Equivalent & Substitute Parts for B350A-13 Schottky Diode

Part Overview

The B350A-13 is a 50V, 3A Schottky rectifier diode manufactured by Diodes Incorporated in DO-214AC (SMA) surface mount package. This part is classified as discontinued at DiGi Electronics, necessitating identification of active equivalent and substitute components for ongoing production and repair applications. The device is qualified to AEC-Q101 automotive standards and operates across a junction temperature range of -55°C to 150°C. Equivalent parts maintain identical electrical specifications, while substitute parts offer functional compatibility within defined parameter tolerances for specific application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Max	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Max @ If	700 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 50 V
Capacitance @ Vr, F	200	pF @ 4V, 1MHz
Technology	Schottky	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the B350A-13 is determined by the following critical parameters:

Parametric Equivalents maintain all electrical specifications: 50V reverse voltage, 3A average rectified current, 700 mV forward voltage at 3A, fast recovery speed, and identical package (DO-214AC/SMA). These parts are direct functional replacements with no derating required.

Manufacturer-Recommended Substitutes are classified into two categories:

50V Rating Equivalents (B350A-M3/61T from Vishay): Maintain the 50V reverse voltage specification with 3A current rating and DO-214AC package. Minor variations in forward voltage (720 mV vs. 700 mV), reverse leakage (200 µA vs. 500 µA), and capacitance (145 pF vs. 200 pF) are within acceptable engineering tolerances for most applications.
40V Rating Substitutes (CDBA340-HF, RB056L-40TE25, RB058L-40TE25, SSA34HE3_A/H, SSA34HE3_A/I): These parts operate at 40V reverse voltage with 3A current rating. The 10V reduction in reverse voltage rating restricts use to applications where the circuit maximum voltage does not exceed 40V. These substitutes are suitable only when circuit design margins permit operation at the lower voltage rating.

Current-Reduced Substitutes (STPS140A, STPS140AY): These STMicroelectronics parts operate at 40V with 1A average rectified current. The 2A reduction in current capacity limits application to circuits requiring ≤1A average rectified current.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV @ If	Reverse Leakage µA @ Vr	Package	Product Status	RoHS	AEC-Q101
B350A-13	Diodes Inc.	50	3	700 @ 3A	500 @ 50V	DO-214AC	Discontinued	Non-compliant	Yes
B350A-13-F	Diodes Inc.	50	3	700 @ 3A	500 @ 50V	DO-214AC	Active	ROHS3	Yes
B350AQ-13-F	Diodes Inc.	50	3	700 @ 3A	500 @ 50V	DO-214AC	Active	ROHS3	Yes
B350A-M3/61T	Vishay	50	3	720 @ 3A	200 @ 50V	DO-214AC	Active	ROHS3	No
CDBA340-HF	Comchip	40	3	500 @ 3A	500 @ 40V	DO-214AC	Active	ROHS3	No
RB056L-40TE25	Rohm	40	3	670 @ 3A	50 @ 40V	DO-214AC	Not For New Designs	ROHS3	No
RB058L-40TE25	Rohm	40	3	700 @ 3A	5 @ 40V	DO-214AC	Not For New Designs	ROHS3	No
SSA34HE3_A/H	Vishay	40	3	490 @ 3A	200 @ 40V	DO-214AC	Active	ROHS3	Yes
SSA34HE3_A/I	Vishay	40	3	490 @ 3A	200 @ 40V	DO-214AC	Active	ROHS3	Yes
STPS140A	STMicroelectronics	40	1	550 @ 1A	12 @ 40V	DO-214AC	Active	ROHS3	No
STPS140AY	STMicroelectronics	40	1	650 @ 2A	12 @ 40V	DO-214AC	Active	ROHS3	No

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

B350A-13-F and B350AQ-13-F are parametric equivalents manufactured by Diodes Incorporated. Both maintain 50V reverse voltage, 3A current rating, and identical electrical characteristics. B350A-13-F is available in Cut Tape and Digi-Reel packaging with 35,400 units in stock. B350AQ-13-F is supplied in Tape & Reel format with 1,130 units available. Both parts are ROHS3 compliant and AEC-Q101 qualified, addressing the RoHS non-compliance of the original B350A-13.

