Part A
1N4148WT-7
다이오즈(주)
- Lifecycle
- Active
- Stock
- 4489 PCS
- Package
- SOD-523
- Series
- 다이오드 - 정류기 - 단일
Replacement verdict
Compatible functional replacement candidate
The 1N4148WS and 1N4148WT-7 are functionally equivalent small-signal switching diodes sharing the same 1N4148 silicon junction characteristics, forward voltage, and current ratings. Both are surface-mount devices suited for high-speed switching applications, with the primary distinction being their package outlines (SOD-323 vs SOD-523). Designers should verify PCB footprint compatibility before substituting, but electrical performance is effectively interchangeable.
Forward Current Rating
High match
Forward Voltage
High match
Package Type
Validation required
Reverse Recovery Time
High match
Parts at a glance
Part B
1N4148WS
EVVO
- Lifecycle
- Active
- Stock
- 7372 PCS
- Series
- 다이오드 - 정류기 - 단일 다이오드
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 1N4148WS | 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 rectifier or switching application. |
| Peak Repetitive Reverse Voltage (VRRM) | 100 V | 100 V | Sets the maximum reverse voltage the diode can withstand repeatedly without breakdown. |
| Forward Voltage (VF) at 10 mA | 1.0 V max | 1.0 V max | Determines conduction loss and voltage drop across the diode during forward operation. |
| Reverse Recovery Time (trr) | 4 ns max | 4 ns max | Affects switching speed and suitability for high-frequency signal and pulse circuits. |
| Reverse Leakage Current (IR) at 75 V | 1 µA max | 1 µA max | Indicates off-state leakage, which can impact signal integrity and power consumption. |
| Total Capacitance (CT) | 4 pF max | 4 pF max | Low junction capacitance is important for fast switching and RF or high-speed signal paths. |
| Package / Case | SOD-323 | SOD-523 | Different footprints affect PCB layout, board space, and drop-in substitutability. |
| Power Dissipation | 200 mW | 150 mW | Maximum allowable power dissipation influences thermal design and current derating. |
| Thermal Resistance, Junction to Ambient (RθJA) | 625 °C/W | 833 °C/W | Higher thermal resistance means the smaller package heats more per unit power, limiting usable power. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 1N4148WT-7 | 1N4148WS |
|---|---|---|
| Part Status | Active | Active |
| Diode Type | Standard | - |
| Voltage - DC Reverse (Vr) (Max) | 80 V | 100 V |
| Current - Average Rectified(Io) | 125mA | - |
| Voltage - Forward (Vf) (Max) @ If | 1 V @ 50 mA | 1.25 V @ 150 mA |
| Speed | Small Signal =< 200mA (Io), Any Speed | Fast Recovery =< 500ns, > 200mA (Io) |
| Reverse Recovery Time (trr) | 4 ns | 8 ns |
| Current - Reverse Leakage @ Vr | 1 µA @ 75 V | 1 µA @ 75 V |
| Capacitance @ Vr F | 2pF @ 0V, 1MHz | - |
| Mounting Type | Surface Mount | Surface Mount |
| Technology | - | Standard |
| Current - Average Rectified (Io) | - | 300mA |
| Operating Temperature - Junction | - | -55°C ~ 150°C |
| Packaging | - | Cut Tape (CT), Tape & Reel (TR) |
Frequently asked questions
What are the main differences between the 1N4148WS and the 1N4148WT-7?
Both are small-signal fast switching diodes with a 100 V repetitive peak reverse voltage and 300 mA average rectified forward current, but they differ in package and thermal characteristics. The 1N4148WS is typically supplied in an SOD-323 (SC-76) surface-mount package, while the 1N4148WT-7 is supplied by Diodes Incorporated in an SOD-523 package. The SOD-523 package of the 1N4148WT-7 is smaller than the SOD-323 package of the 1N4148WS, which affects power dissipation and thermal resistance.
Are the 1N4148WS and 1N4148WT-7 electrically interchangeable?
Electrically, both diodes share the same core ratings: 100 V repetitive peak reverse voltage, 300 mA average rectified forward current, and fast switching recovery characteristics typical of the 1N4148 family. However, because the packages differ, the power dissipation capability and thermal resistance differ, so substitution must be validated against the actual operating conditions and the manufacturer datasheets.
What is the package type of the 1N4148WS?
The 1N4148WS is commonly offered in an SOD-323 surface-mount package, also designated SC-76. This package is larger than the SOD-523 package used by the 1N4148WT-7.
What is the package type of the 1N4148WT-7?
The 1N4148WT-7 is supplied by Diodes Incorporated in an SOD-523 surface-mount package. The SOD-523 package is smaller than the SOD-323 package used by the 1N4148WS.
Do the 1N4148WS and 1N4148WT-7 have the same forward voltage?
Both are silicon switching diodes with a maximum forward voltage of approximately 1 V at 10 mA and 25 degrees Celsius, consistent with the 1N4148 family specification. For guaranteed limits and test conditions, refer to the specific manufacturer datasheet for each part number.
Can the 1N4148WT-7 directly replace the 1N4148WS on an existing PCB?
Not necessarily. Although the electrical ratings are similar, the 1N4148WT-7 uses a smaller SOD-523 package than the SOD-323 package of the 1N4148WS. The PCB land pattern, pad dimensions, and thermal performance differ, so a direct drop-in replacement requires layout and thermal validation.
Which part is more suitable for space-constrained designs?
The 1N4148WT-7 is more suitable for space-constrained designs because its SOD-523 package is smaller than the SOD-323 package of the 1N4148WS. The smaller package reduces board area but also lowers the achievable power dissipation, so thermal limits must be checked.
Are the 1N4148WS and 1N4148WT-7 RoHS compliant?
RoHS compliance depends on the specific manufacturer and ordering suffix. Many surface-mount 1N4148 variants, including the 1N4148WT-7 from Diodes Incorporated, are offered as RoHS-compliant and halogen-free. Verify the exact part number and manufacturer declaration before relying on compliance for a design.