1N4148W-TP - 100V 150mA High-Speed Switching Diode | MCC
料号： 1N4148W-TP ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.06 | $0.06 |
| 10 | $0.05 | $0.50 |
| 100 | $0.035 | $3.50 |
| 500 | $0.025 | $12.50 |
| 1,000 | $0.018 | $18.00 |
| 5,000 | $0.014 | $70.00 |
1N4148W-TP 概述
A small-signal switching diode is a two-terminal semiconductor device designed for fast turn-on/turn-off behavior rather than power rectification. The 1N4148W-TP belongs to the well-known 1N4148 family of silicon epitaxial planar diodes, which sit in the hierarchy: switching diode -> small-signal diode -> rectifier diode -> discrete semiconductor. Their defining trait is a sub-5 ns reverse recovery time, enabling use in high-frequency signal paths and logic-level clamping where standard rectifiers would be too slow.
Key features include a forward voltage of 1.25 V maximum at the rated current, a non-repetitive peak forward surge current (Ifsm) of 4.0 A for 8.3 ms half-sine pulses, and a low capacitance of approximately 1.5 pF at 0 V. The diode is rated for a power dissipation of 400 mW on the standard FR-4 test board and 100 mW continuous die-off. The molded SOD-123 plastic package is RoHS-compliant, lead-free, and suitable for automated pick-and-place assembly, with a thermal resistance of approximately 357 C/W junction-to-ambient on the manufacturer test board.
The 1N4148W-TP is widely used as a logic-level clamp, freewheeling diode, signal rectifier, and polarity protection element in consumer, industrial, and communication electronics. Its 4 ns switching speed lets it operate cleanly in circuits up to several hundred megahertz, while the 100 V reverse rating provides ample headroom for 5 V, 12 V, and 24 V rails, as well as analog signal lines up to tens of volts.
Typical applications include high-frequency rectifiers in switch-mode power supplies, freewheeling protection for small relays and solenoids, polarity protection on USB and battery inputs, and general signal switching in MCU and logic-level circuits. Designers should observe the 150 mA continuous current rating and 4.0 A surge rating, and note that SOD-123 thermal dissipation is modest - keep trace copper pours generous to avoid thermal runaway in continuous operation.
This page synthesizes distributor pricing, drop-in cross-brand equivalents, and selection notes not aggregated in the standalone MCC datasheet PDF.
直接替换替代料： 1N4148W-TP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： 1N4148W-TP （相同外形与封装尺寸） ——差异在于 Diode Type, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
1N4148W-7-F
✅ 直接替换📋 参考替代料（不在目录中）
1N4148W-E3-08
✅ 直接替换📋 参考替代料（不在目录中）
1N4148W
✅ 直接替换📋 参考替代料（不在目录中）
1N4148W-HE3-08
✅ 直接替换📋 参考替代料（不在目录中）
1N4148W RHG
✅ 直接替换📋 参考替代料（不在目录中）
BAS16W
✅ 直接替换📋 参考替代料（不在目录中）
1N4148W-TP 最大额定值与电气特性
| Diode Type | Switching Diode (Small Signal) |
| Configuration | Single |
| Repetitive Peak Reverse Voltage (Vrrm) | 100 V |
| RMS Reverse Voltage (Vr(RMS)) | 71 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) | 1.25 V max at If = 150 mA |
| Reverse Recovery Time (trr) | 4 ns |
| Diode Capacitance (Cd) | 1.5 pF (typ) |
| Power Dissipation (Pd) | 400 mW (test board); 100 mW (die rating) |
| 工作结温 | -55C to +150C (typ) |
| 封装 | SOD-123 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (Lead-Free) |
1N4148W-TP 引脚配置
| 引脚 1 | Anode — Positive terminal (no cathode band on this side) |
| 引脚 2 | Cathode — Negative terminal; marked by cathode band on package body |
典型应用
1N4148W-TP 适用于 6 应用s: Relay Coil Snubber / Freewheeling Diode, Logic-Level Signal Clamping, Polarity Protection (Reverse Battery), High-Frequency Rectification (Signal Path), Switch-Mode Power Supply Snubber, Voltage Multiplier and Charge Pump Stages.
Relay Coil Snubber / Freewheeling Diode
The 1N4148W-TP's 100 V Vrrm and 4 ns reverse recovery make it well suited as a freewheeling diode across small relay coils and solenoid windings. When a relay coil de-energizes, the inductive kickback can generate hundreds of volts; placing the 1N4148W-TP with its cathode to the positive coil terminal safely clamps the back-EMF to one forward voltage drop. The 150 mA If(AV) rating exceeds typical 5 V, 12 V, and 24 V relay coil currents, and the 4.0 A Ifsm rating handles inrush transients on power-up. Unlike slower rectifiers, the 4 ns recovery ensures clean switch-off without oscillation, which is critical for low-voltage logic and microcontrollers downstream of the relay.
推荐
Logic-Level Signal Clamping
For protecting MCU GPIO pins and analog signal inputs from transients, the 1N4148W-TP is one of the most-used clamp diodes in industry. Its 100 V reverse rating means a single diode protects against ESD and inductive spikes far above any 3.3 V or 5 V logic rail, while the 4 ns trr ensures the clamp does not slow high-speed edges. In typical two-diode clamping across a signal line, the cathode ties to VDD and the anode to GND; the 1N4148W-TP's 1.25 V max Vf at 150 mA stays well below the typical 50 mA clamping load, keeping dissipation under 75 mW even during aggressive ESD events.
