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Diodes Incorporated D18AP2WF-7
- Part No.:
- D18AP2WF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
D18AP2WF-7.pdf
- Description:
- SURGE PROTECTION PP SOD123F T&R
- Quantity:
- Payment:
- Shipping:
Inventory:6,319
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Product details
Overview
D18AP2WF-7 from Diodes Incorporated is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for clamping fast-rising ESD and surge transients on power rails and battery contacts. It features a 18V reverse standoff voltage, 20V minimum breakdown voltage, 29.2V maximum clamping voltage at 7.71A peak pulse current, and 225W peak pulse power dissipation (10/1000µs waveform), enabling robust protection in portable power management systems.
For engineers reviewing the D18AP2WF-7 datasheet, D18AP2WF-7 pinout, D18AP2WF-7 application, or D18AP2WF-7 equivalent, key selection criteria include its SOD123F package footprint, cathode-bar polarity marking, IEC 61000-4-2 ±30kV contact/air ESD rating, thermal resistance of 70°C/W (junction-to-solder point), and derating behavior above +25°C ambient.
Technical Context
This TVS operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR (20–22.1V). Its low RθJS (70°C/W) enables effective heat transfer to the PCB solder joint under transient stress.
The device sustains 7.71A peak pulse current (IPP) while limiting voltage to ≤29.2V (VC), delivering 225W peak power handling per the 10/1000µs standard waveform. It exhibits <1µA reverse leakage at 18V (VRWM) and is rated for operation from –55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 18V - Maximum continuous reverse operating voltage before significant leakage begins. |
| VBR (min) | 20.0V @ 1mA - Minimum voltage at which avalanche breakdown initiates reliably. |
| VC (max) | 29.2V @ 7.71A - Maximum clamped voltage during worst-case 10/1000µs surge, defining protection level. |
| PPK | 225W (10/1000µs) - Peak transient energy absorption capability without failure. |
| ESD Rating | ±30kV (IEC 61000-4-2, contact & air) - Full-system ESD immunity without external shielding. |
| RθJS | 70°C/W - Thermal resistance from junction to solder point, critical for PCB layout thermal design. |
| Package | SOD123F - Compact 2-pin surface-mount outline with cathode bar marking and 0.018g mass. |
Pinout & Package
Package: SOD123F - molded plastic case (UL 94V-0), matte tin-plated copper alloy leadframe, moisture sensitivity level 1 (J-STD-020), cathode identified by a bar marking on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to lower-potential side of protected line. | Must be tied to ground or return path in unidirectional TVS configuration for proper clamping. |
| Cathode | Current exit terminal during reverse avalanche; connected to protected line (e.g., battery+, VIN). | Bar-marked side; determines orientation during automated placement and ensures correct polarity in surge path. |
Key Features
| Feature | Design Value |
|---|---|
| Peak Pulse Power | 225W (10/1000µs) - Enables single-device protection against IEC 61000-4-5 Level 3 surges (1A/2Ω) on 12–24V rails. |
| Clamping Ratio (VC/VBR) | ≤1.46 - Low ratio ensures minimal overvoltage exposure to downstream ICs during transient events. |
| ESD Robustness | ±30kV contact/air (IEC 61000-4-2) - Eliminates need for additional ESD stages in handheld battery interface designs. |
| Thermal Performance | RθJS = 70°C/W - Allows direct thermal coupling to copper pour, supporting high-reliability automotive and industrial deployments. |
| Environmental Compliance | RoHS 3, Halogen- & Antimony-Free ("Green") - Meets IPC-1752A material declaration requirements for global OEM programs. |
Applications
| Battery Protection Circuit | USB Power Input Stage |
|---|---|
|
Use Scenario: Protecting lithium-ion battery terminals from ESD during hot-plug insertion and mechanical contact bounce. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery+ and chassis ground, activated within nanoseconds of overvoltage onset. Use Value: Prevents gate oxide damage to fuel gauge ICs and battery protection MOSFETs by limiting transients to ≤29.2V at 7.71A. |
Use Scenario: Safeguarding 5V USB VBUS lines against ESD from user cables and connector mating cycles. IC Role / Device Role / Timing Role: Standoff-rated TVS shunting surge energy away from USB controller and PMIC input pins. Use Value: Maintains system uptime by absorbing ±30kV contact discharges without latch-up or parametric shift in downstream regulators. |
| Industrial Sensor Power Rail | Automotive Body Control Module (BCM) Input |
|
Use Scenario: Securing 12V supply inputs to temperature/humidity sensors exposed to cable-induced surges in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage clamp on sensor module's main power entry point, coordinated with upstream fuse. Use Value: Withstands repeated 225W pulses without degradation, ensuring >10-year field reliability in unattended equipment. |
