Part A
1N4148W-TP
Micro Commercial Co.
- Lifecycle
- Active
- Stock
- 4867 Stückzahl
- Package
- SOD-123
- Series
- Dioden-Gleichrichter
Replacement verdict
Compatible functional replacement candidate
The 1N4148X-TP and 1N4148W-TP are both small-signal switching diodes sharing the same 1N4148 electrical core, making them functionally interchangeable in most low-power signal and switching applications. The primary distinction lies in package style and thermal handling, so designers should confirm board footprint, thermal derating, and assembly process compatibility before substituting one for the other.
Forward Current Rating
High match
Reverse Voltage Rating
High match
Package Type
Validation required
Power Dissipation
Validation required
Parts at a glance
Part B
1N4148X-TP
Micro Commercial Co.
- Lifecycle
- Active
- Stock
- 3971 Stückzahl
- Package
- SOD-523
- Series
- Dioden-Gleichrichter
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 1N4148X-TP | 1N4148W-TP | Why it matters |
|---|---|---|---|
| Package / Case | SOD-523 | SOD-123 | Footprint and board space differ; the two parts are not drop-in replacements for each other on a PCB. |
| Average Rectified Forward Current (IO) | 150 mA | 300 mA | Higher current rating allows the SOD-123 part to handle more load current in a given circuit. |
| Power Dissipation | 150 mW | 400 mW | Power dissipation capability affects thermal margin and maximum allowable continuous operation. |
| Forward Voltage (VF) at 10 mA | 1.0 V max | 1.0 V max | Forward voltage drop influences signal clamping levels and power loss in the diode. |
| Reverse Recovery Time (trr) | 4 ns max | 4 ns max | Fast recovery is essential for high-speed switching and signal demodulation applications. |
| Reverse Voltage (VR) | 75 V | 75 V | Maximum reverse voltage determines the highest blocking voltage the diode can withstand. |
| Junction Capacitance (CT) | 4 pF max | 2 pF max | Lower junction capacitance improves high-frequency performance and reduces signal loading. |
| Operating Junction Temperature (TJ) | -55 to +150 °C | -55 to +150 °C | Thermal range defines the environment in which the diode can reliably operate. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 1N4148W-TP | 1N4148X-TP |
|---|---|---|
| Part Status | Active | Active |
| Diode Type | Standard | Standard |
| Voltage - DC Reverse (Vr) (Max) | 100 V | 75 V |
| Current - Average Rectified(Io) | 150mA | 150mA |
| Voltage - Forward (Vf) (Max) @ If | 1.25 V @ 150 mA | 1.25 V @ 150 mA |
| Speed | Small Signal =< 200mA (Io), Any Speed | Small Signal =< 200mA (Io), Any Speed |
| Reverse Recovery Time (trr) | 4 ns | 4 ns |
| Current - Reverse Leakage @ Vr | 1 µA @ 75 V | 1 µA @ 75 V |
| Capacitance @ Vr F | 2pF @ 0V, 1MHz | 2pF @ 0V, 1MHz |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the 1N4148X-TP and 1N4148W-TP?
The primary difference is the package type. The 1N4148X-TP is supplied in the SOD-523 (SC-79) surface-mount package, while the 1N4148W-TP is supplied in the SOD-123 surface-mount package. Both are small-signal fast switching diodes with similar electrical ratings, but their footprint, thermal characteristics, and mechanical dimensions differ.
Are the 1N4148X-TP and 1N4148W-TP electrically identical?
Both devices share the same fundamental 1N4148 diode characteristics, including a repetitive peak reverse voltage (Vrrm) of 100 V, a forward current (If) rating of 150 mA, and a forward voltage (Vf) of approximately 1 V at 10 mA. However, because the packages differ, thermal resistance and power dissipation capabilities may vary slightly between the two. Designers should verify the specific datasheet parameters for each package variant.
Can the 1N4148X-TP be used as a drop-in replacement for the 1N4148W-TP?
No, they are not drop-in replacements because they use different PCB land patterns. The 1N4148X-TP in SOD-523 is significantly smaller than the 1N4148W-TP in SOD-123. A board designed for SOD-123 cannot directly accept a SOD-523 package without a footprint adapter or PCB redesign, and vice versa.
What is the package type of the 1N4148X-TP?
The 1N4148X-TP is housed in the SOD-523 (also known as SC-79) surface-mount package. This is an ultra-small package suitable for high-density PCB layouts.
What is the package type of the 1N4148W-TP?
The 1N4148W-TP is housed in the SOD-123 surface-mount package. This package is larger than SOD-523 and offers slightly better power dissipation and easier handling for some assembly processes.
Do both diodes have the same reverse recovery time?
Yes, both the 1N4148X-TP and 1N4148W-TP are fast switching diodes with a typical reverse recovery time (trr) of 4 ns, making them suitable for high-speed switching applications.
Which part number is better for space-constrained designs?
The 1N4148X-TP in the SOD-523 package is better for space-constrained designs because it occupies a smaller PCB area than the 1N4148W-TP in the SOD-123 package.
Are both the 1N4148X-TP and 1N4148W-TP RoHS compliant?
Yes, both the 1N4148X-TP and 1N4148W-TP are RoHS compliant and halogen-free, as stated in their respective manufacturer datasheets and distributor product pages.