Part A
1N4148WS
EVVO
- Lifecycle
- Active
- Stock
- 7372 個数
- Series
- ダイオード - 整流器 - シングルダイオード
Replacement verdict
Compatible functional replacement candidate
The 1N4148WS and 1N4148W-E3-18 are functionally equivalent small-signal switching diodes sharing the same 100 V repetitive peak reverse voltage, 150 mA average forward current, and SOD-323 surface-mount package. Both are suitable for high-speed switching applications, with the primary distinction being manufacturer sourcing and RoHS compliance documentation rather than electrical performance.
Forward Current Rating
High match
Reverse Voltage Rating
High match
Package Type
High match
Reverse Recovery Time
Validation required
Parts at a glance
Part B
1N4148W-E3-18
ビシェイ・ゼネラル・セミコンダクター - ダイオード部門
- Lifecycle
- Active
- Stock
- 2407 個数
- Package
- SOD-123
- Series
- ダイオード - 整流器 - シングル
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-E3-18 | Why it matters |
|---|---|---|---|
| Manufacturer | Vishay / onsemi / Diodes Inc (multiple sources) | Vishay Semiconductors | Different manufacturers may have slightly different process controls, but both are industry-standard switching diodes. |
| Package / Case | SOD-323 (SC-76) | SOD-123 | Footprint and board space differ; SOD-323 is smaller than SOD-123, so they are not drop-in replacements without layout changes. |
| Average Rectified Forward Current (IO) | 150 mA | 150 mA | Both handle the same continuous current, so current-carrying capability is equivalent. |
| Peak Repetitive Reverse Voltage (VRRM) | 75 V | 75 V | Identical reverse voltage rating means both suit the same voltage-blocking applications. |
| Forward Voltage (VF) at 10 mA | 1.0 V max | 1.0 V max | Same forward drop ensures comparable conduction losses and signal clamping behavior. |
| Reverse Recovery Time (trr) | 4 ns max | 4 ns max | Fast recovery is critical for high-speed switching; identical trr means equivalent switching speed. |
| Reverse Leakage Current (IR) at 20 V | 1 µA max | 1 µA max | Low leakage preserves signal integrity in high-impedance circuits; both meet the same limit. |
| Total Capacitance (CT) | 4 pF max | 4 pF max | Junction capacitance affects high-frequency performance; identical values mean similar RF behavior. |
| Power Dissipation | 200 mW | 200 mW | Same power rating indicates equivalent thermal handling capability in the application. |
| Operating Junction Temperature (Tj) | -55 °C to +150 °C | -55 °C to +150 °C | Identical temperature range ensures both work in the same thermal environments. |
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 | 1N4148WS | 1N4148W-E3-18 |
|---|---|---|
| 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-E3-18?
The 1N4148WS is a surface-mount small-signal switching diode in an SOD-323 package, while the 1N4148W-E3-18 is a surface-mount small-signal switching diode in an SOD-123 package. The 1N4148W-E3-18 is a Vishay part with the "E3" suffix indicating lead-free (RoHS-compliant) construction and "18" 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-E3-18 electrically identical?
Both are based on the 1N4148 switching diode junction and share the same fundamental ratings: 100 V repetitive peak reverse voltage, 75 V continuous reverse voltage, 300 mA average forward current, and 1 V maximum forward voltage at 10 mA. However, exact electrical limits such as junction capacitance, reverse recovery time, and thermal resistance can vary slightly between manufacturers and package types, so the specific datasheets must be consulted for guaranteed parameters.
Can the 1N4148WS and 1N4148W-E3-18 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 many low-frequency switching applications, but the designer must verify package footprint compatibility, thermal performance, and the specific manufacturer's datasheet limits before substituting one for the other.
What package does the 1N4148WS use and what are its typical dimensions?
The 1N4148WS is supplied in an SOD-323 (also known as SC-76) surface-mount package. Typical SOD-323 dimensions are approximately 1.7 mm × 1.25 mm body with a height of about 1.0 mm, with two gull-wing leads. Designers should confirm exact dimensions from the specific manufacturer's datasheet because minor variations exist between suppliers.
What package does the 1N4148W-E3-18 use and what are its typical dimensions?
The 1N4148W-E3-18 is supplied by Vishay in an SOD-123 surface-mount package. Typical SOD-123 dimensions are approximately 2.85 mm × 1.8 mm body with a height of about 1.35 mm, with two gull-wing leads. The larger package provides somewhat better power dissipation capability than the SOD-323 used by the 1N4148WS.
What does the "E3" suffix mean on the 1N4148W-E3-18?
The "E3" suffix in Vishay's part numbering indicates that the device is lead-free and RoHS-compliant, with tin-plated terminations. The "18" suffix indicates the tape-and-reel packaging option (typically 10,000 pieces per 13-inch reel). This is a manufacturer-specific designation and does not change the electrical characteristics of the diode.
What are the maximum forward current and reverse voltage ratings for these diodes?
Both the 1N4148WS and 1N4148W-E3-18 are rated for a maximum average forward current of 300 mA and a repetitive peak reverse voltage of 100 V, with a continuous reverse voltage rating of 75 V. These are the standard 1N4148 family ratings. Always verify these values against the specific manufacturer's datasheet, as some suppliers may specify slightly different limits.
Which part is better for high-density PCB layouts?
The 1N4148WS in the SOD-323 package is smaller and better suited for high-density PCB layouts where board space is critical. The 1N4148W-E3-18 in the SOD-123 package occupies more board area but offers slightly better thermal performance and power dissipation. The choice depends on the trade-off between miniaturization and thermal margin in the target application.