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Diodes Incorporated 1N4148WSF-7
- Part No.:
- 1N4148WSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
1N4148WSF-7.pdf
- Description:
- DIODE GP 100V 250MA SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:543,307
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Product details
Overview
1N4148WSF-7 from Diodes Incorporated is a surface-mount fast-switching silicon signal diode in SOD323F package, rated for 100 V peak reverse voltage, 250 mA forward current, and 4 ns reverse recovery time. It delivers low forward voltage (0.715 V @ 1 mA), low junction capacitance (1.5 pF), and low leakage (500 nA @ 80 V), enabling high-speed clamping and waveform shaping in compact digital logic interfaces.
For engineers reviewing the 1N4148WSF-7 datasheet, 1N4148WSF-7 pinout, 1N4148WSF-7 application, or 1N4148WSF-7 equivalent, key selection criteria include switching speed, junction capacitance, thermal resistance (313 °C/W), lead-free compliance, and SOD323F footprint compatibility with high-density PCB layouts.
Technical Context
This diode operates as a unidirectional, low-capacitance, fast-recovery switching element optimized for signal routing, transient suppression, and logic-level clamping in high-frequency digital circuits. Its copper alloy leadframe ensures efficient thermal dissipation (400 mW power rating) and stable performance across –55 °C to +150 °C ambient range.
The device exhibits nonlinear I–V behavior typical of silicon PN junctions, with forward conduction onset near 0.6 V and sharp reverse breakdown beyond 100 V. Reverse recovery is characterized under standardized 10 mA IF/IR conditions with 0.1×IR tail current, yielding ≤4 ns trr - critical for minimizing switching losses in clocked and pulse-driven systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Reverse Voltage | 100 V - supports DC blocking and transient suppression up to industrial 80 V bus levels |
| Forward Voltage | 0.715 V @ 1 mA - enables low-loss signal clamping without loading TTL/CMOS inputs |
| Reverse Recovery Time | 4 ns - ensures minimal switching distortion in >10 MHz digital timing paths |
| Junction Capacitance | 1.5 pF @ 0 V - preserves signal integrity in RF-coupled and high-speed data lines |
| Leakage Current | 500 nA @ 80 V - maintains high-impedance state in standby and sampling circuits |
| Power Dissipation | 400 mW - sufficient for intermittent surge handling on FR-4 PCB with 2 oz copper pad |
| Thermal Resistance | 313 °C/W - defines derating slope (see Figure 1) for ambient temperatures above 25 °C |
Pinout & Package
SOD323F is a miniature surface-mount plastic package measuring 1.28 mm × 0.71 mm × 0.40 mm, featuring a copper alloy leadframe with matte tin plating, UL 94V-0 mold compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry point | Connected to higher-potential node during conduction; requires layout clearance for thermal relief |
| Cathode (K) | Forward current exit / polarity reference | Marked by cathode band on package top view; ties to ground or lower-voltage rail in clamp configurations |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 4 ns trr enables reliable operation in 10–100 MHz clock distribution and pulse shaping |
| Low forward voltage | 0.715 V @ 1 mA reduces voltage drop in signal-level protection networks |
| Low junction capacitance | 1.5 pF minimizes capacitive loading on high-impedance nodes like oscillator feedback paths |
| Thermally efficient leadframe | Copper alloy construction supports 400 mW dissipation with 313 °C/W RθJA on standard FR-4 |
| Green RoHS compliance | Fully lead-free, halogen- and antimony-free per Diodes Inc. specification (<900 ppm Br/Cl, <1000 ppm Sb) |
Applications
| Digital Logic Clamping | High-Speed Signal Routing |
|---|---|
Use Scenario: Protecting CMOS input pins from overvoltage transients during hot-plug or ESD events. IC Role / Device Role: Unidirectional clamping diode shunting excess voltage to VCC or GND. Use Value: 4 ns recovery and 1.5 pF capacitance prevent signal edge degradation while limiting overshoot to safe levels. | Use Scenario: Steering clock or data pulses between multiple FPGA I/O banks with minimal skew. IC Role / Device Role: Passive signal selector or isolation element in multiplexed timing paths. Use Value: Low VF and low CT preserve rise/fall times and reduce inter-symbol interference in 50–100 MHz serial links. |
| Waveform Shaping | Sample-and-Hold Protection |
Use Scenario: Generating clean square waves from sine or triangle wave sources in function generators. IC Role / Device Role: Fast-switching limiter defining upper/lower amplitude bounds. Use Value: Sub-5 ns trr ensures accurate zero-crossing detection and harmonic fidelity up to 20 MHz fundamental. | Use Scenario: Isolating analog front-end inputs during ADC conversion cycles to prevent hold capacitor discharge. IC Role / Device Role: Bidirectional guard diode (used in back-to-back configuration) limiting input swing. Use Value: 500 nA leakage at 80 V prevents measurable drift in 16-bit+ sample-and-hold circuits over 10 µs acquisition windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148W-7 | SOD-123 package (larger footprint, higher RθJA = 357 °C/W), identical electrical specs | Less suitable for ultra-dense layouts; better thermal margin in low-airflow environments | Select when board space allows and thermal derating headroom is prioritized over miniaturization |
| BAT54C-7-F | 0.33 V VF @ 1 mA (Schottky), 5 pF CT, 30 V VR, faster trr (~1 ns) but lower voltage rating | Not interchangeable in 80–100 V applications; preferred for low-voltage, ultra-high-speed clamping | Choose only where reverse voltage ≤30 V and sub-nanosecond recovery is mandatory |
Compared with 1N4148W-7 and BAT54C-7-F, the 1N4148WSF-7 uniquely balances SOD323F miniaturization, 100 V capability, and 4 ns switching-making it optimal for space-constrained, medium-voltage digital interface protection.
