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Vishay General Semiconductor - Diodes Division SM8S24A-71HE4_A/J
- Part No.:
- SM8S24A-71HE4_A/J
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S24A-71HE4_A/J.pdf
- Description:
- TVS DIODE 24VWM DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,470
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Product details
Overview
SM8S24A-71HE4_A/J from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, designed for automotive load dump protection with 24 V stand-off voltage (VWM), 28.1 V nominal breakdown voltage (VBR), and 6600 W peak pulse power (10/1000 μs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified.
For engineers reviewing the SM8S24A-71HE4_A/J datasheet, SM8S24A-71HE4_A/J pinout, SM8S24A-71HE4_A/J application, or SM8S24A-71HE4_A/J equivalent, key selection criteria include its 38.9 V clamping voltage at 170 A IPPM, low leakage (<10 μA at VWM), and compliance with ISO7637-2 surge testing - critical for 12 V automotive power rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low forward voltage drop (≤1.8 V at 100 A). Its junction-to-mount thermal resistance is 0.35 °C/W, enabling effective heat transfer to a heatsink - essential for sustained surge handling in engine control units.
The device features unidirectional polarity with anode connected to the metal heatsink, and meets MSL Level 1 per J-STD-020 with 245 °C lead-free reflow capability. Its 0.087 %/°C temperature coefficient of VBR ensures predictable breakdown drift over temperature in automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24.0 V - maximum continuous reverse operating voltage before clamping begins; defines system operating margin in 12 V automotive networks. |
| VBR (nom) | 28.1 V - nominal breakdown voltage at 5 mA test current; triggers clamping during transients while avoiding false triggering during normal operation. |
| VC @ IPPM | 38.9 V - clamping voltage at 170 A peak pulse current (10/1000 μs); limits downstream IC stress during load dump events. |
| PPPM (10/1000 μs) | 6600 W - peak pulse power rating; supports robust protection against ISO7637-2 Pulse 5a (load dump) surges. |
| TJ max | +175 °C - maximum junction temperature; enables reliable operation in high-ambient under-hood applications without derating. |
| ID @ VWM | <10 μA - reverse leakage at stand-off voltage; minimizes quiescent power loss in always-on vehicle modules. |
| RθJM | 0.35 °C/W - thermal resistance from junction to metal heatsink; allows direct mounting to chassis or PCB copper pour for efficient thermal management. |
Pinout & Package
Package: DO-218AB - surface-mount, anode-connected metal heatsink case with matte tin-plated leads, UL 94 V-0 molding compound, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | Current entry point during clamping | Must be soldered to large copper area or chassis for thermal conduction and low-inductance path to ground reference. |
| Cathode (Lead 1) | Current exit point during clamping | Connected to protected line (e.g., battery rail); forms low-impedance path to ground via heatsink during surge. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive electronics including extended temperature cycling, humidity, and mechanical shock per automotive standards. |
| Junction passivation | Stable VBR performance over lifetime and temperature; prevents parameter drift due to moisture ingress or contamination. |
| ISO7637-2 compliance | Meets Pulse 5a (load dump) requirements up to 35 V test voltage, ensuring immunity to alternator-induced surges in 12 V systems. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 245 °C peak without popcorn cracking or delamination. |
| Low clamping ratio (VC/VBR) | 1.38 - tight ratio between clamping and breakdown voltages; maximizes design margin between operating and protection thresholds. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Rail Protection |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and sensors from load dump transients during alternator regulation failure in gasoline/diesel engines. IC Role / Device Role / Timing Role: Unidirectional TVS clamps 35–40 V surges within nanoseconds to limit rail voltage to ≤38.9 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies downstream of DC-DC converters fed from unprotected battery lines. |
Use Scenario: Shields door module, lighting, and HVAC controllers from repeated switching surges caused by high-current solenoids and motors. IC Role / Device Role / Timing Role: Absorbs repetitive 10/1000 μs pulses up to 6600 W without degradation, maintaining stable VWM over 1000+ cycles. Use Value: Eliminates need for external series resistors or RC snubbers, reducing BOM count and PCB space in distributed body electronics. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Supply | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Safeguards image sensor and ISP power rails in front/rear-view cameras exposed to harsh under-hood or bumper environments. IC Role / Device Role / Timing Role: Responds in <1 ns to fast-rising transients (dv/dt > 100 V/ns), clamping before downstream LDOs or PMICs enter overvoltage shutdown. Use Value: Maintains camera uptime during ignition transients and jump-start events, supporting ASIL-B functional safety requirements. |
Use Scenario: Protects H-bridge gate drivers and current sense amplifiers from inductive kickback when EPS motor commutates at high torque. IC Role / Device Role / Timing Role: Handles 700 A IFSM single half-sine surge (8.3 ms), surviving repeated motor stall conditions without parametric shift. Use Value: Enables compact, high-power EPS designs without discrete MOVs or hybrid protection, meeting OEM EMC and longevity targets. |
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 VWM (24 V), VBR (28.1 V), and DO-218AB package; differs in marking suffix (HM3 vs HE4_A/J) and revision code; identical electrical specs and AEC-Q101 qualification. | No functional difference; HM3 variant uses updated internal process but maintains full form-fit-function compatibility. | Select SM8S24AHM3 for new designs where Vishay recommends migration from legacy HE3/HE4 part numbers. |
| SMAJ24A | Lower PPPM (400 W vs 6600 W), smaller SMA package (vs DO-218AB), higher RθJA (100 °C/W vs 55 °C/W); not AEC-Q101 qualified. | Suitable only for low-energy industrial or consumer surges; cannot withstand automotive load dump per ISO7637-2. | Use SMAJ24A only in non-automotive, low-surge environments where cost and board space outweigh reliability requirements. |
Compared with SM8S24A-71HE4_A/J, SM8S24AHM3 offers identical protection performance with updated manufacturing traceability, while SMAJ24A provides basic TVS functionality at lower cost but lacks the thermal robustness, surge capacity, and automotive qualification required for vehicle power systems.
