MBR1635 Schottky Diode Equivalent & Substitute Parts

Part Overview

The MBR1635 is a 35V, 16A Schottky rectifier diode in TO-220AC package manufactured by Diodes Incorporated. This component is classified as obsolete, indicating discontinued production and limited availability. The MBR1635 serves as a high-speed rectification element in power conversion circuits, switching power supplies, and freewheeling applications where fast recovery and low forward voltage drop are required.

Due to obsolete status, equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for production and field service applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	35	V
Current - Average Rectified (Io)	16	A
Voltage - Forward (Vf) (Max) @ If	630 mV @ 16 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 35 V
Mounting Type	Through Hole	—
Package / Case	TO-220-2	—
Operating Temperature - Junction	-65 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MBR1635 is determined by the following critical parameters:

Voltage Rating (Vr): The reverse voltage rating must equal or exceed 35V to maintain circuit protection and reliability margins.

Current Rating (Io): The average rectified current must equal or exceed 16A to handle the design load without thermal stress or component failure.

Forward Voltage (Vf): The forward voltage drop at rated current must not exceed 630 mV @ 16A to preserve power efficiency and thermal performance.

Recovery Speed: Fast recovery characteristics (≤ 500ns, > 200mA) are required for switching applications to minimize switching losses and electromagnetic interference.

Reverse Leakage Current: Maximum leakage of 200 µA @ 35V ensures acceptable standby power consumption and circuit performance.

Package and Mounting: TO-220-2 through-hole package maintains mechanical and thermal compatibility with existing PCB designs.

Operating Temperature Range: Junction temperature range of -65°C to 150°C establishes the thermal operating envelope.

Substitute parts are classified into three categories:

Direct Manufacturer Equivalent: Identical electrical specifications and package; different manufacturer or variant designation.

Manufacturer Recommended Substitute: Meets or exceeds all critical parameters; may have higher voltage or current ratings; maintains functional compatibility.

Parametric Equivalent: Matches all electrical specifications; may have different capacitance characteristics or packaging variants.

Parameter Comparison

Parameter	MBR1635	MBR1635-E3/45	VS-MBR1635-M3	STPS1545D	MBR735G
Manufacturer	Diodes Inc.	Vishay	Vishay	STMicroelectronics	onsemi
Voltage - DC Reverse (Vr) (Max)	35 V	35 V	35 V	45 V	35 V
Current - Average Rectified (Io)	16 A	16 A	16 A	15 A	7.5 A
Voltage - Forward (Vf) (Max) @ If	630 mV @ 16 A	630 mV @ 16 A	630 mV @ 16 A	840 mV @ 30 A	840 mV @ 15 A
Speed	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Current - Reverse Leakage @ Vr	200 µA @ 35 V	200 µA @ 35 V	200 µA @ 35 V	200 µA @ 45 V	100 µA @ 35 V
Package / Case	TO-220-2	TO-220-2	TO-220-2	TO-220-2	TO-220-2
Operating Temperature - Junction	-65 to 150 °C	-65 to 150 °C	-65 to 150 °C	Max 175 °C	-65 to 175 °C
Product Status	Obsolete	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MBR1635-E3/45 (Vishay General Semiconductor - Diodes Division)

This part is a direct manufacturer equivalent with identical electrical specifications to the MBR1635. It maintains 35V reverse voltage, 16A average rectified current, and 630 mV forward voltage drop. The MBR1635-E3/45 is in active production status, ensuring long-term availability. ROHS3 compliance and REACH unaffected status confirm regulatory alignment. This substitute is the primary choice for direct replacement in existing designs.

VS-MBR1635-M3 (Vishay General Semiconductor - Diodes Division)

This parametric equivalent matches all critical electrical specifications: 35V reverse voltage, 16A current rating, and 630 mV forward voltage. Active product status guarantees supply continuity. REACH unaffected designation confirms regulatory compliance. Capacitance specification differs (1400pF @ 5V, 1MHz versus 450pF @ 4V, 1MHz), which may affect high-frequency circuit behavior. This substitute is suitable for applications where capacitance variation is acceptable.

