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Vishay SMF33A-HM3_A08
- Part No.:
- SMF33A-HM3_A08
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-HM3_A08.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,591
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Product details
Overview
SMF33A-HM3_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 clamping voltage (VC) at IPPM, ±30 kV IEC 61000-4-2 ESD immunity, and 198 pF typical capacitance at 1 MHz - ideal for USB 2.0, HDMI, and industrial sensor interface protection.
For engineers reviewing the SMF33A-HM3_A08 datasheet, SMF33A-HM3_A08 pinout, SMF33A-HM3_A08 application, or SMF33A-HM3_A08 equivalent, key selection criteria include clamping performance under 50 A surge, low capacitance for signal integrity, AEC-Q101 qualification status, and compatibility with SOD-123W footprint layouts.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transients above its reverse standoff voltage. Its low incremental surge resistance ensures rapid response (<1 ns) and stable clamping during 10/1000 μs surges up to 200 W peak power.
The SMF33A-HM3_A08 is rated for operation from –65 °C to +175 °C, with thermal resistance RthJA = 180 K/W on standard epoxy-glass PCBs. It meets IEC 61000-4-2 (±30 kV contact/air) and AEC-Q101 Class H3B (>8 kV HBM) requirements, confirming suitability for automotive and harsh-environment industrial use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 33 V - maximum continuous reverse operating voltage before clamping begins |
| Clamping Voltage (VC) | 53.3 V at 3.8 A IPPM - limits downstream IC voltage stress during ESD events |
| Peak Pulse Current (IPPM) | 3.8 A (10/1000 μs) - surge-handling capacity aligned with IEC 61000-4-5 Level 3 |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - low enough for USB 2.0 (480 Mbps) signal integrity |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds industrial immunity requirements |
| Package | DO-219AB (SOD-123W compatible) - 3.9 mm × 1.9 mm × 1.08 mm low-profile footprint |
| Operating Temp | –65 °C to +175 °C - supports under-hood automotive and wide-temperature industrial deployment |
Pinout & Package
SMF33A-HM3_A08 uses the DO-219AB (SOD-123W-compatible) surface-mount package: 2-terminal, cathode-bar marked, 3.9 mm length × 1.9 mm width × 1.08 mm height, MSL level 1, reflow-solderable per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/line side | Connected to protected signal line; conducts during forward-biased surges |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise fast-response clamping | Sub-nanosecond response enables effective suppression of ESD pulses per IEC 61000-4-2 |
| AEC-Q101 qualified variant | SMF33A-HM3_A08 carries AEC-Q101 qualification - validated for automotive electronics reliability |
| SOD-123W footprint compatibility | Enables drop-in replacement or layout reuse with existing SOD-123W designs |
| 1000 W peak pulse power (8/20 μs) | Supports robust surge immunity per IEC 61000-4-5, including lightning-induced transients |
Applications
| USB 2.0 Interface Protection | HDMI Data Line Protection |
|---|---|
Use Scenario: Protecting D+ and D− differential pairs in USB 2.0 host/peripheral ports against ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients before they reach the USB transceiver. Use Value: 198 pF capacitance avoids signal distortion at 480 Mbps; 53.3 V clamping prevents damage to 3.3 V tolerant PHYs. | Use Scenario: Safeguarding TMDS clock and data channels in HDMI 1.4 receivers against hot-plug and ESD events. IC Role / Device Role / Timing Role: Signal-line TVS element referenced to chassis ground, absorbing fast transients without loading high-speed signals. Use Value: Low capacitance preserves edge integrity; ±30 kV ESD rating exceeds HDMI compliance test levels. |
| Automotive Sensor Interface | Industrial CAN Bus Node |
Use Scenario: Shielding analog or digital outputs of pressure/temperature sensors in engine control modules from load dump and ESD. IC Role / Device Role / Timing Role: Standoff-clamp protector on sensor output line, activated only during overvoltage events. Use Value: –65 °C to +175 °C rating matches under-hood thermal range; AEC-Q101 qualification confirms automotive reliability. | Use Scenario: Adding secondary ESD protection on CAN_H/CAN_L lines downstream of primary common-mode choke and bus transceiver. IC Role / Device Role / Timing Role: Unidirectional shunt device limiting voltage excursions on individual CAN lines relative to ground. Use Value: 33 V VRWM aligns with 12 V automotive supply margin; 53.3 V VC ensures transceiver input remains within absolute max ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A | Higher clamping voltage (64.3 V), larger SMA package (4.5 mm × 2.7 mm), 200 W rating same | Less suitable for space-constrained USB/HDMI layouts; better for higher-energy industrial surges | Select when board area allows larger footprint and higher clamping is acceptable for 3.3 V systems |
| TPD2E001DRYR | 2-channel, 15 pF per line, 12 V VRWM, not AEC-Q101 qualified, 5-pin X2SON | Designed for dual-line high-speed interfaces (e.g., I²C, USB D+/D−); lower capacitance but lower voltage rating | Prefer for compact dual-line protection where 33 V standoff is unnecessary and ultra-low capacitance is critical |
Compared with SMAJ33A-E3/5A and TPD2E001DRYR, SMF33A-HM3_A08 delivers optimal balance of low profile, AEC-Q101 qualification, 33 V standoff, and 198 pF capacitance - making it the preferred choice for automotive-grade USB 2.0 and sensor interface protection where space and reliability are constrained.
