Specifications
| Type | Description |
|---|---|
| Part Number | 1N4148 |
| Manufacturer | Vishay |
| Product Type | Switching Diode |
| Category | Power Devices |
| Package / Case | DO-35 (DO-204AH), 25.4 mm (1.000 in) min lead length each side, body length 3.4 mm (0.134 in) max, body diameter approx. 1.5-1.75 mm (0.059-0.069 in), lead diameter 0.55 mm (0.022 in) max |
| Diode Material / Construction | Silicon epitaxial planar diode |
| Electrically Equivalent Diode | 1N914 |
| Application | Extreme fast switches |
| Case | DO-35 (DO-204AH) |
| Weight | approx. 105 mg |
| Cathode Band Color | Black |
| Circuit Configuration | Single |
| Part Marking | V4148 |
| Packaging Option | TR/10K per 14 inch reel, 52 mm tape, 50K/box |
| Packaging Option | TAP/10K per ammopack, 52 mm tape, 50K/box |
| Repetitive Peak Reverse Voltage | 100 V; Tamb=25°C unless otherwise specified |
| Reverse Voltage | 75 V; Tamb=25°C unless otherwise specified |
| Peak Forward Surge Current | 2 A; tp=1 us, Tamb=25°C unless otherwise specified |
| Repetitive Peak Forward Current | 500 mA; Tamb=25°C unless otherwise specified |
| Forward Continuous Current | 300 mA; Tamb=25°C unless otherwise specified |
| Average Forward Current | 150 mA; VR=0, Tamb=25°C unless otherwise specified |
| Power Dissipation | 440 mW; l=4 mm, TL=45°C |
| Power Dissipation | 500 mW; l=4 mm, TL<=25°C |
| Thermal Resistance Junction to Ambient Air | 350 K/W; l=4 mm, TL=constant, Tamb=25°C unless otherwise specified |
| Junction Temperature | 175°C; Tamb=25°C unless otherwise specified |
| Storage Temperature Range | -65 to +150°C; Tamb=25°C unless otherwise specified |
| Forward Voltage | Max 1 V; IF=10 mA, Tamb=25°C unless otherwise specified |
| Reverse Current | Max 25 nA; VR=20 V, Tamb=25°C unless otherwise specified |
| Reverse Current | Max 50 uA; VR=20 V, Tj=150°C |
| Reverse Current | Max 5 uA; VR=75 V, Tamb=25°C unless otherwise specified |
| Breakdown Voltage | Min 100 V; IR=100 uA, tp/T=0.01, tp=0.3 ms |
| Diode Capacitance | Max 4 pF; VR=0 V, f=1 MHz, VHF=50 mV |
| Rectification Efficiency | Min 45%; VHF=2 V, f=100 MHz |
| Reverse Recovery Time | Max 8 ns; IF=IR=10 mA, iR=1 mA |
| Reverse Recovery Time | Max 4 ns; IF=10 mA, VR=6 V, iR=0.1 x IR, RL=100 ohm |
| Datasheet Status | request_only |
Product Overview
The Vishay 1N4148 is a small signal fast switching diode built as a silicon epitaxial planar diode. The datasheet identifies its application as extreme fast switches and lists the electrically equivalent diode as 1N914. The device uses a single circuit configuration with part marking V4148 for ordering codes 1N4148-TAP or 1N4148TR.
Mechanically, the 1N4148 is supplied in a DO-35 (DO-204AH) case with 25.4 mm minimum lead length on each side. The package data lists a maximum body length of 3.4 mm, approximate body diameter of 1.5 mm to 1.75 mm, maximum lead diameter of 0.55 mm, approximate weight of 105 mg, and a black cathode band.
Electrical limits include 100 V repetitive peak reverse voltage, 75 V reverse voltage, 300 mA forward continuous current, 150 mA average forward current at VR=0, and 500 mA repetitive peak forward current. The diode is specified with maximum 1 V forward voltage at IF=10 mA, maximum 4 pF diode capacitance at VR=0 V and 1 MHz, and reverse recovery time limits of maximum 8 ns or maximum 4 ns depending on the stated test circuit.
Key Features
- Silicon epitaxial planar diode construction
- Electrically equivalent to 1N914
- Single diode circuit configuration
- DO-35 (DO-204AH) axial-leaded case
- Black cathode band and V4148 marking
- 100 V repetitive peak reverse voltage
- 300 mA forward continuous current
- Maximum 4 pF diode capacitance
- Maximum 4 ns reverse recovery time
- Storage temperature range -65 to +150°C
Typical Applications
- Extreme fast switches
- Small signal fast switching
- Single diode switch paths
- 100 MHz rectification circuits
- Low capacitance diode switching
Procurement Notes
When requesting a quote for 1N4148, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of diode is the Vishay 1N4148?
The Vishay 1N4148 is specified as a small signal fast switching diode. Its construction is listed as a silicon epitaxial planar diode, and the datasheet identifies its application as extreme fast switches.
What package is used for the 1N4148 diode?
The 1N4148 uses a DO-35 (DO-204AH) axial-leaded case. The package data lists 25.4 mm minimum lead length per side, 3.4 mm maximum body length, and approximate body diameter from 1.5 mm to 1.75 mm.
What are the reverse voltage ratings for 1N4148?
The datasheet lists 100 V repetitive peak reverse voltage and 75 V reverse voltage at Tamb=25°C unless otherwise specified. Breakdown voltage is specified as minimum 100 V at IR=100 uA with the stated pulse condition.
What reverse recovery times are specified for 1N4148?
Two reverse recovery time limits are provided. One is maximum 8 ns at IF=IR=10 mA and iR=1 mA. The other is maximum 4 ns at IF=10 mA, VR=6 V, iR=0.1 x IR, and RL=100 ohm.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 28, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.