CDH333 BK Equivalent & Substitute Parts Reference

Part Overview

The CDH333 BK is a general-purpose rectifier diode manufactured by Central Semiconductor Corp, rated for 125 V DC reverse voltage and 200 mA average rectified current in a DO-35 through-hole axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts listed below maintain electrical compatibility within the specified parameter ranges while offering active product status from current manufacturers.

Key Parameters

Parameter	CDH333 BK Value	Unit	Substitution Relevance
Voltage - DC Reverse (Vr) (Max)	125	V	Critical - must equal or exceed
Current - Average Rectified (Io)	200	mA	Critical - must equal or exceed
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 300 mA	V	Important - affects circuit performance
Reverse Recovery Time (trr)	3	µs	Important - switching characteristic
Current - Reverse Leakage @ Vr	3	nA @ 125 V	Important - leakage specification
Mounting Type	Through Hole	-	Critical - mechanical compatibility
Package / Case	DO-204AH, DO-35, Axial	-	Critical - PCB footprint compatibility
Operating Temperature - Junction	-65°C ~ 200°C	°C	Important - thermal operating range

Substitute Part Grouping Explanation

Substitution logic for the CDH333 BK is based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) must be ≥ 125 V
Current - Average Rectified (Io) must be ≥ 200 mA
Mounting Type must be Through Hole
Package must be compatible with DO-35 or Axial footprint

Secondary Compatibility Factors:

Reverse Recovery Time (trr) ≤ 3 µs preferred for signal integrity
Forward Voltage (Vf) within acceptable circuit operating margins
Reverse Leakage Current within acceptable limits for application requirements
Operating Temperature Range must support intended thermal environment

The substitute parts are grouped into two categories based on current rating alignment:

Group 1 - Full 200 mA Rating Match: 1N3595, BAX16TR, BAY135-TAP These parts maintain the 200 mA average rectified current specification.

Group 2 - Reduced 150 mA Rating: 1N3595-1, JAN1N3595A-1 These parts operate at 150 mA average rectified current, suitable for applications with lower current demands or as conservative design choices.

Parameter Comparison

Parameter	CDH333 BK	1N3595	1N3595-1	BAX16TR	BAY135-TAP	JAN1N3595A-1
Voltage - DC Reverse (Vr) (Max)	125 V	125 V	125 V	150 V	125 V	125 V
Current - Average Rectified (Io)	200 mA	200 mA	150 mA	200 mA	200 mA	150 mA
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 300 mA	1 V @ 200 mA	1 V @ 200 mA	650 mV @ 1 mA	1 V @ 30 mA	920 mV @ 100 mA
Reverse Recovery Time (trr)	3 µs	3 µs	3 µs	120 ns	Not specified	3 µs
Current - Reverse Leakage @ Vr	3 nA @ 125 V	1 nA @ 125 V	1 nA @ 125 V	100 nA @ 150 V	3 nA @ 60 V	2 nA @ 125 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	Axial	DO-35	DO-35	DO-204AH (DO-35)	DO-35
Operating Temperature - Junction	-65°C ~ 200°C	-65°C ~ 150°C	-65°C ~ 175°C	Max 175°C	Max 175°C	-65°C ~ 175°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

For Direct Replacement with Active Product Status:

1N3595 (Microchip Technology) is the primary recommended substitute. It maintains 125 V reverse voltage and 200 mA current ratings with identical 3 µs reverse recovery time. The part is active, offers superior reverse leakage performance (1 nA vs. 3 nA), and is available in Axial package. Operating temperature range extends to 150°C, which is adequate for most applications within the CDH333 BK's thermal envelope.

For DO-35 Package Requirement with Full Current Rating:

BAY135-TAP (Vishay General Semiconductor - Diodes Division) provides 125 V / 200 mA in DO-35 package with ROHS3 compliance. This part is suitable when PCB layout specifically requires DO-35 form factor. Forward voltage specification at 30 mA indicates optimized performance for low-signal applications.

