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Vishay General Semiconductor - Diodes Division VTVS21ASMF-M3-08
- Part No.:
- VTVS21ASMF-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS21ASMF-M3-08.pdf
- Description:
- TVS DIODE 20.5VWM 34VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:29,857
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Product details
Overview
VTVS21ASMF-M3-08 from Vishay Semiconductors is a unidirectional 400 W TransZorb® transient voltage suppressor diode in SMF (DO-219AB) package, with 20.5 V stand-off voltage (VRWM), 23.0–25.4 V reverse breakdown voltage (VBR at IT = 1 mA), and 34 V maximum clamping voltage (VC) at 11.33 A peak pulse current (10/1000 μs). It delivers ±30 kV ESD protection per IEC 61000-4-2 and operates from –55 °C to +175 °C for automotive power rail and interface line surge suppression.
For engineers reviewing the VTVS21ASMF-M3-08 datasheet, VTVS21ASMF-M3-08 pinout, VTVS21ASMF-M3-08 application, or VTVS21ASMF-M3-08 equivalent, this device serves as a low-capacitance (513 pF), AEC-Q101-qualified TVS for high-reliability 24 V system inputs, USB Type-C VBUS lines, and industrial sensor interfaces requiring fast clamping response and robust 400 W surge handling.
Technical Context
This unidirectional TVS diode uses silicon avalanche junction technology to clamp transients above its breakdown threshold while maintaining low leakage (<0.05 μA at VRWM) and stable thermal performance up to 175 °C junction temperature. Its DO-219AB package enables surface-mount reflow compatibility with peak solder temperatures up to 260 °C and MSL Level 1 moisture sensitivity rating.
The device exhibits 20 K/W thermal resistance (junction-to-lead, mounted on infinite heat sink) and achieves 34 V clamping at 11.33 A IPPM under standardized 10/1000 μs waveform conditions - enabling predictable overvoltage protection in 24 V nominal systems where sustained clamping below 35 V is critical for downstream IC survival.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform; defines maximum transient energy absorption without failure) |
| Stand-off Voltage (VRWM) | 20.5 V (maximum continuous reverse voltage before significant leakage; sets operating margin for 24 V rails) |
| Breakdown Voltage (VBR) | 23.0–25.4 V at IT = 1 mA (avalanche onset range; ensures reliable triggering above normal operating voltage) |
| Clamping Voltage (VC) | 34 V at IPPM = 11.33 A (maximum voltage seen by protected circuit during worst-case surge) |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2 compliance; protects against human-body-model and system-level ESD events) |
| Junction Temperature Range | –55 °C to +175 °C (supports under-hood automotive and industrial environments without derating) |
| Capacitance | 513 pF at VR = 0 V, f = 1 MHz (low enough for USB 2.0 signal integrity; impacts high-speed data line selection) |
Pinout & Package
SMF (DO-219AB) package: low-profile, halogen-free molding compound, 3.9 mm × 1.9 mm × 1.08 mm body, cathode marked by bar on top surface. Compatible with SOD-123W footprint and wave/reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; forms current loop during clamping |
| Cathode | Protected line input terminal | Connected to line being protected (e.g., 24 V supply rail); conducts avalanche current when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a surges in 24 V automotive subsystems |
| ±5 % VBR tolerance (A-suffix) | Ensures consistent clamping threshold across production lots for deterministic overvoltage response |
| Low 513 pF capacitance | Minimizes signal distortion on 24 V analog sensor outputs and medium-speed digital control lines |
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, and ESD stress testing |
| Reflow/wave solder compatible | Supports automated PCB assembly without special process modifications or thermal derating |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: 24 V battery-supplied BCM with CAN/LIN communication and solenoid drivers exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V rail and chassis ground to clamp ISO 7637-2 Pulse 5a (75 V/300 ms) and Pulse 1 (–150 V/100 ms). Use Value: Limits rail voltage to ≤34 V during 11.33 A surge, preventing damage to LDOs, microcontrollers, and CAN transceivers downstream. |
Use Scenario: 4–20 mA current-loop analog input stage in an industrial PLC receiving signals from remote field sensors over long cables. IC Role / Device Role / Timing Role: Standoff-rated TVS on the input terminals to suppress induced lightning surges and ESD events per IEC 61000-4-5 (Level 3, 2 kV) and IEC 61000-4-2. Use Value: Clamps transients within 1 ns response time while adding only 513 pF loading, preserving loop accuracy and avoiding false triggering of ADC front-end. |
| USB Type-C VBUS Line Protection | Smart Building HVAC Sensor Interface |
Use Scenario: USB Type-C receptacle on a portable diagnostic tool powered from external 24 V adapter, with VBUS routed through internal DC-DC converter. IC Role / Device Role / Timing Role: Primary TVS on VBUS line upstream of buck converter to absorb hot-plug overshoot and ESD from mating cycles. Use Value: Withstands ±30 kV contact discharge without degradation and clamps to 34 V, protecting 5 V output stage and USB PD controller ICs. |
Use Scenario: RS-485-based temperature/humidity sensor node installed in HVAC ductwork, connected via 100 m twisted-pair cable to central controller. IC Role / Device Role / Timing Role: TVS on differential RS-485 bus lines (A/B) referenced to local ground to suppress common-mode surges induced by nearby AC motors. Use Value: Provides symmetrical 34 V clamping on each line while maintaining <0.05 μA leakage at 20.5 V, ensuring no bias shift in receiver input thresholds. |
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 | 22 V VRWM, 35.5 V VC at 11.3 A, SMA package (DO-214AC), 1.5× larger footprint | Higher clamping voltage; less suitable for tight 24 V rail margins; requires PCB layout revision | Select when legacy SMA footprint is fixed and 35.5 V clamping is acceptable for downstream ICs |
| TPSMD22A | 22 V VRWM, 35.5 V VC at 11.3 A, SMD package (DO-214AB), 200 W rating (half the power) | Lower surge capability; not rated for ISO 7637-2 Pulse 5a; limited to lower-energy transients | Choose only for cost-sensitive consumer applications where 200 W peak power suffices and AEC-Q101 is not required |
Compared with SMAJ22A and TPSMD22A, the VTVS21ASMF-M3-08 offers tighter 20.5 V VRWM alignment with 24 V systems, lower 34 V clamping for improved IC survivability, full 400 W rating for automotive-grade surge immunity, and AEC-Q101 qualification - making it the preferred choice for new designs targeting functional safety and long-term reliability.
