My Inquiry
My Account
Vishay SMF45A-HE3_A18
- Part No.:
- SMF45A-HE3_A18
- Manufacturer:
- Vishay
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF45A-HE3_A18.pdf
- Description:
- ESD PROTECTION DIODE SMF DO219AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,421
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF45A-HE3_A18 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for robust transient voltage suppression in high-speed data lines. It features a 45 V stand-off voltage (VRWM), 72.7 V maximum clamping voltage at 2.8 A peak pulse current, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs). It is widely deployed in automotive infotainment interfaces and USB 2.0 signal lines.
For engineers reviewing the SMF45A-HE3_A18 datasheet, SMF45A-HE3_A18 pinout, SMF45A-HE3_A18 application, or SMF45A-HE3_A18 equivalent, key selection criteria include clamping voltage under 2.8 A surge, low 162 pF capacitance at 0 V, AEC-Q101 qualification status, SOD-123W-compatible footprint, and compliance with IEC 61000-4-2 contact/air discharge requirements.
Technical Context
This device operates as a single-channel unidirectional TVS diode, leveraging silicon avalanche technology to clamp transients above its reverse breakdown voltage (50–55.3 V). Its low incremental surge resistance ensures rapid response (<1 ns) and minimal voltage overshoot during ESD events.
The SMF45A-HE3_A18 is optimized for low-capacitance signal integrity preservation in high-speed digital interfaces. Its 162 pF typical junction capacitance at 0 V and 0.1 μA maximum reverse leakage at VRWM support reliable operation on 480 Mbps USB 2.0 lines without signal degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line. |
| Clamping Voltage (VC) | 72.7 V at IPPM = 2.8 A - Peak voltage seen by downstream circuitry during 10/1000 μs surge; critical for IC-level overvoltage margin. |
| Junction Capacitance (CD) | 162 pF at VR = 0 V, f = 1 MHz - Low enough to avoid signal integrity loss on USB 2.0 or CAN FD lines. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Meets automotive and industrial ESD robustness requirements without external shielding. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges common in board-level ESD events and lightning-induced coupling. |
| Operating Temp Range | −65 °C to +175 °C - Enables use in under-hood automotive modules and industrial motor drives with wide thermal cycling. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HBM >8 kV and temperature cycling, qualifying for ASIL-B subsystems. |
Pinout & Package
SMF45A-HE3_A18 uses the DO-219AB (SMF) package: low-profile (1.08 mm max height), SOD-123W-compatible outline, molded UL 94 V-0 compound, MSL Level 1, and reflow-solderable with peak temperature ≤260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side (cathode-marked end) | Connected to protected signal line; conducts during positive transients when cathode is biased higher than anode. |
| Cathode | Ground reference side | Connected to system ground or low-impedance return path; defines unidirectional clamping polarity and ESD current sink path. |
Key Features
| Feature | Design Value |
|---|---|
| "Low Noise" fast-response technology | Sub-nanosecond response time enables effective suppression of IEC 61000-4-2 ESD pulses before IC damage occurs. |
| Low incremental surge resistance | Minimizes voltage overshoot during high-di/dt transients, improving clamping precision versus standard TVS diodes. |
| AEC-Q101 qualification | Validated for automotive applications including temperature cycling, mechanical shock, and HBM ESD stress, supporting functional safety workflows. |
| SOD-123W/SOD-123F/SOD-123FL compatibility | Enables drop-in replacement in existing layouts using industry-standard low-profile SMD footprints without PCB redesign. |
Applications
| Automotive Infotainment Display Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link II video data lines between head unit and TFT display in vehicles exposed to ESD during service or user interaction. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed inline on differential signal pairs to clamp ESD-induced voltage spikes before they reach display driver ICs. Use Value: Prevents latch-up or gate oxide damage in display controllers while maintaining <162 pF capacitance to preserve signal rise/fall times at 100+ MHz. | Use Scenario: Safeguarding D+ and D− lines of USB 2.0 ports in industrial HMIs against accidental human-body ESD events during cable insertion/removal. IC Role / Device Role / Timing Role: Standoff-clamp TVS element placed immediately at connector entry point to shunt transient energy to chassis ground before reaching USB transceiver. Use Value: Maintains full-speed (480 Mbps) signal integrity with no timing jitter increase due to low 162 pF capacitance and sub-ns response. |
| Automotive Body Control Module (BCM) LIN Bus | Industrial Sensor Signal Conditioning Input |
Use Scenario: Protecting LIN bus transceivers in door modules or lighting control units from ESD and load-dump induced transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional clamping diode connected between LIN line and ground, sized to handle 45 V nominal bus voltage and tolerate 72.7 V clamping peaks. Use Value: Ensures uninterrupted LIN communication during repeated ±30 kV ESD events without bus reset or firmware corruption. | Use Scenario: Shielding analog inputs of 24-bit delta-sigma ADCs in programmable logic controllers from field-installed sensor cable ESD coupling in factory automation environments. IC Role / Device Role / Timing Role: Front-end transient suppressor on 0–10 V or 4–20 mA input channels, providing primary overvoltage defense before RC filtering and amplifier stages. Use Value: Preserves DC accuracy and noise floor by limiting leakage to ≤0.1 μA at 45 V and avoiding parasitic capacitance-induced bandwidth reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/5A | Higher clamping voltage (84.5 V at 3.2 A), larger SMA (DO-214AC) package, 200 W rating same but slower response. | Less suitable for high-speed data lines due to ~250 pF capacitance and larger footprint; better for power rail or lower-frequency analog protection. | Select SMAJ45A-E3/5A only if board space allows larger package and signal bandwidth is below 10 MHz. |
| TPD2E007DRYR | Bi-directional dual-channel array, 10 pF capacitance, 12 V VRWM, integrated ESD protection for high-speed interfaces like HDMI or USB 3.0. | Not a direct replacement: lower voltage rating, multi-channel, optimized for differential high-speed protocols-not for single-line 45 V standoff applications. | Choose TPD2E007DRYR only for new designs requiring ultra-low capacitance on differential pairs; not suitable for replacing SMF45A-HE3_A18 in existing 45 V unidirectional circuits. |
Compared with SMAJ45A-E3/5A and TPD2E007DRYR, the SMF45A-HE3_A18 uniquely balances 45 V standoff, 72.7 V clamping, 162 pF capacitance, and AEC-Q101 qualification in a compact DO-219AB package-making it optimal for automotive and industrial single-line ESD protection where space, speed, and reliability are jointly constrained.
