MMBD1503A | diode | equivalent | Fairchild Rectron USA
- Voltage-DCReverse(Vr)(Max): 200 V
- Current-AverageRectified(Io)(perDiode): 200mA
- Voltage-Forward(Vf)(Max)@If: 1.3 V @ 200 mA
- Package: TO-236-3, SC-59, SOT-23-3

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MMBD1503A
The MMBD1503A is a surface-mount high-speed switching diode, commonly packaged in the SOT-23 format. It features a fast switching speed, compact size, and low power consumption. The diode supports a maximum reverse voltage of 200V and a maximum forward current of approximately 200mA. Typically, it’s used in high-speed switching circuits, signal rectification, and small-signal detection applications. Thanks to its high reliability and stable performance, it’s widely used in communication equipment, portable electronics, and consumer electronic devices.
MMBD1503A pinout
Pin Number | Pin Name | Description |
---|---|---|
1 | Anode | Positive terminal of diode |
2 | K | common port |
3 | Cathode | Negative terminal of diode |
Note: The MMBD1503A is typically used in high-speed switching and general-purpose diode applications. Be cautious when soldering to avoid damage due to excessive heat.
MMBD1503A equivalent diode
Part Number | Manufacturer | Package | Reverse Voltage | Max Current | Operating Temperature | Remarks |
---|---|---|---|---|---|---|
MMBD1505A | onsemi | SOT-23 | 200 V | 200 mA | -55°C to +150°C | Similar to MMBD1503A with different configuration. |
BAS21SLT1G | onsemi | SOT-23 | 250 V | 200 mA | -55°C to +150°C | Higher reverse voltage rating. |
BAS21S_R1_00001 | Panjit | SOT-23 | 250 V | 200 mA | -55°C to +150°C | Similar to BAS21SLT1G. |
CMPD3003S | Central Semi | SOT-23 | 200 V | 200 mA | -55°C to +150°C | Direct replacement for MMBD1503A. |
GSD2004S-E3-18 | Vishay | SOT-23 | 200 V | 200 mA | -55°C to +150°C | Direct replacement for MMBD1503A. |
All listed models share similar electrical characteristics and the same SOT-23 package, making them suitable substitutes for the MMBD1503A diode in applications requiring fast switching and high efficiency.
MMBD1503A switching diode circuit
This circuit is a simple voltage-limiting or clamping setup using an op-amp and two diodes (D1A and D1B). Basically, what it does is protect sensitive components or measurement devices from voltage spikes.The input voltage (Vin)comes into the circuit through a resistor R1R_1. This resistor helps limit the current and protects the rest of the circuit.There are two diodes connected at this input point. One diode (D1A) points upward toward a +3V supply, while the other diode (D1B) points downward to a -3V supply.When the input voltage is within ±3 volts, these diodes don’t really do much—think of them as being “off,” letting your input signal pass normally to the op-amp.But if the input voltage tries to go above +3V or below -3V, one of these diodes quickly “turns on.” It’s like a safety valve that redirects excess voltage, preventing it from reaching the op-amp input and damaging it.
MMBD1503A vs 1N4148 SMD
Parameter | MMBD1503A | 1N4148 SMD |
Package Type | SOT-23 | SOD-123, SOD-323, or SOT-23 |
Diode Type | High-speed switching diode | General-purpose switching diode |
Max Reverse Voltage | 200 V | 100 V |
Max Forward Current | 200 mA | 150 mA |
Forward Voltage Drop | Typically ~1.25 V @ 150 mA | Typically ~1.0 V @ 10 mA |
Reverse Recovery Time | Typically ~50 ns | Typically ~4 ns |
Typical Applications | High-speed switching, rectification, small-signal detection | General switching, signal detection, logic circuits |
Summary:
-
MMBD1503A offers higher reverse voltage (200V), making it suitable for applications that require higher voltage protection and moderately fast switching speeds.
-
1N4148 SMD has an extremely fast switching speed (~4 ns reverse recovery time), suitable for circuits that require faster switching and signal processing, but it has a lower voltage rating (100V).