1N645 Equivalent & Substitute Parts

Part Overview

The 1N645 is a general-purpose rectifier diode manufactured by Microchip Technology, rated for 225 V DC reverse voltage and 400 mA average rectified current. The device is packaged in a DO-35 (DO-204AH) through-hole axial configuration and operates across a junction temperature range of -65°C to 175°C. This diode is classified as Active product status and utilizes standard recovery technology with recovery time exceeding 500 ns at currents greater than 200 mA.

Equivalent and substitute parts are identified based on matching electrical specifications, mechanical packaging, and operational characteristics. Substitution becomes necessary when the primary part number experiences supply constraints, inventory limitations, or when alternative sourcing from qualified manufacturers is required for procurement flexibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	225	V
Current - Average Rectified (Io)	400	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 400 mA	V
Speed - Recovery Time	>500	ns @ >200mA (Io)
Current - Reverse Leakage @ Vr	200	nA @ 225 V
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Operating Temperature - Junction	-65 to 175	°C
Technology	Standard	-

Substitute Part Grouping Explanation

Substitute parts for the 1N645 are identified through parametric equivalence matching. The substitution logic is based on the following critical parameters that must align between the primary part and substitute candidates:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 225 V
Current - Average Rectified (Io): 400 mA
Voltage - Forward (Vf) (Max) @ If: 1 V @ 400 mA
Speed - Recovery Time: Standard Recovery >500 ns, >200 mA (Io)

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: DO-204AH, DO-35, Axial

Operational Parameters (Must Match):

Operating Temperature - Junction: -65°C to 175°C
Technology: Standard

The 1N645-1 manufactured by Solid State Inc. meets all parametric equivalence criteria and qualifies as a direct substitute for the 1N645.

Parameter Comparison

Parameter	1N645 (Microchip Technology)	1N645-1 (Solid State Inc.)	Match Status
Voltage - DC Reverse (Vr) (Max)	225 V	225 V	Match
Current - Average Rectified (Io)	400 mA	400 mA	Match
Voltage - Forward (Vf) (Max) @ If	1 V @ 400 mA	1 V @ 400 mA	Match
Speed - Recovery Time	>500 ns @ >200 mA (Io)	>500 ns @ >200 mA (Io)	Match
Current - Reverse Leakage @ Vr	200 nA @ 225 V	50 nA @ 225 V	Compatible
Mounting Type	Through Hole	Through Hole	Match
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	Match
Operating Temperature - Junction	-65°C to 175°C	-65°C to 175°C	Match
Technology	Standard	Standard	Match
Product Status	Active	Active	Match

Engineering Selection Recommendations

1N645-1 (Solid State Inc.) is a qualified parametric equivalent substitute for the 1N645 (Microchip Technology). Both devices maintain Active product status and are manufactured using standard rectifier diode technology.

The 1N645-1 demonstrates superior reverse leakage characteristics at 50 nA compared to the 1N645 at 200 nA, both measured at 225 V. This represents an improvement in leakage performance while maintaining all other electrical and mechanical specifications.

The 1N645-1 carries RoHS3 compliance certification and Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating unrestricted moisture exposure tolerance. The primary part 1N645 does not specify these compliance attributes in the provided data.

Both parts are classified under ECCN EAR99 and share compatible HTSUS commodity codes (8541.10.0070 for 1N645 and 8541.10.0080 for 1N645-1), confirming regulatory alignment for international trade purposes.

Frequently Asked Questions (FAQ)

Q: What electrical parameters must match for the 1N645-1 to substitute the 1N645?

A: The reverse voltage rating (225 V), average rectified current (400 mA), forward voltage drop (1 V @ 400 mA), and recovery time specification (>500 ns @ >200 mA) must be identical. All these parameters match between the 1N645 and 1N645-1.

Q: Are the packages physically identical?

A: Yes. Both the 1N645 and 1N645-1 use the DO-35 (DO-204AH) axial through-hole package configuration. They are mechanically interchangeable in PCB layouts and breadboard applications.

Q: What is the difference in reverse leakage current between these parts?

A: The 1N645 specifies 200 nA reverse leakage at 225 V, while the 1N645-1 specifies 50 nA at the same voltage. The 1N645-1 exhibits lower leakage, which is beneficial for applications requiring minimal standby current.

Q: Does the 1N645-1 have compliance certifications that the 1N645 does not?

A: The 1N645-1 is certified RoHS3 compliant and carries an MSL rating of 1 (Unlimited). The 1N645 data does not specify these certifications. Both parts are REACH Unaffected or Vendor Undefined, respectively.

Q: Can the 1N645-1 operate across the same temperature range as the 1N645?

A: Yes. Both devices operate across the identical junction temperature range of -65°C to 175°C, ensuring thermal compatibility in all operating environments.

Q: Are there any differences in recovery time performance?

A: No. Both the 1N645 and 1N645-1 specify standard recovery time exceeding 500 ns at currents greater than 200 mA. Recovery time performance is equivalent.

Q: What inventory availability exists for each part?

A: The 1N645 has 965 pieces in stock. The 1N645-1 has 68,600 pieces in stock, providing significantly greater availability for procurement.

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