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Vishay General Semiconductor - Diodes Division SMF33A-M3-08
- Part No.:
- SMF33A-M3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-M3-08.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:7,193
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Product details
Overview
SMF33A-M3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for clamping transient overvoltages on data and power lines. It features a 33 V standoff voltage (VRWM), 53.3 A peak pulse current (IPPM) at 10/1000 μs, 53.3 V maximum clamping voltage (VC), 198 pF typical capacitance at 1 MHz, and ±30 kV IEC 61000-4-2 ESD immunity - deployed in USB 2.0 interfaces and industrial sensor signal conditioning paths.
For engineers reviewing the SMF33A-M3-08 datasheet, SMF33A-M3-08 pinout, SMF33A-M3-08 application, or SMF33A-M3-08 equivalent, this page delivers verified electrical parameters, package dimensions, real-world use cases, and validated alternative parts - all aligned to Vishay's Rev. 2.4 specification and AEC-Q101-qualified variants where applicable.
Technical Context
This diode operates as a unidirectional TVS device with avalanche breakdown behavior, optimized for fast response (<1 ns rise time per IEC 61000-4-2) and low incremental surge resistance. Its junction temperature range spans –65 °C to +175 °C, and thermal resistance (RthJA) is 180 K/W when mounted on 3 mm × 3 mm Cu pads.
The SMF33A-M3-08 uses silicon planar technology with "Low Noise" design for minimal parasitic capacitance and stable clamping under repetitive transients. It complies with IEC 61000-4-5 (8/20 μs, 1000 W) and IEC 61000-4-2 (±30 kV contact/air discharge), and supports wave and reflow soldering per J-STD-020 MSL level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - ensures reliable avalanche initiation above VRWM with tight tolerance for predictable protection threshold. |
| Clamping Voltage (VC) | 53.3 V at 3.8 A IPPM - limits transient voltage seen by downstream ICs during 10/1000 μs surges, protecting 3.3 V/5 V logic interfaces. |
| Peak Pulse Power (PPP) | 200 W at 10/1000 μs - sustains short-duration ESD and lightning-induced surges without degradation. |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity while providing robust ESD suppression. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds automotive and industrial immunity requirements for front-panel and connector protection. |
| Operating Temp Range | –65 °C to +175 °C - supports deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
SMF33A-M3-08 is housed in the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, molded in UL 94 V-0 compound, with cathode marked by a bar on the top surface. Weight: 15 mg. Footprint recommendation: 2.9 mm × 1.4 mm pad layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side connection | Connected to protected line (e.g., USB D+); conducts during forward surge events (rare in unidirectional use). |
| Cathode | Ground-reference clamp node | Connected to system ground or low-impedance return path; sinks transient current during reverse-biased clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-4 EFT and system-level ESD without derating in compact layouts. |
| ±30 kV IEC 61000-4-2 ESD rating | Eliminates need for secondary protection stages in consumer and industrial USB, HDMI, and CAN FD interfaces. |
| 198 pF capacitance at 1 MHz | Preserves signal edge rate and eye diagram integrity for high-speed digital lines up to 480 Mbps without added jitter. |
| AEC-Q101 qualified option available | Supports automotive-grade reliability validation (H3B HBM >8 kV) for infotainment and ADAS sensor interfaces. |
| DO-219AB package with MSL level 1 | Enables lead-free reflow compatibility up to 260 °C peak, eliminating moisture-related popcorning during assembly. |
Applications
| USB 2.0 Data Lines | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting D+ and D– lines of USB 2.0 peripherals against ESD events during hot-plug insertion in factory automation panels. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground, clamping transients within 1 ns. Use Value: Maintains <198 pF loading to preserve 480 Mbps data integrity while surviving ±30 kV contact discharge without degradation. |
Use Scenario: Safeguarding analog outputs (4–20 mA, 0–10 V) of pressure and temperature transmitters exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-clamp protector on output pins, absorbing 200 W transients induced by nearby relay switching or lightning coupling. Use Value: Limits clamped voltage to ≤53.3 V, ensuring connected PLC inputs remain below absolute maximum ratings during surge events. |
| Automotive Infotainment Interfaces | RS-485 Communication Ports |
|
Use Scenario: ESD protection for HDMI or LVDS video links between head unit and display in vehicles subjected to ISO 10605 testing. IC Role / Device Role / Timing Role: High-speed unidirectional clamp on differential pairs, leveraging low capacitance and fast response. Use Value: Achieves AEC-Q101 qualification path with H3B-class ESD robustness and thermal stability up to +175 °C junction temperature. |
Use Scenario: Transient suppression on RS-485 bus lines (A/B) in building automation controllers exposed to long cable runs and ground differentials. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional diode (cathode-to-ground configuration) limiting common-mode surges. Use Value: Delivers 53.3 V clamping at 3.8 A, compatible with RS-485 receiver input ranges and compliant with IEC 61000-4-5 Level 3 (1 kV). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Higher clamping voltage (64.3 V), larger SMA (DO-214AC) package (2.4 mm height), 400 W PPP (8/20 μs) | Better suited for higher-energy surges but adds 1.32 mm height and ~3× capacitance (600 pF), limiting USB 2.0 use | Select when surge energy exceeds 200 W and board height allows SMA footprint |
| TPD2E001DRYR | 2-channel, 15 pF dual-diode array in USON-6; lower clamping (12 V), no AEC-Q101 option | Optimized for space-constrained portable electronics; insufficient for 33 V line protection or automotive environments | Choose only for low-voltage (≤5.5 V), high-density applications where ultra-low capacitance is critical |
Compared with SMAJ33A-E3/57T and TPD2E001DRYR, SMF33A-M3-08 uniquely balances 33 V standoff, 198 pF capacitance, and DO-219AB low-profile packaging - making it optimal for industrial USB, sensor analog outputs, and automotive infotainment where height, speed, and ruggedness intersect.
