SMBJE58AH Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMBJE58AH is an automotive-grade unidirectional transient voltage suppressor (TVS) diode manufactured by Eaton - Electronics Division. This surface mount component operates in the 58V reverse standoff voltage class and is designed for telecom applications requiring transient protection. The device is actively produced and maintains full AEC-Q101 automotive qualification with ROHS3 compliance. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for this critical protection component.

Substiute Parts

SMBJE58AH

Eaton - Electronics DivisionIn Stock: 4218SMBJE58AH Datasheet

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SM6T68AY

STMicroelectronicsIn Stock: 980SM6T68AY Datasheet

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SMBJ58A-Q

Bourns Inc.In Stock: 3404SMBJ58A-Q Datasheet

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SZ1SMB58AT3G

Littelfuse Inc.In Stock: 15279SZ1SMB58AT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes in the 58V reverse standoff voltage class is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Matching Parameters:

• Reverse standoff voltage within the 58V class (58V to 58.1V)
• Breakdown voltage minimum in the 64.4V to 64.6V range
• Clamping voltage at peak pulse current (93.6V to 121V)
• Peak pulse current rating (6.4A to 33A at specified pulse duration)
• Peak pulse power rating (600W)
• Surface mount package format (DO-214AA / SMB)
• Automotive grade with AEC-Q101 qualification
• Operating temperature range (-55°C to 150°C minimum)
• Unidirectional channel configuration

Substitute parts are grouped into two categories based on electrical performance alignment:

Group 1 - Direct Electrical Equivalents: Parts with matching clamping voltage (93.6V) and peak pulse current (6.4A to 6.5A). These provide pin-for-pin and functional equivalence.

Group 2 - Higher Performance Alternatives: Parts with elevated clamping voltage (121V) and significantly higher peak pulse current (33A). These provide enhanced transient suppression capability while maintaining voltage class compatibility.

Parameter Comparison

Engineering Selection Recommendations

SMBJ58A-Q (Bourns Inc.) is the primary direct substitute for SMBJE58AH. This part maintains identical electrical specifications including 58V reverse standoff voltage, 93.6V clamping voltage, and 6.5A peak pulse current. Both components share DO-214AA surface mount packaging, automotive grade qualification, and AEC-Q101 certification. The SMBJ58A-Q is actively produced with 3317 units in stock. REACH status differs (REACH Affected vs. REACH Unaffected), requiring verification for applications subject to REACH compliance requirements.

SZ1SMB58AT3G (Littelfuse Inc.) provides direct electrical equivalence with 58V reverse standoff voltage, 93.6V clamping voltage, and 6.4A peak pulse current matching the SMBJE58AH specification. This part offers extended lower operating temperature capability (-65°C minimum vs. -55°C) and includes capacitance specification (310pF @ 1MHz). Surface mount DO-214AA packaging, automotive grade, and AEC-Q101 qualification are maintained. Inventory availability is highest among substitutes at 15200 units.

SM6T68AY (STMicroelectronics) operates within the same 58V voltage class (58.1V reverse standoff) with compatible breakdown voltage (64.6V). This part features elevated clamping voltage (121V) and significantly higher peak pulse current (33A at 8/20µs pulse duration), providing enhanced transient suppression performance. The SM6T68AY maintains automotive grade, AEC-Q101 qualification, and DO-214AA surface mount packaging. This substitute is appropriate for applications requiring higher transient energy absorption capacity while remaining within the 58V protection voltage class.

All substitute parts maintain active product status, ROHS3 compliance, MSL 1 rating, and automotive-grade qualification. Selection between direct equivalents (SMBJ58A-Q, SZ1SMB58AT3G) and the higher-performance alternative (SM6T68AY) depends on circuit transient energy requirements and clamping voltage tolerance specifications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ58A-Q replace SMBJE58AH in existing designs without circuit modification?

A: Yes. SMBJ58A-Q provides direct electrical and mechanical equivalence with identical reverse standoff voltage (58V), clamping voltage (93.6V), and peak pulse current (6.5A). Both use DO-214AA surface mount packaging. Pin configuration and footprint are compatible. REACH compliance status differs and must be evaluated for specific applications.

Q: What is the difference between SZ1SMB58AT3G and SMBJE58AH?

A: SZ1SMB58AT3G matches SMBJE58AH in reverse standoff voltage (58V), breakdown voltage (64.4V), clamping voltage (93.6V), and peak pulse current (6.4A). The Littelfuse part extends the lower operating temperature to -65°C (versus -55°C) and includes capacitance specification. Both are DO-214AA surface mount packages with automotive AEC-Q101 qualification.

Q: When should SM6T68AY be selected instead of direct equivalents?

A: SM6T68AY is selected when circuit transient energy exceeds the 6.4A to 6.5A peak pulse current capability of direct equivalents. This STMicroelectronics part provides 33A peak pulse current and 121V clamping voltage, delivering five times higher current handling. The elevated clamping voltage must be acceptable within circuit design margins. Voltage class (58V standoff) remains compatible.

Q: Are all substitute parts automotive-grade with AEC-Q101 qualification?

A: Yes. SMBJ58A-Q, SZ1SMB58AT3G, and SM6T68AY all carry automotive grade designation and AEC-Q101 qualification, matching SMBJE58AH. All parts are ROHS3 compliant with MSL 1 moisture sensitivity rating.

Q: What packaging format do these TVS diodes use?

A: All parts use DO-214AA surface mount package, commonly designated as SMB. This package format is standard for 600W peak pulse power TVS diodes in the 58V voltage class and provides identical PCB footprint compatibility across all substitutes.

Q: Does operating temperature range affect substitution decisions?

A: SZ1SMB58AT3G extends the lower operating temperature limit to -65°C compared to -55°C for SMBJE58AH, SMBJ58A-Q, and SM6T68AY. For applications operating below -55°C, SZ1SMB58AT3G provides broader temperature coverage. For standard -55°C to 150°C range applications, all parts are equivalent.

Q: What inventory considerations apply to these substitutes?

A: SMBJE58AH has 4180 units in stock. SMBJ58A-Q provides 3317 units. SZ1SMB58AT3G offers the highest availability at 15200 units. SM6T68AY has 886 units available. Inventory levels support procurement flexibility across all four part options.