Availability
SM8S24A-71HE4_A/J is available at Aetrix Electronics and suitable for automotive ECU, BCM, ADAS camera, and EPS applications requiring stable component supply across long production lifecycles and high-temperature operating conditions.
Supply support for SM8S24A-71HE4_A/J 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM8SxxA family is engineered specifically for automotive-grade transient suppression, targeting load dump and inductive switching protection in 12 V and 24 V vehicle electrical systems with extended temperature and reliability demands.
FAQ
What is the clamping voltage of SM8S24A-71HE4_A/J at its rated peak pulse current?
The SM8S24A-71HE4_A/J has a maximum clamping voltage (VC) of 38.9 V at 170 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and ensures downstream circuitry remains within safe operating limits during ISO7637-2 load dump events. The SM8S24A-71HE4_A/J achieves this with minimal voltage overshoot due to its low dynamic impedance.
Is SM8S24A-71HE4_A/J suitable for 24 V commercial vehicle applications?
Yes, the SM8S24A-71HE4_A/J is rated for 24 V nominal systems with 24.0 V stand-off voltage (VWM) and 38.9 V clamping - well within typical 24 V truck/bus battery rail tolerances. Its 175 °C junction rating and AEC-Q101 qualification make it appropriate for heavy-duty vehicle ECUs, though system-level validation against ISO16750-2 is recommended. The SM8S24A-71HE4_A/J maintains stable parameters across the full temperature range.
Does SM8S24A-71HE4_A/J require a heatsink for standard automotive operation?
The SM8S24A-71HE4_A/J integrates a metal heatsink as its anode terminal and is designed to be soldered directly to a large PCB copper pour or chassis ground plane - no external heatsink is needed for transient suppression duty. Its RθJM of 0.35 °C/W enables efficient heat transfer during short-duration surges. For continuous power dissipation, however, the SM8S24A-71HE4_A/J is limited to 8 W on infinite heatsink at 25 °C ambient.
How does SM8S24A-71HE4_A/J differ from SM8S24AHM3?
The SM8S24A-71HE4_A/J and SM8S24AHM3 share identical electrical specifications, package (DO-218AB), thermal performance, and AEC-Q101 qualification. The difference lies in internal process revision and marking suffix: HM3 reflects Vishay's updated manufacturing flow with enhanced traceability, while HE4_A/J denotes earlier production. Both are functionally interchangeable; Vishay recommends SM8S24AHM3 for new designs per their "Not For New Designs" notice for HE3/HE4 variants.
Can SM8S24A-71HE4_A/J be used in bidirectional configurations?
No, the SM8S24A-71HE4_A/J is unidirectional only, with polarity defined by anode-to-heatsink connection. It conducts only during positive transients relative to ground. For bidirectional protection (e.g., AC lines or differential buses), two SM8S24A-71HE4_A/J devices must be used in series-opposing configuration, or a dedicated bidirectional TVS such as SMBJ24CA should be selected instead.
SM8S24A-71HE4_A/J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-218AB
SM8S24A-71HE4_A/J FAQ
1.How can I place an order for SM8S24A-71HE4_A/J through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S24A-71HE4_A/J 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 SM8S24A-71HE4_A/J reliable?
The price and inventory of SM8S24A-71HE4_A/J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S24A-71HE4_A/J is usually 5 days.
3.What payment methods are accepted for SM8S24A-71HE4_A/J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S24A-71HE4_A/J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S24A-71HE4_A/J?
SM8S24A-71HE4_A/J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S24A-71HE4_A/J 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 SM8S24A-71HE4_A/J?
For technical support, including SM8S24A-71HE4_A/J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S24A-71HE4_A/J requirements.
6.How does Aetrix verify that SM8S24A-71HE4_A/J is sourced from the original manufacturer or authorized distributors?
All SM8S24A-71HE4_A/J 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 SM8S24A-71HE4_A/J meets industry standards.
7.What is the process for return or replacement of SM8S24A-71HE4_A/J?
All SM8S24A-71HE4_A/J units undergo pre-shipment inspection (PSI). If there is an issue with SM8S24A-71HE4_A/J, 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 SM8S24A-71HE4_A/J part is unused and in its original packaging.
Return procedure for SM8S24A-71HE4_A/J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S24A-71HE4_A/J Tags
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