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Vishay General Semiconductor - Diodes Division SM8S16AHM3/I
- Part No.:
- SM8S16AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AC
- Datasheet:
-
SM8S16AHM3/I.pdf
- Description:
- TVS DIODE 16VWM 26VC DO218AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
SM8S16AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 16 V stand-off voltage (VWM), 17.8–19.7 V breakdown voltage (VBR) at 5 mA, 6600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SM8S16AHM3/I datasheet, SM8S16AHM3/I pinout, SM8S16AHM3/I application, or SM8S16AHM3/I equivalent, this device is selected for high-reliability 12 V automotive power rail protection where TJ = 175 °C operation, low leakage (<10 μA at VWM), and ISO7637-2 compliance are required.
Technical Context
The SM8S16AHM3/I uses passivated anisotropic rectifier technology to achieve stable clamping under repetitive surge stress. Its DO-218AB package integrates a metal heatsink as the anode terminal, enabling low thermal resistance (RθJM = 0.35 °C/W) and high surge current handling (IPPM = 254 A at 10/1000 μs).
It operates unidirectionally with a maximum clamping voltage of 26.0 V at rated IPPM, ensuring robust protection of downstream DC-DC converters and microcontrollers during load dump events. The device meets MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold for 12 V automotive rails. |
| VBR (min/typ/max) | 17.8 / 18.8 / 19.7 V at 5 mA - Confirmed breakdown range ensures predictable turn-on during transients without premature triggering. |
| VC @ IPPM | 26.0 V - Clamping voltage at 254 A peak pulse current; limits voltage seen by protected ICs during ISO7637-2 load dump. |
| PPPM (10/1000 μs) | 6600 W - Sustains high-energy surges typical of alternator load dump without degradation. |
| TJ max | +175 °C - Enables placement near heat sources (e.g., engine control units) without derating concerns. |
| ID @ VWM | <10 μA at 25 °C - Minimizes standby power loss in always-on vehicle modules. |
| Package | DO-218AB - Thermally enhanced surface-mount package with integral metal heatsink (anode) for efficient PCB heat spreading. |
Pinout & Package
DO-218AB package with two terminals: Lead 1 (cathode) and Lead 2/metal heatsink (anode). Polarity is fixed: heatsink serves as anode; cathode is marked on body. Mounting pad layout follows IPC-7351 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 (Cathode) | Transient current return path | Connected to protected circuit ground or low-side return; carries full surge current during clamping. |
| Lead 2 / Metal Heatsink (Anode) | Main power rail connection & thermal interface | Directly tied to 12 V supply rail; functions as primary thermal conduction path to PCB copper pour or heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JEDEC standards. |
| Junction passivation optimized design | Reduces parameter drift over lifetime and improves stability under high-temperature bias stress (TJ = 175 °C). |
| Meets ISO7637-2 surge specification | Withstands defined load dump waveforms (e.g., Pulse 5a) without parametric shift or failure. |
| MSL Level 1, peak reflow = 245 °C | Compatible with standard lead-free SMT reflow profiles without moisture-induced damage. |
| Low forward voltage drop | VF ≤ 1.8 V at 100 A (300 μs pulse) - minimizes conduction loss during bidirectional surge events. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Body Control Module (BCM) Supply Rail Protection |
|---|---|
Use Scenario: Protects ECU 12 V input against alternator load dump surges up to 35 V and 100 ms duration. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input filter. Use Value: Limits clamped voltage to 26.0 V, preventing overvoltage damage to LDOs and MCU power domains. |
Use Scenario: Shields BCM microcontroller and CAN transceivers from switching transients generated by window lift motors and door locks. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V distribution node feeding multiple subsystems. Use Value: Delivers 6600 W surge capability with <10 μA leakage, preserving low-power sleep mode integrity. |
| Advanced Driver Assistance Systems (ADAS) Camera Power Line | Electric Power Steering (EPS) Motor Driver Supply |
Use Scenario: Guards image sensor and ISP power inputs in rear-view or surround-view cameras exposed to vehicle-level transients. IC Role / Device Role / Timing Role: Fast-response transient suppressor located adjacent to camera module connector. Use Value: Achieves sub-100 ns response time and 26.0 V clamping to prevent pixel corruption or reset during ignition events. |
