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Vishay General Semiconductor - Diodes Division VTVS21ASMF-M3-18
- Part No.:
- VTVS21ASMF-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS21ASMF-M3-18.pdf
- Description:
- TVS DIODE 20.5VWM 34VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,953
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Product details
Overview
VTVS21ASMF-M3-18 from Vishay Semiconductors is a unidirectional 400 W TransZorb® transient voltage suppressor diode in SMF (DO-219AB) package, designed for ESD and surge protection of low-voltage DC lines. It features a 20.5 V stand-off voltage (VRWM), 23.0–25.4 V reverse breakdown voltage (VBR at 1 mA), 34 V maximum clamping voltage (VC) at 11.33 A peak pulse current, and ±30 kV IEC 61000-4-2 ESD immunity - deployed in automotive infotainment power rails and USB Type-C port protection.
For engineers reviewing the VTVS21ASMF-M3-18 datasheet, VTVS21ASMF-M3-18 pinout, VTVS21ASMF-M3-18 application, or VTVS21ASMF-M3-18 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, thermal resistance (20 K/W), junction temperature range (−55 °C to +175 °C), and halogen-free, AEC-Q101-qualified construction for automotive-grade reliability.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VRWM (20.5 V), it avalanches into low-impedance conduction, limiting downstream voltage to ≤34 V at 11.33 A. Its 1.08 mm height and SOD-123W-compatible SMF package enables high-density PCB layout while maintaining 400 W peak pulse power handling per IEC 61000-4-5 (10/1000 μs).
The device achieves <1 ns response time via "Low-Noise" avalanche technology and delivers 2095 pF typical capacitance at 0 V bias - optimized for signal integrity in 24 V industrial control I/O lines and automotive body electronics where ESD robustness and minimal capacitive loading are jointly critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (per 10/1000 μs waveform; sustains repeated surges without degradation) |
| Stand-off Voltage (VRWM) | 20.5 V (maximum continuous reverse working voltage before leakage exceeds 0.05 μA) |
| Breakdown Voltage (VBR) | 23.0–25.4 V at 1 mA (tight ±5 % tolerance ensures predictable turn-on across temperature) |
| Clamping Voltage (VC) | 34 V at 11.33 A IPPM (limits protected circuit voltage during worst-case surge) |
| ESD Immunity | ±30 kV contact / ±30 kV air (IEC 61000-4-2 compliant; eliminates need for external ESD staging) |
| Junction Temperature Range | −55 °C to +175 °C (supports under-hood automotive and industrial environments) |
| Package | SMF (DO-219AB); footprint compatible with SOD-123W, SOD-123F, SOD-123FL |
Pinout & Package
SMF (DO-219AB) package: low-profile surface-mount case with cathode bar marking; dimensions 3.9 × 1.9 × 1.08 mm (L × W × H); compatible with wave and reflow soldering (peak temp ≤260 °C); MSL level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (1) | Transient current sink path | Connected to protected line; conducts surge current to ground when clamping activates |
| Cathode (2) | Reference node / ground return | Connected to system ground; defines polarity and establishes clamping threshold relative to ground |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables single-device protection against IEC 61000-4-5 Level 4 surges on 24 V systems |
| ±5 % VBR tolerance | Guarantees consistent clamping onset across production lots and temperature extremes |
| ±30 kV ESD rating | Meets automotive OEM requirements for connector-level ESD without additional shielding |
| 1.08 mm profile | Reduces board space by >30 % vs. SMA packages while maintaining thermal performance |
| AEC-Q101 qualified | Validated for automotive applications including infotainment, ADAS sensors, and body control modules |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Digital I/O Port |
|---|---|
Use Scenario: Protecting 24 V supply lines feeding head unit display controllers and audio amplifiers from load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS diode placed between VCC and GND, clamping overvoltage within 1 ns. Use Value: Limits voltage to ≤34 V during 11.33 A surge, preventing latch-up or burnout of downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to field wiring-induced surges. IC Role / Device Role / Timing Role: Standoff protector on each I/O line, operating continuously at 20.5 V with <0.05 μA leakage. Use Value: Maintains signal integrity with only 513 pF capacitance while surviving repeated 400 W pulses per IEC 61000-4-5. |
| USB Type-C VBUS Line Protection | Automotive Body Control Module (BCM) Sensor Interface |
Use Scenario: Clamping VBUS line against ESD events during hot-plug insertion of USB-C peripherals in vehicle docking stations. IC Role / Device Role / Timing Role: Primary ESD suppressor located adjacent to USB-C receptacle, grounded to chassis. Use Value: Withstands ±30 kV contact discharge without degradation, preserving USB 2.0/3.2 signal integrity. |
Use Scenario: Protecting LIN bus sensor inputs (e.g., ambient temperature, door lock actuators) from battery reverse polarity and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed between LIN line and ground, leveraging low leakage. Use Value: Operates reliably from −55 °C to +175 °C and meets AEC-Q101 stress test requirements for BCM longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/57T | Higher clamping voltage (35.5 V at 11.3 A); SMA package (2.5 mm height) | Less suitable for space-constrained automotive modules due to larger footprint and height | Select when legacy SMA layout exists and 1.5 V higher VC is acceptable |
| TPSMD22A | Same VRWM (22 V), but lower PPPM (300 W); 2000 pF capacitance | Lower surge margin may require derating in harsh industrial environments | Prefer for cost-sensitive consumer applications where 400 W headroom is unnecessary |
Compared with SMAJ22A-E3/57T and TPSMD22A, VTVS21ASMF-M3-18 delivers superior space efficiency (1.08 mm height), tighter VBR tolerance (±5 %), and higher surge endurance (400 W), making it optimal for next-generation automotive and industrial designs demanding AEC-Q101 compliance and minimal board area.
