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Vishay General Semiconductor - Diodes Division SM15T22CAHE3/9AT
- Part No.:
- SM15T22CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T22CAHE3/9AT.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,265
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Product details
Overview
SM15T22CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 22 V standoff voltage (VWM), and clamping voltage of 30.6 V at 49.0 A peak pulse current. It provides robust protection for automotive-grade sensor signal lines against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T22CAHE3/9AT datasheet, SM15T22CAHE3/9AT pinout, SM15T22CAHE3/9AT application, or SM15T22CAHE3/9AT equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, 1500 W surge capability, low clamping ratio (1.39), and compatibility with high-reliability automotive PCB layouts requiring MSL Level 1 and JESD201 Class 2 whisker resistance.
Technical Context
This device operates as a voltage-clamped crowbar during transient overvoltage events, with symmetrical breakdown in both directions due to its bidirectional construction. Its glass-passivated junction ensures stable VBR (20.9–23.1 V) and low leakage (<1.0 μA at 18.8 V) across -65 °C to +150 °C operating range.
The SM15T22CAHE3/9AT delivers 30.6 V clamping at 49.0 A (10/1000 μs), achieving a clamping ratio of 1.39 relative to VWM, and exhibits thermal resistance of 75 °C/W (junction-to-ambient) when mounted on 8.0 mm × 8.0 mm copper pads - critical for sustained surge handling in automotive ECUs and ADAS sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 24 V automotive systems. |
| VBR min/max | 20.9 V / 23.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on under fast transients. |
| VC @ IPPM | 30.6 V - Clamped voltage at 49.0 A peak pulse; limits downstream IC stress to safe levels during ISO 7637-2 Pulse 1/2/5a events. |
| PPPM | 1500 W - Peak pulse power rating with 10/1000 μs waveform; meets SAE J1113-11 and ISO 16750-2 surge immunity requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood environments without derating below 125 °C ambient. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs heatsinking needs for repetitive surge duty cycles. |
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); matte tin-plated leads compliant with J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Conducts surge current in either direction; connects to protected line (e.g., CAN_H or LIN bus). |
| Cathode | Transient current exit point (bidirectional) | Completes low-impedance path to ground or reference rail during clamping; requires low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (500 V/1 Ω, 50 ms) without degradation when properly mounted on recommended copper area. |
| Low clamping ratio (1.39) | Minimizes voltage overshoot across protected ICs - critical for 3.3 V or 5 V logic interfacing with 24 V supply domains. |
| MSL Level 1, 260 °C reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free RoHS-compliant | Meets automotive ELV Directive and IPC-1752A material declaration standards for sustainable manufacturing. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor signal line and chassis ground. Use Value: Limits transient excursions to ≤30.6 V, preserving ADC input integrity and preventing latch-up in microcontroller analog front-ends. |
Use Scenario: Safeguarding CAN_H/CAN_L differential pair against ESD (IEC 61000-4-2) and coupled surges in vehicle networking gateways. IC Role / Device Role / Timing Role: Low-capacitance TVS pair (one per line) referenced to common ground, enabling <1 ns response. Use Value: Maintains signal integrity up to 1 Mbps by clamping without adding >100 pF parasitic capacitance per line. |
| Industrial Motor Drive I/O | Telecom Power Interface |
|
Use Scenario: Shielding digital I/O and encoder feedback lines in variable-frequency drives subjected to inductive kickback from contactors and solenoids. IC Role / Device Role / Timing Role: Fast-response transient suppressor bridging isolated signal lines to functional ground. Use Value: Absorbs 49 A pulses without failure, ensuring uninterrupted encoder quadrature signals during motor startup/stall events. |
Use Scenario: Guarding 48 V DC power inputs of telecom base station remote radio units against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge arrestor in series with upstream fuse and parallel with bulk capacitor. Use Value: Delivers 1500 W dissipation while maintaining VC below 31 V - well under 48 V system overvoltage trip threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA-E3/57T | Same VWM (22 V) and bidirectional structure, but lower PPPM (400 W) and higher VC (35.5 V at 11.3 A). | Rated for consumer/industrial use only; not AEC-Q101 qualified; unsuitable for automotive under-hood deployment. | Select when cost sensitivity outweighs surge margin and automotive qualification is unnecessary. |
| 1.5KE22CA | Through-hole DO-201 package; identical VWM/VC specs but larger footprint and lower thermal performance (RθJA ≈ 100 °C/W). | Limited to legacy board designs with through-hole assembly; incompatible with automated SMT lines and space-constrained modules. | Choose only for repair/replacement in existing through-hole systems where re-layout is prohibited. |
Compared with SMAJ22CA-E3/57T and 1.5KE22CA, the SM15T22CAHE3/9AT offers superior surge robustness (1500 W vs. 400 W/1500 W), automotive qualification, and SMT scalability - making it the preferred choice for new automotive and industrial designs demanding high reliability and compact layout.
