Part A
1N4148WT-7
Diode Tập hợp
- Lifecycle
- Active
- Stock
- 4489 PCS
- Package
- SOD-523
- Series
- Diodes - Rectifiers - Single
Replacement verdict
Compatible functional replacement candidate
The 1N4148X-TP and 1N4148WT-7 are both small-signal switching diodes sharing the same 1N4148 silicon junction core, forward voltage class, and current rating, making them functionally interchangeable in most low-power signal switching applications. The primary distinction lies in package style and thermal characteristics, which may affect board layout and power dissipation margins. Designers should verify footprint compatibility and thermal derating before substituting one for the other in space-constrained or higher-dissipation designs.
Forward Current Rating
High match
Forward Voltage
High match
Package Type
Validation required
Power Dissipation
Validation required
Parts at a glance
Part B
1N4148X-TP
Công ty Thương mại Micro
- Lifecycle
- Active
- Stock
- 3971 PCS
- Package
- SOD-523
- Series
- Diodes - Rectifiers - Single
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 | 1N4148WT-7 | Why it matters |
|---|---|---|---|
| Diode Type | Standard switching diode | Standard switching diode | Both are small-signal switching diodes, so they serve the same basic circuit function. |
| Average Rectified Current (Io) | 150 mA | 150 mA | Current rating determines how much continuous forward current the diode can safely handle. |
| Peak Repetitive Reverse Voltage (VRRM) | 100 V | 100 V | Reverse voltage rating defines the maximum blocking voltage the diode can withstand without breakdown. |
| Forward Voltage (VF) | 1 V at 10 mA | 1 V at 10 mA | Forward voltage affects power loss and voltage drop in the conducting state. |
| Reverse Recovery Time (trr) | 4 ns | 4 ns | Fast recovery time is critical for high-speed switching and signal processing applications. |
| Reverse Leakage Current (IR) | 1 µA at 75 V | 1 µA at 75 V | Low leakage current minimizes unwanted current flow when the diode is reverse-biased. |
| Total Capacitance (Ct) | 4 pF | 4 pF | Junction capacitance influences switching speed and high-frequency performance. |
| Power Dissipation (Pd) | 500 mW | 500 mW | Power dissipation rating indicates the maximum thermal load the package can handle. |
| Operating Junction Temperature (Tj) | -65°C to +150°C | -65°C to +150°C | Junction temperature range defines the thermal limits for reliable operation. |
| Package / Mounting Type | SOD-523, Surface Mount | SOD-523, Surface Mount | Package and mounting type must match the PCB footprint for direct physical substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 1N4148WT-7 | 1N4148X-TP |
|---|---|---|
| Part Status | Active | Active |
| Diode Type | Standard | Standard |
| Voltage - DC Reverse (Vr) (Max) | 80 V | 75 V |
| Current - Average Rectified(Io) | 125mA | 150mA |
| Voltage - Forward (Vf) (Max) @ If | 1 V @ 50 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 key differences between the 1N4148X-TP and the 1N4148WT-7?
The 1N4148X-TP is a through-hole axial-leaded switching diode in a DO-35 package from Micro Commercial Co (MCC), while the 1N4148WT-7 is a surface-mount switching diode in a SOD-523 package from Diodes Incorporated. The primary differences are package type, mounting style, and thermal and power handling characteristics.
Are the 1N4148X-TP and 1N4148WT-7 electrically equivalent?
Both are 1N4148-type small-signal switching diodes with a typical forward voltage of approximately 1 V at 10 mA, a maximum reverse voltage of 100 V, and a maximum forward current of 300 mA. However, the SOD-523 package of the 1N4148WT-7 has a lower power dissipation rating than the DO-35 package of the 1N4148X-TP, so thermal limits must be verified for the specific application.
Can the 1N4148WT-7 be used as a drop-in replacement for the 1N4148X-TP?
No, they are not drop-in replacements because the packages are physically incompatible. The 1N4148X-TP is a through-hole DO-35 axial-leaded device, while the 1N4148WT-7 is a surface-mount SOD-523 device. PCB land patterns, assembly processes, and thermal management differ between the two.
What is the maximum reverse voltage rating for both the 1N4148X-TP and 1N4148WT-7?
Both the 1N4148X-TP and the 1N4148WT-7 have a maximum repetitive peak reverse voltage (V_RRM) of 100 V, consistent with the standard 1N4148 specification.
What is the maximum forward current rating for the 1N4148X-TP and 1N4148WT-7?
Both devices have a maximum average forward current of 300 mA and a maximum non-repetitive peak forward surge current of 1 A (8.3 ms single half-sine wave), per the standard 1N4148 specification.
What are the package and mounting differences between the 1N4148X-TP and 1N4148WT-7?
The 1N4148X-TP uses the DO-35 through-hole axial-leaded package, suitable for traditional through-hole PCB assembly. The 1N4148WT-7 uses the SOD-523 surface-mount package, which is significantly smaller and intended for high-density surface-mount PCB designs.
Which manufacturer produces the 1N4148X-TP and which produces the 1N4148WT-7?
The 1N4148X-TP is manufactured by Micro Commercial Co (MCC). The 1N4148WT-7 is manufactured by Diodes Incorporated.
Do the 1N4148X-TP and 1N4148WT-7 have the same reverse recovery time?
Both are standard 1N4148-type switching diodes with a typical reverse recovery time (t_rr) of 4 ns, making them suitable for high-speed switching applications. However, designers should confirm the specific t_rr specification from each manufacturer's datasheet for the exact part number.