For Enhanced Voltage Margin:

BAX16TR (onsemi) offers 150 V reverse voltage rating with 200 mA current in DO-35 package and ROHS3 compliance. This part provides 25 V additional voltage margin and significantly faster reverse recovery (120 ns vs. 3 µs), making it suitable for higher-frequency switching applications or designs requiring enhanced overvoltage protection.

For Reduced Current Applications:

1N3595-1 or JAN1N3595A-1 (both Microchip Technology) operate at 150 mA rating. These are appropriate when circuit analysis confirms maximum current demand does not exceed 150 mA, allowing conservative design margins. JAN1N3595A-1 includes military-grade qualification (MIL-PRF-19500/241) for applications requiring military specifications.

Compliance Considerations:

ROHS3 compliant options: 1N3595, BAX16TR, BAY135-TAP
RoHS non-compliant options: 1N3595-1, JAN1N3595A-1
All parts are REACH Unaffected and classified as EAR99

Frequently Asked Questions (FAQ)

Q: Can 1N3595-1 (150 mA) replace CDH333 BK (200 mA) in all applications?

A: No. 1N3595-1 is suitable only for applications where the maximum average rectified current does not exceed 150 mA. Circuit analysis must confirm current requirements before substitution. For applications requiring the full 200 mA capability, use 1N3595, BAX16TR, or BAY135-TAP.

Q: What is the difference between 1N3595 (Axial package) and 1N3595-1 (DO-35 package)?

A: Both are Microchip Technology products with identical electrical characteristics except for current rating (200 mA vs. 150 mA). The primary difference is mechanical packaging: 1N3595 uses Axial form factor, while 1N3595-1 uses DO-35. PCB footprint compatibility determines which is appropriate for your design.

Q: Is BAX16TR a direct replacement for CDH333 BK?

A: BAX16TR is electrically compatible with enhanced specifications: 150 V reverse voltage (vs. 125 V) and 120 ns reverse recovery time (vs. 3 µs). It is a suitable substitute for applications where faster switching performance is beneficial or where additional voltage margin is required. DO-35 package matches CDH333 BK mechanical requirements.

Q: Why does BAY135-TAP show reverse leakage at 60 V instead of 125 V?

A: The specification provided lists reverse leakage current at 60 V test voltage. This does not indicate reduced performance at 125 V operation; it reflects the manufacturer's characterization methodology. The part is rated for 125 V continuous operation.

Q: Can I use JAN1N3595A-1 in commercial applications, or is it restricted to military use?

A: JAN1N3595A-1 includes military qualification (MIL-PRF-19500/241) but is not restricted to military applications. It is available for commercial procurement and offers the same electrical performance as 1N3595-1 with additional qualification documentation. Military-grade parts are often preferred in high-reliability commercial applications.

Q: What is the significance of the 3 µs reverse recovery time specification?

A: Reverse recovery time (trr) indicates how quickly the diode transitions from conducting to blocking state when reverse bias is applied. A 3 µs specification is typical for general-purpose rectifier diodes. BAX16TR's 120 ns specification indicates faster switching, beneficial for higher-frequency applications. For standard 50/60 Hz rectification, both are acceptable.

Q: Are all substitute parts through-hole mounted?

A: Yes. All substitute parts listed (1N3595, 1N3595-1, BAX16TR, BAY135-TAP, JAN1N3595A-1) are through-hole mounted components compatible with PCB designs using through-hole technology. No surface-mount alternatives are included in this reference.

Q: What is the temperature operating range difference between CDH333 BK and its substitutes?

A: CDH333 BK operates from -65°C to 200°C. Substitute parts have reduced upper temperature limits: 1N3595 to 150°C, BAX16TR and BAY135-TAP to 175°C maximum, and 1N3595-1 and JAN1N3595A-1 to 175°C. For applications requiring operation above 175°C, CDH333 BK's extended range may be necessary; however, given its obsolete status, design modification may be required.

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