Equivalent & Substitute Parts for 181NQ045

Part Overview

The 181NQ045 is a Schottky diode rated for 45 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. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for new production and field replacements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	45 V
Current - Average Rectified (Io)	180 A
Voltage - Forward (Vf) (Max) @ If	660 mV @ 180 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	15 mA @ 45 V
Capacitance @ Vr, F	7800 pF @ 5V, 1MHz
Mounting Type	Chassis Mount
Package / Case	D-67 HALF-PAK
Technology	Schottky
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 181NQ045 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 45 V
Current - Average Rectified (Io): 180 A
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 15 mA @ 45 V

Mechanical Parameters (Must Match):

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

Compliance Parameters (Must Match):

RoHS Status: ROHS3 Compliant

The substitute parts 180NQ045-1 and 181NQ045-1, both manufactured by SMC Diode Solutions, meet all electrical and mechanical equivalence criteria. Both parts are classified as active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	181NQ045 (Vishay)	180NQ045-1 (SMC)	181NQ045-1 (SMC)
Voltage - DC Reverse (Vr) (Max)	45 V	45 V	45 V
Current - Average Rectified (Io)	180 A	180 A	180 A
Voltage - Forward (Vf) (Max) @ If	660 mV @ 180 A	600 mV @ 180 A	660 mV @ 180 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	15 mA @ 45 V	15 mA @ 45 V	15 mA @ 45 V
Capacitance @ Vr, F	7800 pF @ 5V, 1MHz	7700 pF @ 5V, 1MHz	7800 pF @ 5V, 1MHz
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount
Package / Case	D-67 HALF-PAK	HALF-PAK (PRM1-1)	HALF-PAK (PRM1-1)
Technology	Schottky	Schottky	Schottky
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature - Junction	Not specified	-55°C ~ 150°C	-55°C ~ 175°C

Engineering Selection Recommendations

181NQ045-1 (SMC Diode Solutions) is the primary substitute for the obsolete 181NQ045. This part maintains identical electrical specifications including forward voltage (660 mV @ 180 A) and capacitance (7800 pF @ 5V, 1MHz), ensuring direct functional equivalence. The 181NQ045-1 is classified as an active product with 929 units in stock, providing reliable supply availability. Operating temperature range extends to -55°C ~ 175°C, supporting extended thermal operating conditions. ROHS3 compliance is maintained.

180NQ045-1 (SMC Diode Solutions) serves as an alternative substitute when 181NQ045-1 is unavailable. This part meets all core electrical and mechanical requirements with identical voltage and current ratings. The forward voltage specification is 600 mV @ 180 A, which is 60 mV lower than the original part, resulting in reduced power dissipation. Capacitance is marginally lower at 7700 pF @ 5V, 1MHz. Operating temperature range is -55°C ~ 150°C. This part is active with 625 units in stock and maintains ROHS3 compliance.

Both substitute parts are manufactured by SMC Diode Solutions and are classified as active products, ensuring long-term availability and manufacturing continuity compared to the obsolete Vishay original.

Frequently Asked Questions (FAQ)

Q: Can the 180NQ045-1 be used as a direct replacement for the 181NQ045?

A: The 180NQ045-1 meets all core electrical and mechanical substitution criteria: 45 V reverse voltage, 180 A average rectified current, Schottky technology, fast recovery speed, and HALF-PAK chassis mount packaging. The forward voltage is 60 mV lower (600 mV vs. 660 mV @ 180 A), and capacitance is 100 pF lower (7700 pF vs. 7800 pF @ 5V, 1MHz). These differences are within typical component tolerance ranges for Schottky diode applications.

Q: What is the difference between the 180NQ045-1 and 181NQ045-1 substitutes?

A: Both parts are electrically and mechanically equivalent to the original 181NQ045. The primary differences are: (1) Forward voltage: 180NQ045-1 is 600 mV @ 180 A; 181NQ045-1 is 660 mV @ 180 A, matching the original specification. (2) Capacitance: 180NQ045-1 is 7700 pF; 181NQ045-1 is 7800 pF, matching the original. (3) Operating temperature: 180NQ045-1 operates to 150°C; 181NQ045-1 operates to 175°C. The 181NQ045-1 provides closer electrical matching to the original part.

Q: Are the package designations D-67 HALF-PAK and PRM1-1 (Half Pak Module) compatible?

A: Both designations refer to the HALF-PAK package configuration used for chassis mount Schottky diodes. The D-67 HALF-PAK (original) and PRM1-1 (Half Pak Module) are mechanically and electrically compatible package formats for this application class.

Q: Why is the 181NQ045 classified as obsolete?

A: The 181NQ045 is listed as obsolete by Vishay General Semiconductor - Diodes Division. Active substitute parts from SMC Diode Solutions (180NQ045-1 and 181NQ045-1) are available to support continued design implementation and field service requirements.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both 180NQ045-1 and 181NQ045-1 are ROHS3 compliant, matching the compliance status of the original 181NQ045.

Q: What inventory levels are available for the substitute parts?

A: 180NQ045-1 has 625 units in stock; 181NQ045-1 has 929 units in stock. Both are classified as new original components.

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