1N4148W-TP-HF - 100V 150mA Fast Switching Diode SOD-123 | MCC
MPN: 1N4148W-TP-HF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.1 | $0.10 |
| 10 | $0.085 | $0.85 |
| 100 | $0.062 | $6.20 |
| 500 | $0.048 | $24.00 |
| 1,000 | $0.035 | $35.00 |
| 3,000 | $0.026 | $78.00 |
1N4148W-TP-HF Overview
A small-signal switching diode is a two-terminal semiconductor device optimized for rapid transition between conducting and blocking states. The category sits within the broader hierarchy of discrete semiconductors -> diodes -> rectifier/switching diodes. Unlike power rectifiers, small-signal switching diodes trade current handling for ultra-fast switching, low junction capacitance, and sub-nanosecond recovery, making them the workhorse of analog signal processing, digital logic interfaces, and protection networks.
Key specifications include a repetitive peak reverse voltage (Vrrm) of 100 V, an average rectified forward current (If(AV)) of 150 mA, a non-repetitive peak forward surge current (Ifsm) of 4.0 A for an 8.3 ms half-sine pulse, and a total power dissipation of 400 mW. The diode exhibits a typical junction capacitance of 4.0 pF at 0 V and a maximum reverse leakage current of 1.0 µA at 75 V, ensuring minimal loading in high-impedance circuits and clean switching behavior in pulse and clamp topologies.
Architecturally, the 1N4148W-TP-HF uses a planar silicon epitaxial junction construction. The "HF" suffix denotes a Halogen-Free finish, supporting lead-free reflow profiles and RoHS-compliant assembly. The SOD-123 package provides a low thermal resistance footprint suitable for handheld, USB-powered, and IoT-class designs where every square millimeter of board real estate matters.
Typical applications include high-speed switching circuits, logic gate steering, analog signal clamping, freewheeling protection for small inductors, and reverse-polarity protection on low-current rails. It is also commonly used in voltage doublers, ring modulators, sample-and-hold circuits, and as a general-purpose flyback diode.
When designing with the 1N4148W-TP-HF, observe the 400 mW power dissipation limit. For continuous 150 mA conduction at 1 V forward drop, derate linearly above 25 °C ambient. Use a 0603 or larger copper pad to spread heat. Verify that pulse operation stays within the Ifsm rating of 4.0 A for transient surges.
Drop-in alternatives for 1N4148W-TP-HF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with 1N4148W-TP-HF (same form factor and footprint) — differing in Diode Type, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
1N4148W-TP
✅ Drop-In✓ In Stock
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View Datasheet →1N4148WX-TP
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1N4148W-7-F
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1N4148W-E3-08
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1N4148W
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BAS16
✅ Drop-In📋 Reference alternative (not in catalog)
1N4148W-TP-HF Maximum Ratings & Electrical Characteristics
| Manufacturer | Micro Commercial Components (MCC) |
| Diode Type | Small Signal Switching Diode |
| Package | SOD-123 |
| Mounting Type | Surface Mount |
| Repetitive Peak Reverse Voltage (Vrrm) | 100 V |
| Average Rectified Forward Current (If(AV)) | 150 mA |
| Non-Repetitive Peak Forward Surge Current (Ifsm) | 4.0 A (8.3 ms half-sine) |
| Forward Voltage (Vf) Max | 1.25 V at 150 mA |
| Reverse Recovery Time (trr) Max | 4 ns |
| Reverse Leakage Current (Ir) Max | 1.0 µA at 75 V |
| Total Power Dissipation (Pd) | 400 mW |
| Junction Capacitance (Cj) | 4.0 pF at 0 V, 1 MHz |
| Operating Temperature Range | -65 °C to +150 °C |
| Halogen Free | Yes (HF suffix) |
| RoHS Status | Compliant |
1N4148W-TP-HF Pin Configuration
| Pin 1 | A (Anode) — Anode terminal; positive side of the diode |
| Pin 2 | K (Cathode) — Cathode terminal; marked with colored band on package |
Typical Applications
1N4148W-TP-HF is suitable for 7 applications: Logic-Level Signal Steering and OR-ing, Flyback and Freewheeling Protection, Reverse-Polarity Protection, Analog Signal Clamping and Protection, High-Frequency Rectification in Detector Circuits, Voltage Multiplier and Charge Pump Stages, Sample-and-Hold and Switching Multiplexer Circuits.
