My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMF43A-E3-08
- Part No.:
- SMF43A-E3-08
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-219AB
- Datasheet:
-
SMF43A-E3-08.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMF
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF43A-E3-08 from Vishay Semiconductors is a unidirectional surface-mount ESD protection diode in the SMF (DO-219AB) package, designed for clamping transient overvoltages on DC power and signal lines. It features a 43 V stand-off voltage (VRWM), 69.4 V maximum reverse clamping voltage at 2.9 A peak pulse current, 165 pF typical capacitance at 0 V, ±30 kV IEC 61000-4-2 ESD immunity, and 200 W peak pulse power (10/1000 μs).
For engineers reviewing the SMF43A-E3-08 datasheet, SMF43A-E3-08 pinout, SMF43A-E3-08 application, or SMF43A-E3-08 equivalent, this device is selected for high-reliability ESD suppression in automotive infotainment interfaces, industrial sensor I/O lines, and USB 2.0 data paths where low clamping voltage and sub-170 pF capacitance are critical to signal integrity.
Technical Context
This unidirectional TVS diode operates as a shunt-type transient suppressor, leveraging silicon avalanche breakdown to clamp fast-rising ESD transients before they reach downstream ICs. Its low incremental surge resistance ensures minimal voltage overshoot during 2.9 A IPPM events, while its DO-219AB package enables compact PCB layout with MSL level 1 moisture sensitivity and 260 °C reflow compatibility.
The device meets AEC-Q101 qualification for automotive applications and delivers stable performance across -65 °C to +175 °C operating temperature range. Its 165 pF junction capacitance at 0 V and 0.1 μA max reverse leakage at VRWM support use in moderate-speed digital interfaces without significant signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 43 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines safe operating margin below system rail. |
| Reverse Clamping Voltage (VC) | 69.4 V at 2.9 A - Peak voltage seen across protected line during worst-case 10/1000 μs surge; determines downstream IC stress level. |
| Junction Capacitance (CD) | 165 pF at 0 V, 1 MHz - Limits high-frequency signal attenuation and timing skew in data lines like CAN or USB 2.0. |
| ESD Immunity | ±30 kV contact / ±30 kV air per IEC 61000-4-2 - Validates robustness against human-body and proximity discharge events. |
| Peak Pulse Power | 200 W (10/1000 μs) - Sustains short-duration surges common in board-level ESD events without degradation. |
| Operating Temperature | -65 °C to +175 °C - Supports under-hood automotive, industrial control, and wide-temperature embedded deployments. |
| AEC-Q101 Qualified | Yes - Confirmed reliability for automotive electronics per stress-test standard including HBM >8 kV. |
Pinout & Package
SMF43A-E3-08 uses the DO-219AB (SMF) package: low-profile, surface-mount, single-diode configuration with cathode marking bar. Dimensions: 3.9 mm × 1.9 mm × 1.08 mm (L × W × H). Compatible with wave and reflow soldering (peak 260 °C); MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected signal or power line; conducts surge current toward cathode during overvoltage event. |
| Cathode | Ground/reference terminal | Connected to system ground or low-impedance return path; establishes clamping reference and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | 69.4 V at 2.9 A ensures downstream ICs remain below absolute maximum ratings during ESD strikes. |
| "Low Noise" fast response | Sub-nanosecond turn-on time minimizes voltage overshoot before clamping engages. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HBM, and mechanical shock testing. |
| SOD-123W footprint compatibility | Enables drop-in replacement in existing layouts designed for similar SOD-123W packages without redesign. |
| 165 pF capacitance | Preserves signal rise/fall times in 480 Mbps USB 2.0 and 1 Mbps CAN FD interfaces. |
Applications
| Automotive Infotainment Display Interface | Industrial RS-485 Sensor Node |
|---|---|
Use Scenario: Protecting LVDS or FPD-Link III video data lines between head unit and display panel against ESD during service or assembly. IC Role / Device Role / Timing Role: Shunt clamping element placed directly at connector entry point to limit transient voltage before reaching serializer/deserializer ICs. Use Value: Prevents latch-up or gate oxide damage in display driver ICs by limiting clamped voltage to ≤69.4 V during ±30 kV contact discharge. |
Use Scenario: Safeguarding RS-485 transceiver I/O pins in factory-floor temperature sensors exposed to static buildup on metal enclosures. IC Role / Device Role / Timing Role: Bidirectional protection (used in unidirectional configuration with ground reference) on A/B differential lines to suppress ESD-induced common-mode spikes. Use Value: Maintains bus communication integrity by limiting transceiver input voltage excursion to <70 V, avoiding false triggering or shutdown. |
| USB 2.0 Host Port Protection | DC Power Rail Surge Suppression |
Use Scenario: ESD protection on D+ and D- lines of automotive USB host ports subject to frequent cable insertion/removal. IC Role / Device Role / Timing Role: Low-capacitance (165 pF) unidirectional TVS placed adjacent to USB connector to preserve 480 Mbps eye diagram integrity. Use Value: Enables full-speed USB compliance by limiting added capacitance to <200 pF while delivering ±30 kV ESD immunity. |
Use Scenario: Clamping load-dump and jump-start transients on 48 V auxiliary power rails in commercial vehicle telematics modules. IC Role / Device Role / Timing Role: Primary shunt protector on input rail upstream of DC/DC converter, sized for 200 W 10/1000 μs surge handling. Use Value: Absorbs up to 2.9 A surge current without failure, preventing overvoltage propagation to sensitive PMICs and microcontrollers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SP3205-01UTG | Unidirectional, 43 V VRWM, 120 pF capacitance, 30 kV ESD rating, SOD-323 package (smaller footprint, lower power rating: 150 W). | Better suited for space-constrained portable electronics; lower clamping voltage (62 V) but reduced surge handling (2.2 A). | Select when board area is limited and peak surge current remains below 2.2 A; verify thermal derating for repeated events. |
| ON Semiconductor SZ1.5SMC43A | Unidirectional, 43 V VRWM, 200 W rating, DO-214AB package (larger, higher thermal mass), 170 pF capacitance. | Preferred for higher-energy transients (e.g., ISO 7637-2 load dump) due to larger case and higher RthJA margin. | Choose for industrial power supply inputs requiring enhanced thermal robustness and legacy DO-214AB compatibility. |
Compared with SMF43A-E3-08, SP3205-01UTG offers tighter capacitance and smaller size but sacrifices surge current capacity, while SZ1.5SMC43A trades board space for superior thermal dissipation and higher surge endurance-making SMF43A-E3-08 the optimal balance of low profile, 165 pF, and 2.9 A clamping for automotive and industrial signal-line protection.
