CMR1-01M BK Equivalent & Substitute Parts

Part Overview

The CMR1-01M BK is a general-purpose rectifier diode manufactured by Central Semiconductor Corp, rated for 100 V DC reverse voltage and 1 A average rectified current in a surface mount SMA package (DO-214AC). This component is classified as Active product status and utilizes standard recovery technology with a maximum forward voltage of 1.1 V at 1 A.

Equivalent and substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required, or when design optimization calls for enhanced electrical characteristics such as faster recovery times or improved forward voltage performance.

Key Parameters

Parameter	CMR1-01M BK	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 @ 1 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Capacitance @ Vr, F	8	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	-
Operating Temperature - Junction	-65°C ~ 150°C	-
Technology	Standard	-

Substitute Part Grouping Explanation

Substitution of the CMR1-01M BK is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 100 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA (surface mount)
Mounting Type: Surface Mount

Compatible Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 900 mV to 1.3 V @ 1 A
Speed: Both Standard Recovery (>500ns) and Fast Recovery (≤500ns) are acceptable
Current - Reverse Leakage @ Vr: Acceptable range 1 µA to 10 µA @ 100 V
Operating Temperature - Junction: Acceptable range -65°C to 175°C
Capacitance @ Vr, F: Acceptable range 8 pF to 20 pF @ 4V, 1MHz

All substitute parts listed meet the mandatory matching parameters and fall within the compatible variation ranges. Substitute parts are grouped by manufacturer and product status to facilitate selection based on availability and design requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (V)	Speed	Reverse Leakage @ Vr (µA)	Capacitance @ 4V, 1MHz (pF)	Tj Range (°C)	Product Status	Packaging
CMR1-01M BK	Central Semiconductor Corp	100	1	1.1	Standard Recovery >500ns	5	8	-65 ~ 150	Active	SMA
US1B-13-F	Diodes Incorporated	100	1	1.0	Fast Recovery ≤500ns	5	20	-65 ~ 150	Active	Tape & Reel (TR)
ES1B-13-F	Diodes Incorporated	100	1	0.92	Fast Recovery ≤500ns	5	10	-55 ~ 150	Active	Tape & Reel (TR)
ES1B-E3/5AT	Vishay General Semiconductor - Diodes Division	100	1	0.92	Fast Recovery ≤500ns	5	10	-55 ~ 150	Active	Cut Tape (CT) & Digi-Reel®
ES1B-E3/61T	Vishay General Semiconductor - Diodes Division	100	1	0.92	Fast Recovery ≤500ns	5	10	-55 ~ 150	Active	Cut Tape (CT) & Digi-Reel®
ES1B-LTP	Micro Commercial Co	100	1	0.95	Fast Recovery ≤500ns	5	15	-65 ~ 175	Not For New Designs	Tape & Reel (TR)
ES1BHE3_A/H	Vishay General Semiconductor - Diodes Division	100	1	0.92	Fast Recovery ≤500ns	5	10	-55 ~ 150	Active	Tape & Reel (TR)
ES1BHE3_A/I	Vishay General Semiconductor - Diodes Division	100	1	0.92	Fast Recovery ≤500ns	5	10	-55 ~ 150	Active	Tape & Reel (TR)
ESH1B-E3/61T	Vishay General Semiconductor - Diodes Division	100	1	0.90	Fast Recovery ≤500ns	1	-	-55 ~ 175	Active	Tape & Reel (TR)
GS1B-LTP	Micro Commercial Co	100	1	1.0	Standard Recovery >500ns	10	15	-55 ~ 150	Not For New Designs	Tape & Reel (TR)
RS1B-13-F	Diodes Incorporated	100	1	1.3	Fast Recovery ≤500ns	5	15	-65 ~ 150	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Selection (Active Product Status):

For new designs and applications requiring long-term availability, select from the following Active status parts:

