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Vishay General Semiconductor - Diodes Division VTVS33ASMF-M3-18
- Part No.:
- VTVS33ASMF-M3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
VTVS33ASMF-M3-18.pdf
- Description:
- TVS DIODE 33.3VWM 55VC DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,599
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Product details
Overview
VTVS33ASMF-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 such as USB, HDMI, and automotive sensor interfaces. It features a 33.3 V maximum stand-off voltage (VRWM), 37.1–41.0 V reverse breakdown voltage (VBR) at 1 mA, and clamps to ≤55 V at 6.91 A peak pulse current (10/1000 μs).
For engineers reviewing the VTVS33ASMF-M3-18 datasheet, VTVS33ASMF-M3-18 pinout, VTVS33ASMF-M3-18 application, or VTVS33ASMF-M3-18 equivalent, this device is selected for robust ±30 kV IEC 61000-4-2 ESD protection, low-profile SMT integration, and high-temperature operation up to +175 °C in space-constrained automotive and industrial control systems.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR range. Its low 2095 pF junction capacitance at 0 V enables use on high-speed data lines without signal integrity degradation.
Thermal resistance is rated at 20 K/W (junction-to-lead, infinite heat sink), supporting reliable power dissipation during repetitive transients. The device meets AEC-Q101 qualification requirements and is halogen-free per Vishay's material categorization standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W (10/1000 μs waveform - sustains automotive load-dump and ISO 7637-2 transient suppression) |
| Stand-off Voltage (VRWM) | 33.3 V - maximum continuous reverse voltage before leakage exceeds 0.05 μA |
| Breakdown Voltage (VBR) | 37.1–41.0 V at IT = 1 mA - defines precise clamping onset threshold |
| Clamping Voltage (VC) | ≤55 V at IPPM = 6.91 A - limits protected circuit voltage during worst-case surge |
| Junction Capacitance (CD) | 379 pF at VR = 0 V, f = 1 MHz - compatible with <100 Mbps data lines (e.g., CAN FD, LIN) |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - eliminates need for secondary ESD stages |
| Operating Temperature | −55 °C to +175 °C - supports under-hood automotive and industrial environments |
Pinout & Package
Package: SMF (DO-219AB), low-profile surface-mount case with cathode bar marking. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H). Compatible with SOD-123W footprint and reflow soldering (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; forms clamping loop with cathode |
| Cathode | Protected line input | Connected to signal/power line requiring protection; conducts avalanche current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| "Low-Noise" fast response | Sub-nanosecond turn-on ensures clamping before sensitive ICs experience overstress |
| Wave & reflow solderable | Qualified for standard Pb-free reflow profiles (J-STD-020 MSL level 1) - no special handling required |
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors |
| Halogen-free molding compound | Complies with IEC 61249-2-21 and RoHS - supports green manufacturing and end-of-life compliance |
| Low-profile SMF package | 1.08 mm height enables placement beneath connectors or in tight board gaps (e.g., camera modules) |
Applications
| Automotive Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to ISO 16750-2 load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground to clamp transients before reaching MCU ADC inputs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V analog front-ends while maintaining <1 μA leakage at 33.3 V operating voltage. |
Use Scenario: Safeguarding USB 2.0 D+/D− lines against ESD events during hot-plug insertion in infotainment head units. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode tied to VBUS or signal line) providing primary ESD shunt path. Use Value: Delivers ±30 kV IEC 61000-4-2 protection without degrading 480 Mbps signal integrity due to 379 pF capacitance. |
| Industrial CAN Bus Node | Power Supply Input Rail Clamp |
Use Scenario: Secondary protection on CANH/CANL lines downstream of common-mode chokes in factory automation controllers. IC Role / Device Role / Timing Role: Standoff-clamp TVS absorbing differential-mode surges exceeding transceiver ratings (e.g., ISO 11898-2 fast transients). Use Value: Clamps to ≤55 V within nanoseconds, preserving CAN signal eye diagram and preventing bit errors during EMC testing. |
Use Scenario: Input-stage surge suppression on 24 V DC power rails feeding PLC I/O modules subjected to IEC 61000-4-4 EFT bursts. IC Role / Device Role / Timing Role: Primary unidirectional clamp between rail and ground, diverting 400 W pulses away from upstream regulators and filters. Use Value: Handles 6.91 A peak pulse current (10/1000 μs) without degradation, enabling single-device protection without parallel staging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Same VRWM (33 V), but lower PPPM (400 W same), higher VC (53.3 V), larger SMA package (4.5 mm × 2.7 mm) | Less suitable for ultra-thin designs; higher thermal resistance (35 K/W) reduces surge repetition capability | Select VTVS33ASMF-M3-18 for space-constrained PCBs requiring DO-219AB footprint and AEC-Q101 validation. |
| 1.5SMC33A | Same VRWM (33 V), but higher VC (53.3 V), larger SMC package (7.1 mm × 6.2 mm), MSL level 1 not guaranteed | Not recommended for automotive or high-density layouts; lacks halogen-free certification | Choose VTVS33ASMF-M3-18 when halogen-free compliance, 1.08 mm profile, and verified AEC-Q101 performance are mandatory. |
Compared with SMAJ33A-E3/57T and 1.5SMC33A, VTVS33ASMF-M3-18 delivers identical clamping performance in a 45 % smaller footprint, with guaranteed AEC-Q101 qualification and halogen-free construction - critical for next-generation automotive ECUs and compact industrial gateways.
