CDBA140SLR-HF Schottky Diode 40V 1A Equivalent & Substitute Parts

Part Overview

The CDBA140SLR-HF is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V reverse voltage and 1A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Equivalent parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating variations in forward voltage characteristics and leakage current parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	400 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1 mA @ 40 V	mA
Capacitance @ Vr, F	120pF @ 4V, 1MHz	pF
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-50°C ~ 150°C	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDBA140SLR-HF is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal 40V
Current - Average Rectified (Io): Must equal or exceed 1A
Package / Case: Must be DO-214AC (SMA) or equivalent surface mount configuration
Technology: Schottky diode type
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Acceptable range determined by circuit design tolerance
Current - Reverse Leakage @ Vr: Acceptable range determined by circuit design tolerance
Operating Temperature - Junction: Must support application temperature range
Moisture Sensitivity Level (MSL): Must be 1 (Unlimited) or equivalent

Substitute parts are grouped into two categories: Direct Current Rating Equivalents (1A rated) and Higher Current Capacity Alternatives (3A rated for applications requiring additional margin).

Parameter Comparison

Parameter	CDBA140SLR-HF (Main)	B140-13-F	B140Q-13-F	RB160L-40TE25	RB162L-40TE25	RB168L-40TFTE25	MBRA340T3G
Manufacturer	Comchip Technology	Diodes Incorporated	Diodes Incorporated	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor	onsemi
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A	1 A	3 A
Voltage - Forward (Vf) (Max) @ If	400 mV @ 2 A	500 mV @ 1 A	500 mV @ 1 A	550 mV @ 1 A	550 mV @ 1 A	650 mV @ 1 A	450 mV @ 3 A
Current - Reverse Leakage @ Vr	1 mA @ 40 V	500 µA @ 40 V	500 µA @ 40 V	100 µA @ 40 V	500 µA @ 40 V	550 nA @ 40 V	300 µA @ 40 V
Capacitance @ Vr, F	120pF @ 4V, 1MHz	110pF @ 4V, 1MHz	110pF @ 4V, 1MHz	—	—	—	—
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-50°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	150°C (Max)	150°C (Max)	150°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Not For New Designs	Not For New Designs	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Qualification	—	—	AEC-Q101	—	—	AEC-Q101	—

Engineering Selection Recommendations

For Direct Replacement (1A Current Rating):

B140-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains the 40V/1A electrical specification with active product status and ROHS3 compliance. Forward voltage is 500 mV @ 1A, representing a 100 mV increase from the original specification. Reverse leakage is 500 µA @ 40V, within acceptable tolerance for most applications. Operating temperature range extends to -65°C, providing improved low-temperature performance. High inventory availability (636,455 pcs) ensures supply continuity.

B140Q-13-F (Diodes Incorporated) provides identical electrical specifications to B140-13-F with the addition of AEC-Q101 automotive qualification. This part is required for automotive applications or designs requiring automotive-grade component certification. Inventory availability is 40,400 pcs.

RB168L-40TFTE25 (Rohm Semiconductor) is an active alternative with AEC-Q101 qualification and superior reverse leakage performance (550 nA @ 40V). Forward voltage is 650 mV @ 1A, representing a 250 mV increase from the original specification. This part is suitable for applications where low leakage current is critical. Limited inventory (1,146 pcs) may impact availability for high-volume production.

For Higher Current Capacity Applications:

MBRA340T3G (onsemi) provides 3A current rating with 40V reverse voltage specification. This part is suitable for applications requiring additional current margin or where the 1A rating is marginal. Forward voltage is 450 mV @ 3A, lower than the original specification. Product status is active with high inventory availability (20,300 pcs). This part is not recommended as a direct replacement but as an upgrade option for designs tolerating the higher current capacity.

Parts Not Recommended for New Designs:

RB160L-40TE25 and RB162L-40TE25 carry "Not For New Designs" product status and should not be selected for new applications despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can B140-13-F directly replace CDBA140SLR-HF without circuit modification?

A: B140-13-F is electrically compatible as a direct replacement. Both parts share 40V reverse voltage, 1A current rating, DO-214AC package, and fast recovery speed specifications. Forward voltage increases from 400 mV to 500 mV @ 1A; circuit designs must accommodate this 100 mV increase. Reverse leakage increases from 1 mA to 500 µA @ 40V, which is acceptable for most applications. No circuit modification is required for standard rectification applications.

Q: What is the difference between B140-13-F and B140Q-13-F?

A: Both parts are electrically identical with 40V/1A specifications and identical forward voltage and reverse leakage characteristics. B140Q-13-F includes AEC-Q101 automotive qualification, required for automotive applications or designs requiring automotive-grade certification. B140-13-F is suitable for industrial and consumer applications. Selection depends on application requirements and qualification mandates.

Q: Why does RB168L-40TFTE25 have higher forward voltage (650 mV) than the original part?

A: Forward voltage variation is a normal characteristic of Schottky diodes and depends on semiconductor material properties, junction design, and manufacturing process. RB168L-40TFTE25 exhibits superior reverse leakage performance (550 nA vs. 1 mA), which may result in higher forward voltage as a trade-off. Circuit designs must evaluate total power dissipation impact. This part is suitable for applications where low leakage current is critical.

Q: Is MBRA340T3G suitable as a direct replacement?

A: MBRA340T3G is not a direct replacement due to higher current rating (3A vs. 1A). This part is suitable for applications requiring additional current margin or where the 1A rating is marginal. Forward voltage is 450 mV @ 3A, lower than the original specification. Use this part only when circuit design explicitly requires or tolerates higher current capacity.

Q: What is the significance of "Not For New Designs" status for RB160L-40TE25 and RB162L-40TE25?

A: "Not For New Designs" indicates these parts are in mature or declining production phases and may face supply discontinuation. While electrically compatible, these parts should not be selected for new product designs. Existing designs using these parts may continue operation, but new designs should select active alternatives such as B140-13-F or RB168L-40TFTE25.

Q: Are all substitute parts ROHS3 compliant?

A: B140-13-F, B140Q-13-F, RB160L-40TE25, RB162L-40TE25, and RB168L-40TFTE25 are all ROHS3 compliant. MBRA340T3G compliance status is not specified in available data. Verify ROHS3 compliance with the manufacturer if required for your application.

Q: What packaging options are available for these substitute parts?

A: All substitute parts use DO-214AC (SMA) surface mount package, identical to the original CDBA140SLR-HF. Packaging variations exist in tape format: B140-13-F, B140Q-13-F, RB160L-40TE25, and RB162L-40TE25 are available in Cut Tape (CT) & Digi-Reel format. RB168L-40TFTE25 is available in Tape & Reel (TR) format. MBRA340T3G is available in Cut Tape (CT) & Digi-Reel format. Verify packaging format compatibility with assembly equipment before procurement.

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