CDBM240-G Schottky Diode 40V 2A Equivalent & Substitute Parts

Part Overview

The CDBM240-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V reverse voltage and 2A average rectified current in a surface mount Mini SMA/SOD-123 package. This component is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified based on matching electrical specifications and compatible package configurations to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	500	mV @ 2A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 40V
Capacitance @ Vr, F	160	pF @ 4V, 1MHz
Package / Case	SOD-123T	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CDBM240-G are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40V
Current - Average Rectified (Io): 2A
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount
RoHS3 Compliance and MSL Level 1

Package Compatibility Groups:

Group 1 - Parametric Equivalent (Same Package): CDBM240-HF maintains identical electrical specifications and SOD-123T package configuration as the main part, differing only in manufacturer suffix designation and inventory availability.

Group 2 - Functional Equivalent (DO-214AC/SMA Package): B240A-E3/5AT, B240A-E3/61T, B240A-M3/61T, SS24S-E3/61T, SSA24-E3/5AT, and SSA24-E3/61T meet all core electrical requirements (40V, 2A, Schottky, fast recovery) but utilize the larger DO-214AC (SMA) surface mount package. These parts are functionally interchangeable in applications where PCB layout accommodates the different footprint dimensions.

Electrical Parameter Variations Within Substitutes:

Forward Voltage (Vf): Ranges from 490mV to 550mV at 2A (main part: 500mV)
Reverse Leakage Current: Ranges from 200µA to 500µA at 40V (main part: 500µA)
Operating Temperature Range: Extends to -65°C or 150°C in some variants (main part: -55°C to 125°C)

All substitute parts maintain RoHS3 compliance, MSL Level 1, and Active product status.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 2A [mV]	Reverse Leakage @ 40V [µA]	Package	Temp Range [°C]	Inventory [Pcs]
CDBM240-G	Comchip Technology	40	2	500	500	SOD-123T	-55 to 125	5200
CDBM240-HF	Comchip Technology	40	2	500	500	SOD-123T	-55 to 125	10100
B240A-E3/5AT	Vishay General Semiconductor	40	2	550	500	DO-214AC (SMA)	-65 to 150	51812
B240A-E3/61T	Vishay General Semiconductor	40	2	550	500	DO-214AC (SMA)	-65 to 150	43931
B240A-M3/61T	Vishay General Semiconductor	40	2	550	500	DO-214AC (SMA)	-65 to 150	10182
SS24S-E3/61T	Vishay General Semiconductor	40	2	550	200	DO-214AC (SMA)	-55 to 150	6616
SSA24-E3/5AT	Vishay General Semiconductor	40	2	490	200	DO-214AC (SMA)	-65 to 150	7262
SSA24-E3/61T	Vishay General Semiconductor	40	2	490	200	DO-214AC (SMA)	-65 to 150	1900

Engineering Selection Recommendations

Direct Replacement (No Design Changes Required):

CDBM240-HF is the direct parametric equivalent to CDBM240-G. Both parts share identical electrical specifications, SOD-123T package footprint, and compliance certifications. Selection between these two Comchip Technology variants depends on inventory availability and lead time requirements.

Functional Substitution (Package Footprint Change Required):

The Vishay General Semiconductor diodes (B240A series, SS24S series, SSA24 series) are functionally equivalent but require PCB layout modification due to the larger DO-214AC (SMA) package footprint. These parts are suitable for applications where:

PCB space permits the larger package dimensions
Design revision and re-layout are acceptable
Extended temperature range (-65°C to 150°C) provides operational margin beyond the main part specification

Compliance and Certification Status:

All listed substitute parts maintain:

RoHS3 Compliance
REACH Unaffected designation
MSL Level 1 (Unlimited moisture sensitivity)
Active product status
Fast Recovery Schottky technology (≤ 500ns, > 200mA)

Electrical Performance Considerations:

Forward voltage variation (490mV to 550mV at 2A) and reverse leakage current variation (200µA to 500µA at 40V) fall within acceptable ranges for Schottky diode rectifier applications. Selection should account for circuit power dissipation and leakage current sensitivity in the target application.

Frequently Asked Questions (FAQ)

Q1: Can CDBM240-HF be used as a direct drop-in replacement for CDBM240-G?

A: Yes. CDBM240-HF is a parametric equivalent with identical electrical specifications (40V, 2A, 500mV forward voltage, 500µA reverse leakage) and the same SOD-123T package. No design changes are required.

Q2: What is the primary difference between the Comchip CDBM240 series and the Vishay B240A/SS24S/SSA24 series?

A: The Comchip CDBM240-G and CDBM240-HF use the SOD-123T (Mini SMA) package, while the Vishay alternatives use the larger DO-214AC (SMA) package. All meet the same electrical requirements (40V, 2A, Schottky, fast recovery). Package selection depends on PCB layout constraints and available footprint space.

Q3: Are there differences in forward voltage between substitute parts?

A: Yes. The main part CDBM240-G specifies 500mV maximum forward voltage at 2A. Vishay B240A variants specify 550mV, while Vishay SSA24 variants specify 490mV. These variations are within normal Schottky diode tolerances and do not affect functional compatibility in standard rectifier applications.

Q4: Which substitute part has the lowest reverse leakage current?

A: SS24S-E3/61T and SSA24-E3/5AT and SSA24-E3/61T specify 200µA reverse leakage at 40V, compared to 500µA for the main part and other B240A variants. Lower leakage current may be beneficial in low-power or high-impedance circuit applications.

Q5: Do all substitute parts support the same operating temperature range as CDBM240-G?

A: No. The main part operates from -55°C to 125°C. Most Vishay substitutes extend to -65°C to 150°C, providing wider temperature margin. SS24S-E3/61T operates from -55°C to 150°C. Verify application temperature requirements before selection.

Q6: What packaging options are available for these Schottky diodes?

A: CDBM240-G and CDBM240-HF are supplied in Tape & Reel (TR) format in SOD-123T package. Vishay B240A variants are available in Cut Tape (CT) & Digi-Reel or Tape & Reel formats in DO-214AC package. SSA24 and SS24S variants are available in Cut Tape or Tape & Reel formats in DO-214AC package. Confirm packaging format requirements for your procurement and assembly process.

Q7: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the main part CDBM240-G certification level.

Q8: Which substitute part has the highest inventory availability?

A: B240A-E3/5AT (Vishay) has the highest inventory at 51,812 pieces. B240A-E3/61T follows with 43,931 pieces. If inventory availability is a critical factor, these Vishay variants offer supply security, provided the DO-214AC package footprint is acceptable for your design.

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