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Vishay General Semiconductor - Diodes Division 1.5SMC20CAHE3/9AT
- Part No.:
- 1.5SMC20CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC20CAHE3/9AT.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,758
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Product details
Overview
1.5SMC20CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 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 operates across -65 °C to +150 °C junction temperature. It is AEC-Q101 qualified and used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5SMC20CAHE3/9AT datasheet, 1.5SMC20CAHE3/9AT pinout, 1.5SMC20CAHE3/9AT application, or 1.5SMC20CAHE3/9AT equivalent, this page delivers verified electrical parameters, package dimensions, clamping behavior under surge, thermal resistance data, and real-world selection guidance for ESD and lightning transient suppression in bidirectional AC-coupled or floating circuits.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response (<1 ps) and low incremental surge resistance, enabling effective clamping of transients induced by inductive switching or lightning surges. Its symmetrical I-V characteristic ensures identical protection in both polarities without polarity sensitivity.
Mounted on standard 8.0 mm × 8.0 mm copper pads, it delivers 1500 W peak pulse power per the 10/1000 µs waveform while maintaining a thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-leads). It meets MSL Level 1 and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 20 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating window for protected circuit. |
| VBR (Min) | 22.8 V at 1 mA - Guaranteed breakdown onset; ensures predictable clamping initiation during overvoltage events. |
| VC @ IPPM | 32.4 V at 46.2 A - Clamped voltage during 1500 W transient; determines maximum stress imposed on downstream components. |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy handling capacity; validates suitability for IEC 61000-4-5 Level 4 compliance testing. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs PCB pad layout requirements for sustained power dissipation. |
| TJ Range | -65 °C to +150 °C - Operating junction temperature range; supports deployment in under-hood automotive and industrial environments. |
| AEC-Q101 | Qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD; enables use in safety-critical ECUs. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); cathode band absent per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | Symmetrical connection point; functions as either anode or cathode depending on transient polarity - no DC bias dependency. |
| Cathode | Terminal B | Identical to Terminal A in bidirectional operation; enables protection on AC lines, differential buses, or floating grounds without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable leakage current (<5 µA at VWM) and long-term reliability under humidity and thermal stress. |
| 1500 W peak pulse rating | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-earth) with minimal derating on standard PCB layouts. |
| Low clamping ratio (VC/VBR = 1.42) | Minimizes let-through voltage during transients - critical for safeguarding 3.3 V or 5 V logic interfaces behind the TVS. |
| MSL Level 1, 260 °C reflow compatible | Enables standard lead-free SMT assembly without pre-baking or special handling. |
| AEC-Q101 qualification | Validates performance across automotive temperature, lifetime, and mechanical stress requirements - required for Tier 1 supply chains. |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or damage to 5 V-tolerant SAR ADCs while maintaining signal integrity below 20 V. |
Use Scenario: Safeguarding CANH/CANL lines in vehicle body control modules exposed to ESD and coupled transients. IC Role / Device Role / Timing Role: Symmetrical TVS pair (one per line) referenced to ground, absorbing common-mode surges without disrupting differential signaling. Use Value: Clamps ±32.4 V surges within nanoseconds, preserving CAN bit timing and preventing bus lockup during 10/1000 µs transients. |
| AC Power Input Stage | RS-485 Transceiver Port |
Use Scenario: Secondary overvoltage protection on AC-DC adapter inputs after MOV primary stage, targeting fast-rising spikes. IC Role / Device Role / Timing Role: Fast-response backup suppressor across live-neutral or live-ground, triggered after MOV clamping delay. Use Value: Responds <1 ps vs. MOV's ~25 ns, capturing early spike energy missed by slower devices and reducing stress on bridge rectifier. |
Use Scenario: Protecting half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation networks from cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS on each differential line (A/B) referenced to ground, placed immediately at connector entry. Use Value: Maintains signal eye diagram integrity by limiting differential overshoot to <65 V peak, meeting TIA-485-A fault tolerance 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 | Same VWM (20 V) and bidirectional structure, but lower PPPM (600 W) and larger VC (34.4 V at 17.4 A). | 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 (SMB vs. SMC) and surge energy is ≤600 W. |
| 1.5KE20CA | Through-hole TO-204AA (DO-41); same VWM/VBR, but higher VC (36.5 V) and slower thermal response due to package. | Requires wave soldering; incompatible with automated SMT lines and high-density layouts. | Choose only for legacy through-hole designs or prototyping where rework flexibility outweighs production efficiency. |
Compared with SMBJ20CA and 1.5KE20CA, the 1.5SMC20CAHE3/9AT delivers 2.5× higher surge power in an SMT-optimized package with tighter clamping and AEC-Q101 validation - making it the preferred choice for production automotive and industrial systems requiring validated reliability and high-energy transient immunity.