Availability
SMF45A-HE3_A18 is available at Aetrix Electronics and suitable for automotive infotainment interfaces, USB 2.0 data line protection, and industrial sensor signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for SMF45A-HE3_A18 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 signal line protection with AEC-Q101 qualification, low capacitance, and precise clamping-designed specifically for ESD-critical interfaces in automotive ECUs and industrial I/O modules.
FAQ
What is the clamping voltage specification for SMF45A-HE3_A18 under standard test conditions?
The SMF45A-HE3_A18 has a maximum clamping voltage (VC) of 72.7 V when subjected to a 10/1000 μs surge current of 2.8 A. This value is measured per IEC 61000-4-5 and defines the peak voltage transferred to protected circuitry during transient events. The SMF45A-HE3_A18 maintains this clamping performance across its full operating temperature range of −65 °C to +175 °C.
Is SMF45A-HE3_A18 qualified to AEC-Q101, and what does that qualification cover?
Yes, SMF45A-HE3_A18 is AEC-Q101 qualified, covering stress tests including human body model (HBM) ESD ≥8 kV, temperature cycling, mechanical shock, and high-temperature operating life. This qualification confirms suitability for automotive applications such as body control modules and infotainment systems. The SMF45A-HE3_A18 meets all required failure criteria under AEC-Q101 Rev D.
What is the junction capacitance of SMF45A-HE3_A18, and how does it affect high-speed signal lines?
The SMF45A-HE3_A18 exhibits 162 pF typical junction capacitance at 0 V and 1 MHz, measured per standard test conditions. This low value minimizes signal distortion and rise-time degradation on high-speed interfaces like USB 2.0 (480 Mbps) and LIN bus. The SMF45A-HE3_A18's capacitance remains stable across reverse bias voltages up to VRWM, ensuring consistent performance in dynamic signal environments.
Does SMF45A-HE3_A18 support automated assembly processes such as reflow soldering?
Yes, SMF45A-HE3_A18 is fully compatible with standard reflow soldering processes, rated for peak temperatures up to 260 °C per J-STD-020. Its DO-219AB package is moisture sensitivity level (MSL) 1, eliminating bake requirements prior to assembly. The SMF45A-HE3_A18 also supports wave soldering and is marked with cathode polarity for automated optical inspection alignment.
How does the SMF45A-HE3_A18 compare to generic 45 V TVS diodes in terms of ESD robustness?
The SMF45A-HE3_A18 delivers ±30 kV contact and ±30 kV air discharge ESD immunity per IEC 61000-4-2-exceeding most generic 45 V TVS diodes, which typically specify only ±8 kV to ±15 kV. Its "Low Noise" avalanche structure enables sub-nanosecond response, reducing voltage overshoot during fast ESD transients. The SMF45A-HE3_A18 achieves this while maintaining AEC-Q101 qualification and 162 pF capacitance.
SMF45A-HE3_A18 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 2.8A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 162pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF45A-HE3_A18 FAQ
1.How can I place an order for SMF45A-HE3_A18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF45A-HE3_A18 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 SMF45A-HE3_A18 reliable?
The price and inventory of SMF45A-HE3_A18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF45A-HE3_A18 is usually 5 days.
3.What payment methods are accepted for SMF45A-HE3_A18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF45A-HE3_A18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF45A-HE3_A18?
SMF45A-HE3_A18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF45A-HE3_A18 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 SMF45A-HE3_A18?
For technical support, including SMF45A-HE3_A18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF45A-HE3_A18 requirements.
6.How does Aetrix verify that SMF45A-HE3_A18 is sourced from the original manufacturer or authorized distributors?
All SMF45A-HE3_A18 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 SMF45A-HE3_A18 meets industry standards.
7.What is the process for return or replacement of SMF45A-HE3_A18?
All SMF45A-HE3_A18 units undergo pre-shipment inspection (PSI). If there is an issue with SMF45A-HE3_A18, 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 SMF45A-HE3_A18 part is unused and in its original packaging.
Return procedure for SMF45A-HE3_A18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF45A-HE3_A18 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