Availability
VTVS21ASMF-M3-18 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and USB-C docking station designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge protection.
Supply support for VTVS21ASMF-M3-18 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The VTVS eSMP® Series targets high-density, high-surge applications requiring AEC-Q101 qualification, low-profile packaging, and precise clamping - engineered specifically for modern automotive electronics and ruggedized industrial interfaces.
FAQ
What is the maximum clamping voltage of the VTVS21ASMF-M3-18 under a 10/1000 μs surge?
The VTVS21ASMF-M3-18 has a maximum reverse clamping voltage (VC) of 34 V at 11.33 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed across temperature and ensures downstream ICs remain within safe operating voltage limits during surge events. The VTVS21ASMF-M3-18 achieves this with low dynamic impedance and fast avalanche response.
Is the VTVS21ASMF-M3-18 AEC-Q101 qualified?
Yes, the VTVS21ASMF-M3-18 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and infotainment systems. This qualification covers stress tests for temperature cycling, humidity, mechanical shock, and ESD - all verified per the Vishay eSMP® Series automotive release protocol. The VTVS21ASMF-M3-18 carries full traceability and lot-level documentation.
What is the thermal resistance (RthJL) of the VTVS21ASMF-M3-18?
The VTVS21ASMF-M3-18 has a thermal resistance (RthJL) of 20 K/W when mounted on an infinite heat sink, enabling efficient heat dissipation during repetitive surge events. This value supports reliable operation up to +175 °C junction temperature and informs PCB copper pour design for thermal management. The VTVS21ASMF-M3-18's low RthJL is achieved through its SMF package's optimized leadframe geometry and direct die-to-lead thermal path.
Does the VTVS21ASMF-M3-18 meet halogen-free and RoHS requirements?
Yes, the VTVS21ASMF-M3-18 is halogen-free and RoHS-compliant, with lead (Pb)-free terminations plated with matte tin. Its molding compound is UL 94 V-0 rated and conforms to Vishay's material categorization standard (document 99912). These compliance attributes are confirmed in the official Vishay datasheet revision 2.2 and supported by full substance declaration reports for the VTVS21ASMF-M3-18.
What is the typical junction capacitance of the VTVS21ASMF-M3-18 at 0 V bias?
The VTVS21ASMF-M3-18 exhibits a typical junction capacitance (CD) of 513 pF at 0 V reverse bias and 1 MHz frequency. This value is measured per the manufacturer's test conditions and reflects the device's trade-off between surge capability and signal-line loading - appropriate for 24 V power rail and low-speed data line protection. The VTVS21ASMF-M3-18's capacitance remains stable across VRWM, supporting predictable filtering behavior.
VTVS21ASMF-M3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20.5V
- Voltage - Breakdown (Min):
- 23V
- Voltage - Clamping (Max) @ Ipp:
- 34V
- Current - Peak Pulse (10/1000µs):
- 11.33A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 513pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS21ASMF-M3-18 FAQ
1.How can I place an order for VTVS21ASMF-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS21ASMF-M3-18 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 VTVS21ASMF-M3-18 reliable?
The price and inventory of VTVS21ASMF-M3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VTVS21ASMF-M3-18 is usually 5 days.
3.What payment methods are accepted for VTVS21ASMF-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS21ASMF-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS21ASMF-M3-18?
VTVS21ASMF-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS21ASMF-M3-18 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 VTVS21ASMF-M3-18?
For technical support, including VTVS21ASMF-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS21ASMF-M3-18 requirements.
6.How does Aetrix verify that VTVS21ASMF-M3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS21ASMF-M3-18 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 VTVS21ASMF-M3-18 meets industry standards.
7.What is the process for return or replacement of VTVS21ASMF-M3-18?
All VTVS21ASMF-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS21ASMF-M3-18, 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 VTVS21ASMF-M3-18 part is unused and in its original packaging.
Return procedure for VTVS21ASMF-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS21ASMF-M3-18 Tags
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