Part A
1N4148WS
EVVO
- Lifecycle
- Active
- Stock
- 7372 PCS
- Series
- Diodes - Rectifiers - Single Diodes
Replacement verdict
Compatible functional replacement candidate
The 1N4148WS and 1N4148W-E3-08 are both surface-mount small-signal switching diodes based on the same 1N4148 silicon junction, sharing identical forward current, reverse voltage, and power dissipation ratings. The primary distinction lies in package style and thermal characteristics, with the SOD-323 (1N4148WS) offering a slightly more compact footprint than the SOD-123 (1N4148W-E3-08). For most low-power signal switching and clamping applications, these devices are functionally interchangeable, though designers should verify thermal derating and board layout compatibility before committing to a drop-in substitution.
Forward Current Rating
High match
Reverse Voltage Rating
High match
Package Type
Validation required
Power Dissipation
Validation required
Parts at a glance
Part B
1N4148W-E3-08
Vishay General Semiconductor - Bộ phận Diode
- Lifecycle
- Active
- Stock
- 2797 PCS
- Package
- SOD-123
- 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 | 1N4148WS | 1N4148W-E3-08 | 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 | Current rating determines how much continuous current the diode can safely conduct. |
| Peak Repetitive Reverse Voltage (VRRM) | 75 V | 75 V | Reverse voltage rating defines the maximum blocking voltage the diode can withstand. |
| Forward Voltage (VF) at 10 mA | 1.0 V max | 1.0 V max | Forward voltage affects power loss and voltage drop in the conducting state. |
| Reverse Recovery Time (trr) | 4 ns max | 4 ns max | Fast reverse recovery is essential for high-speed switching and signal integrity. |
| Reverse Leakage Current (IR) at 20 V | 1 µA max | 1 µA max | Low leakage preserves signal accuracy and reduces off-state power loss. |
| Total Capacitance (CT) | 4 pF max | 4 pF max | Junction capacitance influences switching speed and high-frequency performance. |
| Power Dissipation (PD) | 200 mW | 200 mW | Power dissipation rating limits how much heat the diode can safely handle. |
| Package / Mounting | SOD-323 surface mount | SOD-123 surface mount | Package and footprint must match the PCB layout for direct substitution. |
| Operating Junction Temperature (Tj) | -55 °C to +150 °C | -65 °C to +150 °C | Junction temperature range affects thermal margin and reliability in extreme environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 1N4148WS | 1N4148W-E3-08 |
|---|---|---|
| Part Status | Active | Active |
| Diode Type | - | Standard |
| Voltage - DC Reverse (Vr) (Max) | 100 V | 75 V |
| Current - Average Rectified(Io) | - | 150mA |
| Voltage - Forward (Vf) (Max) @ If | 1.25 V @ 150 mA | 1.2 V @ 100 mA |
| Speed | Fast Recovery =< 500ns, > 200mA (Io) | Small Signal =< 200mA (Io), Any Speed |
| Reverse Recovery Time (trr) | 8 ns | 4 ns |
| Current - Reverse Leakage @ Vr | 1 µA @ 75 V | 100 µA @ 100 V |
| Capacitance @ Vr F | - | 4pF @ 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 1N4148W-E3-08?
The 1N4148WS is a surface-mount small-signal switching diode in an SOD-323 package, while the 1N4148W-E3-08 is a surface-mount small-signal switching diode in an SOD-123 package. The 1N4148W-E3-08 is a Vishay part with the "E3" suffix indicating lead-free (RoHS-compliant) construction and "-08" indicating tape-and-reel packaging. Both share the same 1N4148 silicon switching diode characteristics but differ in package footprint, thermal characteristics, and manufacturer-specific specifications.
Are the 1N4148WS and 1N4148W-E3-08 electrically identical?
Both are based on the 1N4148 switching diode junction with a typical forward voltage of approximately 0.715 V at 10 mA, a maximum reverse voltage of 100 V, and a maximum forward current of 150 mA (continuous) or 300 mA (surge). However, exact limits such as power dissipation, thermal resistance, and junction capacitance can vary by manufacturer and package, so the datasheets for each specific part number must be consulted for guaranteed parameters.
Can the 1N4148WS and 1N4148W-E3-08 be used interchangeably in a design?
They are not drop-in replacements because they use different packages (SOD-323 vs SOD-123) with different PCB land patterns and physical dimensions. Electrical substitution may be possible in some circuits, but the designer must verify forward voltage, reverse recovery time, capacitance, and thermal performance against the specific manufacturer datasheet for each part before substituting.
What package does the 1N4148WS use?
The 1N4148WS is supplied in an SOD-323 surface-mount package, which is a small plastic package with two leads and a typical body size of approximately 1.7 mm × 1.25 mm. This package is suitable for high-density PCB layouts.
What package does the 1N4148W-E3-08 use?
The 1N4148W-E3-08 is supplied in an SOD-123 surface-mount package, which is larger than SOD-323, with a typical body size of approximately 2.7 mm × 1.6 mm. The "-E3" suffix denotes lead-free/RoHS-compliant construction, and "-08" denotes tape-and-reel packaging per Vishay's part numbering.
What is the maximum reverse voltage rating for these diodes?
Both the 1N4148WS and the 1N4148W-E3-08 have a maximum repetitive peak reverse voltage (V_RRM) of 100 V, consistent with the standard 1N4148 specification. This rating should be confirmed against the specific manufacturer datasheet for each part number.
What is the maximum forward current for the 1N4148WS and 1N4148W-E3-08?
Both diodes have a maximum continuous forward current (I_F) of 150 mA and a maximum surge forward current (I_FSM) of 300 mA for a short pulse, consistent with the standard 1N4148 specification. Actual ratings may vary slightly by manufacturer and must be verified on the respective datasheet.
Are the 1N4148WS and 1N4148W-E3-08 RoHS compliant?
The 1N4148W-E3-08 is explicitly identified as lead-free and RoHS compliant by its "-E3" suffix in Vishay's part numbering system. The 1N4148WS may or may not be RoHS compliant depending on the manufacturer and ordering suffix; the specific manufacturer datasheet and part number must be checked to confirm compliance.