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Vishay General Semiconductor - Diodes Division SM8S30ATHE3/I
- Part No.:
- SM8S30ATHE3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S30ATHE3/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,172
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Product details
Overview
SM8S30ATHE3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AC package, rated for 33.3 V (min) to 36.8 V (max) breakdown voltage, 48.4 V clamping voltage at 136 A peak pulse current, and 6600 W peak pulse power (10/1000 μs). It delivers AEC-Q101 qualification, 175 °C junction temperature capability, and low leakage (<10 μA at 30 V), designed specifically for automotive load dump protection.
For engineers reviewing the SM8S30ATHE3/I datasheet, SM8S30ATHE3/I pinout, SM8S30ATHE3/I application, or SM8S30ATHE3/I equivalent, key selection criteria include its unidirectional polarity, heatsink-anode configuration, ISO7637-2 compliance, MSL Level 1 rating, and JESD201 Class 2 whisker resistance - all critical for high-reliability automotive power rail protection.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and surge robustness. Its DO-218AC package integrates a metal heatsink as the anode terminal, enabling efficient thermal dissipation with RθJC = 0.90 °C/W and continuous power dissipation of 8 W on infinite heatsink.
The device operates across -55 °C to +175 °C junction temperature range and exhibits a positive VBR temperature coefficient of +0.090 %/°C. It meets ISO7637-2 surge requirements under defined test conditions and supports 700 A non-repetitive forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 33.3 V / 36.8 V - defines precise voltage threshold at which avalanche conduction begins under 5 mA test current |
| VC @ IPPM | 48.4 V at 136 A - maximum clamped voltage during 10/1000 μs surge, limiting downstream IC stress |
| PPPM (10/1000 μs) | 6600 W - peak transient power handling capacity without failure under standard surge waveform |
| VWM | 30.0 V - maximum continuous reverse operating voltage before significant leakage onset |
| ID @ VWM | <10 μA at 25 °C - ensures minimal standby power loss and signal integrity in always-on automotive modules |
| TJ max | +175 °C - enables operation in engine bay and powertrain environments without derating |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: DO-218AC - surface-mount, thermally enhanced case with integrated metal heatsink; anode connected to heatsink, cathode to lead 1; RoHS-compliant matte tin plating; MSL Level 1 (245 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Cathode | Connected to protected circuit node; carries full surge current into anode during clamping |
| Heatsink (Case) | Anode | Primary thermal path and electrical return; must be soldered to large copper pour for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and temperature |
| High surge capability | 6600 W (10/1000 μs) and 5200 W (10/10000 μs) enable robust load dump and jump-start event suppression |
| Automotive qualification | AEC-Q101 certified with HE3 suffix meeting JESD201 Class 2 whisker resistance |
| Low forward voltage | VF ≤ 1.8 V at 100 A (8.3 ms sine) minimizes conduction loss during forward surge events |
| Thermal performance | RθJC = 0.90 °C/W allows effective heat transfer to PCB copper, supporting 8 W steady-state dissipation |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Battery Line Protection |
|---|---|
|
Use Scenario: Protects 12 V battery-supplied microcontroller and CAN transceivers from load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamps voltage spikes above 48.4 V while diverting up to 136 A surge current to chassis ground. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic rails and analog sensors by limiting transient overvoltage within safe margin. |
Use Scenario: Shields BCM power inputs against ISO7637-2 Pulse 5a/b load dump surges in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Fast-acting avalanche diode with 10/1000 μs response clamps within nanoseconds to protect LDOs and PMICs. Use Value: Enables compliance with automotive OEM surge immunity requirements without adding series impedance or timing delays. |
| ADAS Camera Power Rail Protection | Electric Power Steering (EPS) Motor Driver Protection |
|
Use Scenario: Safeguards image sensor and ISP power supplies in rear-view and surround-view cameras exposed to battery line transients. IC Role / Device Role / Timing Role: Standoff voltage of 30.0 V permits normal 12 V system operation while clamping surges >48.4 V. Use Value: Maintains uninterrupted video stream during ignition cycling and alternator load changes due to low leakage (<10 μA). |
Use Scenario: Protects gate drivers and current sense amplifiers in EPS motor control units from inductive switching spikes and load dump. IC Role / Device Role / Timing Role: Metal heatsink anode provides direct thermal path to PCB ground plane, sustaining repeated 6600 W surges. Use Value: Eliminates need for external heatsinks or derating in space-constrained EPS enclosures operating up to 175 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S30AHM3 | Same VBR, VC, and PPPM; HM3 suffix indicates halogen-free molding compound and different tape/reel packaging (750 pcs vs. 750 pcs); identical DO-218AC mechanical form | Approved for new designs per Vishay documentation; replaces HE3 in future automotive programs requiring halogen-free compliance | Select SM8S30AHM3 for new designs requiring halogen-free materials and long-term supply continuity. |
| SMAJ33A | Lower PPPM (400 W), smaller SMA package (RθJC ≈ 45 °C/W), VBR = 36.7–40.6 V, VC = 53.3 V at 7.5 A - significantly lower surge capacity and thermal performance | Suitable only for low-energy transients (e.g., ESD, minor switching noise); not compliant with ISO7637-2 load dump | Use SMAJ33A only in non-automotive, low-power applications where 6600 W surge capability is unnecessary. |
Compared with SM8S30ATHE3/I, SM8S30AHM3 offers identical electrical and thermal performance with updated environmental compliance, while SMAJ33A provides substantially lower surge robustness and thermal management - making it unsuitable for automotive load dump protection despite similar nominal voltage rating.
