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Diodes Incorporated 1N4448WS-7-F
- Part No.:
- 1N4448WS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
1N4448WS-7-F.pdf
- Description:
- DIODE GEN PURP 75V 500MA SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:271,489
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Product details
Overview
1N4448WS-7-F from Diodes Incorporated is a surface-mount fast-switching silicon signal diode in SOD323 package, rated for 75 V peak repetitive reverse voltage, 500 mA forward current, and 4.0 ns reverse recovery time. It delivers low forward voltage (0.62 V at 5 mA) and low junction capacitance (4.0 pF at 0 V), making it suitable for high-speed digital logic clamping and waveform shaping in compact consumer and industrial PCBs.
For engineers reviewing the 1N4448WS-7-F datasheet, 1N4448WS-7-F pinout, 1N4448WS-7-F application, or 1N4448WS-7-F equivalent, key selection criteria include reverse recovery speed, thermal resistance (625 °C/W), cathode-band polarity marking, SOD323 footprint compatibility, and AEC-Q101-qualified variant availability (1N4448WSQ-7-F) for automotive designs.
Technical Context
This diode operates as a unidirectional, low-capacitance switching element with a PN junction optimized for rapid carrier recombination. Its 4.0 ns tRR enables use in >100 MHz clock line clamping and TTL/CMOS input protection circuits where minimal signal distortion is required.
Thermal performance is defined by 200 mW power dissipation on FR-4 with minimum pad layout and 625 °C/W junction-to-ambient resistance. The device maintains stable reverse leakage (<2.5 µA at 75 V, 25 °C) and forward conduction across –55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Package | SOD323: 1.30 mm × 1.70 mm footprint, 0.30 mm height, compatible with standard 0201-class pick-and-place and reflow profiles. |
| VRWM | 75 V: Maximum continuous reverse working voltage before significant leakage or breakdown; supports 5 V–24 V rail clamping. |
| tRR | 4.0 ns: Measured at IF = IR = 10 mA, RL = 100 Ω; ensures minimal switching tail in pulse-shaping applications. |
| CT | 4.0 pF at 0 V, 1 MHz: Low junction capacitance preserves signal edge integrity in RF detector and high-speed data line protection. |
| VF | 0.62 V at 5 mA: Low forward drop reduces power loss and self-heating in battery-powered sensor interface circuits. |
| RθJA | 625 °C/W: Thermal resistance measured on FR-4 with minimum recommended copper pads; dictates derating above 25 °C ambient. |
Pinout & Package
SOD323 is a two-terminal surface-mount package with molded plastic body, cathode band marking on one end, and matte tin-plated alloy 42 leadframe. Dimensions: D = 1.30 mm (length), E = 1.70 mm (width), He = 2.50 mm (height), L = 0.30 mm (lead length).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node during conduction; requires trace routing to minimize inductance in high-dI/dt paths. |
| Cathode (marked with band) | Forward current exit / reverse blocking terminal | Connected to higher-potential node; band orientation must match PCB silkscreen for automated optical inspection (AOI) compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 4.0 ns reverse recovery time enables reliable operation in >100 MHz digital signal conditioning without ringing. |
| Low forward voltage | 0.62 V at 5 mA reduces conduction loss in low-voltage logic-level translation and level-shifting interfaces. |
| Small SOD323 footprint | 1.3 mm × 1.7 mm area saves board space in dense portable electronics and multi-channel sensor modules. |
| Lead-free & halogen-free | Complies with RoHS 3 (2015/863/EU) and "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb); supports eco-design certification. |
Applications
| USB Data Line Protection | Microcontroller GPIO Clamping |
|---|---|
Use Scenario: Protecting USB 2.0 D+/D− lines from ESD transients and overvoltage coupling during hot-plug events. IC Role / Device Role: Bidirectional transient voltage clamp placed between data line and ground, leveraging low CT and fast tRR. Use Value: 4.0 pF capacitance avoids signal integrity degradation at 480 Mbps; 75 V VRWM withstands common-mode surges up to ±15 V. |
Use Scenario: Preventing latch-up and damage to 3.3 V microcontroller I/O pins exposed to external sensors or switches. IC Role / Device Role: Forward-biased clamp diode from I/O pin to VCC, reverse-biased clamp to GND. Use Value: 0.62 V forward drop ensures clamping begins near 3.9 V, staying within absolute maximum ratings of modern ARM Cortex-M MCUs. |
| High-Speed Logic Level Shifting | RF Detector Circuit |
Use Scenario: Translating 5 V TTL signals to 3.3 V CMOS inputs in mixed-voltage FPGA or ASIC interconnects. IC Role / Device Role: Passive series diode with pull-up resistor, exploiting low VF and fast turn-off. Use Value: 4.0 ns tRR prevents false triggering at 50+ MHz clock rates; SOD323 allows placement adjacent to BGA packages. |
