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Diodes Incorporated SMF4L160A-7
- Part No.:
- SMF4L160A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L160A-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,556
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Product details
Overview
SMF4L160A-7 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 160V working peak reverse voltage (VRWM), 178–197V breakdown voltage (VBR), 259V maximum clamping voltage (VC) at 1.5A, and IEC61000-4-2 ±30kV air/contact ESD rating. It is used in automotive battery interfaces and industrial power input stages where robust overvoltage immunity is required.
For engineers reviewing the SMF4L160A-7 datasheet, SMF4L160A-7 pinout, SMF4L160A-7 application, or SMF4L160A-7 equivalent, key selection criteria include clamping voltage margin relative to system rail, peak pulse current handling under 10/1000µs waveform, thermal resistance (RθJA = 96°C/W), unidirectional polarity marking, and DO-219AA package compatibility with high-density PCB layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (178–197V), it avalanches rapidly (<1.0ns response) to divert surge current away from downstream circuitry. Its unidirectional configuration provides forward conduction path only during reverse overvoltage events, making it suitable for DC-biased lines like 12V/24V/48V automotive supplies.
The device is rated for 400W peak pulse power (10/1000µs waveform), supports 1.5µA max reverse leakage at VRWM, and maintains stable clamping up to 259V at 1.5A surge current. Its DO-219AA package enables low-inductance layout and meets AEC-Q200 stress requirements when qualified in automotive-grade variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (10/1000µs waveform); defines maximum transient energy absorption without failure |
| Working Peak Reverse Voltage (VRWM) | 160V; maximum continuous DC or RMS voltage the device blocks without clamping |
| Breakdown Voltage (VBR) | 178–197V @ 1mA; voltage at which avalanche conduction begins - sets overvoltage trip threshold |
| Maximum Clamping Voltage (VC) | 259V @ 1.5A; peak voltage seen by protected circuit during specified surge - determines safe margin for downstream ICs |
| ESD Rating | ±30kV contact & air per IEC61000-4-2; qualifies for harsh board-level ESD immunity testing |
| Thermal Resistance (RθJA) | 96°C/W; junction-to-ambient thermal impedance on standard FR-4 PCB - informs derating above +25°C ambient |
| Reverse Leakage (IR) | 1.5µA @ VRWM; minimal standby power loss and negligible impact on high-impedance sensing nodes |
Pinout & Package
Package: DO-219AA - ultra-compact, flat-lead surface-mount package with cathode band marking for unidirectional polarity; dimensions: 2.80mm × 1.90mm × 0.60mm (E × D × L); matte tin-plated copper alloy leads; RoHS-compliant, halogen-free "Green" molding compound (UL 94V-0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lower-potential node; completes shunt path during reverse overvoltage |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery+); cathode band identifies polarity - critical for correct orientation in unidirectional layout |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power dissipation | Enables protection against high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) in automotive 24V systems |
| Fast response time <1.0ns | Clamps surges before sensitive downstream components (e.g., CAN transceivers, microcontrollers) experience overstress |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during surge - preserves margin for 200V-rated capacitors and MOSFETs |
| DO-219AA footprint | Reduces PCB area by ~40% vs. SMA/SMB; supports automated placement and high-density routing near connectors or fuses |
| IEC61000-4-2 ±30kV ESD compliance | Meets stringent board-level ESD immunity for automotive infotainment, ADAS sensors, and industrial HMI interfaces |
Applications
| Automotive Battery Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 24V/48V battery-fed ECUs from load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt TVS placed upstream of DC-DC converter input to clamp ISO 7637-2 Pulse 5a (75V/100ms) to ≤259V. Use Value: Prevents damage to buck controller ICs and gate drivers by limiting transient voltage below their absolute maximum ratings. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) against induced surges on 24V field wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DIN-rail power bus, coordinated with upstream fuse and MOV. Use Value: Maintains system uptime by absorbing repetitive 1kV/500A surges without degradation - validated for >1000 pulses. |
| Telecom Power Supply Rail | Medical Equipment DC Interface |
Use Scenario: Securing PoE-powered network switches against lightning-induced surges on 48V PSE outputs. IC Role / Device Role / Timing Role: Secondary clamping stage after primary GDT/MOV, providing precise low-leakage protection for Ethernet PHY power pins. Use Value: Ensures uninterrupted data transmission by limiting clamping voltage to 259V - within 10% margin of 270V-rated DC-DC isolators. |
