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Vishay General Semiconductor - Diodes Division SM15T22CAHM3/H
- Part No.:
- SM15T22CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T22CAHM3/H.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,950
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Product details
Overview
SM15T22CAHM3/H 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), 30.6 V maximum clamping voltage at 49.0 A IPPM, and 18.8 V stand-off voltage. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T22CAHM3/H datasheet, SM15T22CAHM3/H pinout, SM15T22CAHM3/H application, or SM15T22CAHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, clamping behavior under standardized surge waveforms, and direct alternatives with documented voltage and power differences.
Technical Context
The SM15T22CAHM3/H operates as a bidirectional avalanche diode with symmetrical breakdown characteristics-VBR min/max = 20.9 V / 23.1 V at IT = 1.0 mA-and exhibits low dynamic impedance to achieve tight clamping (VC = 30.6 V @ IPPM = 49.0 A). Its glass-passivated junction ensures stable leakage performance (ID ≤ 1.0 μA at VWM = 18.8 V) across -65 °C to +150 °C operating range.
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads, it delivers RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable thermal dissipation without heatsinking in typical PCB layouts. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification per Vishay's automotive-grade variant line.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - sustains single high-energy surges common in automotive load-dump and industrial motor switching events |
| Stand-off Voltage (VWM) | 18.8 V - defines maximum continuous reverse voltage before significant leakage; sets operating margin below breakdown |
| Breakdown Voltage (VBR) | 20.9 V to 23.1 V at 1.0 mA - symmetric bidirectional conduction threshold; determines earliest clamping onset |
| Maximum Clamping Voltage (VC) | 30.6 V at 49.0 A IPPM - limits transient voltage seen by protected ICs; critical for 24 V system compatibility |
| Peak Pulse Current (IPPM) | 49.0 A (10/1000 μs) - quantifies surge current handling; used with source impedance to verify protection margin |
| Junction Temperature Range | -65 °C to +150 °C - supports under-hood automotive and industrial ambient conditions without derating |
| Thermal Resistance (Junction-to-Ambient) | 75 °C/W - enables power dissipation modeling on standard FR-4 with recommended pad layout |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Conducts during positive or negative overvoltage excursions; tied to protected line |
| Cathode | Transient current exit point (bidirectional) | Completes low-impedance path to ground or reference rail; no band marking on CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 1500 W surge rating | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during fast transients, reducing stress on downstream 3.3 V/5 V logic |
| Halogen-free, RoHS-compliant construction | Meets automotive OEM environmental requirements and supports lead-free reflow profiles up to 260 °C |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirement in production assembly |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers in vehicle door modules from ESD and load-dump transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between signal line and chassis ground to shunt surge energy before reaching transceiver input pins. Use Value: Maintains signal integrity during 1500 W surges while holding clamped voltage below 31 V-within absolute max rating of ISO 11898-2 compliant transceivers. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each isolated input channel, coordinated with upstream series impedance. Use Value: Limits transient voltage to ≤30.6 V at 49 A, preventing latch-up in optocoupler input stages and ensuring >5 V noise margin for Schmitt-trigger inputs. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Differential-line TVS pair (one per line) referenced to common ground, absorbing common-mode transients. Use Value: Symmetric 20.9–23.1 V breakdown ensures balanced clamping on A/B lines, preserving differential signaling integrity during 10/1000 μs threats. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home vacuum cleaners and power tools. IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback before it couples into MCU power rails or Hall-effect sensors. Use Value: 1500 W rating handles repetitive 49 A spikes; 150 °C TJ max allows operation near motor housings without thermal shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA | Lower peak power (400 W), same VWM (18.8 V), higher VC (35.5 V @ 11.3 A) | Restricted to lower-energy threats; insufficient for lightning-level transients in automotive/industrial settings | Select when cost sensitivity outweighs surge robustness and board space permits parallel devices |
| SMCJ22CA | Same package, higher peak power (1500 W), identical VWM/VBR/VC specs, but M3 (not HM3) suffix - no AEC-Q101 qualification | Lacks automotive qualification; suitable for commercial/industrial use where AEC compliance is not mandated | Choose for non-automotive designs requiring identical electrical performance without automotive certification overhead |
Compared with SMAJ22CA and SMCJ22CA, the SM15T22CAHM3/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free construction-making it the only option among the three qualified for under-hood automotive deployment with zero compromise on clamping performance.
Availability
SM15T22CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing aligned with OEM quality standards.
Supply support for SM15T22CAHM3/H 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, power efficiency, and automotive-grade qualification.
The SM15T Series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where failure modes must be predictable (short-circuit) and performance stable across temperature and lifetime.
FAQ
What is the clamping voltage of SM15T22CAHM3/H at its rated peak pulse current?
The SM15T22CAHM3/H has a maximum clamping voltage (VC) of 30.6 V when subjected to its rated peak pulse current (IPPM) of 49.0 A under the standard 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SM15T22CAHM3/H qualified for automotive applications?
Yes, SM15T22CAHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and accelerated life, validating its suitability for automotive powertrain, body electronics, and ADAS sensor modules per industry requirements.
What does the "CA" suffix indicate in SM15T22CAHM3/H?
The "CA" suffix in SM15T22CAHM3/H denotes a bidirectional configuration-meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SM15T22AHM3/H), it has no cathode band marking and conducts equally in either polarity above its breakdown threshold.
How does the thermal resistance of SM15T22CAHM3/H affect PCB layout?
The SM15T22CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads. To maintain safe junction temperatures under repeated surges, designers must allocate adequate copper area and avoid thermal isolation-especially in high-temperature environments like automotive under-hood locations.
What is the maximum reverse leakage current for SM15T22CAHM3/H at its stand-off voltage?
At its stand-off voltage (VWM) of 18.8 V and TA = 25 °C, the SM15T22CAHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage ensures minimal power loss and signal interference in always-on circuits such as automotive wake-up lines or industrial sensor bias networks.
SM15T22CAHM3/H 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 (SMC)
SM15T22CAHM3/H FAQ
1.How can I place an order for SM15T22CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T22CAHM3/H 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 SM15T22CAHM3/H reliable?
The price and inventory of SM15T22CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T22CAHM3/H is usually 5 days.
3.What payment methods are accepted for SM15T22CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T22CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T22CAHM3/H?
SM15T22CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T22CAHM3/H 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 SM15T22CAHM3/H?
For technical support, including SM15T22CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T22CAHM3/H requirements.
6.How does Aetrix verify that SM15T22CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SM15T22CAHM3/H 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 SM15T22CAHM3/H meets industry standards.
7.What is the process for return or replacement of SM15T22CAHM3/H?
All SM15T22CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SM15T22CAHM3/H, 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 SM15T22CAHM3/H part is unused and in its original packaging.
Return procedure for SM15T22CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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