CMSH1-40M BK PBFREE Equivalent & Substitute Parts

Part Overview

The CMSH1-40M BK PBFREE is a Schottky diode manufactured by Central Semiconductor Corp, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount SMA package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when designs require higher current ratings, alternative packaging configurations, or sourcing flexibility while maintaining electrical compatibility within the 40 V reverse voltage class and SMA form factor.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 1 A	mV
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Capacitance @ Vr, F	55	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CMSH1-40M BK PBFREE are selected based on the following substitution criteria:

Primary Compatibility Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V or higher
Package / Case: DO-214AC (SMA) or DO-221AC (SMA Flat Leads)
Mounting Type: Surface Mount
Operating Temperature Range: -65°C to 150°C minimum
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitution Logic: Substitute parts maintain the 40 V reverse voltage rating and SMA package family. Current ratings may exceed the 1 A specification of the main part, as higher-rated devices are electrically compatible in applications requiring equal or lower current. Forward voltage characteristics and recovery speed may vary within the Schottky and Super Barrier technology classes. All substitutes are Active status products with identical compliance certifications.

Parameter Comparison

Parameter	CMSH1-40M BK PBFREE	SBR2A40SA-13	SBR2U30SA-13	SBR3A40SA-13	SBR3A40SAF-13	SBR3A40SAQ-13
Manufacturer	Central Semiconductor Corp	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Technology	Schottky	Super Barrier	Super Barrier	Super Barrier	Super Barrier	Super Barrier
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	30 V	40 V	40 V	40 V
Current - Average Rectified (Io)	1 A	2 A	2 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 1 A	550 mV @ 2 A	400 mV @ 2 A	500 mV @ 3 A	530 mV @ 3 A	480 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V	500 µA @ 40 V	500 µA @ 30 V	400 µA @ 40 V	400 µA @ 40 V	400 µA @ 40 V
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-221AC, SMA Flat Leads	DO-214AC, SMA
Supplier Device Package	SMA	SMA	SMA	SMA	SMAF	SMA
Operating Temperature - Junction	-65 to 150 °C	-65 to 150 °C	-65 to 150 °C	-65 to 150 °C	-65 to 150 °C	-65 to 150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

SBR2A40SA-13 (Diodes Incorporated): This part maintains 40 V reverse voltage rating and SMA package compatibility. Current rating of 2 A exceeds the 1 A specification of CMSH1-40M BK PBFREE. Forward voltage is 550 mV at 2 A. Recovery speed is Standard (>500ns). All compliance certifications match: ROHS3 Compliant, REACH Unaffected, MSL 1. Suitable for applications where 2 A current capacity is acceptable and standard recovery speed meets circuit requirements.

SBR2U30SA-13 (Diodes Incorporated): This part operates at 30 V reverse voltage, which is lower than the 40 V rating of CMSH1-40M BK PBFREE. Current rating is 2 A. Forward voltage is 400 mV at 2 A. Recovery speed is Fast (≤500ns). All compliance certifications match. This substitute is applicable only in circuits where maximum reverse voltage requirement is 30 V or lower.

SBR3A40SA-13 (Diodes Incorporated): This part maintains 40 V reverse voltage and SMA package. Current rating of 3 A exceeds the 1 A specification. Forward voltage is 500 mV at 3 A. Recovery speed is Fast (≤500ns). Reverse leakage is 400 µA at 40 V. All compliance certifications match. Suitable for applications requiring higher current capacity with fast recovery characteristics.

SBR3A40SAF-13 (Diodes Incorporated): This part maintains 40 V reverse voltage but uses DO-221AC package with SMA Flat Leads (SMAF) instead of standard SMA. Current rating is 3 A. Forward voltage is 530 mV at 3 A. Recovery speed is Fast (≤500ns). All compliance certifications match. Package change requires PCB layout modification; use only when flat lead configuration is required.

SBR3A40SAQ-13 (Diodes Incorporated): This part maintains 40 V reverse voltage and SMA package. Current rating is 3 A. Forward voltage is 480 mV at 3 A. Recovery speed is Standard (>500ns). Reverse leakage is 400 µA at 40 V. Includes AEC-Q101 automotive qualification. All compliance certifications match. Suitable for automotive-grade applications requiring 3 A current capacity.

Frequently Asked Questions (FAQ)

Q: Can SBR2U30SA-13 be used as a direct substitute for CMSH1-40M BK PBFREE?

A: SBR2U30SA-13 is not a direct substitute. While it maintains SMA package compatibility and identical operating temperature range, its maximum reverse voltage rating is 30 V, which is lower than the 40 V rating of CMSH1-40M BK PBFREE. Use SBR2U30SA-13 only in applications where the circuit design specifies a maximum reverse voltage of 30 V or lower.

Q: What is the difference between SBR3A40SA-13 and SBR3A40SAQ-13?

A: Both parts maintain 40 V reverse voltage, 3 A current rating, and SMA package. The primary differences are: SBR3A40SAQ-13 includes AEC-Q101 automotive qualification and has a forward voltage of 480 mV at 3 A with Standard recovery speed, while SBR3A40SA-13 has a forward voltage of 500 mV at 3 A with Fast recovery speed. Select SBR3A40SAQ-13 for automotive applications; select SBR3A40SA-13 for general industrial applications requiring fast recovery.

Q: Why does SBR3A40SAF-13 have a different package designation (SMAF)?

A: SBR3A40SAF-13 uses DO-221AC package with flat leads (SMAF) instead of the standard DO-214AC SMA package. This package variant requires different PCB footprint and soldering approach. Use SBR3A40SAF-13 only when the circuit board design specifically accommodates flat lead geometry.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—SBR2A40SA-13, SBR2U30SA-13, SBR3A40SA-13, SBR3A40SAF-13, and SBR3A40SAQ-13—are ROHS3 Compliant with MSL 1 (Unlimited) and REACH Unaffected status, matching the compliance profile of CMSH1-40M BK PBFREE.

Q: Can I use a higher current-rated diode (2 A or 3 A) in place of the 1 A CMSH1-40M BK PBFREE?

A: Yes. Higher current-rated diodes are electrically compatible in applications requiring equal or lower current. SBR2A40SA-13 (2 A) and SBR3A40SA-13 or SBR3A40SAQ-13 (3 A) can replace CMSH1-40M BK PBFREE in 1 A circuits. Verify that forward voltage characteristics and recovery speed meet circuit performance requirements.

Q: What is the significance of recovery speed differences between Fast (≤500ns) and Standard (>500ns)?

A: Recovery speed affects switching transient behavior. Fast recovery (≤500ns) reduces reverse recovery time, minimizing switching losses and noise in high-frequency applications. Standard recovery (>500ns) is suitable for lower-frequency circuits. Select based on circuit operating frequency and switching performance requirements.

Q: Are SBR parts interchangeable with CMSH1 in all applications?

A: SBR parts use Super Barrier technology while CMSH1 uses Schottky technology. Both are compatible within the 40 V reverse voltage and SMA package class. Verify forward voltage and recovery speed specifications match circuit design requirements before substitution.

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