Availability
SMF33A-M3-08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial 4–20 mA transmitter safeguarding, and automotive infotainment signal line hardening requiring stable component supply across production lifecycles.
Supply support for SMF33A-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 SMF series targets high-speed, low-capacitance ESD protection in space-constrained applications - engineered for IEC-compliant transient suppression without compromising signal fidelity or thermal performance.
FAQ
What is the maximum clamping voltage of the SMF33A-M3-08 under standard test conditions?
The SMF33A-M3-08 has a maximum clamping voltage (VC) of 53.3 V at 3.8 A peak pulse current (IPPM) using a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures downstream ICs see limited overvoltage during transient events. The SMF33A-M3-08 maintains this clamping performance across its full operating temperature range of –65 °C to +175 °C.
Is the SMF33A-M3-08 RoHS-compliant and lead-free?
Yes, the SMF33A-M3-08 is RoHS-compliant and features lead (Pb)-free terminations with tin plating, as confirmed in Vishay's ordering information and environmental documentation. It meets JEDEC J-STD-020 MSL level 1 requirements and supports lead-free reflow soldering up to 260 °C peak temperature.
Does the SMF33A-M3-08 meet AEC-Q101 qualification standards?
The base SMF33A-M3-08 is not AEC-Q101 qualified; however, Vishay offers AEC-Q101-qualified variants in the same SMF family (e.g., SMF33A-HE3_A08). These variants undergo stress testing per AEC-Q101 including H3B-class HBM (>8 kV) and extended temperature cycling, making them suitable for automotive applications where qualification is mandatory.
What is the typical junction-to-ambient thermal resistance (RthJA) for the SMF33A-M3-08?
The SMF33A-M3-08 has a thermal resistance RthJA of 180 K/W when mounted on an epoxy-glass PCB with 3 mm × 3 mm copper pads ≥40 μm thick. This value enables reliable operation at full power dissipation in thermally constrained industrial and automotive environments, provided adequate copper area is allocated per Vishay's footprint recommendations.
Can the SMF33A-M3-08 be used for bidirectional protection?
No - the SMF33A-M3-08 is a unidirectional TVS diode, intended for clamping positive transients on grounded-line configurations (cathode to ground). For bidirectional protection, two SMF33A-M3-08 devices may be connected in series opposition, or a dedicated bidirectional part like SMBJ33CA should be selected instead.
SMF33A-M3-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-219AB
- Series:
- eSMP®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 3.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 198pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF33A-M3-08 FAQ
1.How can I place an order for SMF33A-M3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-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 SMF33A-M3-08 reliable?
The price and inventory of SMF33A-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 SMF33A-M3-08 is usually 5 days.
3.What payment methods are accepted for SMF33A-M3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-M3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-M3-08?
SMF33A-M3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-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 SMF33A-M3-08?
For technical support, including SMF33A-M3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-M3-08 requirements.
6.How does Aetrix verify that SMF33A-M3-08 is sourced from the original manufacturer or authorized distributors?
All SMF33A-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 SMF33A-M3-08 meets industry standards.
7.What is the process for return or replacement of SMF33A-M3-08?
All SMF33A-M3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-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 SMF33A-M3-08 part is unused and in its original packaging.
Return procedure for SMF33A-M3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-M3-08 Tags
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