Part A
1N4148WT-7
アナログ・デバイセズ
- Lifecycle
- Active
- Stock
- 4489 個数
- Package
- SOD-523
- Series
- ダイオード - 整流器 - シングル
Replacement verdict
Compatible functional replacement candidate
The 1N4148WT-7 and 1N4148W-E3-08 are both surface-mount small-signal switching diodes based on the 1N4148 silicon junction, sharing identical forward current, reverse voltage, and power dissipation ratings. They are functionally interchangeable in most low-power signal switching and clamping applications, provided the PCB footprint and thermal layout accommodate the SOD-523 versus SOD-123 package difference. Designers should verify board-level mechanical fit and confirm that the slightly different thermal resistance characteristics remain within the target application's derating margins before committing to a 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
1N4148W-E3-08
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
- 2797 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 | 1N4148WT-7 | 1N4148W-E3-08 | Why it matters |
|---|---|---|---|
| Manufacturer | Diodes Incorporated | Vishay Semiconductors | Different manufacturers may have slightly different process controls, quality systems, and documentation, which can matter for approved vendor lists and second-source qualification. |
| Average Rectified Forward Current (IO) | 150 mA | 150 mA | Sets the maximum continuous current the diode can safely conduct, directly affecting load capability in switching and clamping circuits. |
| Peak Repetitive Reverse Voltage (VRRM) | 100 V | 100 V | Defines the maximum reverse voltage the diode can withstand repeatedly; must exceed the circuit's peak reverse stress for reliable blocking. |
| Forward Voltage (VF) at 10 mA | 1.0 V max | 1.0 V max | Determines conduction loss and voltage drop in the forward direction; lower VF improves efficiency and signal integrity. |
| Reverse Recovery Time (trr) | 4 ns max | 4 ns max | Critical for high-speed switching; shorter trr reduces switching losses and improves performance in fast digital and pulse circuits. |
| Reverse Leakage Current (IR) at 75 V | 1 µA max | 1 µA max | Low leakage preserves signal accuracy and reduces off-state power loss, especially important in high-impedance and precision circuits. |
| Total Capacitance (CT) | 2 pF max | 2 pF max | Affects high-frequency response and signal integrity; lower capacitance enables faster edge rates and less capacitive loading. |
| Package / Mounting | SOD-523, Surface Mount | SOD-123, Surface Mount | Footprint and board space differ; package compatibility is essential for drop-in substitution and PCB layout. |
| Power Dissipation | 150 mW | 350 mW | Higher power dissipation allows the diode to handle more thermal load, influencing reliability and derating requirements. |
| Operating Junction Temperature (TJ) | -65 °C to +150 °C | -65 °C to +150 °C | Defines the thermal operating window; matching ranges ensures equivalent reliability across the target application environment. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 1N4148WT-7 | 1N4148W-E3-08 |
|---|---|---|
| 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 | 1.2 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 | 100 µA @ 100 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 1N4148WT-7 and the 1N4148W-E3-08?
The primary differences are the manufacturer, the package type, and the qualification or ordering information. The 1N4148WT-7 is a Diodes Incorporated fast switching diode in a SOD-523 package, while the 1N4148W-E3-08 is a Vishay Semiconductors fast switching diode in a SOD-123 package. They share the same basic 1N4148 silicon switching diode characteristics but are not mechanically or footprint interchangeable.
Are the 1N4148WT-7 and 1N4148W-E3-08 electrically identical?
They are both 1N4148-type fast switching diodes with similar forward voltage, reverse voltage, and reverse recovery time specifications, but they are not guaranteed to be identical in every parameter. The 1N4148WT-7 is rated for 100 V repetitive peak reverse voltage and 150 mA average forward current, and the 1N4148W-E3-08 is also rated for 100 V repetitive peak reverse voltage and 150 mA average forward current. Always verify the specific datasheet limits for the exact part number before design use.
Can the 1N4148WT-7 and 1N4148W-E3-08 be substituted for each other directly?
No, they cannot be substituted directly without PCB redesign because they use different packages. The 1N4148WT-7 uses the SOD-523 surface-mount package, while the 1N4148W-E3-08 uses the SOD-123 surface-mount package. The pad layouts, body dimensions, and lead configurations differ, so a board designed for one package will not accept the other without modification.
What are the package and mounting differences between the 1N4148WT-7 and 1N4148W-E3-08?
The 1N4148WT-7 is supplied in the SOD-523 package, which is a very small surface-mount package with a typical body length of about 1.2 mm and a width of about 0.8 mm. The 1N4148W-E3-08 is supplied in the SOD-123 package, which is larger, with a typical body length of about 2.7 mm and a width of about 1.6 mm. Both are surface-mount devices, but their land patterns and thermal characteristics differ.
What are the current and voltage ratings of the 1N4148WT-7 and 1N4148W-E3-08?
Both devices are typically rated for 100 V repetitive peak reverse voltage and 150 mA average forward current, consistent with the standard 1N4148 specification. The 1N4148WT-7 datasheet from Diodes Incorporated specifies 100 V repetitive peak reverse voltage and 150 mA average rectified forward current. The 1N4148W-E3-08 datasheet from Vishay Semiconductors specifies 100 V repetitive peak reverse voltage and 150 mA average forward current. Verify these values against the latest manufacturer datasheet for the exact part number.
What is the reverse recovery time of the 1N4148WT-7 and 1N4148W-E3-08?
Both are fast switching diodes with a typical reverse recovery time in the range of 4 ns, which is characteristic of the 1N4148 family. The 1N4148WT-7 datasheet specifies a maximum reverse recovery time of 4 ns under specified test conditions. The 1N4148W-E3-08 datasheet also specifies a maximum reverse recovery time of 4 ns under specified test conditions. Confirm the exact test conditions and limits in the respective manufacturer datasheets.
Which manufacturer produces the 1N4148WT-7 and which produces the 1N4148W-E3-08?
The 1N4148WT-7 is manufactured by Diodes Incorporated. The 1N4148W-E3-08 is manufactured by Vishay Semiconductors. The suffix and ordering codes differ by manufacturer, so always refer to the specific manufacturer datasheet for electrical limits, package drawings, and reliability data.
Are the 1N4148WT-7 and 1N4148W-E3-08 RoHS compliant?
RoHS compliance depends on the specific ordering code and manufacturer declaration. The 1N4148W-E3-08 from Vishay Semiconductors is typically offered as a lead-free, RoHS-compliant version, where the E3 suffix indicates lead-free and RoHS compliance. The 1N4148WT-7 from Diodes Incorporated is also typically supplied as a RoHS-compliant, halogen-free part, but the exact compliance status must be confirmed from the manufacturer's product datasheet or environmental compliance documentation for the specific ordering code.
What are the typical applications for the 1N4148WT-7 and 1N4148W-E3-08?
Both devices are general-purpose fast switching diodes used in signal processing, clamping, protection, and switching circuits. Typical applications include high-speed switching, steering logic, blocking, and small-signal rectification in consumer, industrial, and communication equipment. Because the 1N4148WT-7 is in a smaller SOD-523 package, it is often chosen for space-constrained portable designs, while the 1N4148W-E3-08 in SOD-123 may be preferred where slightly larger pads and easier handling are acceptable.