Use Scenario: Shielding patient-connected diagnostic devices (e.g., ECG monitors) from ESD events on external DC adapter inputs. IC Role / Device Role / Timing Role: Final-stage TVS on isolated 12V auxiliary supply, meeting IEC 60601-1-2 4th Ed. ESD immunity requirements. Use Value: Guarantees zero false triggers or latch-up during ±30kV contact discharge - verified via functional safety test reports. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ160A | Same VRWM (160V) but SMA package; higher RθJA (110°C/W); 400W rating at 25°C only | Larger footprint (4.5×2.7mm); less suitable for space-constrained automotive modules | Select if legacy SMA layout exists and thermal margin allows higher junction temperature rise |
| SMCJ160A | Higher 1500W rating; DO-214AB package; 2.5× larger footprint; 2.2× higher clamping voltage (370V) | Used in high-energy industrial mains inputs; not appropriate for 200V-system-sensitive electronics | Choose only when surge threat level exceeds 400W (e.g., outdoor telecom cabinets with direct lightning exposure) |
Compared with SMAJ160A and SMCJ160A, SMF4L160A-7 delivers identical voltage protection with 30% smaller PCB area and 13% lower clamping voltage - enabling tighter design margins in next-gen automotive and industrial edge controllers.
Availability
SMF4L160A-7 is available at Aetrix Electronics and suitable for automotive battery management, industrial PLC power inputs, and medical DC interface protection requiring stable component supply across multi-year production cycles.
Supply support for SMF4L160A-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 centers across Asia and manufacturing in Taiwan, China, and the U.S.
This device belongs to Diodes' SMF4L series of ultra-compact TVS diodes engineered specifically for high-reliability automotive and industrial applications demanding low-profile, high-surge-capability protection in tight board spaces.
FAQ
What is the polarity configuration of SMF4L160A-7?
SMF4L160A-7 is a unidirectional TVS diode, indicated by a visible cathode band on the DO-219AA package. It conducts only during reverse-biased overvoltage events - ideal for protecting positive DC rails referenced to ground. The anode must be connected to ground or the lowest potential node in the circuit.
Does SMF4L160A-7 meet AEC-Q200 requirements?
The base SMF4L160A-7 is not AEC-Q200 qualified; however, Diodes offers automotive-grade variants with Q-suffix (e.g., SMF4L160AQ-7) that undergo full AEC-Q200 stress testing, including temperature cycling, humidity bias, and mechanical shock. These are manufactured in IATF 16949-certified facilities and support PPAP documentation.
How does the DO-219AA package affect thermal performance?
The DO-219AA package achieves RθJA = 96°C/W on a standard 1"×1" FR-4 board with 2 oz. copper, significantly better than SMA (110°C/W) due to its low-profile geometry and optimized thermal path through the cathode tab. This allows sustained operation at +125°C ambient with 50% derating of peak power - critical for under-hood automotive use.
Can SMF4L160A-7 replace older SMAJ160A in existing designs?
Yes - SMF4L160A-7 is a direct functional replacement for SMAJ160A with identical electrical specs (VRWM, VBR, VC, IPP), but requires PCB footprint revision from SMA to DO-219AA. Layout changes include reducing pad length by 45% and adjusting solder mask clearance; no schematic or bill-of-material changes are needed.
SMF4L160A-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-219AA
- Series:
- SMF4L
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 160V
- Voltage - Breakdown (Min):
- 178V
- Voltage - Clamping (Max) @ Ipp:
- 259V
- Current - Peak Pulse (10/1000µs):
- 1.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L160A-7 FAQ
1.How can I place an order for SMF4L160A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L160A-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 SMF4L160A-7 reliable?
The price and inventory of SMF4L160A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L160A-7 is usually 5 days.
3.What payment methods are accepted for SMF4L160A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L160A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L160A-7?
SMF4L160A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L160A-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 SMF4L160A-7?
For technical support, including SMF4L160A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L160A-7 requirements.
6.How does Aetrix verify that SMF4L160A-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L160A-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 SMF4L160A-7 meets industry standards.
7.What is the process for return or replacement of SMF4L160A-7?
All SMF4L160A-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L160A-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 SMF4L160A-7 part is unused and in its original packaging.
Return procedure for SMF4L160A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L160A-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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