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Vishay General Semiconductor - Diodes Division SM15T22AHE3/9AT
- Part No.:
- SM15T22AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T22AHE3/9AT.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
SM15T22AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 30.6 V clamping voltage at 49.0 A peak pulse current, and 18.8 V stand-off voltage. It protects MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive and industrial systems.
For engineers reviewing the SM15T22AHE3/9AT datasheet, SM15T22AHE3/9AT pinout, SM15T22AHE3/9AT application, or SM15T22AHE3/9AT equivalent, key selection criteria include verified clamping performance at IPPM = 49.0 A, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, triggering when reverse voltage exceeds its 20.9–23.1 V breakdown range (VBR at 1 mA). Its low-inductance SMC package and glass-passivated junction enable fast response to sub-microsecond transients while sustaining 200 A non-repetitive forward surge current (IFSM).
Thermal design relies on RθJL = 15 °C/W junction-to-lead resistance and derating above TA = 25 °C per Fig. 2; maximum junction temperature is 150 °C. Failure mode under overstress is short-circuit, consistent with IEC 61000-4-5 Level 4 compliance requirements for system-level surge immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18.8 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin. |
| VBR (min/max) | 20.9 V / 23.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 30.6 V at 49.0 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 1500 W - Peak pulse power handling capability; validates suitability for lightning surge (IEC 61000-4-5) and motor-switching threats. |
| TJ max. | 150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with standard SMT reflow profiles (MSL level 1, 260 °C peak). |
Pinout & Package
SM15T22AHE3/9AT uses the SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, 0.305" × 0.246" (7.75 mm × 6.22 mm) body, cathode band marking on one end. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or low-side return path; defines reference for clamping action. |
| Cathode | Reverse voltage input / Surge current sink | Marked with band; connects to protected line (e.g., CAN_H, sensor supply); conducts surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| Glass passivated junction | Ensures stable VBR over temperature and long-term reliability in humid or high-vibration environments. |
| Low inductance layout | Minimizes voltage overshoot during fast-rising transients (<10 ns rise time), critical for protecting high-speed interfaces. |
| 1500 W peak pulse rating | Supports IEC 61000-4-5 4th-level surge testing (4 kV line-earth, 2 kV line-line) without degradation. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 18.8 V. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤30.6 V during 49 A transients, preventing latch-up or gate oxide damage. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Shunt protector on 4–20 mA or 0–10 V signal paths exposed to relay-coil switching noise. Use Value: Maintains signal integrity by suppressing >1 kV transients with <100 ns response, avoiding ADC saturation or op-amp rail-to-rail clipping. |
| Telecom Interface Port Protection | Consumer Device USB Power Input |
Use Scenario: Safeguarding Ethernet PHY power pins (e.g., MDI-X) against ESD and surge coupling from PoE injectors. IC Role / Device Role / Timing Role: Primary clamping device on +3.3 V or +5 V bias rails feeding magnetics and PHY ICs. Use Value: Withstands repeated 1500 W surges while maintaining <1 μA leakage at 18.8 V, ensuring no standby current penalty. | Use Scenario: Hardening USB-C VBUS input of portable speakers or smart displays against hot-plug and adapter surge events. IC Role / Device Role / Timing Role: Front-end TVS on input side of buck converter, placed before input capacitor. Use Value: Clamps 10/1000 μs surges to 30.6 V before they stress input MOSFETs or controller ICs, extending product field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/57T | 600 W PPPM rating, SMA package (smaller thermal mass), VBR = 24.4–26.9 V, VC = 35.5 V @ 17.1 A | Limited to lower-energy threats (IEC 61000-4-5 Level 2); unsuitable for automotive load-dump. | Select when board space is constrained and surge threat level is ≤600 W. |
| SMCJ22AHE3/9AT | Same SMC package, AEC-Q101 qualified, but 3000 W PPPM, VBR = 24.4–26.9 V, VC = 35.5 V @ 84.5 A | Over-spec'd for 1500 W use cases; higher clamping voltage reduces margin for 3.3 V logic protection. | Choose only when future-proofing against higher surge levels or extended lifetime requirements. |
Compared with SM15T22AHE3/9AT, SMAJ22A-E3/57T offers smaller footprint but sacrifices 60% pulse power headroom and automotive qualification; SMCJ22AHE3/9AT delivers double the surge capacity but raises clamping voltage by 4.9 V, reducing safety margin for low-voltage ICs.
