B250A-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The B250A-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 2 A average rectified current in a surface mount SMA (DO-214AC) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and repair applications. The device features fast recovery characteristics suitable for high-frequency switching applications with a maximum forward voltage of 700 mV at 2 A.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 2 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 50 V	—
Capacitance @ Vr, F	200pF @ 4V, 1MHz	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65°C ~ 150°C	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the B250A-13 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Package / Case: Must be DO-214AC (SMA) or compatible surface mount package
Technology: Schottky diode type
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Categories:

Category 1: Direct Parametric Equivalent Parts that match all electrical specifications and package requirements with identical or superior ratings.

Category 2: Voltage-Reduced Substitutes Parts with lower maximum reverse voltage (40 V instead of 50 V) suitable only for applications where the circuit operates below 40 V. These parts maintain 2 A current rating and SMA package compatibility.

Category 3: Current-Reduced Substitutes Parts with lower average rectified current (1 A instead of 2 A) suitable only for applications requiring less than 1 A. These parts maintain 40 V voltage rating and SMA package compatibility.

Category 4: Package-Variant Substitutes Parts with identical electrical specifications but different surface mount packages (DO-214AA/SMB instead of DO-214AC/SMA).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Package	Product Status	RoHS Status
B250A-13	Diodes Incorporated	50	2	700 @ 2A	DO-214AC, SMA	Discontinued	RoHS non-compliant
B250A-13-F	Diodes Incorporated	50	2	700 @ 2A	DO-214AC, SMA	Active	ROHS3 Compliant
B240A-M3/61T	Vishay General Semiconductor - Diodes Division	40	2	550 @ 2A	DO-214AC, SMA	Active	ROHS3 Compliant
SS24S-E3/5AT	Vishay General Semiconductor - Diodes Division	40	2	550 @ 2A	DO-214AC, SMA	Active	ROHS3 Compliant
SS25	Taiwan Semiconductor Corporation	50	2	700 @ 2A	DO-214AA, SMB	Active	ROHS3 Compliant
SS25-LTP	Micro Commercial Co	50	2	700 @ 2A	DO-214AC, SMA	Not For New Designs	ROHS3 Compliant
STPS140A	STMicroelectronics	40	1	550 @ 1A	DO-214AC, SMA	Active	ROHS3 Compliant
STPS140AY	STMicroelectronics	40	1	650 @ 2A	DO-214AC, SMA	Active	ROHS3 Compliant
STPS1L40A	STMicroelectronics	40	1	500 @ 1A	DO-214AC, SMA	Active	ROHS3 Compliant
STPS1L40AY	STMicroelectronics	40	1	500 @ 1A	DO-214AC, SMA	Active	ROHS3 Compliant
VS-15MQ040-M3/5AT	Vishay General Semiconductor - Diodes Division	40	1.5	430 @ 1.5A	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitute: B250A-13-F

The B250A-13-F is the direct parametric equivalent manufactured by Diodes Incorporated. This part maintains identical electrical specifications (50 V, 2 A, 700 mV forward voltage) and package configuration (DO-214AC, SMA). The B250A-13-F is in active production status with ROHS3 compliance, addressing the RoHS non-compliance limitation of the original B250A-13. This substitution requires no circuit redesign or thermal management adjustments.

Alternative Substitutes for Voltage-Reduced Applications:

When circuit design permits operation below 40 V maximum reverse voltage, the following parts provide active production status and ROHS3 compliance:

B240A-M3/61T (Vishay): 40 V, 2 A, 550 mV forward voltage. Maintains full 2 A current rating with improved forward voltage characteristics.
SS24S-E3/5AT (Vishay): 40 V, 2 A, 550 mV forward voltage. Provides lower reverse leakage (200 µA @ 40 V) compared to the original specification.
VS-15MQ040-M3/5AT (Vishay): 40 V, 1.5 A, 430 mV forward voltage. Suitable for applications requiring 1.5 A or less with superior forward voltage performance.

Alternative Substitute for Package-Variant Applications:

SS25 (Taiwan Semiconductor Corporation): Maintains 50 V, 2 A specifications with identical forward voltage (700 mV @ 2 A). Package differs as DO-214AA (SMB) instead of DO-214AC (SMA). This substitution requires PCB layout modification to accommodate the larger SMB footprint.