Availability
1N4148WSF-7 is available at Aetrix Electronics and suitable for digital logic protection, high-speed signal routing, and waveform shaping applications requiring stable component supply, consistent parametric performance, and full RoHS/Green compliance.
Supply support for 1N4148WSF-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The 1N4148WSF-7 belongs to Diodes' general-purpose fast-switching diode product line, engineered specifically for high-density, high-frequency signal integrity applications where miniaturization and parametric consistency are critical.
FAQ
What is the maximum operating temperature for the 1N4148WSF-7?
The 1N4148WSF-7 has an operating junction temperature range of –55 °C to +150 °C. Its thermal resistance (RθJA = 313 °C/W) applies to standard FR-4 PCB mounting with minimum recommended 2 oz copper pads. Derating begins above +25 °C ambient, reaching zero power at +150 °C ambient per Figure 1 in DS36010 Rev. 4–2.
Is the 1N4148WSF-7 suitable for use in 5 V logic-level clamping?
Yes - its 0.715 V forward voltage at 1 mA ensures minimal loading on 5 V TTL/CMOS outputs, while its 100 V reverse rating provides ample margin against ESD transients. The 1.5 pF junction capacitance avoids signal integrity issues on lines operating up to 100 MHz, making it ideal for protecting microcontroller GPIOs and FPGA I/O banks.
How does the SOD323F package compare to SOD-123 in thermal performance?
The SOD323F package has higher thermal resistance (313 °C/W) than the larger SOD-123 (357 °C/W is incorrect - actual SOD-123 RθJA is ~357 °C/W per Diodes' 1N4148W-7 datasheet, meaning SOD323F is thermally superior). The SOD323F's copper alloy leadframe and optimized pad layout deliver lower RθJA despite smaller size, enabling higher power density in space-constrained designs.
Can the 1N4148WSF-7 replace older through-hole 1N4148 variants?
Electrically yes - all key parameters (VF, trr, VR, IR) match legacy 1N4148 specifications. However, the SOD323F footprint is not mechanically compatible with axial-lead or DO-35 packages. Replacement requires PCB redesign to accommodate the 1.28 mm × 0.71 mm surface-mount outline and reflow-compatible pad layout per AP02001.
1N4148WSF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 100 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 150 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 500 nA @ 80 V
- Capacitance @ Vr, F:
- 1.5pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N4148WSF-7 FAQ
1.How can I place an order for 1N4148WSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4148WSF-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N4148WSF-7 reliable?
The price and inventory of 1N4148WSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4148WSF-7 is usually 5 days.
3.What payment methods are accepted for 1N4148WSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4148WSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4148WSF-7?
1N4148WSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4148WSF-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N4148WSF-7?
For technical support, including 1N4148WSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4148WSF-7 requirements.
6.How does Aetrix verify that 1N4148WSF-7 is sourced from the original manufacturer or authorized distributors?
All 1N4148WSF-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N4148WSF-7 meets industry standards.
7.What is the process for return or replacement of 1N4148WSF-7?
All 1N4148WSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4148WSF-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N4148WSF-7 part is unused and in its original packaging.
Return procedure for 1N4148WSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4148WSF-7 Tags
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