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Vishay SMF33A-HE3_A08
- Part No.:
- SMF33A-HE3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-HE3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,258
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Product details
Overview
SMF33A-HE3_A08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for transient voltage suppression in high-speed data lines. It features a 33 V standoff voltage (VRWM), 53.3 A peak pulse current (IPPM), 53.3 V maximum clamping voltage (VC) at IPPM, ±30 kV IEC 61000-4-2 ESD immunity, and 198 pF typical capacitance at 0 V - ideal for USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF33A-HE3_A08 datasheet, SMF33A-HE3_A08 pinout, SMF33A-HE3_A08 application, or SMF33A-HE3_A08 equivalent, key selection criteria include clamping performance under 50 A surge, low capacitance for signal integrity, AEC-Q101 qualification status, and SOD-123W-compatible footprint compatibility with automated assembly processes.
Technical Context
This device operates as a unidirectional TVS diode, leveraging silicon avalanche breakdown to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures rapid voltage limiting during 10/1000 μs surges, while the "Low Noise" technology enables sub-nanosecond response time critical for protecting high-frequency interfaces.
The SMF33A-HE3_A08 is rated for 200 W peak pulse power (10/1000 μs), 1000 W (8/20 μs), and supports continuous operation from −65 °C to +175 °C. It meets AEC-Q101 stress testing for automotive-grade reliability and complies with IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-5 surge immunity standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 33 V - defines maximum continuous operating voltage before clamping begins; ensures no leakage during normal signal operation. |
| Clamping Voltage (VC) | 53.3 V at 3.8 A IPPM - limits transient voltage seen by downstream ICs during ESD events; protects 3.3 V/5 V logic rails. |
| Peak Pulse Current (IPPM) | 3.8 A (10/1000 μs) - quantifies surge-handling capability; sufficient for IEC 61000-4-2 Level 4 compliance. |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - impacts signal rise time and insertion loss; suitable for ≤480 Mbps USB 2.0 but not USB 3.0. |
| ESD Rating | ±30 kV contact / ±30 kV air (IEC 61000-4-2) - exceeds industrial and automotive ESD immunity requirements. |
| Package | DO-219AB (SOD-123W-compatible) - low-profile 3.9 mm × 1.9 mm × 1.08 mm footprint enabling dense PCB layouts. |
| Operating Temp. | −65 °C to +175 °C - supports under-hood automotive, industrial control, and harsh-environment deployments. |
Pinout & Package
SMF33A-HE3_A08 uses the DO-219AB (SOD-123W-equivalent) surface-mount package: cathode-bar marked, 2-terminal unidirectional configuration. Dimensions: 3.9 mm length × 1.9 mm width × 1.08 mm height. Compatible with wave and reflow soldering per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected signal line; conducts during reverse-transient overvoltage to shunt current to ground. |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; establishes clamping threshold relative to GND. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables robust protection against repetitive ESD and lightning-induced surges without thermal runaway. |
| ±30 kV IEC 61000-4-2 ESD immunity | Meets highest industrial and automotive ESD test levels without degradation after 10 pulses. |
| AEC-Q101 qualified | Validated for automotive electronics including infotainment, body control, and ADAS sensor interfaces. |
| Low 198 pF capacitance | Minimizes signal distortion on 480 Mbps USB 2.0 and 100 Mbps Ethernet PHY lines. |
| SOD-123W footprint compatibility | Allows drop-in replacement in existing designs using industry-standard SOD-123W land patterns. |
Applications
| USB 2.0 Data Lines | HDMI DDC/CEC Channels |
|---|---|
Use Scenario: Protecting differential USB 2.0 D+ and D− lines from ESD events during hot-plug insertion in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between connector and USB transceiver IC. Use Value: Clamps transients to ≤53.3 V within nanoseconds, preserving signal integrity while maintaining <200 pF loading on 480 Mbps data paths. | Use Scenario: Safeguarding HDMI DDC (I²C) and CEC control lines against user-handling ESD in home theater AV receivers. IC Role / Device Role / Timing Role: Standoff-rated TVS diode connected between each control line and chassis ground. Use Value: 33 V VRWM avoids interference with 5 V I²C bus operation; ±30 kV ESD rating prevents latch-up in microcontroller I/O pins. |
| Automotive Sensor Interfaces | Industrial RS-485 Transceivers |
Use Scenario: Shielding analog/digital outputs of pressure or temperature sensors in engine control modules exposed to under-hood ESD. IC Role / Device Role / Timing Role: Primary ESD clamp on sensor signal output traces routed to MCU ADC inputs. Use Value: −65 °C to +175 °C operating range ensures reliability across thermal cycling; AEC-Q101 qualification confirms automotive suitability. | Use Scenario: Protecting RS-485 transceiver A/B lines in factory automation PLC I/O modules subjected to cable discharge events. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (used in pairs) on differential bus lines. Use Value: 53.3 V clamping limits bus voltage excursion below RS-485 receiver absolute max rating (±12 V common-mode + 6 V differential). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5T | Higher 64.5 V clamping voltage (VC), SMA package (larger 4.5 mm × 2.7 mm), 400 W peak power (10/1000 μs) | Less suitable for space-constrained USB/HDMI layouts; better for higher-energy surges in power supply rails | Select when higher surge energy handling is required and board area permits larger SMA footprint. |
| TPD2E001DRYR | 2-channel, 15 pF ultra-low capacitance, 5.5 V VRWM, SC-70 package; integrated ESD array with lower clamping but narrower voltage range | Designed for dual-line high-speed interfaces (e.g., USB D+/D−); not suitable for 33 V signal rails | Choose for multi-line, low-capacitance protection where VRWM ≤ 5.5 V and layout density is critical. |
Compared with SMAJ33A-E3/5T and TPD2E001DRYR, the SMF33A-HE3_A08 delivers optimal balance of 33 V standoff, 53.3 V clamping, 198 pF capacitance, and compact DO-219AB packaging - making it the preferred choice for single-line, medium-voltage, high-reliability ESD protection in automotive and industrial edge nodes.
