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STMicroelectronics SM50T30AY
- Part No.:
- SM50T30AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM50T30AY.pdf
- Description:
- AUTOMOTIVE 5000 W, 26 V TVS IN S
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
SM50T30AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMC package, designed to clamp transient surges up to 5000 W (10/1000 µs) and 85.7 A peak pulse current while maintaining 42.1 V clamping voltage at 10/1000 µs. It features 30.4 V minimum breakdown voltage, 0.2 µA leakage at 25 °C, and operates up to 175 °C junction temperature-enabling robust protection of 24 V automotive power rails against ISO 7637-2 Pulse 1, 2a, 3a, 3b, and ISO 10605 ESD events.
For engineers reviewing the SM50T30AY datasheet, SM50T30AY pinout, SM50T30AY application, or SM50T30AY equivalent, this device is selected for high-reliability 24 V system surge suppression where low leakage, high Tj capability, and IEC 61000-4-2/ISO 10605 compliance are mandatory-particularly in e-fuse, body control modules, and ADAS power supply inputs.
Technical Context
This unidirectional TVS uses planar silicon technology to achieve stable VBR temperature coefficient (αT = 10×10⁻⁴ /°C) and low dynamic resistance (RD = 30.2 mΩ), enabling precise clamping under fast transients like ISO 7637-2 Pulse 3b (VS = +150 V). Its SMC package supports JEDEC-compliant thermal dissipation with Rth(j-a) down to ~60 °C/W on 4 cm² copper area.
The device meets stringent automotive immunity standards: IEC 61000-4-2 contact discharge ≥30 kV, ISO 10605 air/contact discharge ≥30 kV, and ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V)-all verified at Tj = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak pulse power (10/1000 µs) | 5000 W - sustains 10 ms surges without failure in 24 V systems |
| Clamping voltage VCL (10/1000 µs) | 42.1 V - limits downstream IC stress below 45 V during load dump |
| Breakdown voltage VBR min | 28.9 V - ensures reliable conduction above nominal 24 V rail with margin |
| Leakage current IRM max | 0.2 µA at VRM = 26 V - prevents battery drain in always-on vehicle modules |
| Junction temperature range | −55 °C to +175 °C - qualified for under-hood placement near engine compartments |
| Dynamic resistance RD | 30.2 mΩ - minimizes voltage overshoot during 8/20 µs lightning-like transients |
| ESD rating (IEC 61000-4-2) | 30 kV contact/air - exceeds Level 4 for infotainment and sensor interface ports |
Pinout & Package
SM50T30AY is housed in a standard SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked with bar) and Anode. The package complies with JEDEC MO-136AC and IPC7531 footprint recommendations, featuring matte tin-plated leads and MSL Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (bar-marked end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode | Reference node | Tied to system ground or low-impedance return path; completes clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, and mechanical stress cycles |
| Planar junction technology | Enables stable 0.2 µA leakage at 25 °C and predictable αT = 10×10⁻⁴ /°C drift |
| Low dynamic resistance (30.2 mΩ) | Reduces clamping voltage overshoot during fast 8/20 µs transients by >15% vs. legacy TVS |
| UL94 V0 flammability rating | Ensures non-propagating flame behavior in enclosed automotive enclosures |
| JEDEC MSL Level 1 | Zero floor life limitation-no baking required before reflow soldering |
Applications
| Body Control Module (BCM) Power Input | e-Fuse / Smart High-Side Switch |
|---|---|
|
Use Scenario: Protects BCM 24 V input from load dump and alternator transients during ignition cycling. IC Role / Device Role / Timing Role: Unidirectional clamping device placed upstream of DC-DC converter input. Use Value: Limits VIN to ≤42.1 V during ISO 7637-2 Pulse 5b (87 V, 400 ms), preventing DC-DC latch-up or MOSFET overvoltage failure. |
Use Scenario: Shields e-fuse controller ICs from reverse battery and jump-start surges. IC Role / Device Role / Timing Role: Primary transient suppressor on high-side switch source terminal. Use Value: Withstands −150 V ISO 7637-2 Pulse 1 with <1 µs response, preserving gate driver integrity and fault detection accuracy. |
| ADAS Camera Power Rail | Automotive Infotainment Display Supply |
|
Use Scenario: Guards 24 V camera module input against ESD and cable discharge events. IC Role / Device Role / Timing Role: First-line ESD protection at connector entry point before LDO regulator. Use Value: Clamps 30 kV IEC 61000-4-2 contact discharge to <45 V within 1 ns, avoiding pixel corruption or image sensor latch-up. |
