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 1N4148W and 1N4148WT-7 are functionally equivalent small-signal switching diodes sharing the same 100 V repetitive peak reverse voltage, 300 mA average rectified forward current, and SOD-123 surface-mount package. Both offer comparable forward voltage, reverse recovery, and capacitance characteristics, making them suitable drop-in substitutes in most switching and clamping applications. Designers should verify thermal derating and moisture sensitivity level requirements against the specific assembly process before final qualification.
Reverse Voltage Rating
High match
Forward Current Rating
High match
Package Type
High match
Thermal and Moisture Sensitivity
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 1N4148W | 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 Forward Current (IO) | 150 mA | 150 mA | Defines the maximum continuous current the diode can safely conduct in a design. |
| Peak Repetitive Reverse Voltage (VRRM) | 100 V | 100 V | Sets the maximum reverse voltage the diode can block without breakdown. |
| Forward Voltage (VF) at 10 mA | 1.0 V max | 1.0 V max | Affects power loss and voltage drop in the conducting state. |
| Reverse Recovery Time (trr) | 4 ns max | 4 ns max | Determines how quickly the diode can switch from conducting to blocking, critical for high-speed switching. |
| Reverse Leakage Current (IR) at 75 V | 1 µA max | 1 µA max | Low leakage preserves signal integrity and reduces standby power in off-state conditions. |
| Total Capacitance (CT) | 4 pF max | 4 pF max | Junction capacitance influences switching speed and RF/high-frequency performance. |
| Power Dissipation (PD) | 400 mW | 400 mW | Indicates the maximum thermal power the package can dissipate without damage. |
| Package / Mounting | SOD-123 surface mount | SOD-523 surface mount | Different package footprints affect PCB layout, board space, and thermal performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 1N4148WT-7 | 1N4148W |
|---|---|---|
| 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 @ 100 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 | 4pF @ 0V, 1MHz |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the 1N4148W and the 1N4148WT-7?
Both are surface-mount fast switching diodes with a 100 V repetitive peak reverse voltage and 300 mA average rectified forward current. The 1N4148W is typically offered in a SOD-123 package, while the 1N4148WT-7 is supplied by Diodes Incorporated in a SOD-523 package, which is smaller. The 1N4148WT-7 is also provided on 7-inch tape and reel.
Are the 1N4148W and 1N4148WT-7 electrically interchangeable?
They share the same basic 1N4148 silicon switching diode characteristics, including 100 V repetitive peak reverse voltage, 300 mA average rectified forward current, and fast switching speed. However, because package thermal resistance and power dissipation differ, the designer must verify thermal margins and any derating requirements before substituting one for the other.
What package does the 1N4148W use?
The 1N4148W is commonly supplied in a SOD-123 surface-mount package. Package dimensions and land pattern should be confirmed against the specific manufacturer datasheet, as multiple suppliers offer 1N4148W-type devices.
What package does the 1N4148WT-7 use?
The 1N4148WT-7 from Diodes Incorporated is supplied in a SOD-523 package. This package is smaller than SOD-123, so PCB land patterns are not compatible between the two part numbers.
Can the 1N4148WT-7 directly replace the 1N4148W on an existing PCB?
No, not without a PCB layout change. The SOD-523 package of the 1N4148WT-7 has different pad dimensions and spacing than the SOD-123 package of the 1N4148W, so the land patterns are not interchangeable.
What is the repetitive peak reverse voltage rating for both parts?
Both the 1N4148W and the 1N4148WT-7 are rated for a repetitive peak reverse voltage (VRRM) of 100 V, consistent with the standard 1N4148 specification.
What is the average rectified forward current rating for both parts?
Both the 1N4148W and the 1N4148WT-7 have an average rectified forward current (IO) rating of 300 mA, in line with the standard 1N4148 diode family.
How does the thermal performance compare between the 1N4148W and the 1N4148WT-7?
The smaller SOD-523 package of the 1N4148WT-7 typically has higher thermal resistance and lower power dissipation capability than the SOD-123 package of the 1N4148W. Actual thermal limits must be verified from the specific manufacturer datasheet for the intended operating conditions.