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Vishay General Semiconductor - Diodes Division 1.5SMC20CAHM3_A/I
- Part No.:
- 1.5SMC20CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC20CAHM3_A/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,587
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Product details
Overview
1.5SMC20CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 20 V standoff voltage (VWM), 22.8 V minimum breakdown voltage (VBR), 1500 W peak pulse power (10/1000 μs), and clamps transients to ≤33.2 V at 45.2 A, making it suitable for protecting automotive sensor signal lines against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5SMC20CAHM3_A/I datasheet, 1.5SMC20CAHM3_A/I pinout, 1.5SMC20CAHM3_A/I application, or 1.5SMC20CAHM3_A/I equivalent, this device serves as a halogen-free, AEC-Q101 qualified TVS for robust ESD and surge immunity in automotive-grade PCB designs where bidirectional clamping, low leakage (<1 μA at 17.1 V), and MSL Level 1 reflow compatibility are required.
Technical Context
The 1.5SMC20CAHM3_A/I operates as a symmetrical avalanche diode with identical forward and reverse clamping characteristics, enabling bidirectional transient suppression without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance under repetitive 10/1000 μs pulses at 0.01% duty cycle.
Thermally, it exhibits RθJL = 15 °C/W (junction-to-leads) and RθJA = 75 °C/W (junction-to-ambient on recommended 8.0 mm × 8.0 mm copper pads), supporting reliable operation up to TJ = +150 °C. The device meets JESD201 Class 2 whisker resistance and is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.8 V min / 25.2 V max at 1 mA - Ensures consistent avalanche initiation across production lots for predictable clamping onset. |
| VC (Clamping Voltage) | 33.2 V at IPPM = 45.2 A - Limits transient voltage seen by protected ICs during worst-case 10/1000 μs surge events. |
| PPPM (Peak Pulse Power) | 1500 W - Sustains high-energy transients such as ISO 7637-2 Pulse 5a without degradation when mounted per recommended pad layout. |
| ID (Reverse Leakage) | <1 μA at 17.1 V - Minimizes standby power loss and avoids false triggering in low-power sensor interfaces. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments with extended thermal margins. |
| AEC-Q101 Qualified | Yes - Validated for automotive reliability including temperature cycling, HTRB, and ESD per AEC standard; suffix HM3 denotes halogen-free RoHS compliance. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD22-B102; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (reverse bias) | One terminal of symmetrical junction; conducts during positive or negative transients relative to cathode. |
| Cathode | Transient current exit point (reverse bias) | Second terminal of symmetrical junction; forms bidirectional clamping path with anode; no band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, LIN, sensor bridges) without polarity concerns. |
| 1500 W peak pulse power | Withstands automotive load-dump and ISO 16750-2 surges up to 10/1000 μs waveform without failure when PCB layout follows Vishay's 8.0 mm × 8.0 mm pad recommendation. |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control units, ADAS sensors, and body electronics requiring long-term field reliability. |
| Halogen-free & RoHS-compliant | Suffix HM3 confirms compliance with environmental regulations and eliminates brominated flame retardants in molding compound. |
| MSL Level 1 | Allows unlimited floor life and reflow up to 260 °C peak, simplifying SMT assembly without dry-pack or baking requirements. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine bay modules exposed to ISO 7637-2 Pulse 5a (load dump) and ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at connector interface to shunt surge energy before reaching precision ADC or signal conditioner ICs. Use Value: Limits transient voltage to ≤33.2 V, preventing latch-up or damage to downstream 3.3 V or 5 V rail-sensitive components while maintaining <1 μA leakage at 17.1 V. |
Use Scenario: Safeguarding RS-485/RS-422 differential data lines in factory automation PLCs subjected to lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Common-mode surge suppressor across A/B bus lines, leveraging symmetrical clamping to preserve signal integrity during fast-rising transients. Use Value: Responds in <1 ps to clamp ±33.2 V within 10/1000 μs, preserving data eye opening and avoiding communication errors in noisy industrial environments. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage protection on DC outputs of wall adapters used in smart home hubs, guarding against internal regulator failures or feedback loop faults. IC Role / Device Role / Timing Role: Fast-acting crowbar element that activates before downstream LDOs or microcontrollers experience overvoltage stress. Use Value: Clamps 20 V nominal rails to 33.2 V during fault conditions, providing 13.2 V headroom for safe shutdown or fuse activation without compromising system availability. |
Use Scenario: Primary protection for Ethernet PHY power pins (e.g., 3.3 V bias supply) on telecom line cards handling PoE-powered devices. IC Role / Device Role / Timing Role: Standoff-and-clamp TVS placed between VDD and GND to absorb induced surges from nearby AC mains coupling or lightning strikes on connected cables. Use Value: Delivers 1500 W pulse handling with <1 μA leakage at 17.1 V, ensuring minimal impact on quiescent current while meeting GR-1089-CORE Level 4 surge immunity requirements. |
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 | Lower PPPM (600 W), same VWM/VBR range, SMB (DO-214AA) package - smaller footprint but reduced thermal mass and surge capacity. | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a or lightning-level surges. | Select when board space is constrained and surge threat level is limited to human-body-model ESD or low-duty-cycle switching noise. |
| 1.5KE20CA | Through-hole TO-218 package, same electrical specs, higher thermal inertia - requires manual or wave soldering, not compatible with automated SMT lines. | Used in legacy industrial power supplies where rework tolerance and mechanical robustness outweigh SMT assembly efficiency. | Choose only when existing through-hole infrastructure exists and AEC-Q101 qualification is not required; otherwise prefer 1.5SMC20CAHM3_A/I for automotive SMT production. |
Compared with SMBJ20CA and 1.5KE20CA, the 1.5SMC20CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, 1500 W surge capability, and SMC surface-mount compatibility - making it the optimal choice for new automotive and high-reliability industrial designs requiring automated assembly and certified reliability.
