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Vishay General Semiconductor - Diodes Division SM6S20AHE3_A/I
- Part No.:
- SM6S20AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM6S20AHE3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO218AB
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
SM6S20AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, rated for 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown (VBR), 4600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive load dump protection.
For engineers reviewing the SM6S20AHE3_A/I datasheet, SM6S20AHE3_A/I pinout, SM6S20AHE3_A/I application, or SM6S20AHE3_A/I equivalent, this device supports high-reliability 175 °C junction operation, low leakage (<10 μA at VWM), and ISO7637-2 compliance in engine control units and battery management systems.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge stress. Its DO-218AB package features a metal heatsink anode terminal and achieves RθJM = 0.45 °C/W for efficient thermal transfer to PCB copper.
The device operates across -55 °C to +175 °C with 0.085 %/°C VBR temperature coefficient and maintains ≤1.9 V forward voltage at 100 A (300 μs pulse), enabling robust protection of 12 V automotive electronics against load dump transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines system working voltage margin. |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V - Breakdown threshold range at 5 mA test current; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V - Clamping voltage at 142 A peak pulse current (10/1000 μs); limits protected circuit voltage stress. |
| PPPM (10/1000 μs) | 4600 W - Peak pulse power handling capacity; sustains high-energy surges without failure in automotive load dump. |
| TJ max. | +175 °C - Maximum junction temperature rating; enables placement near hot engine compartments without derating. |
| ID @ VWM (25 °C) | ≤10 μA - Low reverse leakage ensures minimal standby power loss and signal integrity in always-on modules. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
Pinout & Package
Package: DO-218AB - Surface-mount molded case with integral metal heatsink acting as anode terminal; meets UL 94 V-0, RoHS-compliant, and JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Metal Heatsink) | Positive surge return path | Direct thermal and electrical connection to PCB ground plane or heatsink; must be soldered to ≥100 mm² copper area. |
| Cathode (Lead 1) | Protected line connection | Connected to sensitive IC supply rail (e.g., MCU VDD); conducts surge current to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure reduces parameter drift over lifetime and temperature cycling. |
| MSL Level 1 | Rated for reflow up to 245 °C peak; no floor life limitation or baking required prior to assembly. |
| ISO7637-2 compliance | Validated for Pulse 5a (load dump) waveforms; clamps transients up to 40 V × 400 ms without degradation. |
| Low VF @ 100 A | ≤1.9 V forward drop enables use in series-connected protection schemes without excessive conduction loss. |
Applications
| Engine Control Unit (ECU) Power Input | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protects 12 V supply rail from alternator load dump transients during battery disconnect events. IC Role / Device Role / Timing Role: Unidirectional TVS clamps voltage spikes to <32.4 V within nanoseconds, shielding microcontrollers and CAN transceivers. Use Value: Prevents latch-up or permanent damage to downstream 3.3 V/5 V logic while maintaining AEC-Q101 qualification. |
Use Scenario: Shields LIN bus interface and power regulators from switching noise generated by door lock actuators and window motors. IC Role / Device Role / Timing Role: Fast-response TVS absorbs repetitive 100 A surges (10/1000 μs) without parameter shift over 10⁵ cycles. Use Value: Ensures >15-year field reliability in ambient temperatures up to 125 °C under hood conditions. |
| Start-Stop Battery Management System | ADAS Camera Power Supply |
Use Scenario: Guards buck converter input stage against voltage reversal and regenerative surges during engine restart. IC Role / Device Role / Timing Role: Metal heatsink anode provides low-inductance path to chassis ground, minimizing clamping delay to <1 ns. Use Value: Enables compact layout with no external heat sink needed due to RθJM = 0.45 °C/W thermal resistance. |
Use Scenario: Safeguards image sensor and ISP power rails from ESD and cable discharge events in rear-view camera modules. IC Role / Device Role / Timing Role: Low leakage (<10 μA) prevents DC bias shift on analog sensor bias lines during sleep mode. Use Value: Maintains black-level stability and eliminates pixel noise caused by leakage-induced offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM6S20AHM3 | Same VWM/VBR/PPPM specs; HM3 suffix indicates halogen-free, matte tin termination, and enhanced MSL1 reflow profile. | Identical automotive use cases; preferred for new designs where HE3 is marked "Not For New Designs". | Select SM6S20AHM3 for production ramp; SM6S20AHE3_A/I remains viable for legacy BOM continuity and repair. |
| SMAJ20A | Lower PPPM (400 W vs. 4600 W); SMA package (DO-214AC) with higher RθJA (65 °C/W vs. 55 °C/W). | Suitable only for low-energy ESD or I/O line protection-not for load dump duty. | Use SMAJ20A only in non-automotive, low-surge environments; not a functional replacement for SM6S20AHE3_A/I in power rail protection. |
Compared with SM6S20AHM3, the SM6S20AHE3_A/I offers identical electrical performance but differs in material compliance and lifecycle status; versus SMAJ20A, it delivers 11.5× higher surge energy handling and superior thermal coupling-critical for under-hood automotive deployment.
