SMBJE8-5AH Equivalent & Substitute Parts

Part Overview

The SMBJE8-5AH is an active Transient Voltage Suppressor (TVS) diode manufactured by Eaton - Electronics Division. This unidirectional zener device operates in the 8.5V reverse standoff voltage range and is designed for surface mount applications in the DO-214AA (SMB) package. The device is qualified to AEC-Q101 automotive standards and is ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring TVS protection in the specified voltage and current rating range.

Substiute Parts

SMBJE8-5AH

Eaton - Electronics DivisionIn Stock: 906SMBJE8-5AH Datasheet

Current PartRFQ

SM6T10AY

STMicroelectronicsIn Stock: 3405SM6T10AY Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJE8-5AH is determined by the following critical electrical and mechanical parameters:

Voltage Parameters: The reverse standoff voltage (8.5V typical) and breakdown voltage (9.44V minimum) establish the protection threshold. Substitute parts must maintain equivalent or tighter voltage specifications to ensure consistent transient suppression performance.

Current and Power Ratings: The peak pulse current (41.7A at 10/1000µs) and peak pulse power (600W) define the energy dissipation capability. Substitute parts must support equivalent or higher current and power ratings to handle the same transient events.

Package and Mounting: The DO-214AA (SMB) surface mount package is a mechanical requirement for PCB compatibility. All substitute parts must use identical or functionally equivalent packaging.

Environmental and Compliance Requirements: Operating temperature range (-55°C to 150°C), automotive grade classification, AEC-Q101 qualification, ROHS3 compliance, and MSL 1 rating are mandatory for equivalent substitution in automotive and regulated applications.

Pulse Duration Specification: The 10/1000µs pulse waveform defines the test condition for current and voltage ratings. Substitute parts may use alternative pulse specifications (such as 8/20µs) provided the electrical performance remains compatible with the application requirements.

Parameter Comparison

Engineering Selection Recommendations

SMBJE8-5AH (Eaton - Electronics Division): This part is the primary reference device. It is active, AEC-Q101 qualified, and ROHS3 compliant. The device is suitable for automotive and telecom applications requiring 8.5V standoff protection with 41.7A peak pulse current capability in the 10/1000µs waveform.

SM6T10AY (STMicroelectronics): This substitute part is active, AEC-Q101 qualified, and ROHS3 compliant. It provides equivalent reverse standoff voltage (8.55V) and breakdown voltage (9.5V) specifications. The clamping voltage is higher at 18.6V, and the peak pulse current specification uses an 8/20µs waveform with 215A rating. Both devices share identical operating temperature range, package type, and compliance certifications. The SM6T10AY is suitable for applications where higher current handling capacity or alternative pulse waveform specifications are acceptable within the design constraints.

Both parts are automotive-grade, AEC-Q101 qualified, and meet ROHS3 and REACH compliance requirements. Selection between these devices depends on specific application requirements regarding clamping voltage tolerance and peak pulse current specifications.

Frequently Asked Questions (FAQ)

Q: Can the SM6T10AY directly replace the SMBJE8-5AH in all applications?

A: Both devices share the same reverse standoff voltage (8.5V typical), breakdown voltage (9.5V minimum), operating temperature range, package type, and automotive qualifications. However, the SM6T10AY has a higher clamping voltage (18.6V versus 14.4V) and uses a different pulse waveform specification (8/20µs versus 10/1000µs). Direct substitution is valid only when the application circuit can tolerate the higher clamping voltage and the alternative pulse specification does not affect performance requirements.

Q: What is the significance of the different pulse waveform specifications (10/1000µs versus 8/20µs)?

A: The pulse waveform specification defines the test conditions under which current and voltage ratings are measured. The 10/1000µs waveform represents a slower transient event, while the 8/20µs waveform represents a faster transient. Both devices are rated at 600W peak pulse power, but the current ratings differ due to the different pulse durations. Application requirements determine which waveform specification is appropriate.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SMBJE8-5AH and SM6T10AY are automotive-grade devices with AEC-Q101 qualification. Both are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity ratings, making them suitable for automotive and regulated industrial applications.

Q: What is the package compatibility between these parts?

A: Both devices use the DO-214AA (SMB) surface mount package. They are mechanically and electrically compatible for PCB mounting and soldering processes. No package adapter or modification is required for substitution.

Q: How do the voltage specifications compare between the two parts?

A: The reverse standoff voltages are nearly identical (8.5V versus 8.55V). The breakdown voltages are also very close (9.44V versus 9.5V). The primary difference is the clamping voltage: the SMBJE8-5AH clamps at 14.4V maximum, while the SM6T10AY clamps at 18.6V maximum. This difference affects the maximum voltage that the protected circuit will experience during a transient event.

Q: What compliance certifications apply to both parts?

A: Both parts are AEC-Q101 qualified, ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8541.10.0080. Both have MSL 1 (Unlimited) moisture sensitivity ratings.