Availability
SM15T22AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom port protection requiring stable component supply across production lifecycles.
Supply support for SM15T22AHE3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with global manufacturing and quality certification to AEC-Q101 and RoHS standards.
The SM15T Series targets high-reliability transient suppression in harsh environments; it was engineered specifically for automotive and industrial applications demanding 1500 W surge robustness and MSL level 1 solderability.
FAQ
What is the clamping voltage of SM15T22AHE3/9AT at its rated peak pulse current?
The SM15T22AHE3/9AT has a maximum clamping voltage (VC) of 30.6 V when subjected to its peak pulse current (IPPM) of 49.0 A using the standard 10/1000 μs waveform. This value is measured under specified test conditions: mounted on 8.0 mm × 8.0 mm copper pads, at TA = 25 °C. The SM15T22AHE3/9AT maintains this clamping performance across its operational temperature range, making it suitable for protecting 24 V nominal systems.
Is SM15T22AHE3/9AT qualified for automotive applications?
Yes, SM15T22AHE3/9AT is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number. This qualification confirms its reliability for automotive use cases including engine control modules, body electronics, and ADAS sensor interfaces. The SM15T22AHE3/9AT undergoes stress testing for temperature cycling, humidity, mechanical shock, and surge endurance per AEC-Q101 requirements.
How does the SM15T22AHE3/9AT differ from bidirectional TVS diodes like SM15T22CA?
The SM15T22AHE3/9AT is unidirectional and features a cathode band marking; it conducts only in reverse bias above VBR and blocks forward current up to 200 A IFSM. In contrast, SM15T22CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. The SM15T22AHE3/9AT is selected for DC-biased lines (e.g., 12 V power rails), whereas SM15T22CA suits AC or floating signal lines like RS-485.
What is the thermal resistance of SM15T22AHE3/9AT, and how does it affect PCB layout?
The SM15T22AHE3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W. To achieve rated power dissipation, the PCB must provide adequate copper area: Vishay specifies 0.31" × 0.31" (8.0 mm × 8.0 mm) pads per terminal. Reducing pad size increases thermal impedance and requires derating of PPPM above TA = 25 °C per Figure 2 in the SM15T22AHE3/9AT datasheet.
Does SM15T22AHE3/9AT meet RoHS and halogen-free requirements?
Yes, SM15T22AHE3/9AT is RoHS-compliant and AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation (Doc. #88380). It is not halogen-free; for halogen-free compliance, the equivalent part is SM15T22AHM3/9AT (suffix HM3). The SM15T22AHE3/9AT uses matte tin-plated leads and meets JESD 201 Class 2 whisker resistance.
SM15T22AHE3/9AT 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:
- 1
- Bidirectional Channels:
- -
- 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)
SM15T22AHE3/9AT FAQ
1.How can I place an order for SM15T22AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T22AHE3/9AT 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 SM15T22AHE3/9AT reliable?
The price and inventory of SM15T22AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T22AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T22AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T22AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T22AHE3/9AT?
SM15T22AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T22AHE3/9AT 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 SM15T22AHE3/9AT?
For technical support, including SM15T22AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T22AHE3/9AT requirements.
6.How does Aetrix verify that SM15T22AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T22AHE3/9AT 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 SM15T22AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T22AHE3/9AT?
All SM15T22AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T22AHE3/9AT, 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 SM15T22AHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T22AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T22AHE3/9AT Tags
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