Availability
SM6S20AHE3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and start-stop battery management systems requiring stable component supply and long-term obsolescence support.
Supply support for SM6S20AHE3_A/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 SM6SxxA family was engineered specifically for AEC-Q101-compliant automotive power rail protection, emphasizing high-temperature stability, surge robustness, and DO-218AB thermal efficiency in space-constrained ECUs.
FAQ
What is the maximum clamping voltage of the SM6S20AHE3_A/I at its rated peak pulse current?
The SM6S20AHE3_A/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its peak pulse current (IPPM) of 142 A under the standard 10/1000 μs waveform. This value is measured at TC = 25 °C and guarantees that protected circuits remain below critical overvoltage thresholds during automotive load dump events. The SM6S20AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is the SM6S20AHE3_A/I qualified for automotive applications?
Yes, the SM6S20AHE3_A/I is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units and body electronics. It meets ISO7637-2 Pulse 5a requirements for load dump protection and is rated for continuous operation from -55 °C to +175 °C. The SM6S20AHE3_A/I also complies with JESD201 Class 2 whisker resistance and MSL Level 1 reflow standards.
What does the "HE3_A/I" suffix mean in SM6S20AHE3_A/I?
The "HE3_A/I" suffix in SM6S20AHE3_A/I decodes as follows: H = AEC-Q101 qualified; E3 = RoHS-compliant, halogen-free, Pb-free termination; A = ±5 % VBR tolerance and unidirectional polarity; /I = tape-and-reel packaging (750 pcs per 13″ reel, anode toward sprocket hole). The SM6S20AHE3_A/I is fully traceable and manufactured to Vishay's automotive-grade process controls.
Can the SM6S20AHE3_A/I replace the SM6S20AHM3 in existing designs?
The SM6S20AHE3_A/I and SM6S20AHM3 share identical electrical specifications, DO-218AB package, and pinout, making them functionally interchangeable in most layouts. However, HM3 denotes an updated material set (halogen-free, refined plating), while HE3 is designated "Not For New Designs." For legacy repair or continuity, SM6S20AHE3_A/I remains valid; new designs should specify SM6S20AHM3. The SM6S20AHE3_A/I requires no PCB changes when substituted.
What is the thermal resistance from junction to mount (RθJM) for the SM6S20AHE3_A/I?
The SM6S20AHE3_A/I has a typical junction-to-mount thermal resistance (RθJM) of 0.45 °C/W, measured per JEDEC 51-14 using the Transient Dual Interface Method. This low value reflects the direct metal heatsink anode contact to the PCB, enabling efficient heat transfer without external heatsinks. The SM6S20AHE3_A/I achieves this performance when mounted on ≥100 mm² of 2 oz. copper, supporting sustained 6 W power dissipation at TA = 25 °C.
SM6S20AHE3_A/I 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 142A
- Power - Peak Pulse:
- 4600W (4.6kW)
- 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
SM6S20AHE3_A/I FAQ
1.How can I place an order for SM6S20AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6S20AHE3_A/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 SM6S20AHE3_A/I reliable?
The price and inventory of SM6S20AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6S20AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SM6S20AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6S20AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6S20AHE3_A/I?
SM6S20AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6S20AHE3_A/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 SM6S20AHE3_A/I?
For technical support, including SM6S20AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6S20AHE3_A/I requirements.
6.How does Aetrix verify that SM6S20AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6S20AHE3_A/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 SM6S20AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SM6S20AHE3_A/I?
All SM6S20AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6S20AHE3_A/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 SM6S20AHE3_A/I part is unused and in its original packaging.
Return procedure for SM6S20AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6S20AHE3_A/I Tags
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