MD1690A-BM2MM Equivalent & Substitute Parts

Part Overview

The MD1690A-BM2MM is a diode module manufactured by Littelfuse Inc., classified as a rectifier diode array with 1 pair series connection configuration. This component is rated for 1600 V DC reverse voltage and 90 A average rectified current per diode, designed for chassis mount applications in the A-3 module package. The product is currently obsolete, necessitating identification of active equivalent components to maintain system functionality and ensure continued availability for new designs and repairs.

Substiute Parts

MD1690A-BM2MM

Littelfuse Inc.In Stock: 1355MD1690A-BM2MM Datasheet

Current PartRFQ

MDMA85P1600TG

IXYSIn Stock: 921MDMA85P1600TG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MD1690A-BM2MM is determined by strict equivalence across the following critical parameters:

Voltage Rating: The substitute must maintain 1600 V DC reverse voltage (Vr) maximum to ensure dielectric integrity in the application circuit.

Diode Configuration: The substitute must preserve the 1 Pair Series Connection configuration to maintain circuit topology and current distribution characteristics.

Current Rating: The substitute current rating must be compatible with the application's maximum current requirements. The MD1690A-BM2MM is rated at 90 A average rectified current per diode.

Recovery Speed: The substitute must maintain Standard Recovery characteristics (>500ns, > 200mA Io) to ensure switching performance consistency.

Operating Temperature Range: The substitute must support the -40°C ~ 150°C junction temperature range.

Mounting Type: The substitute must be chassis mount to ensure mechanical compatibility with the application.

Compliance: The substitute must maintain ROHS3 compliance and MSL 1 rating for environmental and handling requirements.

The MDMA85P1600TG from IXYS meets these substitution criteria with the exception of current rating, which is specified at 85 A versus the original 90 A. This represents a 5.6% reduction in current capacity and must be evaluated against application requirements.

Parameter Comparison

Engineering Selection Recommendations

The MDMA85P1600TG is an active product from IXYS and represents the manufacturer-recommended substitute for the obsolete MD1690A-BM2MM. Both components maintain identical voltage ratings (1600 V), diode configuration (1 Pair Series Connection), recovery speed characteristics, and operating temperature range (-40°C ~ 150°C). Both are ROHS3 compliant with MSL 1 rating.

The primary difference is the current rating: the MDMA85P1600TG is rated at 85 A versus the original 90 A specification. This 5.6% reduction in current capacity must be verified against the application's actual operating current to determine suitability. If the application operates at or below 85 A average rectified current, the MDMA85P1600TG is functionally equivalent.

The package change from A-3 Module to TO-240AA requires mechanical re-evaluation of the mounting interface and thermal management design. The MDMA85P1600TG also exhibits lower reverse leakage current (200 µA versus 500 µA at 1600 V), which represents improved performance in this parameter.

Frequently Asked Questions (FAQ)

Q: Can the MDMA85P1600TG directly replace the MD1690A-BM2MM without circuit modification?

A: Electrical substitution is possible if the application's maximum average rectified current does not exceed 85 A. The voltage rating, diode configuration, and recovery speed are identical. However, the package change from A-3 Module to TO-240AA requires mechanical re-evaluation of the mounting interface and may require PCB layout modifications.

Q: What is the significance of the current rating difference (90 A vs. 85 A)?

A: The MDMA85P1600TG has a 5.6% lower current rating. If the application operates at average rectified currents below 85 A, this difference is not limiting. If the application requires the full 90 A capacity, the MDMA85P1600TG is not suitable without circuit redesign to reduce current demand.

Q: Are there thermal management differences between these components?

A: The forward voltage characteristics differ (1.6 V @ 280 A for MD1690A-BM2MM versus 1.17 V @ 85 A for MDMA85P1600TG). Direct thermal comparison requires evaluation at identical operating currents, which is not provided in the specifications. The package change may also affect thermal dissipation characteristics.

Q: Does the package change affect compliance or certifications?

A: Both components maintain ROHS3 compliance and MSL 1 rating. The package change does not affect these certifications. However, the mechanical interface change requires verification that the TO-240AA package is compatible with the application's mounting structure and thermal management design.

Q: What is the reverse leakage current difference?

A: The MDMA85P1600TG exhibits 200 µA reverse leakage at 1600 V, compared to 500 µA for the MD1690A-BM2MM. This represents improved leakage performance in the substitute component.

Q: Is the MDMA85P1600TG the only available substitute?

A: According to the provided data, MDMA85P1600TG is the manufacturer-recommended substitute. No additional alternatives are specified in the reference materials.