CDBM140L-G Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBM140L-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount SOD-123T package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within specified parameters while offering active product status and improved availability.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40 V	V
Current - Average Rectified (Io)	1 A	A
Voltage - Forward (Vf) (Max) @ If	400 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
Current - Reverse Leakage @ Vr	1 mA @ 40 V	mA
Mounting Type	Surface Mount	—
Package / Case	SOD-123T	—
Operating Temperature - Junction	-55°C to 100°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDBM140L-G is determined by the following critical parameters:

Electrical Compatibility Criteria:

Technology: Schottky diode type
Current Rating: 1 A average rectified current (Io)
Voltage Rating: Minimum 40 V DC reverse voltage (Vr)
Forward Voltage: Maximum 400 mV @ 1 A (preferred) or within acceptable operating margin
Speed: Fast recovery ≤ 500 ns for > 200 mA (Io)
Reverse Leakage: Maximum 1 mA @ 40 V (preferred) or within acceptable operating margin

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: SOD-123T or equivalent footprint
Operating Temperature Range: Minimum -55°C to 100°C

Compliance Criteria:

RoHS3 Compliant
MSL 1 (Unlimited)

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalent (Same Voltage Rating)

CDBM140L-HF (Comchip Technology): Identical electrical specifications, active product status, tape & reel packaging

Category 2: Functional Substitutes (Lower Voltage Rating, Higher Performance)

B120-E3/5AT, B120-E3/61T, B120-M3/5AT (Vishay): 20 V rating (derated from 40 V), 1 A current, DO-214AC package
CD1607-B120LLF (Bourns): 20 V rating, 1 A current, SOD-123T package, lower forward voltage
MBRA120ET3G (onsemi): 20 V rating, 1 A current, DO-214AC package
SS12-E3/5AT, SS12-E3/61T, SS12-LTP (Vishay / Micro Commercial Co): 20 V rating, 1 A current, DO-214AC package

Functional substitutes operate at reduced voltage ratings (20 V vs. 40 V) and are suitable for applications where the circuit voltage does not exceed 20 V DC. These parts offer superior availability and active product status.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Package	Product Status	Inventory [Pcs]
CDBM140L-G	Comchip Technology	40	1	400	SOD-123T	Obsolete	895
CDBM140L-HF	Comchip Technology	40	1	400	SOD-123T	Active	807
B120-E3/5AT	Vishay	20	1	520	DO-214AC	Active	7762
B120-E3/61T	Vishay	20	1	520	DO-214AC	Active	25300
B120-M3/5AT	Vishay	20	1	520	DO-214AC	Active	799
CD1607-B120LLF	Bourns Inc.	20	1	380	SOD-123T	Active	857
MBRA120ET3G	onsemi	20	1	530	DO-214AC	Active	16601
SS12-E3/5AT	Vishay	20	1	500	DO-214AC	Active	5800
SS12-E3/61T	Vishay	20	1	500	DO-214AC	Active	71923
SS12-LTP	Micro Commercial Co	20	1	500	DO-214AC	Not For New Designs	10100

Engineering Selection Recommendations

Primary Recommendation: CDBM140L-HF

The CDBM140L-HF is the direct parametric equivalent to the obsolete CDBM140L-G. This part maintains identical electrical specifications (40 V, 1 A, 400 mV forward voltage) and package form factor (SOD-123T). The CDBM140L-HF carries active product status and ROHS3 compliance. Selection of this part eliminates design modification requirements and maintains full voltage margin for 40 V applications. Current inventory of 807 units supports production requirements.

Secondary Recommendation for 20 V Applications: SS12-E3/61T

For applications where circuit voltage does not exceed 20 V DC, the SS12-E3/61T (Vishay) offers superior availability with 71,923 units in stock. This part maintains 1 A current rating and fast recovery speed. The 20 V voltage rating is suitable for circuits operating below this threshold. Forward voltage of 500 mV @ 1 A is within acceptable operating margin. Active product status and ROHS3 compliance are confirmed. Tape & reel packaging (61T) supports high-volume production.

Alternative for 20 V Applications: CD1607-B120LLF

The CD1607-B120LLF (Bourns) maintains the SOD-123T package footprint of the original part, eliminating PCB layout modifications. This part is rated for 20 V and 1 A with forward voltage of 380 mV @ 1 A (lower than the original specification). Active product status and ROHS3 compliance are confirmed. This option is preferred when PCB footprint compatibility is critical and circuit voltage is confirmed below 20 V.

Not Recommended for New Designs: SS12-LTP

The SS12-LTP carries product status designation "Not For New Designs" and is not suitable for new development projects despite adequate inventory availability.

Frequently Asked Questions (FAQ)

Q1: Can I use a 20 V rated diode in place of the 40 V CDBM140L-G?

A: A 20 V rated diode can be used only if your circuit voltage does not exceed 20 V DC. The voltage rating represents the maximum reverse voltage the diode can withstand. If your application requires 40 V reverse voltage capability, you must use a 40 V or higher rated part. The CDBM140L-HF is the appropriate choice for 40 V applications.

Q2: What is the difference between CDBM140L-G and CDBM140L-HF?

A: Both parts are manufactured by Comchip Technology with identical electrical specifications (40 V, 1 A, 400 mV forward voltage) and SOD-123T packaging. The primary difference is product status: CDBM140L-G is obsolete, while CDBM140L-HF is active. The CDBM140L-HF is the direct replacement for the obsolete part.

Q3: Why do substitute parts have different package designations (DO-214AC vs. SOD-123T)?

A: DO-214AC and SOD-123T are different package standards for surface mount diodes. While both are surface mount packages, they have different physical dimensions and PCB footprints. Parts with DO-214AC packaging (B120 series, SS12 series, MBRA120ET3G) require PCB layout modification if the original design used SOD-123T. The CD1607-B120LLF maintains SOD-123T packaging and does not require layout changes.

Q4: What does "Not For New Designs" mean for the SS12-LTP?

A: "Not For New Designs" indicates that the manufacturer (Micro Commercial Co) has designated this part as obsolete or end-of-life for new product development. While inventory may be available, this part should not be selected for new designs. Active alternatives such as SS12-E3/61T should be used instead.

Q5: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference carry ROHS3 Compliant status, matching the compliance requirement of the original CDBM140L-G. All parts also carry MSL 1 (Unlimited) moisture sensitivity level.

Q6: Which substitute part has the lowest forward voltage?

A: The CD1607-B120LLF (Bourns) has the lowest forward voltage at 380 mV @ 1 A, compared to 400 mV for the original CDBM140L-G. However, this part is rated for 20 V maximum reverse voltage and is suitable only for applications not exceeding 20 V.

Q7: What is the difference between tape & reel (TR) and cut tape (CT) packaging?

A: Tape & reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut tape (CT) packaging supplies components on tape segments, suitable for lower-volume or manual assembly. Both packaging formats contain identical components; the difference is in delivery format and handling method.

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