Availability
1.5SMC20CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus hardening, AC input staging, and RS-485 port safeguarding requiring stable component supply, AEC-Q101 traceability, and 13" tape-and-reel logistics support.
Supply support for 1.5SMC20CAHE3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power handling, and automotive-grade qualification.
The 1.5SMC Series was engineered specifically for high-power, surface-mount transient suppression in harsh environments - balancing surge robustness, thermal performance, and manufacturability for automotive, industrial, and telecom infrastructure applications.
FAQ
What is the clamping voltage of the 1.5SMC20CAHE3/9AT under a 1500 W transient?
The 1.5SMC20CAHE3/9AT clamps to a maximum of 32.4 V when subjected to its rated 1500 W peak pulse power (10/1000 µs waveform) at 46.2 A. This value is measured per Figure 1 and Table on page 2 of Vishay document 88303 and reflects worst-case device variation across temperature and lot. The 1.5SMC20CAHE3/9AT maintains this clamping performance consistently due to its glass-passivated junction and tight VBR tolerance (±5%).
Is the 1.5SMC20CAHE3/9AT suitable for automotive applications?
Yes, the 1.5SMC20CAHE3/9AT is AEC-Q101 qualified (as indicated by the "HE3" suffix), meaning it has passed stress tests for temperature cycling, high-temperature reverse bias, and ESD required for automotive under-hood and chassis-mounted electronics. Its -65 °C to +150 °C operating range and MSL Level 1 reflow compatibility further validate its readiness for automotive production. The 1.5SMC20CAHE3/9AT is commonly deployed in engine control sensor interfaces and body electronics modules.
How does the bidirectional configuration of the 1.5SMC20CAHE3/9AT affect PCB layout?
The 1.5SMC20CAHE3/9AT has no polarity marking and identical electrical behavior in both directions, eliminating orientation constraints during placement. This simplifies layout for AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating grounds - no need to verify anode/cathode alignment. Its SMC (DO-214AB) footprint requires 8.0 mm × 8.0 mm copper pads per terminal for full 1500 W rating, as specified in the "Mechanical Data" section of the Vishay datasheet.
What is the maximum leakage current of the 1.5SMC20CAHE3/9AT at its standoff voltage?
At VWM = 20 V and TA = 25 °C, the 1.5SMC20CAHE3/9AT exhibits a maximum reverse leakage current (ID) of 5 µA, per the "Electrical Characteristics" table on page 2 of Vishay document 88303. This low leakage ensures minimal power loss and signal distortion in high-impedance sensor or communication lines, supporting precision analog and low-power IoT designs where standby current matters.
Can the 1.5SMC20CAHE3/9AT replace a unidirectional TVS like 1.5SMC20AHE3/9AT?
No - the 1.5SMC20CAHE3/9AT is strictly bidirectional and lacks polarity marking, whereas the 1.5SMC20AHE3/9AT is unidirectional with a cathode band. Substituting them risks improper clamping on DC-biased lines: the 1.5SMC20CAHE3/9AT would conduct during normal forward bias, causing short-circuit failure. Use the 1.5SMC20CAHE3/9AT only where symmetrical protection is required (e.g., AC lines, differential pairs); retain unidirectional variants for DC rails.
1.5SMC20CAHE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC20CAHE3/9AT FAQ
1.How can I place an order for 1.5SMC20CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC20CAHE3/9AT 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 1.5SMC20CAHE3/9AT reliable?
The price and inventory of 1.5SMC20CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC20CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC20CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC20CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC20CAHE3/9AT?
1.5SMC20CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC20CAHE3/9AT 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 1.5SMC20CAHE3/9AT?
For technical support, including 1.5SMC20CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC20CAHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC20CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC20CAHE3/9AT 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 1.5SMC20CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC20CAHE3/9AT?
All 1.5SMC20CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC20CAHE3/9AT, 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 1.5SMC20CAHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC20CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC20CAHE3/9AT Tags
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