SMBJ85A-HR Equivalent & Substitute Parts

Part Overview

The SMBJ85A-HR is an 85V Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This unidirectional Zener diode features a 137V maximum clamping voltage, 4.4A peak pulse current capability, and 600W peak pulse power rating in a surface-mount DO-214AA (SMB) package. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and operational parameters within the SMBJ85 series.

Substiute Parts

SMBJ85A-HR

Littelfuse Inc.In Stock: 3519SMBJ85A-HR Datasheet

Current PartRFQ

SMBJ85A

MeritekIn Stock: 2164SMBJ85A Datasheet

DirectRFQ

SMBJ85A

MeritekIn Stock: 2164SMBJ85A Datasheet

DirectRFQ

SMBJ85A-13-F

Diodes IncorporatedIn Stock: 4424SMBJ85A-13-F Datasheet

DirectRFQ

SMBJ85A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 45289SMBJ85A-E3/52 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMBJ85A-HR are qualified based on the following criteria:

Electrical Parameter Matching:

• Voltage - Reverse Standoff (Typ): 85V
• Voltage - Breakdown (Min): 94.4V
• Voltage - Clamping (Max) @ Ipp: 137V
• Current - Peak Pulse (10/1000µs): 4.4A (or within 0.02A tolerance)
• Power - Peak Pulse: 600W

Package & Mechanical Compatibility:

• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Compliance & Environmental:

• Type: Zener
• Applications: General Purpose
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain these core specifications and are suitable for direct replacement in applications requiring 85V TVS protection.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original SMBJ85A-HR specification. Selection among these equivalents should be based on:

Inventory Availability: SMBJ85A-E3/52 (Vishay) offers the highest stock level at 45,200 pieces, followed by SMBJ85A-13-F (Diodes Inc.) at 4,344 pieces, SMBJ85A-HR (Littelfuse) at 3,435 pieces, and SMBJ85A (Meritek) at 2,060 pieces.

Temperature Range Consideration: The SMBJ85A-HR supports an extended lower operating temperature of -65°C compared to -55°C for all substitute parts. Applications requiring operation below -55°C must retain the original Littelfuse part.

Peak Pulse Current: SMBJ85A (Meritek) specifies 4.38A peak pulse current, which is 0.02A lower than the 4.4A rating of other parts. This minor variance remains within typical component tolerance ranges for this device category.

Packaging: All parts are supplied in DO-214AA (SMB) surface-mount packages with identical mechanical footprints, ensuring PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ85A (Meritek) be used as a direct replacement for SMBJ85A-HR?

A: Yes. The Meritek part matches all critical electrical parameters: 85V reverse standoff voltage, 94.4V minimum breakdown voltage, 137V maximum clamping voltage, and 600W peak pulse power. The 4.38A peak pulse current specification is within acceptable tolerance for this device class. Both parts are ROHS3 compliant with MSL 1 rating. Operating temperature range differs (-55°C to 150°C vs. -65°C to 150°C); applications requiring sub-55°C operation must use the original part.

Q: What is the difference between SMBJ85A-13-F and SMBJ85A-E3/52?

A: Both parts are electrically equivalent with identical voltage ratings (85V standoff, 94.4V breakdown, 137V clamping) and current specifications (4.4A peak pulse). SMBJ85A-13-F is manufactured by Diodes Incorporated with 4,344 pieces in stock. SMBJ85A-E3/52 is manufactured by Vishay with significantly higher inventory (45,200 pieces) and carries the TransZorb® series designation. Both support -55°C to 150°C operating temperature and are ROHS3 compliant.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All parts use the DO-214AA (SMB) surface-mount package with identical mechanical dimensions and pin configuration. No PCB layout modifications are required for substitution.

Q: Which substitute part should be selected for high-volume production?

A: SMBJ85A-E3/52 (Vishay) is recommended for high-volume applications due to the largest available inventory (45,200 pieces) and established supply chain. All electrical and compliance specifications match the original SMBJ85A-HR.

Q: Does operating temperature range affect substitution eligibility?

A: The SMBJ85A-HR supports -65°C to 150°C, while all substitute parts support -55°C to 150°C. For applications operating below -55°C, the original Littelfuse part must be retained. For applications within -55°C to 150°C range, all substitutes are suitable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification with MSL 1 (Unlimited) moisture sensitivity rating, matching the original SMBJ85A-HR specification.