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Vishay General Semiconductor - Diodes Division SMF33A-HM3-08
- Part No.:
- SMF33A-HM3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF33A-HM3-08.pdf
- Description:
- TVS DIODE 33VWM 53.3VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:2,004
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Product details
Overview
SMF33A-HM3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in DO-219AB (SOD-123W) package, designed for I/O line transient suppression in automotive and industrial interfaces. It features a 33 V stand-off voltage (VRWM), 53.3 A peak pulse current (IPPM, 10/1000 μs), 198 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 contact/air ESD immunity, and AEC-Q101 qualification.
For engineers reviewing the SMF33A-HM3-08 datasheet, SMF33A-HM3-08 pinout, SMF33A-HM3-08 application, or SMF33A-HM3-08 equivalent, this device is selected for high-reliability CAN, LIN, and sensor interface protection where low clamping voltage (<53.3 V), robust surge handling (200 W, 10/1000 μs), and automotive-grade qualification are required.
Technical Context
This unidirectional TVS diode operates as a clamping device in reverse-biased configuration, activating above its 33 V working voltage to shunt transients to ground. Its low incremental surge resistance ensures fast response and minimal voltage overshoot during ESD events.
Designed for placement directly at connector or port entry points, it supports high-speed data lines with 198 pF capacitance - optimized for sub-1 Mbps interfaces like CAN FD physical layer stubs, LIN bus nodes, and analog sensor inputs where signal integrity must be preserved under ±30 kV ESD stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 33 V - maximum continuous reverse voltage before clamping begins; sets operating margin for 24 V automotive systems. |
| Peak Pulse Current (IPPM) | 53.3 A (10/1000 μs) - sustains high-energy surges without failure; enables compliance with ISO 7637-2 Pulse 1/2a. |
| Clamping Voltage (VC) | 53.3 V at IPPM - limits voltage seen by downstream ICs; critical for protecting 3.3 V/5 V interface receivers. |
| Capacitance (CD) | 198 pF at 0 V, 1 MHz - suitable for LIN (≤20 kbps) and low-speed CAN (≤125 kbps); avoids signal distortion. |
| ESD Rating | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - exceeds Level 4 immunity requirements for automotive ECUs. |
| AEC-Q101 Qualified | Yes - validated for automotive underhood and cabin applications with temperature range −65 °C to +175 °C. |
| Package | DO-219AB (SOD-123W) - 3.9 mm × 1.9 mm × 1.08 mm low-profile outline compatible with automated SMT assembly. |
Pinout & Package
DO-219AB (SOD-123W) package: cathode-marked single-ended diode with anode and cathode terminals only. Molded plastic case, MSL level 1, RoHS-compliant, lead (Pb)-free tin-plated terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Input/line side terminal | Connected to protected signal line (e.g., CAN_H, LIN, sensor output); referenced to system ground via cathode. |
| Cathode (K) | Ground reference terminal | Connected to chassis or functional ground; provides low-impedance path for transient current during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 200 W peak pulse power (10/1000 μs) | Enables sustained suppression of long-duration load dump transients in 24 V vehicle networks. |
| "Low Noise" fast-response technology | Sub-nanosecond turn-on time minimizes voltage overshoot during ESD events, preserving signal fidelity. |
| Wave and reflow solderable | Compatible with standard Pb-free reflow profiles (peak ≤260 °C), supporting high-yield automated manufacturing. |
| UL 94 V-0 molding compound | Ensures flame-retardant behavior in enclosed automotive modules and industrial enclosures. |
| 15 mg package weight | Reduces mechanical stress on PCB traces during thermal cycling, improving long-term reliability in vibration-prone environments. |
Applications
| Automotive CAN Bus Node | LIN Bus Transceiver Protection |
|---|---|
|
Use Scenario: Protecting CAN_H/CAN_L lines at ECU connector entry against ESD and coupled transients. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between signal line and chassis ground. Use Value: Limits clamped voltage to ≤53.3 V, preventing damage to CAN transceivers rated for 40 V absolute max. |
Use Scenario: Safeguarding LIN transceiver pins (e.g., LIN bus line) from human-body-model ESD events during service access. IC Role / Device Role / Timing Role: Standoff-clamp TVS diode connected inline with LIN signal path. Use Value: 198 pF capacitance avoids signal rise-time degradation on 19.2 kbps LIN frames while passing ±30 kV ESD. |
| Industrial Analog Sensor Interface | Automotive Cabin Temperature Sensor |
|
Use Scenario: Shielding 4–20 mA or 0–5 V analog outputs from field-induced surges in factory automation wiring. IC Role / Device Role / Timing Role: Reverse-biased transient suppressor on sensor output trace. Use Value: 33 V VRWM matches common 24 V loop-powered sensor rails; 53.3 A IPPM handles inductive kickback from nearby solenoids. |
Use Scenario: ESD protection for NTC thermistor signal lines routed through dashboard harnesses exposed to dry-air static discharge. IC Role / Device Role / Timing Role: Low-capacitance TVS on thermistor bias/sense node. Use Value: AEC-Q101 qualification ensures operation across −40 °C to +125 °C ambient, matching cabin thermal envelope. |
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 | DO-214AC (SMA) package; 3.5 mm × 4.3 mm footprint; 1000 W peak power (8/20 μs), but higher 220 pF capacitance. | Less suitable for space-constrained PCBs; higher capacitance may distort >100 kbps signals. | Choose SMAJ33A-E3/57T only when higher 8/20 μs surge rating is prioritized over board area and speed. |
| TPD2E001DRYR | 2-channel bidirectional array in SOT-553; 15 pF per channel; 12 V VRWM; not AEC-Q101 qualified. | Targeted at USB/low-voltage digital I/O; insufficient for 24 V automotive supply rail coupling. | Select TPD2E001DRYR for consumer-grade 3.3 V data lines, not for automotive 24 V system-level protection. |
Compared with SMAJ33A-E3/57T and TPD2E001DRYR, SMF33A-HM3-08 uniquely balances AEC-Q101 qualification, 33 V standoff, 198 pF capacitance, and DO-219AB compactness - making it the preferred choice for CAN/LIN nodes where automotive reliability and layout density are both critical.
