Equivalent & Substitute Parts for 181NQ040

Part Overview

The 181NQ040 is a Schottky diode rated for 40 V DC reverse voltage and 180 A average rectified current, housed in a D-67 HALF-PAK chassis mount package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Locating equivalent and substitute parts is necessary due to the obsolete product status and potential supply constraints. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and mounting requirements.

Substiute Parts

181NQ040

Vishay General Semiconductor - Diodes DivisionIn Stock: 1081181NQ040 Datasheet

Current PartRFQ

180NQ040-1

SMC Diode SolutionsIn Stock: 1017180NQ040-1 Datasheet

MFR RecommendedRFQ

181NQ040-1

SMC Diode SolutionsIn Stock: 1159181NQ040-1 Datasheet

MFR RecommendedRFQ

HS18140

Microsemi CorporationIn Stock: 672HS18140 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 181NQ040 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 180 A
• Technology: Schottky
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Equivalence Criteria:

• Mounting Type: Chassis Mount
• Package / Case: HALF-PAK variants (D-67 HALF-PAK, PRM1-1 Half Pak Module)

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed maintain these core parameters. Variations in forward voltage (Vf), reverse leakage current, capacitance, and operating temperature ranges are within acceptable tolerances for this component category and do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

180NQ040-1 (SMC Diode Solutions)

The 180NQ040-1 is an active product from SMC Diode Solutions with full ROHS3 compliance. This substitute maintains all critical electrical parameters: 40 V reverse voltage, 180 A average rectified current, and fast recovery Schottky technology. The forward voltage is 60 mV lower (600 mV vs. 660 mV), which represents improved efficiency characteristics. The part is housed in a PRM1-1 Half Pak Module package, mechanically compatible with the original D-67 HALF-PAK. Active product status ensures ongoing availability and supply chain stability.

181NQ040-1 (SMC Diode Solutions)

The 181NQ040-1 is an active product from SMC Diode Solutions with full ROHS3 compliance. This substitute provides exact electrical equivalence to the main part: 40 V reverse voltage, 180 A average rectified current, 660 mV forward voltage, and fast recovery Schottky technology. The part is housed in a PRM1-1 Half Pak Module package, mechanically compatible with the original D-67 HALF-PAK. Operating temperature range extends to 175°C. Active product status ensures ongoing availability.

HS18140 (Microsemi Corporation)

The HS18140 is an obsolete product from Microsemi Corporation with ROHS3 compliance. This substitute maintains all critical electrical parameters: 40 V reverse voltage, 180 A average rectified current, and fast recovery Schottky technology. The forward voltage is 40 mV higher (700 mV vs. 660 mV). Reverse leakage current is significantly lower at 4 mA. The part is housed in a HALF-PAK package, mechanically compatible with the original. Obsolete product status may limit future availability.

Frequently Asked Questions (FAQ)

Q: Can the 180NQ040-1 be used as a direct replacement for the 181NQ040?

A: The 180NQ040-1 meets all electrical equivalence criteria: 40 V reverse voltage, 180 A average rectified current, fast recovery Schottky technology, and chassis mount HALF-PAK packaging. The forward voltage is 60 mV lower, which is within acceptable tolerance for this component category. Mechanical compatibility is confirmed through HALF-PAK package equivalence.

Q: What is the difference between the 180NQ040-1 and 181NQ040-1?

A: Both parts are active products from SMC Diode Solutions with identical voltage and current ratings. The primary difference is forward voltage: 180NQ040-1 operates at 600 mV while 181NQ040-1 operates at 660 mV (matching the original 181NQ040). The 181NQ040-1 also supports a higher maximum operating temperature of 175°C compared to the 180NQ040-1. Both are housed in PRM1-1 Half Pak Module packages.

Q: Is the HS18140 suitable for new designs?

A: The HS18140 is classified as obsolete. While it meets all electrical and mechanical equivalence criteria for substitution, its obsolete status may result in limited availability and supply chain constraints. For new designs, active products such as 180NQ040-1 or 181NQ040-1 are preferred.

Q: Are there package compatibility concerns between D-67 HALF-PAK and PRM1-1 Half Pak Module?

A: Both packages are HALF-PAK variants designed for chassis mount applications with identical electrical and thermal performance characteristics. Mechanical mounting interfaces are compatible for this component category.

Q: What is the impact of forward voltage variation among substitutes?

A: Forward voltage variations (600 mV to 700 mV) affect power dissipation and thermal performance but do not impact electrical compatibility or circuit functionality. The 180NQ040-1 with lower forward voltage (600 mV) provides improved efficiency, while the HS18140 with higher forward voltage (700 mV) results in slightly higher power dissipation.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The 180NQ040-1 and 181NQ040-1 are REACH Affected, while the main part 181NQ040 and HS18140 are REACH Unaffected. Compliance status should be verified against specific regulatory requirements for your application.

Q: What is the reverse leakage current difference between HS18140 and other substitutes?

A: The HS18140 exhibits significantly lower reverse leakage current at 4 mA compared to 15 mA for the 181NQ040, 180NQ040-1, and 181NQ040-1. This lower leakage may be advantageous in applications sensitive to reverse current characteristics.