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Diodes Incorporated 1N4148WT-7
- Part No.:
- 1N4148WT-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
1N4148WT-7.pdf
- Description:
- DIODE GEN PURP 80V 125MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:41,631
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Product details
Overview
1N4148WT-7 from Diodes Incorporated is a surface-mount fast-switching silicon signal diode in SOD523 package, rated for 100 V non-repetitive peak reverse voltage, 250 mA forward current, and 4.0 ns reverse recovery time. It delivers high conductance with VF = 0.715 V at IF = 1.0 mA and is widely used in high-speed logic clamping, waveform shaping, and general-purpose switching in compact consumer and industrial PCBs.
For engineers reviewing the 1N4148WT-7 datasheet, 1N4148WT-7 pinout, 1N4148WT-7 application, or 1N4148WT-7 equivalent, key selection criteria include its ultra-small SOD523 footprint, 833 °C/W thermal resistance, 2.0 pF junction capacitance at 0 V, AEC-Q101-qualified variant (1N4148WTQ), and compatibility with automated SMT assembly under J-STD-020 Level 1 moisture sensitivity.
Technical Context
The 1N4148WT-7 implements a planar epitaxial silicon PN junction optimized for rapid carrier recombination, enabling sub-5 ns reverse recovery. Its low stored charge and shallow junction depth support operation up to 100 MHz in clipping and sampling circuits.
Designed for surface-mount reliability, it uses matte tin–annealed Alloy 42 leads and green molding compound (UL 94V-0), with cathode band polarity marking and 0.0014 g mass - critical for high-density portable electronics where board space and thermal mass are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM | 100 V - supports transient suppression in 48 V rail interfaces without breakdown |
| tRR | 4.0 ns - enables clean edge transitions in >25 MHz digital signal routing |
| VF @ 1 mA | 0.715 V - minimizes voltage drop in low-current bias networks and level-shifting paths |
| CT @ 0 V | 2.0 pF - limits capacitive loading on high-impedance nodes like oscillator feedback paths |
| RθJA | 833 °C/W - requires minimal copper area for thermal management in FR-4 layouts |
| IFSM | 2.0 A @ 1 μs - withstands ESD-induced surge events in I/O protection circuits |
| Moisture Sensitivity | Level 1 per J-STD-020 - zero bake requirement before reflow, simplifying manufacturing flow |
Pinout & Package
Package: SOD523 - ultra-compact 1.25 mm × 0.85 mm × 0.65 mm surface-mount outline with cathode band marking on top surface; terminals are matte tin–annealed Alloy 42 leads, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward current entry | Connected to lower-potential node in clamping or steering configurations |
| 2 (Cathode) | Forward current exit / Reverse blocking terminal | Marked by visible band; ties to higher-potential or ground-referenced node for protection |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 4.0 ns tRR enables use in >25 MHz clock line conditioning and pulse shaping |
| Ultra-small SOD523 package | 1.25 mm × 0.85 mm footprint saves >60% board area vs. SOD-123 in dense layout designs |
| High conductance | Low VF (0.715 V @ 1 mA) reduces power loss in low-duty-cycle bias networks |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; no added lead, antimony, or halogens |
| Junction capacitance ≤2.0 pF | Minimizes signal distortion in RF detector and high-frequency sampling applications |
Applications
| Logic Signal Clamping | Digital Input Protection |
|---|---|
Use Scenario: Preventing overvoltage on microcontroller GPIO pins during hot-plug or ESD events. IC Role / Device Role: Fast-acting shunt clamp that conducts above VCC + 0.7 V, diverting transients to rail. Use Value: 4.0 ns tRR ensures clamping engages before logic threshold violation; 2.0 pF CT avoids signal integrity degradation on 50 MHz data lines. | Use Scenario: Isolating legacy TTL outputs driving CMOS inputs with mismatched voltage thresholds. IC Role / Device Role: Level translator and current-limiting series diode in bidirectional bus interface. Use Value: 0.715 V VF at 1 mA provides predictable offset; SOD523 size allows placement directly at connector pads. |
| Waveform Shaping | High-Speed Sampling Gate |
Use Scenario: Trimming peaks in analog sensor output prior to ADC input to prevent saturation. IC Role / Device Role: Precision clipper using forward conduction to limit positive excursions. Use Value: Tight VF tolerance (±0.07 V at 1 mA) ensures repeatable clipping level across temperature. | Use Scenario: Gating sample pulses in switched-capacitor ADC front-ends operating at 10 MSPS. IC Role / Device Role: Low-capacitance, low-charge-injection switch controlling hold capacitor connection. Use Value: 2.0 pF CT and <1 nC stored charge minimize sampling error and settling time. |
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 (Diodes Inc.) | SOD-323 package (1.7 mm × 1.25 mm); 500 mW PD; RθJA = 400 °C/W | Larger footprint but higher power handling; better thermal performance in moderate-current apps | Select when >150 mA average current or >100 mW dissipation is expected |
| BAT54C-7-F (Diodes Inc.) | Dual common-cathode Schottky; VF = 0.33 V @ 10 mA; tRR not specified (inherently faster) | Lower VF improves efficiency in low-voltage biasing; dual configuration saves space in paired functions | Select for <3.3 V systems requiring minimal forward drop or dual-diode topology |
Compared with 1N4148W-7 and BAT54C-7-F, the 1N4148WT-7 uniquely balances ultra-miniaturization (SOD523), predictable 4.0 ns switching, and robust 100 V VRM - making it optimal for space-constrained, high-frequency signal routing where thermal load is light and silicon junction behavior is preferred over Schottky leakage trade-offs.