Use Scenario: Protecting BCM microcontroller supply inputs from load-dump and jump-start transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Secondary clamping stage after primary TVS or varistor, optimized for fast response and low clamping voltage. Use Value: Limits clamped voltage to 29.2V-well below typical 36V MCU absolute maximum ratings-reducing need for oversized input capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-13-F (Diodes Inc.) | Same VRWM (18V), but SMA package (larger, RθJA = 50°C/W), 400W PPK, higher VC = 32.4V. | Used where board space allows larger footprint and higher surge margin is prioritized over clamping tightness. | Select when system-level surge testing requires >300W headroom and thermal mass from larger pad layout is available. |
| 1.5SMC18A (ON Semiconductor) | Same VRWM, but SMC package (5.3mm × 4.5mm), 1500W PPK, VC = 29.2V, higher IPP = 51.3A. | Deployed in high-energy industrial mains interfaces where physical size is secondary to energy absorption. | Choose only if PCB real estate permits SMC outline and application demands multi-kA surge handling beyond automotive ISO 7637-2. |
Compared with SMAJ18A-13-F and 1.5SMC18A, D18AP2WF-7 delivers superior clamping precision (same VC as the larger 1.5SMC18A but in 60% smaller area) and optimal thermal coupling for compact battery-powered designs, though with lower absolute surge energy capacity.
Availability
D18AP2WF-7 is available at Aetrix Electronics and suitable for battery management systems, USB-C power delivery interfaces, and industrial sensor modules requiring stable component supply with full RoHS 3 and "Green" compliance.
Supply support for D18AP2WF-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, with design, manufacturing, and sales operations across Asia, Europe, and North America.
D18AP2WF-7 belongs to Diodes' AP-series TVS portfolio, engineered specifically for space-constrained, high-reliability DC power rail protection in portable and automotive-qualified applications.
FAQ
What is the polarity configuration of D18AP2WF-7?
D18AP2WF-7 is a unidirectional TVS diode with cathode-bar marking on the top surface. The cathode must connect to the protected line (e.g., battery+ or VBUS), and the anode to ground. This configuration provides precise clamping above VBR while blocking normal forward current.
Can D18AP2WF-7 be used in automotive applications?
D18AP2WF-7 meets AEC-Q200 stress test requirements for passive components and operates from –55°C to +150°C. While not AEC-Q101 qualified as a discrete diode, it is widely deployed in non-safety-critical automotive body electronics when paired with appropriate system-level validation per ISO 16750-2.
How does the SOD123F package affect thermal performance?
The SOD123F package enables low RθJS (70°C/W) due to direct thermal path from die to cathode tab and solder joint. Unlike larger packages, its small footprint requires careful copper pour design-minimum 25 mm² of 2-oz copper connected to cathode-to sustain repetitive 225W pulses without exceeding TJ = 150°C.
Is D18AP2WF-7 compatible with lead-free reflow processes?
Yes-D18AP2WF-7 features a matte tin finish over copper alloy leadframe and is rated for standard JEDEC J-STD-020 moisture sensitivity level 1. It withstands peak reflow temperatures up to 260°C and complies with IPC/JEDEC G-100 guidelines for lead-free assembly without delamination or solder joint voiding.
D18AP2WF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SOD-123F
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 7.71A
- Power - Peak Pulse:
- 225W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
D18AP2WF-7 FAQ
1.How can I place an order for D18AP2WF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for D18AP2WF-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 D18AP2WF-7 reliable?
The price and inventory of D18AP2WF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D18AP2WF-7 is usually 5 days.
3.What payment methods are accepted for D18AP2WF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D18AP2WF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for D18AP2WF-7?
D18AP2WF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your D18AP2WF-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 D18AP2WF-7?
For technical support, including D18AP2WF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D18AP2WF-7 requirements.
6.How does Aetrix verify that D18AP2WF-7 is sourced from the original manufacturer or authorized distributors?
All D18AP2WF-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 D18AP2WF-7 meets industry standards.
7.What is the process for return or replacement of D18AP2WF-7?
All D18AP2WF-7 units undergo pre-shipment inspection (PSI). If there is an issue with D18AP2WF-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 D18AP2WF-7 part is unused and in its original packaging.
Return procedure for D18AP2WF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
D18AP2WF-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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