Availability
1.5SMC20CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O protection, and telecom line card surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC20CAHM3_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 diodes, rectifiers, MOSFETs, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series was developed specifically for high-power, surface-mount transient suppression in automotive, industrial, and communications systems demanding AEC-Q101 validation and robust 10/1000 μs surge handling.
FAQ
What does the "HM3" suffix indicate in 1.5SMC20CAHM3_A/I?
The "HM3" suffix in 1.5SMC20CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JEDEC JESD201 Class 2 whisker resistance, MSL Level 1 reflow capability (peak 260 °C), and absence of brominated flame retardants - critical for automotive and green-electronics manufacturing. This distinguishes it from commercial-grade "M3" or "E3" variants.
Is 1.5SMC20CAHM3_A/I suitable for protecting CAN bus lines?
Yes, 1.5SMC20CAHM3_A/I is well-suited for CAN bus protection due to its bidirectional clamping, low leakage (<1 μA at 17.1 V), and fast response time. Its 20 V standoff aligns with typical 12 V automotive CAN networks, and clamping at ≤33.2 V prevents damage to transceivers like TJA1042 or SN65HVD230 during ISO 16750-2 or ISO 7637-2 transients - provided layout follows Vishay's recommended 8.0 mm × 8.0 mm copper pads per terminal.
How does the 10/1000 μs waveform rating apply to real-world surge events?
The 1500 W rating for 1.5SMC20CAHM3_A/I is specified under the standardized 10/1000 μs double-exponential surge waveform (10 μs rise, 1000 μs decay), which models lightning-induced surges and automotive load-dump events. In practice, this means the device can safely clamp a 45.2 A peak current transient lasting ~1 ms without degradation - assuming proper PCB thermal design (e.g., 8.0 mm × 8.0 mm copper pads) and adherence to derating curves above 25 °C ambient.
What is the significance of "CA" in the part number 1.5SMC20CAHM3_A/I?
The "CA" in 1.5SMC20CAHM3_A/I explicitly identifies the device as a bidirectional Transient Voltage Suppressor. Unlike unidirectional "A" variants, the "CA" version provides symmetrical clamping in both polarities - essential for protecting AC-coupled, floating, or differential signal paths (e.g., RS-485, CAN, sensor bridges) where voltage reversals occur naturally and polarity marking is impractical.
Does 1.5SMC20CAHM3_A/I require a heatsink for standard operation?
No, 1.5SMC20CAHM3_A/I does not require an external heatsink for transient suppression duty cycles (e.g., 0.01% for 10/1000 μs pulses). Its RθJL = 15 °C/W and recommended 8.0 mm × 8.0 mm copper pads provide sufficient thermal dissipation for short-duration surges. However, for continuous power dissipation >6.5 W (its PD rating), additional copper area or thermal vias are necessary - but this condition does not occur during normal TVS operation, which is inherently pulsed.
1.5SMC20CAHM3_A/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:
- Active
- 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_A/I FAQ
1.How can I place an order for 1.5SMC20CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC20CAHM3_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 1.5SMC20CAHM3_A/I reliable?
The price and inventory of 1.5SMC20CAHM3_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 1.5SMC20CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC20CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC20CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC20CAHM3_A/I?
1.5SMC20CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC20CAHM3_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 1.5SMC20CAHM3_A/I?
For technical support, including 1.5SMC20CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC20CAHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC20CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC20CAHM3_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 1.5SMC20CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC20CAHM3_A/I?
All 1.5SMC20CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC20CAHM3_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 1.5SMC20CAHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC20CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC20CAHM3_A/I Tags
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