Logic-Level Signal Steering and OR-ing
The 1N4148W-TP-HF is widely used to steer logic-level signals between two or more sources, such as combining multiple power-good outputs or implementing diode-OR redundancy in low-voltage digital rails. Its 4 ns reverse recovery time ensures the diode turns off fast enough to prevent logic contention in high-speed data paths, and the 100 V Vrrm provides ample margin for transients on 3.3 V or 5 V logic buses. With 150 mA continuous current capability, it can source typical logic fan-out loads without approaching its rating. The SOD-123 footprint integrates easily into dense digital designs where through-hole 1N4148 parts would consume excessive board area. Designers typically use two 1N4148W-TP-HF diodes in a diode-OR configuration to combine redundant supply rails with minimal voltage drop (~0.7 V per diode at low current).
Recommended
Flyback and Freewheeling Protection
The 1N4148W-TP-HF is a textbook choice for flyback protection across small inductors such as relay coils, small solenoids, and low-current motor windings. When the driving transistor switches off, the inductor's collapsing magnetic field generates a high-voltage reverse spike that could otherwise destroy the switching device; placing the 1N4148W-TP-HF in reverse-bias across the inductor safely clamps this spike. Its 4 ns trr is more than sufficient for switching frequencies up to several hundred kHz, and the 100 V reverse rating comfortably handles the L*di/dt spikes produced by small signal inductors. The 150 mA continuous rating suits relay coils under 50 mA steady-state. For larger inductive loads, the 4.0 A Ifsm surge rating handles the initial kickback for 8.3 ms pulses typical of relay de-energization events.
Recommended
Reverse-Polarity Protection
The 1N4148W-TP-HF delivers reliable reverse-polarity protection on low-current power rails up to 150 mA continuous. Placed in series with the positive input, the diode blocks reverse battery or supply-miswire events that would otherwise damage downstream circuitry. At 150 mA, the forward drop is approximately 1.0 V, which is acceptable for most 5 V or higher rails but may require budgeting for a small efficiency loss on 3.3 V systems. The 100 V reverse rating far exceeds typical battery voltages, providing robust protection against supply transients. The SOD-123 package minimizes the PCB footprint compared to the through-hole DO-35 1N4148. Designers often use a P-channel MOSFET for higher-current rails but the 1N4148W-TP-HF remains the lowest-cost option for sub-150 mA applications where the 1 V drop is acceptable.
Recommended
Analog Signal Clamping and Protection
In analog signal paths, the 1N4148W-TP-HF provides hard clamping to protect downstream op-amps, ADCs, and microcontroller inputs from voltage transients. Two diodes arranged anti-parallel between the signal line and the supply rails form a bidirectional clamp that limits excursion to within one diode drop of either rail. The 4 ns recovery ensures the diode disengages cleanly when the transient passes, avoiding signal distortion. With 4 pF typical capacitance, the part adds minimal loading to high-impedance nodes above 10 MHz. The 100 V Vrrm allows the diode to survive ESD and surge events far beyond normal signal levels, providing a robust front-end for instrumentation and audio inputs in industrial and test equipment.
Recommended
High-Frequency Rectification in Detector Circuits
The 1N4148W-TP-HF is widely used as the rectifying element in RF detector, demodulator, and envelope-detector circuits operating from a few MHz up to several hundred MHz. Its 4 ns reverse recovery and 4 pF junction capacitance are well-matched to demodulating AM and ASK-modulated signals in receiver front-ends, RFID tag circuits, and RF-ID badge readers. Compared to Schottky detectors, the 1N4148W-TP-HF offers higher reverse breakdown voltage (100 V vs 20-40 V typical), which is useful when the detector must tolerate large RF input swings without breakdown. The SOD-123 surface-mount package is mandatory in modern wireless designs where through-hole components are not an option.
Recommended
Voltage Multiplier and Charge Pump Stages
The 1N4148W-TP-HF is a classic building block in discrete voltage multipliers including Villard cascades, Greinacher doublers, and Cockcroft-Walton multiplier ladders used in low-power high-voltage generators. Its 4 ns reverse recovery allows operation at pump frequencies up to several hundred kHz, and the 100 V Vrrm enables stacking multiple stages to reach hundreds or thousands of volts for bias supplies, photomultiplier tubes, or small ion generators. The 150 mA current rating limits use to low-power applications such as bias tees, high-voltage probe supplies, or trigger circuits. The SOD-123 package permits compact cascade layouts on a single PCB. Designers commonly use 1N4148W-TP-HF stages to derive auxiliary high-voltage rails from a low-voltage oscillator without the cost of a dedicated high-voltage transformer.