Use Scenario: Suppresses switching noise and hot-swap transients on display backlight power bus. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (paired with reverse polarity protection). Use Value: Maintains <0.2 µA leakage at 26 V, eliminating standby current penalty in always-on display sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower PPP (400 W), higher VCL (53.3 V @ 10/1000 µs), SMC package | Limited to 12 V systems; insufficient for 24 V load dump per ISO 7637-2 Pulse 5b | Select only for cost-sensitive 12 V sub-systems with lower surge exposure |
| TPSMD33A | Same PPP (5000 W), but VBR = 33 V min, VCL = 45.4 V @ 10/1000 µs, higher RD (36.6 mΩ) | Marginally compliant for 24 V systems; clamps 3.3 V higher than SM50T30AY under identical IPP | Acceptable if board layout allows 3.3 V higher clamping; verify DC-DC OVP threshold margin |
Compared with SMAJ33A and TPSMD33A, SM50T30AY delivers superior 24 V system protection via tighter VBR (28.9–31.9 V), lower VCL (42.1 V), and lower RD (30.2 mΩ), directly reducing stress on downstream regulators and enabling smaller heatsinking requirements.
Availability
SM50T30AY is available at Aetrix Electronics and suitable for automotive body electronics, ADAS power management, and infotainment subsystems requiring stable component supply with AEC-Q101 traceability and long-lifecycle support.
Supply support for SM50T30AY 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 management solutions with vertical manufacturing and broad IP portfolio.
SM50T30AY belongs to the SM50TY series-a family of high-power automotive TVS diodes engineered specifically for ISO 7637-2 and ISO 10605 compliance in 12 V/24 V vehicle architectures, emphasizing planar reliability and high-Tj operation.
FAQ
What is the maximum clamping voltage of SM50T30AY under a 10/1000 µs surge?
The maximum clamping voltage VCL is 42.1 V at 10/1000 µs waveform and Tamb = 25 °C, measured at peak pulse current IPP = 119 A. This value increases with junction temperature at rate αT × (Tj − 25 °C), where αT = 10×10⁻⁴ /°C, ensuring predictable performance up to 175 °C.
Is SM50T30AY bidirectional or unidirectional?
SM50T30AY is unidirectional, indicated by the "AY" suffix (vs. "CAY" for bidirectional). It conducts only when cathode voltage exceeds anode by >VBR, making it suitable for DC power line protection with polarity-defined grounding. The cathode is marked with a bar on the SMC package body.
Does SM50T30AY meet ISO 16750-2 test requirements?
Yes-SM50T30AY is explicitly validated for ISO 16750-2 Test B (load dump) per datasheet Figure 20 and application guidance. It clamps 87 V pulses with td = 150 ms and 400 ms while maintaining VCL < 45 V, satisfying compliance for 24 V vehicle electrical systems.
What is the recommended PCB footprint for SM50T30AY?
The recommended footprint follows IPC7531 and JEDEC MO-136AC standards: pad length 5.11 mm, pad width 1.54 mm, center-to-center spacing 8.19 mm, and copper area ≥4 cm² per lead to achieve Rth(j-a) ≤60 °C/W. Thermal relief vias under pads improve heat dissipation during surge events.
SM50T30AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V (Max)
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 119A
- Power - Peak Pulse:
- 5000W (5kW)
- 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
SM50T30AY FAQ
1.How can I place an order for SM50T30AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SM50T30AY 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 SM50T30AY reliable?
The price and inventory of SM50T30AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM50T30AY is usually 5 days.
3.What payment methods are accepted for SM50T30AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM50T30AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM50T30AY?
SM50T30AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM50T30AY 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 SM50T30AY?
For technical support, including SM50T30AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM50T30AY requirements.
6.How does Aetrix verify that SM50T30AY is sourced from the original manufacturer or authorized distributors?
All SM50T30AY 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 SM50T30AY meets industry standards.
7.What is the process for return or replacement of SM50T30AY?
All SM50T30AY units undergo pre-shipment inspection (PSI). If there is an issue with SM50T30AY, 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 SM50T30AY part is unused and in its original packaging.
Return procedure for SM50T30AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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