1N4148WT-7-F - 100V 150mA Fast Switching Diode SOD-523 | Diodes Inc
MPN： 1N4148WT-7-F ✓ 啟用中1N4148WT-7-F 概覽
A small-signal switching diode is a two-terminal semiconductor device optimized for fast transitions between conducting and blocking states at low currents (typically under 500mA). Unlike power rectifiers designed for high-current 50/60Hz rectification, switching diodes prioritize reverse recovery time (trr), junction capacitance, and leakage current. They sit within the broader hierarchy: diode -> semiconductor -> discrete component -> electronic part, and are typically used for signal routing, logic-level clamping, and high-frequency demodulation rather than power conversion.
Key features include a 100V peak repetitive reverse voltage (VRRM), 125mA continuous forward current (some datasheets cite 150mA depending on mounting conditions), 250mW power dissipation, and operating junction temperature from -65C to +150C. The SOD-523 footprint occupies only 1.6mm x 0.8mm PCB area, enabling dense board layouts in portable and wearable products. Reverse leakage is specified at 25nA at 25V, providing excellent isolation when reverse-biased.
The 1N4148WT-7-F uses a planar-passivated silicon epitaxial junction that achieves sub-5ns reverse recovery. Compared to the industry-standard 1N4148 in a glass DO-35 package, the 1N4148WT-7-F offers equivalent electrical behavior at high frequency with a footprint roughly 10x smaller, which is why it has become the default small-signal switching diode in surface-mount designs.
Typical applications include high-speed switching in digital logic circuits, signal demodulation in AM/FM receivers, reverse-polarity protection in low-current paths, clamping in protection circuits, ring modulation in audio, and general-purpose rectification below 200mA. It is also widely used in high-density consumer electronics where the 1N4148's TO-92/DO-35 footprint is too large.
When designing with this device, observe the 100V maximum repetitive reverse voltage and ensure peak inverse voltage in the application remains below this rating. The SOD-523 thermal resistance (junction-to-ambient) is approximately 540 C/W, limiting practical continuous dissipation to under 250mW without aggressive copper thermal relief. Always place reverse-bias protection where inductive kickback could exceed the 100V rating.
This page synthesizes distributor pricing, drop-in alternatives from Diodes Incorporated and competitors, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 1N4148WT-7-F — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： 1N4148WT-7-F （相同外形與佔位） — 差異在於 Diode Type, RoHS Status.
1N4148WT-7
✅ 直接替換聯絡詢價
查看資料表 →1N4148WT
✅ 直接替換📋 參考替代品（不在目錄中）
1N4148WT-7-F 最大額定值與電氣特性
| Diode Type | Small Signal Fast Switching |
| Peak Repetitive Reverse Voltage (VRRM) | 100 V |
| Average Rectified Forward Current (IO) | 125 mA (some sources cite 150 mA) |
| Peak Forward Surge Current (IFSM) | 2 A |
| Maximum Forward Voltage (VF) at IF=10mA | 715 mV |
| Maximum Forward Voltage (VF) at IF=100mA | 1.25 V |
| Reverse Recovery Time (trr) | 4 ns |
| Reverse Leakage Current (IR) at VR=25V | 25 nA |
| Power Dissipation (PD) | 250 mW |
| 工作接面溫度 | -65 C to +150 C |
| Storage Temperature Range | -65 C to +150 C |
| 封裝 / 外殼 | SOD-523 |
| 安裝類型 | Surface Mount |
| 腳位數 | 2 |
| MSL 等級 | 1 (per JEDEC J-STD-020) |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes (matte-tin finish, F-suffix) |
1N4148WT-7-F 腳位配置
| 腳位 1 | Cathode (K) — Cathode terminal (banded end) |
| 腳位 2 | Anode (A) — Anode terminal |
典型應用
1N4148WT-7-F 適用於 6 應用s: High-Speed Signal Switching in Digital Logic, Signal Demodulation in AM/FM Receivers, Reverse-Polarity Protection at Low Current, Logic-Level Clamping in Protection Circuits, Ring Modulation and Wave Shaping in Audio, General-Purpose Rectification Below 200mA.
High-Speed Signal Switching in Digital Logic
The 1N4148WT-7-F's 4 ns reverse recovery time and 25 nA leakage make it ideal for high-speed signal switching in digital logic interfaces. With 100V VRRM headroom, it reliably handles transient spikes on 5V or 3.3V logic buses. Place between microcontroller GPIO and external load for level shifting or isolation. Compared to general-purpose signal diodes, its sub-5ns trr supports switching frequencies up to 100 MHz without waveform distortion.
推薦
Signal Demodulation in AM/FM Receivers
AM demodulation circuits rely on the 1N4148WT-7-F's 4 ns trr and low junction capacitance (~2 pF) to recover audio envelopes from 455 kHz to 10.7 MHz IF stages without distortion. The 100V reverse rating handles the peak inverse voltage from local oscillator injection. The SOD-523 footprint allows dense receiver designs where multiple diodes populate a single IF strip, while the 25 nA leakage preserves detector sensitivity for weak signals.
推薦
Reverse-Polarity Protection at Low Current
Series-connected 1N4148WT-7-F provides low-loss reverse-polarity protection for USB ports, sensor supplies, and battery inputs under 100mA. At 1A forward, the 1.25V drop dissipates 1.25W - acceptable for sub-100mA loads where Schottky alternatives like B5819W add cost. Its 100V reverse stand-off handles inductive kickback from relay or motor loads on the protected rail, making it more robust than 30V-rated TVS alternatives.