Recommended
Sample-and-Hold and Switching Multiplexer Circuits
In sample-and-hold circuits and switching multiplexers, the 1N4148W-TP-HF acts as a fast switch that connects or isolates a storage capacitor from the signal source. Its 4 ns turn-off time minimizes aperture uncertainty and pedestal error, which are critical in precision data-acquisition systems. The 100 V reverse rating is well above typical 5 V or 12 V analog rails, and the 4 pF capacitance adds negligible charge injection for hold-capacitor values above 100 pF. The SOD-123 footprint suits high-density multiplexer ICs and discrete switch arrays on instrumentation front-ends. The 1N4148W-TP-HF is often paired with low-leakage hold capacitors (such as polypropylene or NP0 ceramic) to build simple track-and-hold stages for audio, instrumentation, and servo-loop applications.
Recommended
Recommended Products Summary
Engineering reference data for 1N4148W-TP-HF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 1N4148W-TP | 1N4148WX-TP | 1N4148W-7-F | 1N4148W-E3-08 | 1N4148W | BAS16 |
|---|---|---|---|---|---|---|---|
| Brand | Micro Commercial Components (MCC) | MCC | MCC | Diodes Incorporated | Vishay Intertechnology | onsemi | NXP Semiconductors |
| Package | SOD-123 | SOD-123 - same | SOD-123 - same | SOD-123 - same | SOD-123 - same | SOD-123 - same | SOD-123 - same |
| Repetitive Peak Reverse Voltage (Vrrm) | 100 V | 100 V | 100 V | 100 V | 100 V | 100 V | 100 V |
| Average Forward Current (If(AV)) | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 200 mA (+33%) |
| Reverse Recovery Time (trr) | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns |
| Forward Voltage (Vf max) | 1.25 V at 150 mA | 1.25 V at 150 mA | 1.25 V at 150 mA | 0.715 V at 1 mA | 1.0 V at 100 mA | 1.25 V at 150 mA | 1.25 V at 150 mA |
| Junction Capacitance (Cj) | 4.0 pF | 4.0 pF | 4.0 pF | 2.0 pF | 4.0 pF | 4.0 pF | 4.0 pF |
| Halogen-Free / RoHS | Yes / Yes (HF suffix) | Yes / Yes | Yes / Yes | Yes / Yes (-F suffix) | Yes / Yes (-E3) | Yes / Yes | Yes / Yes |
Key Differentiators
- Halogen-free finish in same SOD-123 footprint (vs 1N4148W-TP (without HF))
- Lower junction capacitance versus industry cross-references (vs 1N4148W-7-F (Diodes Incorporated))
- Drop-in compatible with multi-sourced 1N4148W platform (vs Industry 1N4148W family across MCC / Diodes / Vishay / onsemi / NXP)
Design Notes
Estimated: At 150 mA continuous forward current with Vf = 1.0 V (typical), the diode dissipates roughly 150 mW. The SOD-123 package is rated for 400 mW absolute maximum at 25 °C on the standard JEDEC EIA/JESD51 1S2P test board, with derating required above 25 °C. For continuous 150 mA operation, derate linearly to zero at 150 °C junction temperature. Provide at least 25 mm² of copper pad area on each terminal to spread heat; without copper spreading, the effective steady-state current capability drops below 100 mA. Always compute worst-case dissipation including surge events.
Do not confuse the 1N4148W-TP-HF Vrrm rating (100 V repetitive) with its DC blocking rating (75 V). For circuits that hold reverse bias continuously, do not exceed 75 V DC. Also beware that the 150 mA If(AV) rating assumes single-sided mounting on a standard FR-4 test board; hand-soldered prototypes with minimal copper will derate significantly. For pulse currents up to 4.0 A Ifsm, the 8.3 ms half-sine rating must be observed - longer pulses require derating. Finally, ensure reflow profile peak temperature does not exceed 260 °C for the halogen-free finish.
Use 0805 or larger copper pad geometry on both anode and cathode lands. For high-frequency applications (above 10 MHz), keep the diode close to the protected node to minimize parasitic inductance and lead-loop area. A typical land pattern per IPC-7351 SOD-123 is 1.6 mm × 0.9 mm pad with 2.4 mm pitch. Forbid running noisy digital traces directly under the diode or between its pads, as the SOD-123's exposed pad and lead frame can capacitively couple switching noise into analog signal paths. Place a ground pour on the opposite PCB layer directly under the diode to provide a low-impedance return.
Compliance Information
HF suffix denotes halogen-free finish per MCC product documentation. RoHS and REACH compliant. AEC-Q100 automotive qualification NOT present on the standard 1N4148W-TP-HF - choose automotive-grade variants such as Vishay 1N4148W-E3-08 (AEC-Q101) for automotive applications.