Not Recommended for New Designs:

SS25-LTP (Micro Commercial Co): Marked as "Not For New Designs" despite meeting electrical specifications. This status indicates manufacturer discontinuation trajectory.

Current-Reduced Substitutes (1 A Rating):

The following parts are suitable only for applications requiring maximum 1 A average rectified current:

STPS140A (STMicroelectronics): 40 V, 1 A, 550 mV forward voltage
STPS140AY (STMicroelectronics): 40 V, 1 A, 650 mV forward voltage (Automotive grade)
STPS1L40A (STMicroelectronics): 40 V, 1 A, 500 mV forward voltage
STPS1L40AY (STMicroelectronics): 40 V, 1 A, 500 mV forward voltage (Automotive grade)

Frequently Asked Questions (FAQ)

Q: Can I use B250A-13-F as a direct replacement for B250A-13?

A: Yes. The B250A-13-F is a direct parametric equivalent with identical electrical specifications (50 V, 2 A, 700 mV forward voltage) and package configuration (DO-214AC, SMA). The primary difference is product status (Active vs. Discontinued) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between DO-214AC (SMA) and DO-214AA (SMB) packages?

A: DO-214AC (SMA) and DO-214AA (SMB) are both surface mount packages for Schottky diodes but differ in physical dimensions. SMB packages are larger than SMA packages. Substitution between these packages requires PCB layout modification to accommodate the different footprint. The SS25 part uses DO-214AA (SMB) packaging.

Q: Can I use a 40 V rated diode in a circuit designed for 50 V?

A: No. The 40 V maximum reverse voltage rating is an absolute maximum rating. Using a 40 V diode in a circuit with 50 V reverse voltage exposure will result in device failure. Parts such as B240A-M3/61T, SS24S-E3/5AT, and the STPS series (40 V rated) are suitable only for circuits operating at or below 40 V maximum reverse voltage.

Q: Can I use a 1 A rated diode in a circuit designed for 2 A?

A: No. The 1 A average rectified current rating is an absolute maximum rating. Using a 1 A diode in a circuit requiring 2 A will result in device failure due to thermal stress. The STPS140A, STPS140AY, STPS1L40A, and STPS1L40AY parts are rated for 1 A maximum and are unsuitable for 2 A applications. The VS-15MQ040-M3/5AT is rated for 1.5 A and is unsuitable for 2 A applications.

Q: What does RoHS compliance mean for this component?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the component does not contain restricted materials such as lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers above specified thresholds. ROHS3 compliance is required for many applications, particularly in consumer electronics and regulated industries. The original B250A-13 is RoHS non-compliant, while B250A-13-F and all listed substitutes are ROHS3 compliant.

Q: Why are some parts marked "Not For New Designs"?

A: Parts marked "Not For New Designs" indicate the manufacturer is discontinuing the product line. While the part may still be available in inventory, manufacturers recommend against using these components in new circuit designs. The SS25-LTP carries this designation despite meeting electrical specifications.

Q: What is the significance of forward voltage (Vf) differences between substitutes?

A: Forward voltage determines the voltage drop across the diode during conduction. Lower forward voltage reduces power dissipation and heat generation. For example, VS-15MQ040-M3/5AT has 430 mV forward voltage compared to 700 mV for the original B250A-13, resulting in approximately 39% lower forward voltage drop. This difference affects circuit efficiency and thermal management but does not affect substitution compatibility if the circuit design accommodates the lower voltage drop.

Q: Can I use an automotive-grade diode (STPS140AY or STPS1L40AY) in a non-automotive application?

A: Yes. Automotive-grade components meet additional qualification and reliability requirements beyond standard industrial grades. Using automotive-grade components in non-automotive applications provides enhanced reliability margins without adverse effects. However, automotive-grade parts are typically more expensive and should be used only when the additional qualification is justified.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) and Tape & Reel (TR) refer to the supply format, not the component itself. Tape & Reel (TR) provides components on continuous tape suitable for automated assembly equipment, while Cut Tape (CT) provides components on tape segments. Both formats contain identical components. Selection depends on assembly process requirements and volume. The B250A-13-F is supplied in Tape & Reel format, while the original B250A-13 packaging format is not specified.

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