Use Scenario: Protects gate drivers and current sense amplifiers in EPS H-bridge from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: High-current TVS mounted directly on motor driver PCB near power stage. Use Value: Handles 700 A IFSM surge and dissipates 6600 W pulses without thermal runaway at TJ = 175 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM8S16AHE3_A/I | Same electrical specs and DO-218AB package; differs only in packaging suffix (HE3 vs HM3) and revision code. | No functional difference; both AEC-Q101 qualified and ISO7637-2 compliant. | Select SM8S16AHM3/I when sourcing from distributors specifying HM3 tape-and-reel configuration with anode-toward-sprocket-hole orientation. |
| SMAJ16A | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (95 °C/W), not AEC-Q101 qualified. | Suitable for non-automotive industrial or consumer applications with lower surge energy requirements. | Choose SMAJ16A only for cost-sensitive, non-automotive designs where 6600 W surge rating and 175 °C operation are unnecessary. |
Compared with SM8S16AHE3_A/I, the SM8S16AHM3/I offers identical protection performance but with HM3-specific packaging logistics; versus SMAJ16A, it delivers 16.5× higher surge power, automotive qualification, and superior thermal management-critical for under-hood deployment.
Availability
SM8S16AHM3/I is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera modules, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM8S16AHM3/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 TVS devices for automotive, industrial, and computing markets.
The SM8S series was developed specifically for AEC-Q101-compliant automotive load dump protection, emphasizing high-temperature stability, surge robustness, and thermally optimized packaging for under-hood environments.
FAQ
What is the clamping voltage of the SM8S16AHM3/I at its rated peak pulse current?
The SM8S16AHM3/I has a maximum clamping voltage (VC) of 26.0 V when subjected to its rated peak pulse current (IPPM) of 254 A using the 10/1000 μs waveform. This value is measured per standard test conditions and ensures downstream components remain within safe operating voltage limits during load dump events.
Is the SM8S16AHM3/I suitable for use in automotive under-hood applications?
Yes, the SM8S16AHM3/I is explicitly qualified to AEC-Q101 and rated for junction temperatures up to +175 °C, making it suitable for under-hood automotive applications such as engine control units and transmission control modules where ambient temperatures exceed 125 °C.
Does the SM8S16AHM3/I meet ISO7637-2 requirements?
Yes, the SM8S16AHM3/I meets the ISO7637-2 surge specification for automotive applications, including Pulse 5a (load dump), as confirmed in Vishay's official documentation and validated through standardized test conditions.
What is the polarity configuration of the SM8S16AHM3/I?
The SM8S16AHM3/I is unidirectional, with the metal heatsink serving as the anode and Lead 1 as the cathode. This configuration is fixed and marked on the device body; incorrect orientation will prevent proper transient suppression.
How does the DO-218AB package of the SM8S16AHM3/I improve thermal performance compared to standard SMB or SMA packages?
The DO-218AB package of the SM8S16AHM3/I incorporates an integrated metal heatsink that serves as the anode terminal, achieving a junction-to-mount thermal resistance (RθJM) of just 0.35 °C/W-significantly lower than SMB/SMA alternatives-enabling reliable 6600 W surge dissipation without external heatsinking.
SM8S16AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 254A
- 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
SM8S16AHM3/I FAQ
1.How can I place an order for SM8S16AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S16AHM3/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 SM8S16AHM3/I reliable?
The price and inventory of SM8S16AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S16AHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S16AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S16AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S16AHM3/I?
SM8S16AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S16AHM3/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 SM8S16AHM3/I?
For technical support, including SM8S16AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S16AHM3/I requirements.
6.How does Aetrix verify that SM8S16AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S16AHM3/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 SM8S16AHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S16AHM3/I?
All SM8S16AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S16AHM3/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 SM8S16AHM3/I part is unused and in its original packaging.
Return procedure for SM8S16AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S16AHM3/I Tags
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