CMSH2-40L TR13 Equivalent & Substitute Parts

Part Overview

The CMSH2-40L TR13 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 2 A average rectified current in a surface mount SMB (DO-214AA) package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The CMSH2-40L TR13 serves in fast recovery rectification applications requiring low forward voltage drop and rapid switching characteristics typical of Schottky technology.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	400 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 40 V	µA
Capacitance @ Vr, F	150pF @ 4V, 1MHz	pF
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution for the CMSH2-40L TR13 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Technology: Schottky rectifier diode
Package / Case: Surface mount DO-214AA (SMB) or compatible package
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature Range: Must support -65°C to 150°C junction temperature or equivalent

Acceptable Variations:

Forward voltage (Vf) may vary within typical Schottky diode ranges (400–500 mV @ rated current)
Reverse leakage current may vary (400–500 µA @ 40 V)
Capacitance values may differ due to manufacturing process variations
Higher current ratings (3 A) are acceptable as they provide design margin
Active product status is preferred over obsolete status for long-term availability

Non-Substitutable Parameters:

Voltage rating below 40 V
Current rating below 2 A
Non-Schottky technology
Non-surface-mount packages
Operating temperature range below -65°C or above 150°C

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Product Status	RoHS Status
CMSH2-40L TR13	Central Semiconductor Corp	40	2	400 @ 2A	DO-214AA, SMB	Obsolete	REACH Unaffected
CMSH2-20L TR13 PBFREE	Central Semiconductor Corp	20	2	400 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant
SSL24	Taiwan Semiconductor Corporation	40	2	410 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant
B140BQ-13-F	Diodes Incorporated	40	1	500 @ 1A	DO-214AA, SMB	Active	ROHS3 Compliant
B240-13-F	Diodes Incorporated	40	2	500 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant
B240A-13-F	Diodes Incorporated	40	2	500 @ 2A	DO-214AC, SMA	Active	ROHS3 Compliant
B240Q-13-F	Diodes Incorporated	40	2	500 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant
B340BQ-13-F	Diodes Incorporated	40	3	500 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant
B340LB-E3/52T	Vishay General Semiconductor - Diodes Division	40	3	450 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant
B340LB-E3/5BT	Vishay General Semiconductor - Diodes Division	40	3	450 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant
B340LB-M3/52T	Vishay General Semiconductor - Diodes Division	40	3	450 @ 3A	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The SSL24 from Taiwan Semiconductor Corporation is the closest direct equivalent. It matches the CMSH2-40L TR13 in voltage rating (40 V), current rating (2 A), package type (DO-214AA, SMB), and operating temperature range (-55°C to 125°C). The SSL24 is in active product status with ROHS3 compliance, ensuring long-term availability and regulatory compliance.

The B240-13-F and B240Q-13-F from Diodes Incorporated are functionally equivalent alternatives. Both provide 40 V, 2 A ratings in DO-214AA SMB packages with active product status and ROHS3 compliance. The B240Q-13-F includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. Forward voltage is specified at 500 mV @ 2 A, which is within acceptable Schottky diode performance margins.

Higher Current Alternatives (Design Margin):

The B340BQ-13-F, B340LB-E3/52T, B340LB-E3/5BT, and B340LB-M3/52T provide 40 V, 3 A ratings in DO-214AA SMB packages. These parts offer increased current capacity beyond the 2 A requirement, providing design margin for thermal and electrical stress. All are in active product status with ROHS3 compliance. The Vishay B340LB series specifies forward voltage at 450 mV @ 3 A, indicating superior low-voltage performance.

Package Variant:

The B240A-13-F is electrically equivalent to B240-13-F but uses a DO-214AC SMA package instead of DO-214AA SMB. This part is suitable only if the PCB layout and assembly process accommodate the SMA package footprint.

Not Recommended:

The CMSH2-20L TR13 PBFREE has a reduced voltage rating of 20 V, which does not meet the 40 V requirement of the original part. This part is not a suitable substitute.

Frequently Asked Questions (FAQ)

Q: Can the CMSH2-20L TR13 PBFREE substitute for the CMSH2-40L TR13?

A: No. The CMSH2-20L TR13 PBFREE has a maximum reverse voltage rating of 20 V, which is insufficient for applications requiring 40 V operation. Using this part would result in diode failure under rated voltage conditions.

Q: What is the difference between B240-13-F and B240Q-13-F?

A: Both parts are electrically identical 40 V, 2 A Schottky diodes in DO-214AA SMB packages. The primary difference is packaging: B240-13-F is supplied in Cut Tape (CT) & Digi-Reel format, while B240Q-13-F is supplied in Tape & Reel (TR) format. The B240Q-13-F also includes AEC-Q101 automotive qualification. Selection depends on assembly process requirements and application grade.

Q: Can I use B340BQ-13-F (3 A) instead of a 2 A part?

A: Yes. The B340BQ-13-F provides 40 V, 3 A ratings, which exceeds the 2 A requirement of the CMSH2-40L TR13. Higher current capacity provides design margin and does not compromise circuit function. The part is pin-compatible in the DO-214AA SMB package.

Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages?

A: DO-214AA and DO-214AC are different surface mount package outlines. DO-214AA (SMB) and DO-214AC (SMA) have different footprints and land patterns on the PCB. The B240A-13-F uses DO-214AC (SMA), while most other substitutes use DO-214AA (SMB). Verify PCB layout compatibility before selecting a package variant.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original CMSH2-40L TR13 is marked as REACH Unaffected. All substitute parts maintain REACH Unaffected status and ROHS3 compliance, ensuring regulatory compatibility for new designs.

Q: What is the operating temperature range difference between parts?

A: The CMSH2-40L TR13 specifies -65°C to 150°C junction temperature. The SSL24 specifies -55°C to 125°C. Most Diodes Incorporated and Vishay parts specify -65°C to 150°C. Verify application temperature requirements before selection. Parts with -65°C to 150°C ratings provide full compatibility with the original part's thermal envelope.

Q: Why do forward voltage specifications vary between parts?

A: Forward voltage (Vf) variation is normal across Schottky diode manufacturers and process nodes. The CMSH2-40L TR13 specifies 400 mV @ 2 A, while substitutes range from 400–500 mV @ rated current. These variations fall within typical Schottky diode performance and do not affect circuit function in standard rectification applications. Verify forward voltage impact in high-precision analog circuits.

Q: Is the SSL24 from Taiwan Semiconductor Corporation a direct replacement?

A: Yes. The SSL24 matches the CMSH2-40L TR13 in voltage (40 V), current (2 A), package (DO-214AA, SMB), and technology (Schottky). It is in active product status with ROHS3 compliance. The SSL24 is a direct functional equivalent suitable for immediate substitution.

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