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STMicroelectronics SM30T23AY
- Part No.:
- SM30T23AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM30T23AY.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,801
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Product details
Overview
SM30T23AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed to clamp transient overvoltages up to 32.4 V (max clamping voltage at 83.9 A, 10/1000 µs), with 3000 W peak pulse power rating and 0.2 µA max leakage at 25 °C. It protects CAN, LIN, and sensor supply lines in 12 V automotive systems against ISO 7637-2 pulses (Pulse 1: −150 V; Pulse 2a: +112 V; Pulse 3a: −220 V; Pulse 3b: +150 V) and exceeds ISO 10605 ESD immunity (±30 kV air/contact discharge).
For engineers reviewing the SM30T23AY datasheet, SM30T23AY pinout, SM30T23AY application, or SM30T23AY equivalent, key selection criteria include clamping voltage at rated surge current, junction temperature capability (−55 °C to +175 °C), low dynamic resistance (24.4 mΩ), compliance with automotive surge standards, and SMC package thermal performance on FR4 PCBs.
Technical Context
This unidirectional TVS diode uses planar silicon technology to achieve stable breakdown behavior and low leakage across its operating junction temperature range (−55 °C to +175 °C). Its VBR is specified at 22.2–24.6 V (min–max, 25 °C), with temperature coefficient αT = 10 × 10⁻⁴ /°C enabling accurate VCL prediction across temperature.
The device delivers 3000 W peak pulse power under 10/1000 µs waveform at Tj = 25 °C, derating to ~1800 W at Tj = 125 °C per Figure 3. Its low dynamic resistance (24.4 mΩ) ensures minimal voltage overshoot during fast transients like ISO 10605 ESD events and 8/20 µs surges up to 42.8 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 22.2 V / 23.4 V / 24.6 V - precise reverse breakdown threshold for reliable clamping onset in 12 V battery systems |
| VCL @ IPP = 83.9 A (10/1000 µs) | 32.4 V - maximum clamped voltage seen by protected IC during worst-case load dump or ISO 7637-2 Pulse 1 |
| IPP (10/1000 µs) | 83.9 A - surge current handling capacity defining protection margin against 3000 W transient energy |
| RD (Dynamic Resistance) | 24.4 mΩ - low impedance path limiting voltage rise ΔV = RD × IPP during fast transients |
| IRM @ VRM = 20 V | 0.2 µA - ultra-low leakage preserving battery life in always-on automotive modules |
| Tj Operating Range | −55 °C to +175 °C - full specification over extended automotive ambient and under-hood conditions |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact/air - exceeds Level 4 for robustness in assembly and field environments |
Pinout & Package
SM30T23AY is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads and MSL level 1 moisture sensitivity. The package measures 7.75–8.15 mm (E) × 5.55–6.25 mm (D) × 2.45 mm (A2 max), optimized for thermal dissipation on standard FR4 PCBs with recommended 3.14 cm² copper area per lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Transient Current Sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode | Reference / Ground Return | Connected to system ground or low-impedance return path; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, mechanical shock, and humidity testing |
| ISO 7637-2 compliance | Clamps Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) without failure |
| Low dynamic resistance | 24.4 mΩ enables tight clamping window (VCL − VBR = 9.0 V) under 83.9 A surge |
| High junction temperature rating | 175 °C continuous operation supports placement near power converters and ECUs with elevated ambient temps |
| UL94 V0 flammability | Self-extinguishing epoxy housing meets automotive cabin and engine bay safety requirements |
Applications
| Body Control Module (BCM) Power Input | CAN FD Transceiver Protection |
|---|---|
|
Use Scenario: 12 V supply rail feeding BCM microcontroller, power management ICs, and relay drivers exposed to alternator load dump and jump-start surges. IC Role / Device Role: Primary overvoltage clamp placed between battery input and DC-DC converter input. Use Value: Limits transient voltage to ≤32.4 V during 83.9 A surges, preventing latch-up or gate oxide damage in downstream 36 V-rated regulators. |
Use Scenario: CAN FD physical layer (PHY) bus lines subjected to ESD events during connector mating and electromagnetic coupling from adjacent high-current circuits. IC Role / Device Role: Unidirectional TVS on CAN_H and CAN_L lines referenced to chassis ground. Use Value: Clamps ±30 kV ESD strikes with <1 ns response, maintaining signal integrity below 1 Vpp differential noise floor during 5 Mbps operation. |
| Automotive Camera Power Supply | Engine Coolant Temperature Sensor Interface |
|
Use Scenario: 5 V or 3.3 V camera module power rail powered via buck converter from 12 V battery, vulnerable to ISO 7637-2 Pulse 3b (+150 V) induced by ignition switching. IC Role / Device Role: Secondary TVS after primary filter, placed directly at camera module input connector. Use Value: Absorbs 3000 W surge energy while holding clamped voltage below 33 V, protecting 30 V-rated image sensor and ISP ICs. |