Use Scenario: Demodulating AM signals in sub-GHz ISM band receivers (e.g., 315 MHz/433 MHz remote controls). IC Role / Device Role: Signal rectifier in envelope detector topology with parallel RC load. Use Value: 4.0 pF CT minimizes RF shunting loss; low VF improves sensitivity for weak-signal detection below –20 dBm. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148WS-7-F | Higher VRWM (100 V), identical tRR (4 ns), slightly higher VF (0.72 V @ 10 mA) | Better suited for 48 V industrial control inputs; less optimal for low-voltage logic clamping due to higher forward drop | Select when higher reverse voltage margin is required and 0.1 V higher VF is acceptable. |
| BAT54C-7-F | Lower VRWM (30 V), Schottky structure, faster tRR (<2 ns), higher leakage (≤2 µA @ 25 V) | Preferred for ultra-low-VF (<0.33 V) 3.3 V/5 V rail-to-rail clamping; unsuitable for >30 V reverse bias | Choose for lowest forward loss in battery-sensitive applications; avoid where 75 V reverse standoff is mandatory. |
Compared with 1N4148WS-7-F and BAT54C-7-F, the 1N4448WS-7-F offers the best balance of 75 V reverse rating, 4 ns speed, and 0.62 V forward drop - making it the preferred choice for general-purpose 3.3 V–24 V digital interface protection where moderate voltage headroom and predictable leakage are critical.
Availability
1N4448WS-7-F is available at Aetrix Electronics and suitable for USB interface protection, microcontroller I/O clamping, high-speed logic level shifting, and RF detector circuits requiring stable component supply and consistent SOD323 assembly performance.
Supply support for 1N4448WS-7-F 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, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The 1N4448WS belongs to Diodes' general-purpose fast-switching diode product line, engineered for high-volume, space-constrained applications demanding reliability, speed, and RoHS-compliant packaging in consumer, computing, and industrial electronics.
FAQ
Is the 1N4448WS-7-F AEC-Q101 qualified?
No - the 1N4448WS-7-F is not AEC-Q101 qualified. However, its automotive-grade counterpart, 1N4448WSQ-7-F, is fully AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. Both share identical electrical specifications and SOD323 packaging, differing only in process control and traceability documentation.
What is the maximum allowable soldering temperature for 1N4448WS-7-F?
The 1N4448WS-7-F is rated for moisture sensitivity level 1 per J-STD-020 and supports standard lead-free reflow profiles. Peak soldering temperature must not exceed 260 °C for ≤10 seconds, with ramp rates compliant with IPC/JEDEC J-STD-020. Preconditioning is not required due to MSL-1 classification.
Can 1N4448WS-7-F replace 1N4148 in existing designs?
Yes - the 1N4448WS-7-F is a direct SOD323 drop-in replacement for 1N4148 in surface-mount designs, offering identical 4 ns tRR, comparable VF, and improved thermal resistance (625 °C/W vs. ~700 °C/W for DO-35). No layout change is needed, but verify reverse voltage requirements: 1N4448WS has 75 V VRWM, while 1N4148 is rated at 100 V.
Does the 1N4448WS-7-F have a specified junction-to-case thermal resistance?
No - the datasheet specifies only junction-to-ambient thermal resistance (RθJA = 625 °C/W) under defined FR-4 board conditions. Junction-to-case (RθJC) is not characterized or guaranteed for this SOD323 discrete diode, as thermal path is dominated by PCB copper spread rather than case interface.
1N4448WS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io):
- 500mA
- 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:
- 2.5 µA @ 75 V
- Capacitance @ Vr, F:
- 4pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N4448WS-7-F FAQ
1.How can I place an order for 1N4448WS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4448WS-7-F 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 1N4448WS-7-F reliable?
The price and inventory of 1N4448WS-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4448WS-7-F is usually 5 days.
3.What payment methods are accepted for 1N4448WS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4448WS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4448WS-7-F?
1N4448WS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4448WS-7-F 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 1N4448WS-7-F?
For technical support, including 1N4448WS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4448WS-7-F requirements.
6.How does Aetrix verify that 1N4448WS-7-F is sourced from the original manufacturer or authorized distributors?
All 1N4448WS-7-F 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 1N4448WS-7-F meets industry standards.
7.What is the process for return or replacement of 1N4448WS-7-F?
All 1N4448WS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with 1N4448WS-7-F, 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 1N4448WS-7-F part is unused and in its original packaging.
Return procedure for 1N4448WS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4448WS-7-F Tags
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