Availability
SM8S30ATHE3/I is available at Aetrix Electronics and suitable for automotive ECU power input protection, body control module battery line hardening, and ADAS camera power rail stabilization requiring stable component supply and AEC-Q101 traceability.
Supply support for SM8S30ATHE3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM8SxxAT family was engineered specifically for automotive load dump protection, combining high-temperature operation (175 °C), ISO7637-2 compliance, and DO-218AC thermal efficiency to replace legacy TVS solutions in next-generation power systems.
FAQ
What is the clamping voltage of SM8S30ATHE3/I at its rated peak pulse current?
The SM8S30ATHE3/I has a maximum clamping voltage (VC) of 48.4 V when subjected to its specified peak pulse current of 136 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and ensures downstream circuitry remains within safe operating limits during surge events. The SM8S30ATHE3/I maintains this clamping performance across its full operating temperature range.
Is SM8S30ATHE3/I qualified for automotive applications?
Yes, SM8S30ATHE3/I is AEC-Q101 qualified and explicitly intended for automotive use, including engine control units and body electronics. Its DO-218AC package, 175 °C junction rating, ISO7637-2 surge compliance, and JESD201 Class 2 whisker resistance confirm suitability for under-hood and safety-critical systems. The HE3 suffix denotes RoHS compliance and automotive qualification.
What does the "HE3" suffix mean in SM8S30ATHE3/I?
The "HE3" suffix in SM8S30ATHE3/I indicates RoHS-compliant construction, AEC-Q101 qualification, and compliance with JESD201 Class 2 whisker testing. It also specifies packaging in 13-inch plastic tape and reel (750 units per reel), with anode oriented toward sprocket holes. This suffix distinguishes it from non-automotive variants and confirms suitability for high-reliability production.
Can SM8S30ATHE3/I be used in bidirectional configurations?
No, SM8S30ATHE3/I is unidirectional only, with polarity defined as anode-to-heatsink and cathode-to-lead 1. It is not rated for reverse surge conduction. For bidirectional protection, two SM8S30ATHE3/I devices must be connected in series opposition - but Vishay does not recommend this configuration due to mismatched VBR tolerance and thermal imbalance. Use dedicated bidirectional TVS parts instead.
What is the thermal resistance from junction to case for SM8S30ATHE3/I?
The SM8S30ATHE3/I has a typical junction-to-case thermal resistance (RθJC) of 0.90 °C/W, measured under standard conditions. This low value is enabled by the DO-218AC package's metal heatsink anode, which provides direct thermal conduction to the PCB copper pour. Proper layout with ≥250 mm² of 2 oz copper is required to realize full 8 W steady-state power dissipation capability.
SM8S30ATHE3/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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 136A
- 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
SM8S30ATHE3/I FAQ
1.How can I place an order for SM8S30ATHE3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S30ATHE3/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 SM8S30ATHE3/I reliable?
The price and inventory of SM8S30ATHE3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S30ATHE3/I is usually 5 days.
3.What payment methods are accepted for SM8S30ATHE3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S30ATHE3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S30ATHE3/I?
SM8S30ATHE3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S30ATHE3/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 SM8S30ATHE3/I?
For technical support, including SM8S30ATHE3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S30ATHE3/I requirements.
6.How does Aetrix verify that SM8S30ATHE3/I is sourced from the original manufacturer or authorized distributors?
All SM8S30ATHE3/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 SM8S30ATHE3/I meets industry standards.
7.What is the process for return or replacement of SM8S30ATHE3/I?
All SM8S30ATHE3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S30ATHE3/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 SM8S30ATHE3/I part is unused and in its original packaging.
Return procedure for SM8S30ATHE3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S30ATHE3/I Tags
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