Availability
VTVS33ASMF-M3-18 is available at Aetrix Electronics and suitable for automotive sensor interfaces, USB 2.0 data line protection, industrial CAN bus nodes, and 24 V DC power supply rail clamping requiring stable component supply across long production lifecycles.
Supply support for VTVS33ASMF-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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The VTVS eSMP® Series targets high-speed, high-temperature transient protection in space-constrained applications - engineered specifically for AEC-Q101 compliance and seamless integration into modern automotive and industrial PCB layouts.
FAQ
What is the maximum clamping voltage of the VTVS33ASMF-M3-18 under peak pulse conditions?
The VTVS33ASMF-M3-18 clamps to a maximum of 55 V when subjected to its rated 6.91 A peak pulse current (10/1000 μs waveform). This value is measured at the device terminals and ensures downstream 3.3 V or 5 V logic circuits remain within safe operating voltage margins during surge events.
Is the VTVS33ASMF-M3-18 suitable for automotive applications?
Yes, the VTVS33ASMF-M3-18 is AEC-Q101 qualified and rated for operation from −55 °C to +175 °C. Its halogen-free construction, 400 W surge rating, and ±30 kV ESD immunity make it suitable for engine control units, body electronics, and ADAS sensor interfaces per ISO 16750 and ISO 7637 standards.
Does the VTVS33ASMF-M3-18 have polarity markings, and how is it oriented on the PCB?
Yes, the VTVS33ASMF-M3-18 uses a cathode bar marking on the package top surface. During PCB layout, the cathode must be connected to the line being protected (e.g., signal or power rail), and the anode to ground - reversing polarity prevents proper clamping function.
What is the junction capacitance of the VTVS33ASMF-M3-18, and how does it affect high-speed data lines?
The VTVS33ASMF-M3-18 exhibits 379 pF typical junction capacitance at 0 V bias and 1 MHz. This value is low enough to avoid significant signal attenuation or timing skew on USB 2.0, CAN, and LIN buses, provided layout minimizes parasitic inductance in the TVS ground path.
Can the VTVS33ASMF-M3-18 replace older SMA or SMC package TVS diodes in existing designs?
The VTVS33ASMF-M3-18 is not a direct drop-in replacement due to its smaller DO-219AB (SMF) footprint. While electrical parameters align closely with SMAJ33A and 1.5SMC33A, PCB redesign is required to accommodate the 3.9 mm × 1.9 mm pad layout and 1.08 mm height constraint.
VTVS33ASMF-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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 55V
- Current - Peak Pulse (10/1000µs):
- 6.91A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 379pF @ 1MHz
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
VTVS33ASMF-M3-18 FAQ
1.How can I place an order for VTVS33ASMF-M3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VTVS33ASMF-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 VTVS33ASMF-M3-18 reliable?
The price and inventory of VTVS33ASMF-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 VTVS33ASMF-M3-18 is usually 5 days.
3.What payment methods are accepted for VTVS33ASMF-M3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VTVS33ASMF-M3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VTVS33ASMF-M3-18?
VTVS33ASMF-M3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VTVS33ASMF-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 VTVS33ASMF-M3-18?
For technical support, including VTVS33ASMF-M3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VTVS33ASMF-M3-18 requirements.
6.How does Aetrix verify that VTVS33ASMF-M3-18 is sourced from the original manufacturer or authorized distributors?
All VTVS33ASMF-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 VTVS33ASMF-M3-18 meets industry standards.
7.What is the process for return or replacement of VTVS33ASMF-M3-18?
All VTVS33ASMF-M3-18 units undergo pre-shipment inspection (PSI). If there is an issue with VTVS33ASMF-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 VTVS33ASMF-M3-18 part is unused and in its original packaging.
Return procedure for VTVS33ASMF-M3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VTVS33ASMF-M3-18 Tags
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