Availability
1N4148WT-7 is available at Aetrix Electronics and suitable for high-density consumer electronics, portable medical sensors, and industrial IoT edge nodes requiring stable component supply, consistent SMT placement yield, and long-term obsolescence resilience.
Supply support for 1N4148WT-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, specializing in high-reliability, industry-standard components for power management, signal integrity, and protection.
The 1N4148WT belongs to Diodes' legacy fast-switching diode product line, engineered specifically for miniaturized, high-speed signal routing in cost-sensitive, high-volume applications - emphasizing manufacturability, JEDEC-compliant packaging, and broad qualification coverage.
FAQ
What is the maximum continuous forward current rating for the 1N4148WT-7?
The 1N4148WT-7 is rated for 250 mA non-repetitive peak forward current and 125 mA average rectified output current. Its 150 mW power dissipation limit and 833 °C/W thermal resistance mean sustained 125 mA operation requires careful PCB copper area design to avoid exceeding the -55°C to +150°C junction temperature range.
Is the 1N4148WT-7 suitable for automotive applications?
The standard 1N4148WT-7 is not AEC-Q101 qualified. However, the functionally identical 1N4148WTQ-7 variant is fully AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities - making it the approved choice for automotive infotainment, body control, and ADAS subsystems requiring change-controlled components.
How does the SOD523 package affect PCB layout and reflow compatibility?
The SOD523 package (1.25 mm × 0.85 mm) requires precise stencil aperture design and alignment for reliable solder paste deposition. Its J-STD-020 Level 1 moisture sensitivity eliminates bake requirements, and its matte tin–annealed leads ensure compatibility with standard SnPb and lead-free reflow profiles without dewetting or voiding when using recommended pad dimensions (G = 0.80 mm, X = 0.60 mm).
What is the typical reverse recovery time and how is it measured?
The 1N4148WT-7 has a typical reverse recovery time (tRR) of 4.0 ns, measured under standardized conditions: IF = IR = 10 mA, IRR = 0.1 × IR, RL = 100 Ω. This value reflects the time required for minority carriers to clear the junction after forward conduction, directly impacting performance in high-frequency switching and pulse edge fidelity.
1N4148WT-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 80 V
- Current - Average Rectified (Io):
- 125mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 50 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 75 V
- Capacitance @ Vr, F:
- 2pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N4148WT-7 FAQ
1.How can I place an order for 1N4148WT-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4148WT-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 1N4148WT-7 reliable?
The price and inventory of 1N4148WT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4148WT-7 is usually 5 days.
3.What payment methods are accepted for 1N4148WT-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4148WT-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4148WT-7?
1N4148WT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4148WT-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 1N4148WT-7?
For technical support, including 1N4148WT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4148WT-7 requirements.
6.How does Aetrix verify that 1N4148WT-7 is sourced from the original manufacturer or authorized distributors?
All 1N4148WT-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 1N4148WT-7 meets industry standards.
7.What is the process for return or replacement of 1N4148WT-7?
All 1N4148WT-7 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4148WT-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 1N4148WT-7 part is unused and in its original packaging.
Return procedure for 1N4148WT-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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