For 50V Applications Requiring Active Status:

B350A-M3/61T from Vishay General Semiconductor maintains the 50V reverse voltage and 3A current specification. Forward voltage increases marginally to 720 mV (versus 700 mV), and reverse leakage decreases to 200 µA. This part is ROHS3 compliant and actively produced with 3,331 units in stock. AEC-Q101 qualification is not listed; verify automotive qualification requirements before selection.

For 40V Circuit Applications:

CDBA340-HF (Comchip), SSA34HE3_A/H, and SSA34HE3_A/I (Vishay) are suitable only when circuit maximum voltage does not exceed 40V. SSA34HE3_A/H and SSA34HE3_A/I offer AEC-Q101 qualification and automotive-grade designation. SSA34HE3_A/I provides superior inventory availability (192,600 units) in Cut Tape format. CDBA340-HF offers the lowest forward voltage (500 mV) with highest inventory (655,100 units).

Not Recommended for New Designs:

RB056L-40TE25 and RB058L-40TE25 from Rohm Semiconductor are marked "Not For New Designs" and should be avoided for new product development despite active inventory availability.

Current-Limited Substitutes:

STPS140A and STPS140AY are restricted to applications requiring ≤1A average rectified current and are not suitable for the 3A specification of B350A-13.

Frequently Asked Questions (FAQ)

Q: Can B350A-13-F be used as a direct replacement for B350A-13?

A: Yes. B350A-13-F is a parametric equivalent with identical electrical specifications (50V, 3A, 700 mV forward voltage). The primary differences are product status (Active vs. Discontinued) and RoHS compliance (ROHS3 vs. non-compliant). Both are AEC-Q101 qualified and use DO-214AC packaging.

Q: What is the difference between B350A-13-F and B350AQ-13-F?

A: Both are parametric equivalents with identical electrical specifications. The primary difference is packaging format: B350A-13-F is supplied in Cut Tape and Digi-Reel, while B350AQ-13-F is supplied in Tape & Reel. Selection depends on assembly equipment compatibility and volume requirements.

Q: Can I use a 40V-rated diode in place of the 50V B350A-13?

A: Only if circuit design ensures maximum voltage does not exceed 40V. Parts such as CDBA340-HF, SSA34HE3_A/H, and SSA34HE3_A/I operate at 40V maximum reverse voltage. Using these in circuits designed for 50V operation creates risk of diode failure. Verify circuit voltage margins before substitution.

Q: Why is B350A-M3/61T from Vishay listed as a substitute despite different forward voltage?

A: B350A-M3/61T maintains the critical 50V reverse voltage and 3A current rating. The forward voltage increase from 700 mV to 720 mV (20 mV difference) is within typical engineering tolerance for most rectifier applications. Reverse leakage improvement (200 µA vs. 500 µA) is beneficial. Verify forward voltage drop impact on specific circuit performance before selection.

Q: Are STPS140A and STPS140AY suitable replacements?

A: No. These parts are rated for 1A average rectified current, not 3A. They are suitable only for applications requiring ≤1A current. Using these in 3A circuits results in device overstress and failure.

Q: What does "Not For New Designs" mean for Rohm parts?

A: This designation indicates the manufacturer is discontinuing or has discontinued the product line. While inventory may be available, these parts should not be selected for new product development. Use active alternatives such as SSA34HE3_A/H or CDBA340-HF instead.

Q: Does packaging format affect electrical performance?

A: No. Cut Tape, Digi-Reel, and Tape & Reel formats contain identical die and electrical specifications. Packaging selection is determined by assembly equipment compatibility and volume requirements, not electrical performance.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification certifies the diode meets automotive industry reliability and quality standards. B350A-13, B350A-13-F, B350AQ-13-F, SSA34HE3_A/H, and SSA34HE3_A/I carry this qualification. Parts without AEC-Q101 (such as B350A-M3/61T and CDBA340-HF) may require additional qualification verification for automotive applications.

Q: Is RoHS3 compliance mandatory for replacement?

A: RoHS3 compliance is required for products sold into European Union markets and many other regions. B350A-13 is RoHS non-compliant. All recommended active equivalents (B350A-13-F, B350AQ-13-F, B350A-M3/61T, CDBA340-HF, SSA34HE3_A/H, SSA34HE3_A/I) are ROHS3 compliant, addressing regulatory requirements.

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