Availability
SMF33A-HM3-08 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and LIN/CAN subsystem prototyping requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMF33A-HM3-08 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 automotive-grade transient voltage suppression, engineered specifically for AEC-Q101 compliance, high-temperature operation, and integration into space-constrained ECU front-end protection circuits.
FAQ
What is the clamping voltage of the SMF33A-HM3-08 under peak pulse conditions?
The SMF33A-HM3-08 has a maximum reverse clamping voltage (VC) of 53.3 V at 53.3 A peak pulse current (10/1000 μs waveform). This value is specified in the Electrical Characteristics table of Vishay's document 85881 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMF33A-HM3-08 maintains this clamping performance across its full operating temperature range.
Is the SMF33A-HM3-08 suitable for bidirectional signal lines like USB or HDMI?
No - the SMF33A-HM3-08 is a unidirectional TVS diode, optimized for DC-biased lines such as automotive CAN, LIN, or analog sensor outputs. Its asymmetrical breakdown behavior makes it unsuitable for AC-coupled or bidirectional data buses. For USB or HDMI, a bidirectional array like the SMF33A-HM3-08's counterpart SMF33CA would be required - but that part is not offered in this marking variant.
Does the SMF33A-HM3-08 meet AEC-Q101 requirements for automotive use?
Yes - the SMF33A-HM3-08 is explicitly AEC-Q101 qualified, as confirmed in Vishay's Rev. 2.4 datasheet (document 85881). It passes stress tests including HBM ESD (>8 kV), temperature cycling, and high-temperature operating life, supporting deployment in engine control units, body controllers, and other under-hood or cabin modules.
What is the moisture sensitivity level (MSL) rating for the SMF33A-HM3-08?
The SMF33A-HM3-08 carries an MSL level 1 rating per J-STD-020, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without baking prior to reflow. This simplifies handling and eliminates floor-life constraints during SMT assembly - a key advantage for high-mix automotive production lines.
Can the SMF33A-HM3-08 replace the older SMAJ33A in existing designs?
Not as a direct drop-in replacement - although both suppress 33 V transients, the SMF33A-HM3-08 uses DO-219AB (3.9 mm × 1.9 mm), while SMAJ33A uses DO-214AC (4.3 mm × 3.5 mm). Layout redesign is required. Additionally, SMF33A-HM3-08 offers lower capacitance (198 pF vs. ~220 pF) and AEC-Q101 qualification, making it superior for new automotive designs but incompatible with legacy SMA footprints.
SMF33A-HM3-08 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:
- -
- Capacitance @ Frequency:
- 198pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF33A-HM3-08 FAQ
1.How can I place an order for SMF33A-HM3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF33A-HM3-08 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-HM3-08 reliable?
The price and inventory of SMF33A-HM3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF33A-HM3-08 is usually 5 days.
3.What payment methods are accepted for SMF33A-HM3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF33A-HM3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF33A-HM3-08?
SMF33A-HM3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF33A-HM3-08 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-HM3-08?
For technical support, including SMF33A-HM3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF33A-HM3-08 requirements.
6.How does Aetrix verify that SMF33A-HM3-08 is sourced from the original manufacturer or authorized distributors?
All SMF33A-HM3-08 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-HM3-08 meets industry standards.
7.What is the process for return or replacement of SMF33A-HM3-08?
All SMF33A-HM3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF33A-HM3-08, 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-HM3-08 part is unused and in its original packaging.
Return procedure for SMF33A-HM3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF33A-HM3-08 Tags
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