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Vishay General Semiconductor - Diodes Division 1.5SMC20AHM3/I
- Part No.:
- 1.5SMC20AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC20AHM3/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,518
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Product details
Overview
1.5SMC20AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 17.1 V stand-off voltage (VWM), 19.0–21.0 V breakdown voltage (VBR) at 1 mA, 27.7 V maximum clamping voltage (VC) at 54.2 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 μs waveform - ideal for automotive sensor line protection against ESD and load dump transients.
For engineers reviewing the 1.5SMC20AHM3/I datasheet, 1.5SMC20AHM3/I pinout, 1.5SMC20AHM3/I application, or 1.5SMC20AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), polarity marking convention, and real-world use cases in automotive and industrial signal-line protection.
Technical Context
The 1.5SMC20AHM3/I operates as a unidirectional avalanche diode, clamping transient voltages above its breakdown threshold while maintaining low leakage (<1.0 μA at 17.1 V) under normal operation. Its glass-passivated junction ensures stable performance and fast response time (<1.0 ns), critical for suppressing ESD events per IEC 61000-4-2 and lightning-induced surges per IEC 61000-4-5.
Designed for surface-mount assembly on standard PCB copper pads (8.0 mm × 8.0 mm per terminal), it supports automated placement and meets J-STD-020 MSL Level 1 (peak reflow ≤260 °C). The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.1 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal-line operating margin. |
| VBR (min/max) | 19.0 V / 21.0 V at 1 mA - Verified avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 27.7 V at 54.2 A - Clamped voltage during 10/1000 μs surge; determines protected IC's maximum stress level. |
| PPPM | 1500 W - Peak pulse power handling; enables suppression of high-energy transients without failure. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs board-level thermal design for sustained power dissipation. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| IFSM | 200 A - Peak forward surge current (8.3 ms half-sine); validates robustness against repetitive inductive switching events. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end; anode and cathode terminals are non-reversible for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or lower-potential rail; enables clamping when cathode-side voltage exceeds VBR. |
| Cathode | Current exit point during forward conduction; marked with band | Connected to protected signal line; voltage referenced to anode; defines clamping polarity and directionality. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces under temperature cycling, humidity, and mechanical shock stress. |
| 1500 W peak pulse power (10/1000 μs) | Enables single-device protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 Level 3 surges without derating. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving clamping accuracy and downstream IC survivability. |
| MSL Level 1 moisture sensitivity | Allows direct placement without baking; compatible with standard lead-free reflow profiles up to 260 °C peak. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive OEM environmental requirements and supports sustainable manufacturing compliance (e.g., VW 80101). |
Applications
| Automotive Sensor Signal Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine compartments exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor output and ground, clamping transients before they reach the ADC input of the ECU. Use Value: Maintains signal integrity under ±100 V/500 ms load dump (ISO 7637-2) while adding <0.5 pF capacitance to avoid bandwidth degradation. |
Use Scenario: Safeguarding CAN_H and CAN_L lines in factory automation controllers subjected to ESD and inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (one per line) referenced to ground, absorbing common-mode surges without disrupting differential signaling. Use Value: Limits clamping voltage to <30 V during 30 A/10/1000 μs transients, preserving CAN physical layer compliance (ISO 11898-2) and bit error rate. |
| Consumer Power Adapter Input Stage | Telecom Ethernet Port Surge Protection |
|
Use Scenario: Secondary-side DC input protection in USB-C PD adapters where 24 V rails interface with microcontroller monitoring circuits. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between 24 V rail and GND, acting as last-line defense after primary MOV and fuse stages. Use Value: Responds in <1 ns to fast ESD events (IEC 61000-4-2 ±8 kV contact), preventing latch-up in supervisor ICs without affecting steady-state regulation. |
Use Scenario: Front-end protection of PoE-powered Ethernet PHYs in network switches exposed to lightning-induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Unidirectional TVS on each data pair (TX+/TX−, RX+/RX−), referenced to chassis ground to shunt common-mode energy. Use Value: Withstands 1500 W surges per line while maintaining <1.5 pF junction capacitance, ensuring 100BASE-TX signal integrity up to 125 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/57T | Same VWM (17.1 V) and VC (27.7 V), but lower PPPM (400 W) and smaller SMA package (DO-214AC); RθJA = 110 °C/W. | Not AEC-Q101 qualified; limited to commercial-grade consumer/industrial use; unsuitable for under-hood automotive. | Select when cost or board space is constrained and automotive qualification is not required. |
| 1.5KE20A | Through-hole TO-204AA (DO-41) package; identical VWM/VBR/VC, but higher RθJA (60 °C/W on infinite heatsink only); no AEC-Q101 option. | Requires through-hole assembly and larger PCB footprint; lacks surface-mount compatibility and automotive reliability validation. | Choose only for legacy through-hole designs where rework to SMD is impractical. |
Compared with SMAJ20A-E3/57T and 1.5KE20A, the 1.5SMC20AHM3/I uniquely combines AEC-Q101 qualification, 1500 W surge rating, SMC package thermal efficiency (RθJA = 75 °C/W), and halogen-free compliance - making it the only drop-in solution for new automotive signal-line protection designs requiring zero layout change and full regulatory alignment.