Availability
SMF43A-E3-08 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor networks, and USB 2.0 peripheral interfaces requiring stable component supply, AEC-Q101 compliance, and consistent ESD protection performance across production batches.
Supply support for SMF43A-E3-08 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 board-level ESD protection with optimized clamping, low capacitance, and AEC-Q101 qualification-designed specifically for safeguarding high-speed data lines and power rails in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of the SMF43A-E3-08 under a 10/1000 μs surge?
The SMF43A-E3-08 has a maximum reverse clamping voltage (VC) of 69.4 V when subjected to a 2.9 A peak pulse current with a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table of the Vishay datasheet (Document Number: 85881, Rev. 2.4) and represents the highest voltage that appears across the device during standardized surge testing-critical for ensuring downstream ICs remain within safe operating limits. The SMF43A-E3-08 maintains this clamping performance across its full operating temperature range.
Is SMF43A-E3-08 suitable for automotive applications?
Yes, SMF43A-E3-08 is AEC-Q101 qualified and rated for operation from -65 °C to +175 °C, making it suitable for under-hood and cabin automotive applications. It delivers ±30 kV ESD immunity per IEC 61000-4-2 and supports human body model (HBM) ESD tolerance greater than 8 kV-key requirements for infotainment, ADAS sensor interfaces, and body control modules. The SMF43A-E3-08 meets these specifications without derating, and its DO-219AB package supports automated assembly in automotive-grade production lines.
What is the junction capacitance of SMF43A-E3-08 and how does it affect signal integrity?
The SMF43A-E3-08 exhibits a typical junction capacitance (CD) of 165 pF measured at 0 V and 1 MHz. This value is low enough to avoid significant signal attenuation or timing skew on moderate-speed digital lines such as USB 2.0 (480 Mbps) and RS-485 (up to 10 Mbps), while still providing robust ESD clamping. At higher frequencies, capacitance decreases with applied reverse bias-e.g., dropping to ~40 pF at 20 V-allowing the SMF43A-E3-08 to maintain signal fidelity without compromising protection strength.
Does SMF43A-E3-08 have a unidirectional or bidirectional configuration?
The SMF43A-E3-08 is a unidirectional TVS diode, configured as a single avalanche junction with anode and cathode terminals. Its electrical characteristics-including reverse breakdown voltage (VBR min/max), stand-off voltage (VRWM), and clamping behavior-are defined only for reverse-biased operation. It is not rated for bidirectional surge suppression; using it in bidirectional configurations requires pairing with a second device or selecting a dedicated bidirectional variant such as SMF43CA. The SMF43A-E3-08 marking code "CT" and datasheet designation confirm its unidirectional identity.
What packaging and soldering conditions apply to SMF43A-E3-08?
SMF43A-E3-08 is supplied in 3K per 7" reel (8 mm tape, MOQ = 30K) and complies with MSL level 1 per J-STD-020, meaning it is not moisture-sensitive and requires no baking prior to assembly. It supports both wave and reflow soldering, with a maximum peak reflow temperature of 260 °C. The DO-219AB package has a recommended footprint of 2.9 mm × 1.4 mm pad dimensions and 1.3 mm solder mask opening per side, as specified in Vishay's package drawing S8-V-3915.01-001. These parameters ensure reliable attachment without tombstoning or voiding for the SMF43A-E3-08.
SMF43A-E3-08 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 165pF @ 1MHz
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AB (SMF)
SMF43A-E3-08 FAQ
1.How can I place an order for SMF43A-E3-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF43A-E3-08 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 SMF43A-E3-08 reliable?
The price and inventory of SMF43A-E3-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF43A-E3-08 is usually 5 days.
3.What payment methods are accepted for SMF43A-E3-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF43A-E3-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF43A-E3-08?
SMF43A-E3-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF43A-E3-08 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 SMF43A-E3-08?
For technical support, including SMF43A-E3-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF43A-E3-08 requirements.
6.How does Aetrix verify that SMF43A-E3-08 is sourced from the original manufacturer or authorized distributors?
All SMF43A-E3-08 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 SMF43A-E3-08 meets industry standards.
7.What is the process for return or replacement of SMF43A-E3-08?
All SMF43A-E3-08 units undergo pre-shipment inspection (PSI). If there is an issue with SMF43A-E3-08, 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 SMF43A-E3-08 part is unused and in its original packaging.
Return procedure for SMF43A-E3-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF43A-E3-08 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 …