Use Scenario: Two-wire analog NTC thermistor circuit connected to ECU ADC input, routed through engine bay harness subject to ISO 10605 ESD and coupled transients. IC Role / Device Role: Low-leakage TVS on sensor signal line, grounded at ECU side to avoid bias current injection. Use Value: Adds only 0.2 µA leakage at 25 °C, preserving <0.1% measurement accuracy in 10 kΩ–100 kΩ thermistor range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A (onsemi) | VBR = 26.7–29.5 V; VCL = 38.9 V @ 77 A; 400 W rating; SMA package | Lower power rating and higher clamping voltage limit suitability to non-critical 12 V loads only | Select when cost sensitivity outweighs need for AEC-Q101 qualification and 3000 W surge margin |
| TPSMD24 (Texas Instruments) | VBR = 25.6–28.3 V; VCL = 38.5 V @ 77.9 A; 3000 W rating; SMC package; no AEC-Q101 data published | Lacks documented automotive qualification; may require additional reliability validation for production programs | Consider only for non-safety-critical industrial designs where AEC-Q101 is not mandated |
Compared with SMAJ24A and TPSMD24, SM30T23AY provides lower clamping voltage (32.4 V vs ≥38.5 V), verified AEC-Q101 qualification, and guaranteed 175 °C operation-making it the preferred choice for functional-safety-relevant automotive power rails and communication interfaces.
Availability
SM30T23AY is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power supplies, and ADAS sensor interfaces requiring stable component supply across multi-year vehicle production cycles.
Supply support for SM30T23AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete technologies with vertical manufacturing capabilities.
SM30T23AY belongs to the SM30TY series of planar TVS diodes engineered specifically for automotive-grade transient suppression-prioritizing low leakage, high-temperature stability, and compliance with ISO 7637-2, ISO 10605, and AEC-Q101.
FAQ
What is the maximum clamping voltage of SM30T23AY under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM30T23AY is 32.4 V when subjected to an 83.9 A peak pulse current with a 10/1000 µs waveform at 25 °C ambient. This value increases linearly with junction temperature due to the 10 × 10⁻⁴ /°C temperature coefficient, reaching approximately 34.1 V at 125 °C.
Is SM30T23AY suitable for bidirectional signal line protection?
No-SM30T23AY is a unidirectional TVS diode intended for DC power rail protection where polarity is fixed. For bidirectional signal lines such as USB, RS-485, or differential CAN, the bidirectional variant SM30T23CAY must be used, which clamps symmetrically for both positive and negative transients.
How does SM30T23AY perform under ISO 7637-2 Pulse 1 (−150 V)?
Under ISO 7637-2 Pulse 1 (−150 V, 50 Ω source impedance), SM30T23AY clamps the line voltage to ≤32.4 V within nanoseconds, diverting peak current up to 83.9 A. Its 3000 W rating and low dynamic resistance ensure no degradation after repeated pulses, validated per Figure 13 in DS8599 Rev 13.
What PCB layout practices maximize thermal performance for SM30T23AY?
To maximize thermal performance, use the recommended IPC7531-compliant footprint with ≥3.14 cm² of 70 µm-thick copper per lead (Figure 24), connect both terminals to internal ground/power planes, and avoid thermal relief on pads. Thermal resistance drops from 120 °C/W (minimal copper) to <40 °C/W with optimal layout, critical for sustained surge duty cycles.
SM30T23AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM30TY, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 92.6A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SM30T23AY FAQ
1.How can I place an order for SM30T23AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM30T23AY 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 SM30T23AY reliable?
The price and inventory of SM30T23AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM30T23AY is usually 5 days.
3.What payment methods are accepted for SM30T23AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM30T23AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM30T23AY?
SM30T23AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM30T23AY 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 SM30T23AY?
For technical support, including SM30T23AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM30T23AY requirements.
6.How does Aetrix verify that SM30T23AY is sourced from the original manufacturer or authorized distributors?
All SM30T23AY 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 SM30T23AY meets industry standards.
7.What is the process for return or replacement of SM30T23AY?
All SM30T23AY units undergo pre-shipment inspection (PSI). If there is an issue with SM30T23AY, 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 SM30T23AY part is unused and in its original packaging.
Return procedure for SM30T23AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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