My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM8S43ATHE3/I
- Part No.:
- SM8S43ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S43ATHE3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,313
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM8S43ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in high-reliability 12 V/24 V systems. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown range (VBR), 6600 W peak pulse power (10/1000 μs), 175 °C junction rating, and DO-218AC package with heatsink-anode polarity.
For engineers reviewing the SM8S43ATHE3/I datasheet, SM8S43ATHE3/I pinout, SM8S43ATHE3/I application, or SM8S43ATHE3/I equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, ISO7637-2 compliance context, thermal resistance (RθJC = 0.90 °C/W), and design-meaningful clamping behavior (VC = 69.4 V at IPPM).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve low leakage (<10 μA at VWM), low forward voltage drop (≤1.8 V @ 100 A), and stable operation up to TJ = 175 °C. Its unidirectional configuration and heatsink-anode terminal assignment enable direct mounting to PCB copper planes for thermal management.
It meets MSL Level 1 per J-STD-020 (245 °C peak reflow), passes JESD201 Class 2 whisker testing, and is RoHS-compliant. The device is rated for 700 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits a positive temperature coefficient of VBR (αT = 0.093 %/°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum reverse operating voltage before clamping begins; defines system nominal bus tolerance margin |
| VBR (min/typ/max) | 47.8 / 50.3 / 52.8 V - Verified breakdown threshold at 5 mA; ensures predictable turn-on during transients |
| VC @ IPPM | 69.4 V - Clamped voltage at 95.1 A (10/1000 μs); determines maximum stress on downstream ICs |
| PPPM (10/1000 μs) | 6600 W - Peak transient energy handling capacity; supports severe automotive load dump events |
| RθJC | 0.90 °C/W - Thermal resistance from junction to case; enables effective heatsinking via PCB copper area |
| TJ max | 175 °C - Maximum junction temperature; qualifies for under-hood automotive placement |
| Polarity | Unidirectional - Anode connected to heatsink; requires correct orientation for circuit protection function |
Pinout & Package
Package: DO-218AC - Surface-mount molded case with integral metal heatsink terminal; UL 94 V-0 rated compound; matte tin-plated leads compliant with J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected line (e.g., battery rail); carries full transient current during clamping |
| Lead 2 / Metal Heatsink | Anode | Must be soldered to large copper pour for thermal dissipation; electrically tied to system ground or low-side reference |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR drift <±5% over lifetime and 175 °C operation without parameter shift |
| AEC-Q101 qualification | Validates reliability for automotive electronics including engine control units and body modules |
| Meets ISO7637-2 surge specification | Guarantees performance against standardized 12 V/24 V vehicle electrical transients (Pulse 5a/b) |
| MSL Level 1 rating | Allows single-pass reflow at 245 °C peak without popcorn or delamination risk |
| Low leakage at VWM | <10 μA @ 43 V, 25 °C - Minimizes standby power loss in always-on automotive circuits |
Applications
| Automotive Load Dump Protection | 12 V/24 V Power Rail Clamping |
|---|---|
Use Scenario: Protecting engine control unit (ECU) power input during alternator field-circuit disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECU input capacitor. Use Value: Limits transient voltage to ≤69.4 V, preventing damage to 75 V-rated DC-DC converters and microcontrollers. | Use Scenario: Safeguarding infotainment head-unit power supply against ignition-switch bounce and relay switching noise. IC Role / Device Role / Timing Role: Primary clamping device on main 12 V input, upstream of LDO regulators. Use Value: Absorbs 6600 W surges with <10 μA leakage, preserving sleep-mode current budget. |
| Under-Hood Sensor Interface Protection | Commercial Vehicle Battery Management |
Use Scenario: Shielding temperature and pressure sensor signal conditioning circuits near exhaust manifolds. IC Role / Device Role / Timing Role: Localized TVS mounted directly at connector entry point on sensor harness PCB. Use Value: Operates reliably at TJ = 175 °C ambient; clamps fast-rising transients before they reach precision amplifiers. | Use Scenario: Securing BMS front-end measurement inputs in heavy-duty truck battery packs subject to long-duration load dumps. IC Role / Device Role / Timing Role: High-energy TVS integrated into main power distribution board with thermal copper plane. Use Value: Delivers 5200 W (10/10,000 μs) capability to handle extended surge durations common in commercial fleets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S43AHM3 | Same VWM/VBR/PPPM specs; HM3 suffix indicates halogen-free molding compound and enhanced moisture sensitivity level control | Preferred for new designs requiring halogen-free compliance and tighter MSL assurance | Select SM8S43AHM3 for new automotive programs; SM8S43ATHE3/I remains valid for legacy production and repair |
| SMAJ43A | Lower PPPM (400 W), smaller SMA package (RθJC = 40 °C/W), lower IFSM (40 A) | Suitable only for low-energy transients; not qualified to AEC-Q101 or ISO7637-2 | Use SMAJ43A only in non-automotive, low-power industrial applications where cost and size outweigh robustness requirements |
Compared with SM8S43ATHE3/I, SM8S43AHM3 offers identical protection performance with updated environmental compliance, while SMAJ43A provides basic clamping in space-constrained non-automotive roles but lacks thermal, surge, and qualification margins required for vehicular use.
