My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM8S24ATHE3/I
- Part No.:
- SM8S24ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S24ATHE3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM8S24ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a breakdown voltage of 26.7–29.5 V at 5 mA, clamps to ≤38.9 V at 170 A (10/1000 μs), delivers 6600 W peak pulse power, and operates up to TJ = 175 °C - making it suitable for under-hood engine control units and battery management systems.
For engineers reviewing the SM8S24ATHE3/I datasheet, SM8S24ATHE3/I pinout, SM8S24ATHE3/I application, or SM8S24ATHE3/I equivalent, key selection criteria include its DO-218AC package thermal performance (RθJC = 0.90 °C/W), AEC-Q101 qualification, ISO7637-2 compliance, unidirectional polarity with heatsink-as-anode configuration, and 24 V system-level surge immunity.
Technical Context
The SM8S24ATHE3/I employs passivated anisotropic rectifier technology optimized for high-temperature stability and low leakage (<10 μA at VWM = 24 V, TA = 25 °C; <15 μA at TJ = 175 °C). Its junction-to-case thermal resistance of 0.90 °C/W enables effective heat transfer to a PCB copper pour or external heatsink.
It is rated for 700 A non-repetitive forward surge current (8.3 ms half-sine), supports 10/1000 μs and 10/10 000 μs surge waveforms (6600 W and 5200 W respectively), and meets MSL Level 1 per J-STD-020 with 245 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 26.7 / 28.1 / 29.5 V at IT = 5 mA - defines precise clamping onset for 24 V nominal systems |
| VWM | 24.0 V - maximum continuous reverse operating voltage without significant leakage |
| VC @ IPPM | ≤38.9 V at 170 A (10/1000 μs) - ensures downstream ICs see safe transient voltage during load dump |
| PPPM (10/1000 μs) | 6600 W - sustains high-energy transients typical in 12 V/24 V automotive electrical systems |
| TJ max. | +175 °C - enables placement near hot components (e.g., power converters, ECUs) without derating |
| Polarity | Unidirectional, anode = metal heatsink - requires correct PCB layout with heatsink tied to system ground or low-impedance return |
| RθJC | 0.90 °C/W - allows accurate thermal design when mounted on ≥1 in² 2 oz copper with thermal vias |
Pinout & Package
Package: DO-218AC - thermally enhanced surface-mount case with integral metal heatsink (anode terminal), UL 94 V-0 molding compound, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (smaller tab) | Cathode | Connected to protected line (e.g., 24 V rail); carries full transient current during clamping |
| Lead 2 / metal heatsink | Anode | Must be soldered to large copper area or chassis ground; serves as primary thermal path and circuit reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JEDEC standards |
| Junction passivation | Reduces long-term parameter drift and leakage increase under high-temperature bias stress (TJ = 175 °C) |
| Low VF | ≤1.8 V at IF = 100 A (8.3 ms sine) - minimizes conduction loss during forward surge events |
| ISO7637-2 compliance | Meets Pulse 5a (load dump) requirements for 24 V systems up to 100 V/100 ms with external impedance |
| MSL Level 1 | Zero floor life limitation; supports standard SMT reflow without dry pack or baking |
Applications
| Engine Control Unit (ECU) Protection | 24 V Battery Management System (BMS) |
|---|---|
Use Scenario: Protects microcontroller I/O, CAN transceivers, and sensor interfaces from alternator load dump transients in diesel-powered commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping surges before they reach downstream regulators and logic. Use Value: Limits transient voltage to ≤38.9 V while absorbing 6600 W, preventing latch-up or permanent damage to 3.3 V/5 V logic powered from local LDOs. |
Use Scenario: Shields cell monitoring ICs and isolation amplifiers from voltage spikes during battery disconnect/reconnect in off-highway equipment. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main BMS power input, coordinated with upstream fusing and secondary TVS arrays. Use Value: Withstands repeated 10/1000 μs surges up to 170 A without degradation, supporting >10-year field life in harsh thermal environments. |
| Commercial Vehicle Lighting Control | Truck-Mounted Telematics Module |
Use Scenario: Safeguards LED driver ICs and MOSFET gate drivers against inductive kickback from solenoid-controlled headlamp actuators. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor placed directly at connector entry point on lighting control board. Use Value: Clamps within nanoseconds to ≤38.9 V, limiting dV/dt stress on driver ICs and preserving PWM timing integrity. |
Use Scenario: Provides robust front-end protection for GNSS receivers and LTE modems exposed to 24 V bus noise and load dump in fleet tracking units. IC Role / Device Role / Timing Role: First-line transient suppressor on main power input, preceding DC/DC converters and EMI filters. Use Value: Maintains ≤10 μA leakage at 24 V, avoiding quiescent current penalty critical for always-on telematics sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S24AHM3 | Same VBR/VWM/VC specs; HM3 suffix indicates halogen-free, lead-free, and whisker-resistant construction per JESD201 Class 2 | Preferred for new designs targeting RoHS+REACH+whisker mitigation; not drop-in due to different tape-and-reel packaging (HM3 uses 12 mm tape vs. HE3's 16 mm) | Select SM8S24AHM3 for new automotive programs requiring latest material compliance; SM8S24ATHE3/I remains valid for legacy production continuity. |
| SMAJ24A | Lower PPPM (400 W), smaller SMA package (RθJC ≈ 50 °C/W), VBR = 26.7–29.5 V but VC = 38.9 V only at 10.3 A (not 170 A) | Suitable for low-energy transients (e.g., ESD, relay bounce); insufficient for load dump - cannot handle 170 A surge current | Use SMAJ24A only in non-automotive, low-power applications where peak surge energy is <500 mJ; avoid for ISO7637-2 Pulse 5a. |
Compared with SM8S24ATHE3/I, SM8S24AHM3 offers identical electrical performance with enhanced material compliance for future-proofing, while SMAJ24A provides basic clamping at lower cost and size but lacks the thermal mass and surge capacity required for automotive load dump protection.
