Part A
1N4148W-E3-18
Vishay General Semiconductor - 二極體部門
- Lifecycle
- Active
- Stock
- 2407 件
- Package
- SOD-123
- Series
- 二極體-整流器-單
Replacement verdict
Compatible functional replacement candidate
The 1N4148X-TP and 1N4148W-E3-18 are both small-signal switching diodes sharing the same 1N4148 silicon junction core, forward current rating, and reverse voltage rating, making them functionally interchangeable in most low-power signal switching and clamping applications. The primary engineering consideration is package and mounting style: the 1N4148X-TP is a through-hole axial-leaded device, while the 1N4148W-E3-18 is a surface-mount SOD-123 package, so board-level interchangeability requires layout adaptation rather than direct drop-in substitution.
Forward Current Rating
High match
Reverse Voltage Rating
High match
Package Type
Validation required
Forward Voltage Drop
High match
Parts at a glance
Part B
1N4148X-TP
微型商業公司
- Lifecycle
- Active
- Stock
- 3971 件
- Package
- SOD-523
- Series
- 二極體-整流器-單
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 | 1N4148W-E3-18 | Why it matters |
|---|---|---|---|
| Manufacturer | Micro Commercial Co | Vishay General Semiconductor | Different manufacturers may have different quality, availability, and pricing, but both are reputable sources for this standard part. |
| Package / Case | SOD-523 | SOD-123 | Package footprint determines PCB layout compatibility; SOD-523 is smaller than SOD-123, so they are not drop-in replacements without layout changes. |
| Average Rectified Current (Io) | 150 mA | 150 mA | Maximum continuous forward current the diode can handle; identical rating means similar current-carrying capability. |
| Forward Voltage (Vf) at 10 mA | 1 V max | 1 V max | Determines power loss and voltage drop in the circuit; identical values ensure similar efficiency. |
| Reverse Voltage (Vr) Max | 75 V | 75 V | Maximum reverse voltage the diode can withstand; identical rating ensures same blocking capability. |
| Reverse Recovery Time (trr) | 4 ns | 4 ns | Speed at which the diode switches from conducting to blocking; identical fast recovery makes both suitable for high-speed switching. |
| Forward Surge Current (Ifsm) | 2 A | 2 A | Peak current the diode can handle for short pulses; identical rating ensures similar surge tolerance. |
| Operating Junction Temperature (Tj) | -65°C to 150°C | -65°C to 150°C | Temperature range over which the diode operates reliably; identical range ensures similar thermal performance. |
| Power Dissipation (Pd) | 250 mW | 350 mW | Maximum power the diode can dissipate; higher rating in the 1N4148W-E3-18 allows slightly more thermal margin. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, suitable for modern PCB assembly, but package size differs. |
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 | 1N4148W-E3-18 | 1N4148X-TP |
|---|---|---|
| Part Status | Active | Active |
| Diode Type | Standard | Standard |
| Voltage - DC Reverse (Vr) (Max) | 75 V | 75 V |
| Current - Average Rectified(Io) | 150mA | 150mA |
| Voltage - Forward (Vf) (Max) @ If | 1.2 V @ 100 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 | 100 µA @ 100 V | 1 µA @ 75 V |
| Capacitance @ Vr F | 4pF @ 0V, 1MHz | 2pF @ 0V, 1MHz |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the 1N4148X-TP and the 1N4148W-E3-18?
The 1N4148X-TP is a Micro Commercial Co (MCC) small-signal switching diode supplied in a SOD-523 package, while the 1N4148W-E3-18 is a Vishay small-signal switching diode supplied in a SOD-123 package. Both share the same 1N4148 silicon switching-diode junction and are intended for high-speed switching, but they differ in package, manufacturer, and thermal/mechanical characteristics.
Are the 1N4148X-TP and 1N4148W-E3-18 electrically equivalent?
Both are 1N4148-type silicon switching diodes with a repetitive peak reverse voltage (V_RRM) of 100 V, a forward current rating of 150 mA to 300 mA depending on the datasheet conditions, and a forward voltage of approximately 1 V at 10 mA. However, designers must verify the exact ratings from each manufacturer's datasheet because continuous forward current, power dissipation, and thermal resistance can differ between the SOD-523 and SOD-123 packages.
Can the 1N4148X-TP and 1N4148W-E3-18 be used as direct substitutes for each other?
They are not drop-in replacements because they use different packages (SOD-523 vs SOD-123) with different PCB land patterns and footprints. Electrical substitution may be possible in some circuits, but the board layout, thermal performance, and parasitic characteristics must be revalidated against the target design requirements.
What is the package difference between the 1N4148X-TP and the 1N4148W-E3-18?
The 1N4148X-TP is housed in a SOD-523 package, which is a very small surface-mount package. The 1N4148W-E3-18 is housed in a SOD-123 package, which is larger than SOD-523. This affects board space, thermal dissipation, and solder joint geometry.
What are the typical applications for the 1N4148X-TP and 1N4148W-E3-18?
Both diodes are used for high-speed switching, signal clamping, steering, and general-purpose small-signal rectification in consumer, industrial, and communication electronics. The 1N4148X-TP is often chosen where minimal board space is critical, while the 1N4148W-E3-18 is used where the slightly larger SOD-123 package and its thermal behavior are acceptable or preferred.
Do the 1N4148X-TP and 1N4148W-E3-18 have the same reverse recovery time?
Both are 1N4148-type switching diodes and are specified for fast switching, with reverse recovery time (t_rr) typically in the nanosecond range. However, the exact t_rr value should be taken from the respective manufacturer datasheet, as test conditions and specified maximums can vary between MCC and Vishay.
Which part has better thermal performance, the 1N4148X-TP or the 1N4148W-E3-18?
The 1N4148W-E3-18 in the SOD-123 package generally offers better power dissipation and lower thermal resistance than the 1N4148X-TP in the smaller SOD-523 package, because the larger package provides more surface area for heat removal. Exact thermal resistance values must be confirmed from the respective datasheets.
Are the 1N4148X-TP and 1N4148W-E3-18 RoHS compliant?
RoHS compliance depends on the specific manufacturer part number and its suffix. The 1N4148W-E3-18 from Vishay is typically supplied as a lead-free, RoHS-compliant version, and the 1N4148X-TP from MCC is also generally offered as a RoHS-compliant product. Designers should confirm compliance status on the official manufacturer or distributor documentation for the exact ordering code.