Availability
SM8S43ATHE3/I is available at Aetrix Electronics and suitable for automotive ECU protection, 12 V/24 V power rail clamping, and under-hood sensor interface applications requiring stable component supply across extended production lifecycles.
Supply support for SM8S43ATHE3/I 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 General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability and automotive-grade performance.
The SM8SxxAT family is engineered specifically for high-energy automotive transient suppression, targeting load dump, jump-start, and inductive switching events in demanding under-hood environments.
FAQ
What is the maximum clamping voltage of SM8S43ATHE3/I at its rated peak pulse current?
The SM8S43ATHE3/I has a maximum clamping voltage (VC) of 69.4 V when subjected to its peak pulse current (IPPM) of 95.1 A under the standard 10/1000 μs waveform. This value is measured at TC = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SM8S43ATHE3/I maintains this clamping performance across its full operating temperature range due to its stable passivated junction design.
Is SM8S43ATHE3/I qualified for automotive applications?
Yes, SM8S43ATHE3/I is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO7637-2 Pulse 5a/b load dump requirements, operates up to TJ = 175 °C, and carries the HE3 suffix indicating RoHS compliance and JESD201 Class 2 whisker resistance. These qualifications make SM8S43ATHE3/I suitable for engine control, body electronics, and ADAS power domains where reliability is critical.
What does the "HE3" suffix mean in SM8S43ATHE3/I?
The "HE3" suffix in SM8S43ATHE3/I denotes Vishay's standard automotive-grade packaging: RoHS-compliant materials, AEC-Q101 qualification, matte tin-plated leads meeting J-STD-002 solderability, and JESD201 Class 2 whisker resistance. The "I" suffix indicates packaging in 13-inch plastic tape and reel with anode oriented toward sprocket holes - a detail critical for automated placement verification. SM8S43ATHE3/I is not recommended for new designs per Vishay's notice.
How does SM8S43ATHE3/I differ from SM8S43AHM3?
SM8S43ATHE3/I and SM8S43AHM3 share identical electrical specifications (VWM, VBR, VC, PPPM, TJ max) and mechanical form factor. The key difference lies in material composition and process control: HM3 uses halogen-free molding compound and tighter MSL handling, making it preferred for new automotive designs. SM8S43ATHE3/I remains fully functional and supported for legacy production, but Vishay recommends SM8S43AHM3 for all new projects.
What thermal design guidance applies to SM8S43ATHE3/I?
SM8S43ATHE3/I has a junction-to-case thermal resistance (RθJC) of 0.90 °C/W. To maintain safe operation during repeated surges, the metal heatsink terminal (anode) must be soldered to ≥250 mm² of 2 oz copper with thermal vias to internal ground planes. Derating curves show usable power drops linearly above TC = 25 °C; at 125 °C case temperature, derated PD falls to ~4.5 W. Proper thermal design ensures SM8S43ATHE3/I sustains 175 °C junction temperature without degradation.
SM8S43ATHE3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 95.1A
- Power - Peak Pulse:
- 6600W (6.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AC
SM8S43ATHE3/I FAQ
1.How can I place an order for SM8S43ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S43ATHE3/I 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 SM8S43ATHE3/I reliable?
The price and inventory of SM8S43ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S43ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S43ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S43ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S43ATHE3/I?
SM8S43ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S43ATHE3/I 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 SM8S43ATHE3/I?
For technical support, including SM8S43ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S43ATHE3/I requirements.
6.How does Aetrix verify that SM8S43ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S43ATHE3/I 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 SM8S43ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S43ATHE3/I?
All SM8S43ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S43ATHE3/I, 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 SM8S43ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S43ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S43ATHE3/I 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 …
