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Vishay General Semiconductor - Diodes Division 1.5SMC20CAHM3/I
- Part No.:
- 1.5SMC20CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC20CAHM3/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,752
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Product details
Overview
1.5SMC20CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on signal and power lines. It features 20 V standoff voltage (VWM), 22.8 V minimum breakdown voltage (VBR), 1500 W peak pulse power (10/1000 μs), clamping voltage of 32.4 V at 46.2 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the 1.5SMC20CAHM3/I datasheet, 1.5SMC20CAHM3/I pinout, 1.5SMC20CAHM3/I application, or 1.5SMC20CAHM3/I equivalent, this page delivers verified electrical parameters, package dimensions, automotive-grade reliability data, and real-world protection scenarios for ESD, lightning, and inductive switching transients in sensor interfaces and power rails.
Technical Context
The 1.5SMC20CAHM3/I operates as a bidirectional avalanche diode with symmetrical clamping behavior in both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 17.1 V).
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and maximum junction temperature of +150 °C, supporting operation in under-hood automotive environments and industrial control cabinets where ambient temperatures exceed 85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 20 V - Maximum continuous reverse voltage before conduction begins; defines safe operating window for protected circuitry. |
| VBR (Min) | 22.8 V at 1 mA - Guaranteed avalanche initiation threshold; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 46.2 A - Clamped voltage during 1500 W transient; determines worst-case stress on downstream ICs or MOSFETs. |
| PPPM | 1500 W (10/1000 μs) - Peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) compliance when properly laid out. |
| IPPM | 46.2 A - Peak pulse current capability; sets minimum trace width and PCB copper area requirements for thermal dissipation. |
| TJ max | +150 °C - Maximum junction temperature; enables use in AEC-Q101 automotive applications including engine control modules and ADAS sensors. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL level 1 (260 °C reflow peak). Bidirectional construction has no polarity marking; terminals are symmetrical anode/cathode pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no marking required per bidirectional design. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path across protected line pair (e.g., CAN_H/CAN_L or RS-485 A/B). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and body electronics; supports 15-year lifecycle requirements. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV without degradation when mounted on 8 mm × 8 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during fast transients, protecting 3.3 V and 5 V logic interfaces without additional series impedance. |
| Halogen-free & RoHS-compliant | Meets JESD201 class 2 whisker resistance and global environmental regulations for industrial and automotive production. |
| Fast response time (<1 ps) | Clamps sub-nanosecond ESD events (IEC 61000-4-2 ±8 kV contact) before sensitive CMOS inputs experience latch-up or gate oxide damage. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting wheel speed, pressure, and temperature sensors exposed to load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor supply and ground pins to clamp induced spikes up to ±100 V. Use Value: Prevents sensor output corruption and microcontroller reset during cranking and ignition events while maintaining signal integrity below 32.4 V. |
Use Scenario: Safeguarding CAN_H and CAN_L differential pair against ESD and ISO 7637-2 pulse 1/2a/5a transients in body control modules. IC Role / Device Role / Timing Role: One 1.5SMC20CAHM3/I placed across CAN_H–CAN_L to suppress common-mode surges; second across CAN_H–GND and third across CAN_L–GND if needed. Use Value: Maintains CAN bit timing integrity by limiting differential voltage excursion to ≤32.4 V, preventing bus lockup or false dominant detection. |
| Industrial PLC I/O Protection | Telecom Line Interface Protection |
|
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional TVS connected between input terminal and system ground, rated for continuous 24 V operation with 20 V VWM. Use Value: Enables >100,000 surge cycles without parameter shift, reducing field failure rates in factory automation equipment. |
Use Scenario: Protecting Ethernet PHY or RS-485 transceivers on outdoor telecom nodes subjected to lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Placed across differential pair (e.g., TX+/TX−) to absorb common-mode energy while preserving signal rise/fall times. Use Value: Limits clamping voltage to 32.4 V, ensuring transceiver survival during 6 kV lightning surges per ITU-T K.21 Basic Level. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA | Same VWM (20 V) and VC (32.4 V), but lower PPPM = 600 W; SMB package (smaller footprint, higher RθJA = 90 °C/W). | Not suitable for IEC 61000-4-5 Level 4; limited to Level 2/3 or low-energy ESD-only zones. | Select when board space is constrained and surge energy is ≤600 W; verify thermal margin with smaller copper area. |
| 1.5KE20CA | Same electrical specs but axial-leaded DO-201AD package; higher mounting inductance and manual assembly requirement. | Not compatible with automated SMT lines; unsuitable for high-density automotive PCBs. | Choose only for prototyping, repair, or legacy through-hole designs; avoid for new AEC-Q101 production programs. |
Compared with SMBJ20CA and 1.5KE20CA, the 1.5SMC20CAHM3/I uniquely combines 1500 W surge rating, SMC surface-mount compatibility, halogen-free AEC-Q101 qualification, and symmetrical bidirectional clamping-making it the preferred choice for volume automotive and industrial SMT production requiring long-term reliability and regulatory compliance.
