CMSH2-40M BK PBFREE Equivalent & Substitute Parts

Part Overview

The CMSH2-40M BK PBFREE is a Schottky rectifier diode manufactured by Central Semiconductor Corp, rated for 40 V DC reverse voltage and 2 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 based on matching electrical ratings, package compatibility, and thermal operating ranges to support design flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 40 V
Package / Case	DO-214AC, SMA
Operating Temperature - Junction	-65°C ~ 150°C
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CMSH2-40M BK PBFREE is determined by the following criteria:

Primary Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 2 A
Package / Case: DO-214AC, SMA
Operating Temperature - Junction: -65°C ~ 150°C
RoHS3 Compliance

Substitution Categories:

Category 1: Direct Electrical Equivalents (40 V, 2 A) Parts meeting all primary parameters with identical voltage and current ratings. These provide pin-for-pin and functional compatibility.

Category 2: Voltage-Reduced Alternatives (30 V, 2 A) Parts with lower reverse voltage rating (30 V) but matching 2 A current rating. These are suitable for applications where the circuit operates below 30 V and cost or performance optimization is required.

Category 3: Current-Enhanced Alternatives (40 V, 3 A) Parts with higher current rating (3 A) at the same 40 V reverse voltage. These provide design margin for higher current applications and are backward compatible in lower-current circuits.

Category 4: Package Variants Parts with alternative surface mount packages (SMAF vs. SMA) but matching electrical specifications. Package selection depends on PCB layout and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Technology	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Package	Product Status
CMSH2-40M BK PBFREE	Central Semiconductor Corp	Schottky	40 V	2 A	550 mV @ 2 A	Fast Recovery ≤ 500ns	500 µA @ 40 V	DO-214AC, SMA	Active
SBR2A40SA-13	Diodes Incorporated	Super Barrier	40 V	2 A	550 mV @ 2 A	Standard Recovery >500ns	500 µA @ 40 V	DO-214AC, SMA	Active
B240A-E3/61T	Vishay General Semiconductor - Diodes Division	Schottky	40 V	2 A	550 mV @ 2 A	Fast Recovery ≤ 500ns	500 µA @ 40 V	DO-214AC, SMA	Active
SBR2U30SA-13	Diodes Incorporated	Super Barrier	30 V	2 A	400 mV @ 2 A	Fast Recovery ≤ 500ns	500 µA @ 30 V	DO-214AC, SMA	Active
SBR3A40SA-13	Diodes Incorporated	Super Barrier	40 V	3 A	500 mV @ 3 A	Fast Recovery ≤ 500ns	400 µA @ 40 V	DO-214AC, SMA	Active
SBR3A40SAF-13	Diodes Incorporated	Super Barrier	40 V	3 A	530 mV @ 3 A	Fast Recovery ≤ 500ns	400 µA @ 40 V	DO-221AC, SMA Flat Leads	Active
SBR3A40SAQ-13	Diodes Incorporated	Super Barrier	40 V	3 A	480 mV @ 3 A	Standard Recovery >500ns	400 µA @ 40 V	DO-214AC, SMA	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for 1:1 Replacement)

SBR2A40SA-13 and B240A-E3/61T are direct electrical equivalents to CMSH2-40M BK PBFREE, matching 40 V reverse voltage and 2 A current ratings. Both are Active status products with RoHS3 compliance and MSL 1 rating. SBR2A40SA-13 uses Super Barrier technology with standard recovery speed, while B240A-E3/61T employs Schottky technology with fast recovery characteristics matching the original part. Selection between these depends on technology preference and supply availability.

Voltage-Reduced Alternative

SBR2U30SA-13 operates at 30 V maximum reverse voltage with 2 A current rating. This part is suitable for circuits designed to operate below 30 V and offers improved forward voltage characteristics (400 mV @ 2 A versus 550 mV @ 2 A). Use this substitute only when circuit voltage specifications confirm operation within 30 V limits.

Current-Enhanced Alternatives

SBR3A40SA-13, SBR3A40SAF-13, and SBR3A40SAQ-13 provide 3 A current rating at 40 V reverse voltage. These parts are backward compatible in 2 A applications and offer design margin for higher current requirements. SBR3A40SAQ-13 includes AEC-Q101 automotive qualification. Package selection between SMA (SBR3A40SA-13, SBR3A40SAQ-13) and SMAF (SBR3A40SAF-13) depends on PCB layout constraints.

Compliance and Certification

All substitute parts maintain RoHS3 compliance, MSL 1 rating, and -65°C to 150°C operating temperature range. All parts are Active status products with unrestricted moisture sensitivity levels.

Frequently Asked Questions (FAQ)

Q: Can SBR2A40SA-13 replace CMSH2-40M BK PBFREE in all applications?

A: SBR2A40SA-13 matches the electrical specifications (40 V, 2 A) and package (DO-214AC, SMA). The primary difference is recovery speed: SBR2A40SA-13 has standard recovery (>500ns) while CMSH2-40M has fast recovery (≤500ns). Substitution is valid for applications where recovery speed is not a critical parameter. Verify circuit timing requirements before substitution.

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

A: Both parts are rated 40 V, 3 A in DO-214AC SMA package. SBR3A40SAQ-13 includes AEC-Q101 automotive qualification and has standard recovery speed (>500ns), while SBR3A40SA-13 has fast recovery speed (≤500ns). Forward voltage differs slightly: 480 mV @ 3 A (SAQ-13) versus 500 mV @ 3 A (SA-13). Select SBR3A40SAQ-13 for automotive applications requiring AEC-Q101 compliance.

Q: Can I use SBR2U30SA-13 as a substitute for CMSH2-40M BK PBFREE?

A: SBR2U30SA-13 is suitable only if your circuit operates at 30 V or below. The 30 V reverse voltage rating is lower than the original 40 V specification. This part offers improved forward voltage (400 mV @ 2 A versus 550 mV @ 2 A), reducing power dissipation. Confirm circuit voltage specifications before using this substitute.

Q: What is the difference between SMA and SMAF packages?

A: SMA (DO-214AC) and SMAF (DO-221AC, SMA Flat Leads) are both surface mount packages with different lead geometries. SMAF has flat leads while SMA has standard leads. Package selection depends on PCB pad design and assembly equipment. Electrical performance is identical; substitution is based on mechanical compatibility only.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (SBR2A40SA-13, B240A-E3/61T, SBR2U30SA-13, SBR3A40SA-13, SBR3A40SAF-13, SBR3A40SAQ-13) are RoHS3 compliant with MSL 1 rating, matching the original CMSH2-40M BK PBFREE specifications.

Q: What does "Fast Recovery ≤500ns" versus "Standard Recovery >500ns" mean?

A: Recovery speed refers to the time required for the diode to switch from conducting to blocking state. Fast recovery (≤500ns) is suitable for high-frequency switching applications. Standard recovery (>500ns) is acceptable for lower-frequency circuits. Verify your circuit's switching frequency requirements before selecting between fast and standard recovery parts.

Q: Can I use a 3 A rated diode in a 2 A application?

A: Yes. SBR3A40SA-13, SBR3A40SAF-13, and SBR3A40SAQ-13 are rated for 3 A and are backward compatible in 2 A applications. The higher current rating provides design margin and typically results in lower junction temperature and improved reliability. No circuit modification is required.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message