Equivalent & Substitute Parts for 160CMQ040

Part Overview

The 160CMQ040 is a Schottky diode rated for 40 V DC reverse voltage and 160 A average rectified current, housed in a TO-249AA chassis mount package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement continuity. The fast recovery characteristic (≤500 ns) and low forward voltage drop make this diode suitable for high-current rectification applications requiring minimal thermal dissipation.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	160	A
Voltage - Forward (Vf) (Max) @ If	860	mV @ 160 A
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	—
Current - Reverse Leakage @ Vr	5	mA @ 40 V
Capacitance @ Vr, F	2600	pF @ 5 V, 1 MHz
Mounting Type	Chassis Mount	—
Package / Case	TO-249AA	—
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 160CMQ040 is determined by strict equivalence across the following critical parameters:

Voltage Rating: DC reverse voltage must equal 40 V
Current Rating: Average rectified current must equal 160 A per diode
Technology: Schottky diode technology
Package: TO-249AA chassis mount configuration
Forward Voltage: Maximum forward voltage drop at rated current
Reverse Leakage: Maximum reverse leakage current at rated voltage
Recovery Speed: Fast recovery characteristic ≤500 ns
Compliance: ROHS3 compliance and MSL rating

The 161CMQ040 qualifies as a substitute based on matching all critical electrical parameters and package specifications. The 161CMQ040 is configured as a 1 Pair Common Cathode diode array, maintaining the same voltage, current, and thermal characteristics while offering an alternative internal architecture within the identical TO-249AA package footprint.

Parameter Comparison

Parameter	160CMQ040	161CMQ040	Match Status
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	Equivalent
Current - Average Rectified (Io)	160 A	160 A (per Diode)	Equivalent
Voltage - Forward (Vf) (Max) @ If	860 mV @ 160 A	880 mV @ 160 A	Compatible
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	Fast Recovery ≤500 ns, >200 mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	5 mA @ 40 V	5 mA @ 40 V	Equivalent
Capacitance @ Vr, F	2600 pF @ 5 V, 1 MHz	Not Specified	—
Mounting Type	Chassis Mount	Chassis Mount	Equivalent
Package / Case	TO-249AA	TO-249AA	Equivalent
Technology	Schottky	Schottky	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both the 160CMQ040 and 161CMQ040 are classified as obsolete products. Selection between these parts should be based on circuit architecture requirements and internal diode configuration compatibility.

The 160CMQ040 is a single diode configuration suitable for applications requiring a standalone rectification element. The 161CMQ040 is a 1 Pair Common Cathode diode array, appropriate for applications utilizing dual-diode topologies with a shared cathode node.

Both parts maintain identical electrical performance specifications across voltage, current, and thermal parameters. The forward voltage differential of 20 mV (860 mV versus 880 mV at 160 A) falls within normal manufacturing tolerance ranges for Schottky diodes and does not constitute a functional limitation.

Both parts satisfy ROHS3 compliance and MSL Level 1 requirements, ensuring compatibility with standard manufacturing and storage protocols. Procurement should prioritize availability, as both parts are obsolete and inventory levels may vary.

Frequently Asked Questions (FAQ)

Q: Can the 161CMQ040 directly replace the 160CMQ040 in all applications?

A: Direct replacement depends on circuit topology. The 160CMQ040 is a single diode; the 161CMQ040 is a dual-diode common cathode configuration. Replacement is valid only if the circuit design accommodates the dual-diode architecture and common cathode connection. Verify PCB layout and schematic compatibility before substitution.

Q: What is the significance of the 20 mV forward voltage difference between these parts?

A: The 160CMQ040 exhibits 860 mV forward voltage drop at 160 A, while the 161CMQ040 exhibits 880 mV at the same current. This 20 mV difference is within normal manufacturing tolerance for Schottky diodes and does not affect circuit functionality in standard rectification applications. Thermal dissipation calculations should account for this variance in high-power designs.

Q: Are both parts suitable for new designs?

A: Both parts are classified as obsolete. New designs should not incorporate these components. Existing designs requiring component replacement or procurement should evaluate these parts only for legacy system support and maintenance.

Q: Do the TO-249AA packages have identical mechanical footprints?

A: Both parts use the TO-249AA chassis mount package, ensuring mechanical compatibility. PCB mounting holes, lead spacing, and thermal interface requirements are identical between the two parts.

Q: What compliance certifications apply to both parts?

A: Both the 160CMQ040 and 161CMQ040 are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings. Both parts are REACH unaffected and classified under ECCN EAR99 for export control purposes.

Q: How do the reverse leakage characteristics compare?

A: Both parts specify identical reverse leakage of 5 mA at 40 V DC reverse voltage. This parameter is critical for applications requiring minimal standby current and is equivalent between the two parts.

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