Availability
VTVS21ASMF-M3-08 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC analog inputs, and smart building sensor interfaces requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for VTVS21ASMF-M3-08 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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The VTVS eSMP® series targets compact, high-power transient suppression in space-constrained applications - designed specifically for AEC-Q101-compliant automotive subsystems and harsh-environment industrial controls where thermal stability and repeatable clamping are critical.
FAQ
What is the maximum clamping voltage of the VTVS21ASMF-M3-08 under standard test conditions?
The VTVS21ASMF-M3-08 has a maximum reverse clamping voltage (VC) of 34 V when subjected to its rated peak pulse current of 11.33 A using the 10/1000 μs waveform. This value is measured at the device terminals and represents the highest voltage that will appear across the VTVS21ASMF-M3-08 during a defined surge event, ensuring downstream components remain within safe operating limits.
Is the VTVS21ASMF-M3-08 qualified for automotive applications?
Yes, the VTVS21ASMF-M3-08 is AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and ESD per JESD22-A114. This qualification confirms its suitability for automotive powertrain, body electronics, and infotainment systems where reliability under thermal and electrical stress is mandatory - a key differentiator from non-qualified alternatives like generic SMAJ devices.
What does the "A" suffix in VTVS21ASMF-M3-08 indicate?
The "A" suffix in VTVS21ASMF-M3-08 denotes ±5 % tolerance on the reverse breakdown voltage (VBR), meaning the actual VBR falls between 23.0 V and 25.4 V at IT = 1 mA. This tighter tolerance ensures more predictable clamping behavior across production lots compared to "G"-suffix variants (±2 %), which are offered for higher-precision applications but are not used in this specific part number.
Can the VTVS21ASMF-M3-08 be used in bidirectional signal lines?
No, the VTVS21ASMF-M3-08 is a unidirectional TVS diode and must be used only on circuits with defined polarity - such as positive 24 V supply rails referenced to ground. For bidirectional signal lines like RS-485 or USB D+/D–, a bidirectional variant (e.g., VTVS21BSMF-M3-08) or dual-diode configuration is required; using VTVS21ASMF-M3-08 on AC-coupled or floating lines risks improper clamping or forward conduction during negative excursions.
What is the thermal resistance specification for the VTVS21ASMF-M3-08?
The VTVS21ASMF-M3-08 has a thermal resistance (RthJL) of 20 K/W from junction to lead when mounted on an infinite heat sink. This value reflects its ability to dissipate surge energy thermally during short-duration transients and supports design calculations for worst-case junction temperature rise - especially important in sealed enclosures or high-ambient-temperature deployments where airflow is limited.
VTVS21ASMF-M3-08 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-M3-08 FAQ
1.How can I place an order for VTVS21ASMF-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS21ASMF-M3-08 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-M3-08 reliable?
The price and inventory of VTVS21ASMF-M3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VTVS21ASMF-M3-08 is usually 5 days.
3.What payment methods are accepted for VTVS21ASMF-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS21ASMF-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS21ASMF-M3-08?
VTVS21ASMF-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS21ASMF-M3-08 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-M3-08?
For technical support, including VTVS21ASMF-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS21ASMF-M3-08 requirements.
6.How does Aetrix verify that VTVS21ASMF-M3-08 is sourced from the original manufacturer or authorized distributors?
All VTVS21ASMF-M3-08 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-M3-08 meets industry standards.
7.What is the process for return or replacement of VTVS21ASMF-M3-08?
All VTVS21ASMF-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS21ASMF-M3-08, 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-M3-08 part is unused and in its original packaging.
Return procedure for VTVS21ASMF-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS21ASMF-M3-08 Tags
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