packaging supplies components on continuous reels optimized for automated pick-and-place equipment. Both formats contain identical components; selection depends on assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SMAJ8.0A-TP, SMAJ8.0A (Meritek), and SMAJ8.0A-13-F (Diodes Incorporated) are all ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), meeting regulatory requirements for electronic component use.

Q: What determines whether a TVS diode can substitute for SMAJ8.0A-TP?

A: Functional substitution requires matching voltage specifications (8V reverse standoff, 8.89V breakdown minimum, 13.6V clamping maximum), current rating (29.4A peak pulse), package type (DO-214AC SMA), and unidirectional channel configuration (1 channel). Operating temperature range and packaging format (Cut Tape vs. Tape & Reel) are secondary considerations that do not affect electrical interchangeability.

Q: Can I use a higher voltage-rated TVS diode as a substitute?

A: No. Using a TVS diode with different voltage specifications will alter circuit protection characteristics and may result in inadequate overvoltage suppression or component failure. Substitution requires exact voltage matching as specified.

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