Availability
SM8S24ATHE3/I is available at Aetrix Electronics and suitable for automotive engine control units, 24 V battery management systems, commercial vehicle lighting controllers, and truck-mounted telematics modules requiring stable component supply across extended temperature and surge conditions.
Supply support for SM8S24ATHE3/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, TVS devices, and optoelectronics with emphasis on high-reliability, high-temperature, and automotive-qualified solutions.
The SM8SxxAT family was engineered specifically for demanding 24 V automotive load dump protection, combining high surge capability, AEC-Q101 qualification, and DO-218AC thermal efficiency to replace older axial or larger SMC packages in space-constrained ECUs.
FAQ
What is the maximum clamping voltage of the SM8S24ATHE3/I under standard test conditions?
The SM8S24ATHE3/I has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 μs surge current of 170 A at TC = 25 °C. This value is guaranteed per the Vishay datasheet (Doc. #87734, Rev. 21-Mar-2024) and represents the upper limit of voltage seen by protected circuitry during worst-case load dump events. The SM8S24ATHE3/I maintains this clamping performance across its full operating temperature range.
Is the SM8S24ATHE3/I qualified for automotive use?
Yes, the SM8S24ATHE3/I is AEC-Q101 qualified and explicitly intended for automotive applications. Its HE3 suffix denotes RoHS-compliant, AEC-Q101-qualified construction with JESD201 Class 2 whisker resistance. It meets ISO7637-2 Pulse 5a requirements for 24 V systems and operates reliably from –55 °C to +175 °C junction temperature - satisfying under-hood environmental demands. The SM8S24ATHE3/I is listed in Vishay's automotive-grade product portfolio.
What does the "HE3" suffix mean in SM8S24ATHE3/I?
The "HE3" suffix in SM8S24ATHE3/I indicates a RoHS-compliant, AEC-Q101-qualified version with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability requirements, plus JESD201 Class 2 whisker resistance. The "I" denotes packaging in 13-inch plastic tape and reel (750 units), with anode oriented toward sprocket holes. This suffix distinguishes it from non-automotive variants and confirms compliance with automotive manufacturing and reliability standards for the SM8S24ATHE3/I.
Can the SM8S24ATHE3/I be used in 12 V systems?
No, the SM8S24ATHE3/I is not recommended for 12 V nominal systems. Its 24 V stand-off voltage (VWM = 24.0 V) and 26.7–29.5 V breakdown range are optimized for 24 V battery architectures. Using it in a 12 V system would leave excessive margin, increasing risk of undervoltage misoperation and reducing protection sensitivity. For 12 V applications, Vishay specifies SM8S12ATHE3/I or SM8S13ATHE3/I - the SM8S24ATHE3/I is strictly intended for 24 V load dump scenarios.
What is the thermal resistance from junction to case for the SM8S24ATHE3/I?
The SM8S24ATHE3/I has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W, measured under standard test conditions per the Vishay datasheet. This low value reflects the DO-218AC package's integrated metal heatsink and enables efficient heat transfer to the PCB copper pour or external thermal plane. Proper mounting - including minimum 1 in² 2 oz copper area with ≥6 thermal vias - is required to maintain rated power dissipation and prevent thermal runaway during repetitive surge events.
SM8S24ATHE3/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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 170A
- 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
SM8S24ATHE3/I FAQ
1.How can I place an order for SM8S24ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S24ATHE3/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 SM8S24ATHE3/I reliable?
The price and inventory of SM8S24ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S24ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S24ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S24ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S24ATHE3/I?
SM8S24ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S24ATHE3/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 SM8S24ATHE3/I?
For technical support, including SM8S24ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S24ATHE3/I requirements.
6.How does Aetrix verify that SM8S24ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S24ATHE3/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 SM8S24ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S24ATHE3/I?
All SM8S24ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S24ATHE3/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 SM8S24ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S24ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S24ATHE3/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 …