推荐
Polarity Protection (Reverse Battery)
For low-current portable electronics, the 1N4148W-TP can be wired in reverse across the input to blow a fuse on reverse polarity, or in series with the load to block reverse current. Its 100 V rating is far above any 1S Li-ion or 3V coin-cell stack, and the 150 mA rating is appropriate for sensor nodes, BLE beacons, and IoT modules drawing under 100 mA. While a Schottky offers lower forward drop (better for high-current paths), the 1N4148W-TP's lower leakage at temperature is preferred for battery-backed designs that sit on the shelf for months.
推荐
High-Frequency Rectification (Signal Path)
The 4 ns reverse recovery of the 1N4148W-TP permits its use in RF detector circuits, envelope detectors, and high-speed sample-and-hold rectifiers operating up to several hundred megahertz. In a typical half-wave envelope detector for AM demodulation or RSSI the cathode drives the load and the anode takes the RF input through a coupling capacitor. The 1.5 pF junction capacitance is low enough to avoid significant attenuation at HF and VHF, while the 100 V reverse voltage handles peaks comfortably. Compared to general-purpose 1N400x rectifiers (30 us trr), the 1N4148W-TP preserves signal shape at multi-MHz data rates.
推荐
Switch-Mode Power Supply Snubber
Across the secondary side of an isolated switching converter, the 1N4148W-TP serves as a primary-side RCD snubber diode or a low-current auxiliary supply rectifier. In RCD snubbers across a flyback transformer primary, the 1N4148W-TP's 100 V rating handles 24 V and 48 V bus transients, while its 4 ns trr is sufficient for sub-200 kHz converters. The 400 mW dissipation rating supports continuous snubbing duty cycle below 25%, typical for fixed-frequency converters below 50 W. Designers should verify that the average forward current stays below 150 mA and that the 4.0 A surge is not exceeded during startup.
推荐
Voltage Multiplier and Charge Pump Stages
In Cockcroft-Walton voltage multipliers and Dickson charge pumps, the 1N4148W-TP is widely used as the series switching element where its 4 ns trr is essential. A 4-stage multiplier built from 1N4148W-TP can generate 10x the input peak with a few mA load current. The 100 V reverse rating sets the maximum number of stages before reverse breakdown, and the 1.25 V Vf drop directly subtracts from the output voltage at every stage, so this diode is only practical when the input source is several volts. For low-voltage (under 2 V) inputs, a Schottky charge pump diode is preferable despite the lower reverse voltage.
推荐
推荐产品汇总
工程参考数据： 1N4148W-TP ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 1N4148W-7-F | 1N4148W-E3-08 | 1N4148W | 1N4148W RHG |
|---|---|---|---|---|---|
| Brand | Micro Commercial Components (MCC) | Diodes Incorporated | Vishay Intertechnology | onsemi | Taiwan Semiconductor |
| Package | SOD-123 | 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 |
| Average Forward Current (If(AV)) | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA |
| Peak Surge Current (Ifsm, 8.3 ms) | 4.0 A | 2.0 A | 2.0 A | 2.0 A | 2.0 A |
| Reverse Recovery Time (trr) | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns |
| Forward Voltage (Vf max @ If) | 1.25 V @ 150 mA | 1.25 V @ 150 mA | 0.72 V typ @ 10 mA; 1.0 V @ 100 mA | 1.0 V @ 100 mA | 1.25 V @ 100 mA |
| Automotive Grade (AEC-Q101) | No (commercial) | No (commercial); 1N4148WQ-7-F is Q101 | No (commercial); 1N4148W-HE3-08 is Q101 | No | No |
关键差异点
- Higher peak surge current (4.0 A vs 2.0 A) （对比 1N4148W-7-F (Diodes Incorporated))
- Automotive-grade cross-reference availability (1N4148W-HE3-08) （对比 1N4148W-E3-08 (Vishay, commercial))
- Competitive lead-time via multi-source SOD-123 footprint （对比 Cross-brand equivalents)
设计说明
The 1N4148W-TP is rated for 400 mW on the MCC test board and 100 mW on the die. In practice, thermal performance in a real PCB depends on copper-pad area: a minimum 50 mm^2 copper pour per terminal keeps junction-to-ambient thermal resistance under 200 C/W. Above 1 A pulsed, derate the surge width to stay inside the 8.3 ms half-sine 4 A Ifsm spec.
Use SOD-123 land patterns that match IPC-7351 nominal (about 3.6 mm x 1.8 mm pad with 0.9 mm gap). Route the cathode trace as a wider polygon (>= 0.5 mm) to carry 150 mA continuous with negligible voltage drop. Confirm the silkscreen cathode-bar mark is visible after reflow - some no-clean flux residues can hide the polarity mark.
Do not substitute the 1N4148WX-TP (SOD-323) on the same footprint - the SOD-123 land pattern will not align with the smaller SOD-323 package, and the part will sit on one pad only. Verify the package code in the MPN: 'W' suffix means SOD-123, 'WX' means SOD-323, 'WS' is the SOT-323 variant. Substituting across these prefixes causes open circuits or shorts.
合规信息
RoHS-compliant with lead-free matte-tin finish per MCC datasheet. Halogen-free per MCC product page. AEC-Q101 variants available from Vishay (1N4148W-HE3-08) for automotive applications; the standard 1N4148W-TP is commercial grade.
