Equivalent & Substitute Parts for 189NQ135

Part Overview

The 189NQ135 is a Schottky diode rated for 135V DC reverse voltage and 180A average rectified current, housed in a D-67 HALF-PAK chassis mount package. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability. The part exhibits fast recovery characteristics with a maximum forward voltage of 1.07V at 180A and reverse leakage current of 4.5mA at rated voltage.

Substiute Parts

189NQ135

Vishay General Semiconductor - Diodes DivisionIn Stock: 1046189NQ135 Datasheet

Current PartRFQ

189NQ135-1

SMC Diode SolutionsIn Stock: 985189NQ135-1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 189NQ135 is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical):

• Voltage - DC Reverse (Vr) (Max): 135V
• Current - Average Rectified (Io): 180A
• Voltage - Forward (Vf) (Max) @ If: 1.07V @ 180A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 4.5mA @ 135V
• Capacitance @ Vr, F: 4500pF @ 5V, 1MHz

Mechanical Parameters (Critical):

• Technology: Schottky
• Mounting Type: Chassis Mount
• Package / Case: HALF-PAK configuration

The 189NQ135-1 manufactured by SMC Diode Solutions satisfies all electrical and mechanical equivalence criteria. Both parts maintain identical voltage, current, and thermal characteristics while utilizing compatible HALF-PAK chassis mount packaging. The primary distinction is product status: the original part is obsolete while the substitute is active in production.

Parameter Comparison

Engineering Selection Recommendations

The 189NQ135-1 from SMC Diode Solutions is the direct equivalent substitute for the obsolete 189NQ135. Selection of this substitute is based on the following engineering factors:

Product Status: The original 189NQ135 is classified as obsolete. The 189NQ135-1 maintains active production status, ensuring long-term supply chain availability and manufacturing support.

Regulatory Compliance: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings (MSL 1 - Unlimited), confirming compatibility with current environmental and manufacturing standards.

Electrical and Mechanical Equivalence: All critical parameters—voltage rating, current capacity, forward voltage drop, recovery speed, reverse leakage, and capacitance—are identical between the two parts. Chassis mount HALF-PAK packaging is maintained, ensuring mechanical compatibility with existing circuit board layouts and thermal management designs.

Certification Alignment: Both components carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications, confirming regulatory equivalence for procurement and export purposes.

Frequently Asked Questions (FAQ)

Q: Can the 189NQ135-1 be used as a direct replacement for the 189NQ135?

A: Yes. The 189NQ135-1 is electrically and mechanically equivalent to the 189NQ135 across all specified parameters. Both parts are Schottky diodes with 135V reverse voltage rating, 180A average rectified current, and identical forward voltage, reverse leakage, and capacitance characteristics. Both utilize HALF-PAK chassis mount packaging.

Q: What is the primary reason for substitution?

A: The 189NQ135 is classified as obsolete. The 189NQ135-1 is an active production equivalent that provides continued supply availability and manufacturing support.

Q: Are there any differences in package dimensions or mounting requirements?

A: Both parts utilize HALF-PAK chassis mount packaging. The 189NQ135-1 is designated as PRM1-1 (Half Pak Module) by the manufacturer. No changes to mounting configuration or thermal interface requirements are necessary.

Q: Do both parts meet current environmental compliance standards?

A: Yes. Both the 189NQ135 and 189NQ135-1 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, confirming compatibility with current manufacturing and environmental standards.

Q: Are the electrical performance characteristics identical?

A: Yes. Forward voltage drop (1.07V @ 180A), reverse leakage current (4.5mA @ 135V), capacitance (4500pF @ 5V, 1MHz), and recovery speed (Fast Recovery ≤ 500ns, > 200mA) are identical between both parts.

Q: What is the inventory status of the substitute part?

A: The 189NQ135-1 has 897 pieces in stock as new original inventory, ensuring immediate availability for procurement.