CDBA340LR-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBA340LR-HF is a 40V, 3A Schottky rectifier diode manufactured by Comchip Technology in DO-214AC (SMA) surface mount package. This component is classified as Active product status and is widely used in power conversion, reverse polarity protection, and high-frequency rectification applications requiring fast recovery characteristics.

Substitute parts are necessary when the primary component experiences supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified manufacturers. All substitute parts listed maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Capacitance @ Vr, F	250	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-50°C ~ 150°C	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the CDBA340LR-HF is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
Current - Average Rectified (Io): Must equal or exceed 3A
Technology: Schottky (mandatory)
Package / Case: DO-214AC, SMA (mandatory for mechanical compatibility)
Mounting Type: Surface Mount (mandatory)

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Forward voltage drop must not exceed application circuit limits
Speed: Fast Recovery characteristic required for switching applications
Operating Temperature - Junction: Must support application temperature range
RoHS Status: ROHS3 Compliant (mandatory for regulatory compliance)
Moisture Sensitivity Level (MSL): Level 1 (Unlimited) preferred for manufacturing flexibility

Substitute Parts Classified by Compatibility:

Group A - Full Electrical & Mechanical Equivalents (40V, 3A, DO-214AC):

SK34A-LTP (Micro Commercial Co) — Active status, identical ratings
RB056L-40TE25 (Rohm Semiconductor) — Not For New Designs status
RB050L-40TE25 (Rohm Semiconductor) — Not For New Designs status

Group B - Voltage Downrated Substitute (20V, 3A, DO-214AC):

RB051L-40TE25 (Rohm Semiconductor) — Not For New Designs status, 20V maximum (suitable only for applications with ≤20V reverse voltage requirement)

Group C - Current Downrated Substitute (40V, 1A, SMA):

B140-13-F (Diodes Incorporated) — Active status, reduced current rating (suitable only for applications with ≤1A average rectified current requirement)

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Temp Range [°C]	Product Status	Reverse Leakage @ Vr [µA]
CDBA340LR-HF	Comchip Technology	40	3	450 @ 3A	DO-214AC (SMA)	-50 ~ 150	Active	500 @ 40V
SK34A-LTP	Micro Commercial Co	40	3	500 @ 3A	DO-214AC (SMA)	-50 ~ 125	Active	500 @ 40V
RB056L-40TE25	Rohm Semiconductor	40	3	670 @ 3A	DO-214AC (SMA)	—	Not For New Designs	50 @ 40V
RB050L-40TE25	Rohm Semiconductor	40	3	550 @ 3A	DO-214AC (SMA)	125 (Max)	Not For New Designs	1000 @ 40V
RB051L-40TE25	Rohm Semiconductor	20	3	450 @ 3A	DO-214AC (SMA)	125 (Max)	Not For New Designs	1000 @ 20V
B140-13-F	Diodes Incorporated	40	1	500 @ 1A	DO-214AC (SMA)	-65 ~ 150	Active	500 @ 40V

Engineering Selection Recommendations

Recommended Primary Substitutes (Full Compatibility):

SK34A-LTP — Preferred substitute for new designs and ongoing production. Maintains Active product status, identical voltage and current ratings (40V, 3A), and equivalent electrical performance. Operating temperature range (-50°C ~ 125°C) is suitable for most industrial and consumer applications. Forward voltage specification (500 mV @ 3A) is within acceptable tolerance for power conversion circuits.

Conditional Substitutes (Application-Dependent):

RB056L-40TE25, RB050L-40TE25 — These Rohm Semiconductor parts carry "Not For New Designs" product status and should be used only for replacement or legacy system maintenance. Both maintain 40V, 3A electrical ratings and DO-214AC packaging. Forward voltage characteristics differ (670 mV and 550 mV respectively), requiring thermal analysis in power-sensitive applications. Maximum junction temperature specification (125°C) is lower than the primary part, limiting use in high-temperature environments.

RB051L-40TE25 — Voltage rating reduced to 20V maximum. Use only in applications where reverse voltage does not exceed 20V. Not For New Designs status applies. Not suitable as general replacement.

B140-13-F — Current rating reduced to 1A maximum. Use only in applications where average rectified current does not exceed 1A. Active product status permits new design use within current limitations. Not suitable as general replacement for 3A applications.

Compliance & Certification:

All listed substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring compatibility with standard manufacturing processes and supply chain requirements. REACH Unaffected status applies uniformly across all parts.

Frequently Asked Questions (FAQ)

Q: Can I use B140-13-F as a direct replacement for CDBA340LR-HF?

A: No. B140-13-F has a maximum average rectified current rating of 1A, while CDBA340LR-HF is rated for 3A. Use B140-13-F only in applications requiring ≤1A current. For 3A applications, select SK34A-LTP, RB056L-40TE25, or RB050L-40TE25.

Q: Can I use RB051L-40TE25 as a direct replacement for CDBA340LR-HF?

A: No. RB051L-40TE25 has a maximum reverse voltage rating of 20V, while CDBA340LR-HF is rated for 40V. Use RB051L-40TE25 only in applications with reverse voltage ≤20V. For 40V applications, select SK34A-LTP, RB056L-40TE25, or RB050L-40TE25.

Q: What is the difference between "Active" and "Not For New Designs" product status?

A: Active status indicates the manufacturer continues production and recommends the part for new designs. Not For New Designs status indicates the manufacturer maintains production for legacy support only and does not recommend use in new circuit designs. For new designs, prioritize Active status parts (CDBA340LR-HF or SK34A-LTP).

Q: Are all substitute parts in the same DO-214AC package?

A: Yes. All listed substitute parts use DO-214AC (SMA) surface mount package, ensuring mechanical and footprint compatibility on printed circuit boards.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) determines voltage drop across the diode during conduction. CDBA340LR-HF specifies 450 mV @ 3A. Substitutes range from 450 mV to 670 mV. Higher forward voltage increases power dissipation and heat generation. Verify that circuit design accommodates the forward voltage specification of the selected substitute, particularly in low-voltage or high-current applications.

Q: What is the significance of reverse leakage current?

A: Reverse leakage current (Ir) flows when the diode is reverse-biased. CDBA340LR-HF specifies 500 µA @ 40V. Higher leakage (as in RB050L-40TE25 and RB051L-40TE25 at 1000 µA) increases standby power consumption and may affect circuit performance in precision analog applications. Lower leakage (RB056L-40TE25 at 50 µA) improves efficiency.

Q: Can I use these diodes in high-temperature applications?

A: Operating temperature range varies by part. CDBA340LR-HF supports -50°C ~ 150°C. SK34A-LTP supports -50°C ~ 125°C. RB050L-40TE25 and RB051L-40TE25 specify 125°C maximum. For applications exceeding 125°C, use CDBA340LR-HF or SK34A-LTP.

Q: Are all parts RoHS3 compliant?

A: Yes. All listed parts carry ROHS3 Compliant status and Moisture Sensitivity Level 1 (Unlimited), meeting environmental and manufacturing requirements for standard production environments.

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