Availability
1.5SMC20AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interfaces, and telecom Ethernet port surge suppression requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5SMC20AHM3/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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The 1.5SMC Series was engineered for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, AEC-Q101 compliance, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC20AHM3/I at its rated peak pulse current?
The 1.5SMC20AHM3/I has a maximum clamping voltage (VC) of 27.7 V at its rated peak pulse current (IPPM) of 54.2 A, measured using the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is guaranteed across the full operating temperature range (−65 °C to +150 °C). The 1.5SMC20AHM3/I maintains this clamping performance without degradation under repetitive surge conditions at 0.01 % duty cycle.
Is the 1.5SMC20AHM3/I qualified for automotive applications?
Yes, the 1.5SMC20AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and Vishay documentation (Document Number: 88303, Revision: 09-Mar-2026). This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing (uHAST), validating its suitability for under-hood and body-control module applications. The 1.5SMC20AHM3/I is explicitly listed in Vishay's AEC-Q101 qualified product table for the 1.5SMC series with revision code "A".
What does the "HM3" suffix mean in 1.5SMC20AHM3/I?
The "HM3" suffix in 1.5SMC20AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" denotes halogen-free molding compound, "M3" confirms RoHS compliance and JESD201 Class 2 whisker resistance, and the "/I" denotes packaging in 13-inch tape-and-reel format (3500 units per reel). This suffix replaces older "HE3" (RoHS + AEC-Q101, non-halogen-free) and "E3" (RoHS-only) variants, meeting Tier-1 automotive environmental requirements.
How does the 1.5SMC20AHM3/I compare to bidirectional TVS diodes like 1.5SMC20CA?
The 1.5SMC20AHM3/I is unidirectional and optimized for DC-biased lines where polarity is fixed (e.g., sensor outputs referenced to ground), offering lower leakage (<1.0 μA at VWM) and tighter VBR tolerance than bidirectional equivalents. In contrast, 1.5SMC20CA provides symmetrical clamping for AC or floating lines but exhibits higher reverse leakage and reduced surge margin in polarized configurations. For automotive LIN or CAN lines with defined ground reference, the 1.5SMC20AHM3/I delivers superior noise immunity and lower standby power loss.
What is the thermal resistance and recommended pad layout for the 1.5SMC20AHM3/I?
The 1.5SMC20AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout: 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. This layout maximizes heat dissipation during repetitive surge events and ensures reliable operation at full 1500 W rating. Reducing pad area increases RθJA nonlinearly; for continuous power handling >6.5 W, external heatsinking or increased copper area is required. The 1.5SMC20AHM3/I's RθJL is 15 °C/W, confirming efficient conduction through leads into PCB copper.
1.5SMC20AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 54.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC20AHM3/I FAQ
1.How can I place an order for 1.5SMC20AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC20AHM3/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 1.5SMC20AHM3/I reliable?
The price and inventory of 1.5SMC20AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC20AHM3/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC20AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC20AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC20AHM3/I?
1.5SMC20AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC20AHM3/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 1.5SMC20AHM3/I?
For technical support, including 1.5SMC20AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC20AHM3/I requirements.
6.How does Aetrix verify that 1.5SMC20AHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC20AHM3/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 1.5SMC20AHM3/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC20AHM3/I?
All 1.5SMC20AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC20AHM3/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 1.5SMC20AHM3/I part is unused and in its original packaging.
Return procedure for 1.5SMC20AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC20AHM3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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