Availability
1.5SMC20CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN bus nodes, industrial PLC I/O modules, and telecom line drivers requiring stable component supply, full traceability, and AEC-Q101 assurance.
Supply support for 1.5SMC20CAHM3/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, efficiency, and automotive-grade validation.
The 1.5SMC Series was engineered specifically for high-power, surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC20CAHM3/I at its rated peak pulse current?
The 1.5SMC20CAHM3/I clamps to a maximum of 32.4 V at its peak pulse current of 46.2 A (10/1000 μs waveform). This value is measured under standardized test conditions with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC standards, and represents the upper limit of voltage seen by protected circuitry during a full-rated surge event.
Is the 1.5SMC20CAHM3/I suitable for automotive applications?
Yes, the 1.5SMC20CAHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials. Its SMC package, +150 °C maximum junction temperature, and validated surge performance make it appropriate for under-hood and chassis-mounted automotive systems including engine control units, ADAS sensors, and body electronics modules.
How does the bidirectional design of the 1.5SMC20CAHM3/I affect its placement on a PCB?
The 1.5SMC20CAHM3/I has no polarity marking and functions identically in either orientation, simplifying layout and eliminating risk of reverse installation. It can be placed directly across differential lines (e.g., CAN_H/CAN_L) or between any two nodes requiring symmetrical overvoltage protection without regard to signal direction or DC bias polarity.
What is the thermal resistance of the 1.5SMC20CAHM3/I, and how does it impact layout?
The 1.5SMC20CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pad per terminal. To maintain reliability under repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks-especially in automotive applications where ambient temperatures exceed 85 °C.
Does the 1.5SMC20CAHM3/I meet industry surge immunity standards?
The 1.5SMC20CAHM3/I supports compliance with IEC 61000-4-5 (Level 4, 4 kV) and ISO 7637-2 (Pulse 1, 2a, 5a) when implemented with proper PCB layout-including minimum 8 mm × 8 mm copper pads, short traces, and low-inductance grounding. Its 1500 W rating and 32.4 V clamping enable robust protection margins for these standards.
1.5SMC20CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
1.5SMC20CAHM3/I FAQ
1.How can I place an order for 1.5SMC20CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC20CAHM3/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 1.5SMC20CAHM3/I reliable?
The price and inventory of 1.5SMC20CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC20CAHM3/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC20CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC20CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC20CAHM3/I?
1.5SMC20CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC20CAHM3/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 1.5SMC20CAHM3/I?
For technical support, including 1.5SMC20CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC20CAHM3/I requirements.
6.How does Aetrix verify that 1.5SMC20CAHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC20CAHM3/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 1.5SMC20CAHM3/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC20CAHM3/I?
All 1.5SMC20CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC20CAHM3/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 1.5SMC20CAHM3/I part is unused and in its original packaging.
Return procedure for 1.5SMC20CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC20CAHM3/I Tags
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ESD9B5.0ST5G
onsemi
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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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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
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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