US1B-13-F (Diodes Incorporated): Direct electrical equivalent with improved forward voltage (1.0 V) and fast recovery characteristics. Suitable for general-purpose rectification with enhanced switching performance.
ES1B-13-F (Diodes Incorporated): Fast recovery diode with lowest forward voltage (0.92 V) among standard offerings. Recommended for applications sensitive to power dissipation.
ES1B-E3/5AT and ES1B-E3/61T (Vishay General Semiconductor - Diodes Division): Functionally identical fast recovery diodes with ROHS3 compliance. Available in Cut Tape and Digi-Reel packaging formats.
ES1BHE3_A/H and ES1BHE3_A/I (Vishay General Semiconductor - Diodes Division): Automotive-grade variants with AEC-Q101 qualification. Suitable for automotive and high-reliability applications.
ESH1B-E3/61T (Vishay General Semiconductor - Diodes Division): Superior reverse leakage performance (1 µA) with extended operating temperature range (-55°C to 175°C). Recommended for precision applications requiring minimal leakage current.

Secondary Selection (Not For New Designs):

ES1B-LTP and GS1B-LTP (Micro Commercial Co): Available for legacy system support and maintenance applications only. Not recommended for new product development.

Compliance Considerations:

All listed substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the CMR1-01M BK. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all substitutes, indicating no special moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the CMR1-01M BK with any of the listed parts without circuit modification?

A: Yes. All listed substitute parts meet the mandatory electrical parameters (100 V reverse voltage, 1 A average rectified current) and use identical DO-214AC SMA surface mount packaging. Direct substitution is electrically and mechanically compatible. However, verify that your circuit design can accommodate the forward voltage variations (0.90 V to 1.3 V range) and recovery speed differences (Standard vs. Fast Recovery).

Q: What is the difference between Standard Recovery and Fast Recovery diodes?

A: Standard Recovery diodes exhibit reverse recovery times greater than 500 ns, while Fast Recovery diodes have reverse recovery times of 500 ns or less. Fast Recovery diodes reduce switching losses and are preferred in high-frequency switching applications. The CMR1-01M BK uses Standard Recovery technology; substitution with Fast Recovery parts (US1B-13-F, ES1B-13-F, etc.) improves performance in switching circuits.

Q: Why do some substitute parts have lower forward voltage specifications?

A: Forward voltage variation (0.90 V to 1.3 V @ 1 A) reflects differences in semiconductor material quality, doping profiles, and manufacturing processes between manufacturers. Lower forward voltage reduces power dissipation and heat generation. Parts such as ESH1B-E3/61T (0.90 V) and ES1B-13-F (0.92 V) offer superior efficiency compared to the original CMR1-01M BK (1.1 V).

Q: Are the automotive-qualified parts (ES1BHE3_A/H and ES1BHE3_A/I) suitable for non-automotive applications?

A: Yes. Automotive-qualified parts with AEC-Q101 certification exceed standard reliability requirements and are fully compatible with general-purpose applications. These parts are appropriate for any application requiring enhanced reliability and traceability.

Q: What packaging formats are available for substitutes?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and individual SMA packages. The original CMR1-01M BK does not specify packaging format. Select packaging based on your procurement and assembly requirements.

Q: Should I use parts marked "Not For New Designs"?

A: Parts designated "Not For New Designs" (ES1B-LTP and GS1B-LTP) are suitable only for maintenance, repair, and legacy system support. For new product development, select from Active status parts to ensure long-term availability and manufacturer support.

Q: How do I verify reverse leakage current specifications?

A: Reverse leakage current is measured at maximum reverse voltage (100 V in this case). The CMR1-01M BK specifies 5 µA @ 100 V. Substitute parts range from 1 µA to 10 µA @ 100 V. Lower leakage current (ESH1B-E3/61T at 1 µA) is beneficial in precision analog circuits and high-impedance applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and REACH Unaffected status, matching the regulatory compliance of the CMR1-01M BK.

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