Availability
SMF33A-HM3_A08 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, automotive sensor signal conditioning, and industrial CAN node hardening requiring stable component supply across production lifecycles.
Supply support for SMF33A-HM3_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, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMF series targets high-speed data line protection with AEC-Q101 qualification, low capacitance, and robust ESD immunity - engineered specifically for automotive infotainment, ADAS sensor interfaces, and industrial IoT connectivity.
FAQ
What is the clamping voltage of SMF33A-HM3_A08 at its rated peak pulse current?
The SMF33A-HM3_A08 has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 3.8 A using a 10/1000 μs waveform. This value is measured per the conditions specified in Vishay's official datasheet revision 2.4 (July 2023), ensuring predictable overvoltage limiting for downstream 3.3 V or 5 V ICs in the SMF33A-HM3_A08 protection circuit.
Is SMF33A-HM3_A08 qualified to AEC-Q101 standards?
Yes, SMF33A-HM3_A08 is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMF5V0A–SMF58A datasheet (Rev. 2.4). This qualification covers stress tests including HBM (>8 kV), temperature cycling, and high-temperature operating life - validating SMF33A-HM3_A08 for automotive electronic control units and under-hood applications.
What package type does SMF33A-HM3_A08 use, and is it compatible with automated assembly?
SMF33A-HM3_A08 uses the DO-219AB package (also known as SOD-123W), measuring 3.9 mm × 1.9 mm × 1.08 mm. It is fully compatible with wave and reflow soldering per JEDEC J-STD-020 (MSL level 1), and its cathode-bar marking and tape-and-reel packaging (A08 = 3 k per 7″ reel) support high-volume automated placement and assembly of SMF33A-HM3_A08 in production environments.
How does the 198 pF capacitance of SMF33A-HM3_A08 affect high-speed signal integrity?
The 198 pF typical capacitance of SMF33A-HM3_A08 at 0 V and 1 MHz is optimized for USB 2.0 (480 Mbps) and industrial sensor interfaces where moderate bandwidth preservation is required. While higher than ultra-low-capacitance arrays (<5 pF), this value avoids significant signal rise-time degradation on sub-50 MHz digital lines - making SMF33A-HM3_A08 appropriate for cost-sensitive, single-line protection where full differential arrays are unnecessary.
Can SMF33A-HM3_A08 be used in bidirectional signal paths?
No, SMF33A-HM3_A08 is a unidirectional TVS diode, intended for circuits where the protected line operates at a fixed DC bias relative to ground (e.g., 3.3 V or 5 V I/O). For bidirectional AC-coupled or floating signal paths like RS-485 or CAN, a bidirectional variant such as SMF33CA-HM3_A08 - or a dedicated bidirectional array - must be selected instead of SMF33A-HM3_A08.
SMF33A-HM3_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-HM3_A08 FAQ
1.How can I place an order for SMF33A-HM3_A08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-HM3_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-HM3_A08 reliable?
The price and inventory of SMF33A-HM3_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-HM3_A08 is usually 5 days.
3.What payment methods are accepted for SMF33A-HM3_A08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-HM3_A08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-HM3_A08?
SMF33A-HM3_A08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-HM3_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-HM3_A08?
For technical support, including SMF33A-HM3_A08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-HM3_A08 requirements.
6.How does Aetrix verify that SMF33A-HM3_A08 is sourced from the original manufacturer or authorized distributors?
All SMF33A-HM3_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-HM3_A08 meets industry standards.
7.What is the process for return or replacement of SMF33A-HM3_A08?
All SMF33A-HM3_A08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-HM3_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-HM3_A08 part is unused and in its original packaging.
Return procedure for SMF33A-HM3_A08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-HM3_A08 Tags
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