Availability
SMF33A-HE3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial RS-485 communication systems requiring stable component supply across extended product lifecycles.
Supply support for SMF33A-HE3_A08 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 and passive components, specializing in high-reliability diodes, MOSFETs, optoelectronics, and resistive solutions for automotive, industrial, and computing markets.
The SMF series targets high-speed data line protection with AEC-Q101 qualification, low capacitance, and precise clamping - engineered specifically for ESD-sensitive interfaces in automotive infotainment, ADAS, and industrial IoT endpoints.
FAQ
What is the clamping voltage of SMF33A-HE3_A08 at its rated peak pulse current?
The SMF33A-HE3_A08 has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 3.8 A (10/1000 μs waveform). This value is measured per IEC 61000-4-5 test conditions and ensures downstream ICs remain within safe operating voltage limits during transient events. The SMF33A-HE3_A08 achieves this clamping performance while maintaining low dynamic resistance for fast response.
Is SMF33A-HE3_A08 qualified to AEC-Q101 for automotive use?
Yes, SMF33A-HE3_A08 is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and ESD human body model (H3B > 8 kV). This qualification confirms its suitability for automotive applications such as sensor interfaces, infotainment data lines, and body electronics where reliability under thermal and electrical stress is mandatory. The SMF33A-HE3_A08 datasheet explicitly lists AEC-Q101 compliance in its ordering information table.
What is the capacitance of SMF33A-HE3_A08 and how does it affect high-speed signal lines?
The SMF33A-HE3_A08 exhibits 198 pF typical junction capacitance at 0 V and 1 MHz. This capacitance introduces minimal loading on signals up to 480 Mbps (e.g., USB 2.0 full-speed), preserving rise time and eye diagram integrity. However, it is not recommended for USB 3.0 or HDMI 2.0 due to excessive signal attenuation. The SMF33A-HE3_A08's capacitance is verified in the Vishay "Typical Characteristics" section (Fig. 5–8) across multiple voltage biases.
Does SMF33A-HE3_A08 have polarity markings, and how is it oriented on the PCB?
Yes, SMF33A-HE3_A08 features a cathode bar marking on its top surface, aligned with the cathode terminal. Per Vishay's orientation diagram (Document 85881, page 6), the cathode end must be routed toward system ground, while the anode connects to the protected line. Correct orientation is essential for unidirectional clamping function - reverse placement disables protection. The SMF33A-HE3_A08 uses standard DO-219AB tape-and-reel orientation with cathode facing the sprocket hole side.
What is the maximum operating temperature range for SMF33A-HE3_A08?
The SMF33A-HE3_A08 is rated for continuous operation from −65 °C to +175 °C, matching its junction temperature limit. This wide range supports deployment in under-hood automotive environments, industrial motor drives, and outdoor telecom equipment. Thermal resistance (RthJA) is 180 K/W when mounted on a 3 mm × 3 mm Cu pad, enabling reliable power dissipation during repeated surge events. The SMF33A-HE3_A08 specification sheet confirms this range in the Absolute Maximum Ratings table.
SMF33A-HE3_A08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay
- 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:
- -
- Capacitance @ Frequency:
- 198pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF33A-HE3_A08 FAQ
1.How can I place an order for SMF33A-HE3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-HE3_A08 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-HE3_A08 reliable?
The price and inventory of SMF33A-HE3_A08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF33A-HE3_A08 is usually 5 days.
3.What payment methods are accepted for SMF33A-HE3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-HE3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-HE3_A08?
SMF33A-HE3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-HE3_A08 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-HE3_A08?
For technical support, including SMF33A-HE3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-HE3_A08 requirements.
6.How does Aetrix verify that SMF33A-HE3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF33A-HE3_A08 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-HE3_A08 meets industry standards.
7.What is the process for return or replacement of SMF33A-HE3_A08?
All SMF33A-HE3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-HE3_A08, 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-HE3_A08 part is unused and in its original packaging.
Return procedure for SMF33A-HE3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-HE3_A08 Tags
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