Availability
SM15T22CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN/LIN bus protection, and industrial motor drive I/O requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM15T22CAHE3/9AT 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SM15T Series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing low clamping voltage, repeatable surge endurance, and seamless SMT integration into safety-critical ECUs.
FAQ
What does the "CA" suffix indicate in SM15T22CAHE3/9AT?
The "CA" suffix denotes a bidirectional configuration - meaning the SM15T22CAHE3/9AT clamps transient voltages symmetrically in both polarities, unlike unidirectional "A" variants. This makes SM15T22CAHE3/9AT ideal for protecting AC-coupled or differential signal lines such as CAN bus, where polarity reversal can occur during fault conditions.
Is SM15T22CAHE3/9AT suitable for 24 V automotive systems?
Yes - SM15T22CAHE3/9AT has a 22 V standoff voltage (VWM) and 30.6 V clamping voltage, providing adequate margin above nominal 24 V (±10%) and load-dump peaks up to 35 V. Its AEC-Q101 qualification and 150 °C maximum junction temperature confirm suitability for under-hood deployment in modern 24 V commercial vehicles.
How does the HE3 suffix affect SM15T22CAHE3/9AT's compliance status?
The "HE3" suffix indicates that SM15T22CAHE3/9AT is RoHS-compliant and AEC-Q101 qualified - distinguishing it from commercial-grade "E3" variants. This suffix confirms full automotive qualification including temperature cycling, humidity testing, and mechanical shock validation per AEC-Q101 Rev D, required for safety-related subsystems.
What is the mounting pad layout recommendation for optimal SM15T22CAHE3/9AT performance?
Vishay specifies 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for SM15T22CAHE3/9AT to achieve rated 1500 W pulse power and 75 °C/W thermal resistance. Smaller pads reduce surge capability and increase junction temperature - potentially triggering premature failure during repetitive transients.
Does SM15T22CAHE3/9AT have a defined polarity marking?
No - SM15T22CAHE3/9AT is a bidirectional device and carries no cathode band or polarity marking. Its symmetrical internal structure allows installation in either orientation on PCB, simplifying layout and eliminating risk of reverse placement errors during automated assembly.
SM15T22CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 49A
- 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)
SM15T22CAHE3/9AT FAQ
1.How can I place an order for SM15T22CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T22CAHE3/9AT 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 SM15T22CAHE3/9AT reliable?
The price and inventory of SM15T22CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T22CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T22CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T22CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T22CAHE3/9AT?
SM15T22CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T22CAHE3/9AT 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 SM15T22CAHE3/9AT?
For technical support, including SM15T22CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T22CAHE3/9AT requirements.
6.How does Aetrix verify that SM15T22CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T22CAHE3/9AT 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 SM15T22CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T22CAHE3/9AT?
All SM15T22CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T22CAHE3/9AT, 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 SM15T22CAHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T22CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T22CAHE3/9AT Tags
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