推薦
Logic-Level Clamping in Protection Circuits
The 1N4148WT-7-F's fast switching and 100V stand-off make it ideal for clamping logic-level signals in ESD-sensitive interfaces. Place from data line to supply rail (or ground) to shunt overvoltage transients. The 4ns response captures fast ESD events that slower protection diodes miss, while the SOD-523 footprint fits between high-density board traces where larger packages would not fit. Lower capacitance than TVS alternatives preserves signal integrity.
推薦
Ring Modulation and Wave Shaping in Audio
Audio ring modulators and wave shapers rely on the 1N4148WT-7-F's matched forward voltage characteristics and symmetric switching to create balanced modulation products. Its 1.25V forward voltage at 100mA provides predictable drop across matched diode pairs. The 4ns recovery time handles audio bandwidth plus harmonics without introducing phase distortion. The compact SOD-523 footprint enables dense analog audio designs in stompbox and synthesizer circuits.
推薦
General-Purpose Rectification Below 200mA
The 1N4148WT-7-F handles general-purpose rectification tasks below 200mA where a 1N400x series rectifier would be overkill. Its 4ns trr outperforms 1N4007's 30us recovery by 7500x in switching applications. Use it in low-current flyback, half-wave rectifiers, and charge pumps. The 250mW power dissipation limits continuous rectification to under 125mA at full 100V reverse, but its small size enables dense rectifier arrays in signal-level power supplies.
推薦
推薦產品摘要
工程參考資料，適用於 1N4148WT-7-F — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 1N4148WS-7-F | 1N4148WT-7 | 1N4148WT | BAS16 | LL4148 |
|---|---|---|---|---|---|---|
| Package | SOD-523 (1.6 x 0.8 mm) | SOD-323 (larger) | SOD-523 (same) | SOD-523F (same footprint) | SOT-23-3 | SOD-80 Mini-MELF |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | onsemi | Diodes Incorporated | Vishay Intertechnology |
| Peak Reverse Voltage (VRRM) | 100 V | 100 V | 100 V | 75 V | 75 V to 100 V | 100 V |
| Average Forward Current (IO) | 125 mA | 150 mA | 125 mA | 200 mA | 200 mA | 150 mA |
| Reverse Recovery Time (trr) | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns | 4 ns |
| Forward Voltage (VF) at IF | 1.25 V at 100 mA | 1.25 V at 100 mA | 1.25 V at 100 mA | 0.72 V at 5 mA | 0.855 V at 10 mA | 1.0 V at 50 mA |
| Peak Surge Current (IFSM) | 2 A | 2 A | 2 A | 2 A | 2 A | 2 A |
| Power Dissipation (PD) | 250 mW | 200 mW | 250 mW | 200 mW | 250 mW | 500 mW |
| RoHS Compliant | Yes (Pb-free) | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- Ultra-compact SOD-523 footprint for high-density designs (對比1N4148W-7-F (SOD-123))
- 4 ns reverse recovery time at competitive cost (對比1N4007 (general-purpose rectifier))
- Pb-free, RoHS-compliant with full automotive-grade option available (對比1N4148WTQ (automotive grade))
設計說明
The SOD-523 package has a thermal resistance of approximately 540 C/W junction-to-ambient on a standard JEDEC test board. At maximum continuous forward current of 125 mA with VF=1.25V, power dissipation reaches 156 mW, producing a junction temperature rise of 84 C above ambient. Without additional copper thermal relief, derate current by 1 mA per C above 25 C ambient to keep Tj below 150 C maximum. For higher dissipation, use a larger SOD-123 footprint like 1N4148W-7-F (theta_JA ~ 350 C/W).
SOD-523 pad design requires precise land pattern geometry per IPC-7351: two pads of 0.6 mm x 0.8 mm with 0.85 mm pitch, connected to traces at least 0.2 mm wide. Avoid placing the diode directly parallel to high-current traces that could inject heat through the copper. For automated optical inspection (AOI), orient the cathode band consistently across the board for easy visual verification. Do not use SOD-523 footprints for hand-soldering - the 0.8 mm terminal width is below typical iron tip sizes.
At high frequencies (>50 MHz), junction capacitance (~2 pF at 0 V) becomes significant and can attenuate signal edges. For RF applications above 100 MHz, calculate capacitive loading: at 100 MHz, 2 pF presents an impedance of 800 ohms - negligible for high-impedance circuits but problematic for 50 ohm transmission lines. Add a series resistor to isolate the diode capacitance from the transmission line, or choose a lower-capacitance switching diode if signal integrity is critical.
Three common pitfalls when designing with 1N4148WT-7-F: (1) Exceeding the 100V VRRM with inductive kickback - always add a flyback diode or TVS clamp across inductive loads. (2) Reversing anode-cathode - the SOD-523 cathode band can be hard to see; orient consistently on the PCB and verify with a DMM before power-up. (3) Confusing 1N4148WT (SOD-523) with 1N4148WS (SOD-323) - the latter has a different pin assignment and footprint. Always check the package outline drawing against the land pattern before substituting.
合規資訊
F-suffix indicates Pb-free matte-tin finish. Not AEC-Q100/Q101 qualified - use 1N4148WTQ for automotive. RoHS 3 compliant per Directive 2015/863/EU. Halogen-free per IEC 61249-2-21. MSL 1 per JEDEC J-STD-020.
