MSMBJ85CA Equivalent & Substitute Parts

Part Overview

The MSMBJ85CA is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with an 85V reverse standoff voltage and provides 137V maximum clamping voltage at peak pulse current. The component is housed in a DO-214AA (SMB) package and is qualified to MIL-PRF-19500 military standards.

The MSMBJ85CA maintains active product status with 843 units currently in stock. Identifying equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate alternative sourcing options while maintaining electrical and mechanical compatibility.

Substiute Parts

MSMBJ85CA

Microchip TechnologyIn Stock: 920MSMBJ85CA Datasheet

Current PartRFQ

SMBJ85CA-13

Diodes IncorporatedIn Stock: 4330SMBJ85CA-13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MSMBJ85CA are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Voltage - Reverse Standoff (Typ): 85V
• Voltage - Breakdown (Min): 94.4V
• Voltage - Clamping (Max) @ Ipp: 137V
• Current - Peak Pulse (10/1000µs): 4.4A
• Power - Peak Pulse: 600W
• Type: Zener
• Bidirectional Channels: 1

Mechanical Parameters (Must Match):

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount

Acceptable Variations:

• Operating Temperature Range: Substitute parts may have narrower temperature ranges provided the specified operating conditions fall within the substitute's range
• Product Status: Active or Discontinued parts with identical electrical and mechanical specifications are acceptable substitutes

Parameter Comparison

Engineering Selection Recommendations

The SMBJ85CA-13 manufactured by Diodes Incorporated is a direct electrical and mechanical equivalent to the MSMBJ85CA. Both components share identical voltage ratings, peak pulse current specifications, and power dissipation characteristics. Both are housed in the DO-214AA (SMB) surface-mount package and are classified as Zener-type bidirectional TVS diodes.

Product Status Consideration: The SMBJ85CA-13 is listed as discontinued at DiGi Electronics. While the part maintains electrical equivalence, procurement availability may be limited through standard distribution channels. The MSMBJ85CA remains in active production with 843 units in current inventory.

Temperature Range Consideration: The MSMBJ85CA operates across -65°C to 150°C, while the SMBJ85CA-13 operates across -55°C to 150°C. The substitute part has a narrower lower temperature limit. Applications requiring operation below -55°C must use the MSMBJ85CA.

Compliance and Certification: Both parts carry identical regulatory classifications: RoHS non-compliant, REACH Unaffected, ECCN EAR99, and HTSUS 8541.10.0080. The MSMBJ85CA holds MIL-PRF-19500 military qualification; this certification is not specified for the SMBJ85CA-13. Applications requiring military-grade qualification must specify the MSMBJ85CA.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ85CA-13 replace the MSMBJ85CA in all applications?

A: The SMBJ85CA-13 provides electrical and mechanical equivalence for applications operating within -55°C to 150°C. Applications requiring operation below -55°C or military-grade qualification (MIL-PRF-19500) must use the MSMBJ85CA.

Q: Are the DO-214AA and SMB package designations interchangeable?

A: Yes. DO-214AA and SMB refer to the same physical package format. Both the MSMBJ85CA and SMBJ85CA-13 use this identical package, ensuring mechanical compatibility in PCB layouts and assembly processes.

Q: What is the significance of the voltage ratings in TVS diode selection?

A: The reverse standoff voltage (85V) defines the normal operating threshold. The breakdown voltage (94.4V minimum) establishes the point at which the diode begins conducting. The clamping voltage (137V maximum) represents the maximum voltage the diode allows across the protected circuit during a transient event. All three parameters must match for substitution eligibility.

Q: Does the peak pulse current rating affect substitution compatibility?

A: Yes. The peak pulse current (4.4A at 10/1000µs) and power dissipation (600W) define the transient energy the diode can safely absorb. Substitute parts must match these specifications exactly to ensure equivalent protection performance and thermal management.

Q: What does RoHS non-compliant status mean for component selection?

A: RoHS non-compliant indicates the component may contain restricted substances such as lead. Both the MSMBJ85CA and SMBJ85CA-13 share this classification. Applications subject to RoHS regulations must verify compliance requirements with system-level design specifications.

Q: How does moisture sensitivity level (MSL) affect handling and storage?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These components do not require special dry-pack storage or baking procedures prior to assembly, simplifying procurement and inventory management.