STPS1545D (STMicroelectronics)

This manufacturer-recommended substitute provides enhanced specifications: 45V reverse voltage (10V higher than MBR1635) and 15A average rectified current (1A lower than MBR1635). Forward voltage is 840 mV @ 30A, representing higher conduction losses compared to the MBR1635. Active production status and ROHS3 compliance ensure availability and regulatory compliance. The higher voltage rating provides additional circuit protection margin. This substitute is appropriate for designs tolerating higher forward voltage drop or requiring enhanced reverse voltage capability.

MBR735G (onsemi)

This part has reduced current rating (7.5A versus 16A) and higher forward voltage (840 mV @ 15A). While it maintains 35V reverse voltage and fast recovery characteristics, the lower current capacity restricts its use to applications with reduced load requirements. Obsolete product status limits long-term availability. This substitute is not recommended for direct replacement of the MBR1635 in full-current applications.

Frequently Asked Questions (FAQ)

Q: Can MBR1635-E3/45 directly replace MBR1635 in all applications?

A: Yes. The MBR1635-E3/45 is a direct equivalent with identical voltage, current, and forward voltage specifications. It uses the same TO-220-2 package and maintains the same operating temperature range. Active production status provides superior availability compared to the obsolete MBR1635.

Q: What is the difference between MBR1635-E3/45 and VS-MBR1635-M3?

A: Both parts match the MBR1635 electrical specifications. The primary difference is capacitance: MBR1635-E3/45 has 450pF @ 4V, 1MHz, while VS-MBR1635-M3 has 1400pF @ 5V, 1MHz. Higher capacitance may affect switching frequency response and EMI characteristics. Both are active products from Vishay.

Q: Why is STPS1545D listed as a substitute if it has lower current rating (15A versus 16A)?

A: STPS1545D is classified as a manufacturer-recommended substitute because it meets the critical voltage requirement (45V, exceeding the 35V specification) and maintains fast recovery characteristics. The 15A current rating is within 1A of the MBR1635 specification and is acceptable for most applications. The higher voltage rating provides additional design margin.

Q: Is MBR735G suitable for replacing MBR1635?

A: No. MBR735G has a current rating of 7.5A, which is insufficient for applications requiring the full 16A capacity of the MBR1635. Additionally, MBR735G is obsolete, limiting availability. This part is suitable only for applications with reduced current requirements.

Q: What is the impact of higher forward voltage in STPS1545D?

A: STPS1545D has 840 mV forward voltage drop compared to 630 mV in the MBR1635. This 210 mV difference increases power dissipation and heat generation at rated current. In high-current applications, this may require thermal design review. For low-current or intermittent-duty applications, the impact is minimal.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MBR1635-E3/45, VS-MBR1635-M3, STPS1545D, and MBR735G) are ROHS3 compliant, ensuring compatibility with environmental and regulatory requirements.

Q: Which substitute has the best long-term availability?

A: MBR1635-E3/45 and VS-MBR1635-M3 are both active products from Vishay with confirmed inventory levels (3100 and 785 units respectively). STPS1545D from STMicroelectronics is also active with the highest inventory (35200 units). MBR735G and the original MBR1635 are both obsolete.

Q: Can I use STPS1545D in a design originally specified for MBR1635?

A: STPS1545D is functionally compatible for most applications. The 45V rating provides additional reverse voltage margin. However, the 210 mV higher forward voltage drop increases power dissipation. Thermal analysis is required to confirm that heat dissipation remains within acceptable limits for your specific application.

Q: What is the difference between TO-220-2 and TO-220AC packaging?

A: Both designations refer to the same physical package: a three-lead through-hole component with two electrical terminals (anode and cathode) and one mounting tab. TO-220AC is the supplier device package designation used by some manufacturers. All listed parts use compatible TO-220-2 packages suitable for existing PCB designs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message