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STMicroelectronics SMTY18AM
- Part No.:
- SMTY18AM
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-216AA
- Datasheet:
-
SMTY18AM.pdf
- Description:
- TVS DIODE 16VWM 20VC DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,559
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Product details
Overview
SMTY18AM from STMicroelectronics is a monolithic Transient Voltage Suppressor (TVS) with integrated low-forward-voltage Schottky diode functionality, designed for ESD protection in portable electronics. It features 16 V stand-off voltage, 400 W peak pulse power (8/20 µs), 0.48 V forward voltage at 0.85 A, 20 V clamping voltage at 1 A, and complies with IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact discharge).
For engineers reviewing the SMTY18AM datasheet, SMTY18AM pinout, SMTY18AM application, or SMTY18AM equivalent, key selection criteria include its dual TVS + Schottky function, ultra-thin 1.0 mm profile, low dynamic impedance (8.8 Ω), junction capacitance of 500 pF at 0 V, and suitability for high-density USB, audio jack, and SIM card interface protection.
Technical Context
The SMTY18AM integrates a bidirectional TVS structure and a low-VF Schottky anode-cathode path in a single DO-216AA (STmite) die. Its clamping behavior is defined by a 20 V max VCL at 1 A IPP, with breakdown initiated at 16 V (VBR) and leakage limited to 1 µA at rated VRM.
Thermal performance is characterized by Rth(j-a) = 250 °C/W on recommended FR4 PCB layout, enabling reliable operation up to Tj = 150 °C. The device achieves fast response (<1 ns) and maintains stable capacitance (500 pF typ. @ 0 V) across operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 16 V - Maximum continuous reverse working voltage before conduction begins |
| Clamping Voltage (VCL) | 20 V @ 1 A - Peak voltage seen by protected circuit during 8/20 µs surge |
| Forward Voltage (VF) | 0.48 V @ 0.85 A - Enables low-loss DC path for signal/power lines requiring Schottky rectification |
| Peak Pulse Power (PPP) | 400 W @ 8/20 µs - Sustains high-energy ESD transients without failure |
| Junction Capacitance (C) | 500 pF @ 0 V - Low enough for USB 2.0 and audio interfaces without signal integrity degradation |
| ESD Rating | 15 kV air / 8 kV contact per IEC 61000-4-2 Level 4 - Meets industrial and consumer port-level immunity requirements |
| Dynamic Impedance (Rd) | 8.8 Ω - Ensures tight clamping margin (VCL/VBR = 1.25) for predictable overvoltage limiting |
Pinout & Package
Package: DO-216AA (STmite), surface-mount, ultra-thin profile (1.00 mm max height), 2-terminal configuration with anode and cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive terminal for forward conduction path | Connects to signal/power line requiring low-VF rectification or DC bias path |
| Cathode (K) | Negative terminal; common node for TVS clamping and Schottky cathode | Typically tied to ground or low-impedance return path to shunt ESD current and provide forward conduction reference |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic TVS + Schottky integration | Eliminates need for separate protection and rectification components, reducing BOM count and board area |
| Ultra-low profile (1.0 mm height) | Enables use in space-constrained portable devices such as smartphones, wearables, and thin tablets |
| Low clamping factor (VCL/VBR = 1.25) | Provides tighter overvoltage margin than standard TVS diodes, improving system robustness |
| Fast ESD response (<1 ns) | Protects sensitive IC inputs before damage occurs during human-body or contact discharge events |
| Thermally optimized pad layout support | Rth(j-a) = 250 °C/W enables sustained operation at 150 °C junction temperature under typical PCB conditions |
Applications
| USB 2.0 Data Lines | Smartphone Audio Jacks |
|---|---|
Use Scenario: Protecting D+ and D− lines against ESD during cable insertion/removal in handheld devices. IC Role / Device Role / Timing Role: Bidirectional TVS clamps transient surges while Schottky path minimizes signal distortion during normal operation. Use Value: 500 pF capacitance and 0.48 V forward drop preserve USB 2.0 eye diagram integrity and reduce DC bias loss. | Use Scenario: Shielding microphone and headset detection pins from user-hand ESD in compact mobile handsets. IC Role / Device Role / Timing Role: Dual-function device provides both ESD suppression and low-loss DC path for jack-sense circuits. Use Value: 16 V stand-off and 20 V clamping ensure compatibility with 3.3 V/5 V audio codec I/O rails without false triggering. |
| SIM Card Interfaces | Portable Medical Sensors |
Use Scenario: Guarding VCC, I/O, and reset lines of hot-pluggable SIM modules against contact discharge. IC Role / Device Role / Timing Role: Monolithic structure delivers coordinated clamping and low-VF biasing for multi-rail SIM slot protection. Use Value: 400 W pulse rating and 15 kV air discharge compliance meet stringent CE/FCC certification requirements. | Use Scenario: Safeguarding analog front-end inputs of wearable biosensors exposed to clinical handling environments. IC Role / Device Role / Timing Role: Functions as combined ESD clamp and low-drop rectifier for battery-charging or sensor-bias paths. Use Value: 1.0 mm height and 15.5 mg weight support miniaturized, lightweight form factors required in FDA-classified devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS + Schottky dual-function applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF16A | Unidirectional TVS only; no Schottky diode; 16 V VBR, 22.5 V VCL @ 1 A | Lacks integrated forward conduction path; requires external Schottky if DC bias needed | Select when only transient suppression is required and board space allows discrete implementation |
| TPD2E007 | Two-channel unidirectional TVS array; 5.5 V VRWM; 12 pF per channel; no Schottky function | Optimized for high-speed data lines (e.g., HDMI, USB 3.0); lower capacitance but no rectification capability | Prefer for high-frequency interfaces where <20 pF capacitance is mandatory and Schottky function is unnecessary |
Compared with SMF16A and TPD2E007, the SMTY18AM uniquely combines ESD clamping and low-VF rectification in one ultra-thin package-enabling simplified design for space-limited, multi-role signal paths where both functions are concurrently required.
Availability
SMTY18AM is available at Aetrix Electronics and suitable for USB interface protection, smartphone audio jack hardening, and SIM card slot safeguarding requiring stable component supply and long-term production continuity.
Supply support for SMTY18AM 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 power management, analog, MEMS, and automotive-grade ICs.
The SMTY18AM belongs to ST's Transky™ family of integrated TVS-Schottky devices, engineered specifically for ESD-hardened portable electronics where board space, height, and functional integration are critical constraints.
FAQ
What is the maximum junction temperature for continuous operation?
The SMTY18AM supports continuous operation up to a maximum junction temperature of 150 °C, validated under specified thermal conditions including Rth(j-a) = 250 °C/W on recommended FR4 PCB layout with copper pour. Derating is required above ambient temperatures where Tj would exceed this limit.
Can SMTY18AM be used for bidirectional signal lines like USB D+/D−?
Yes - the SMTY18AM is inherently bidirectional due to its symmetrical monolithic TVS structure. Its 16 V stand-off and 20 V clamping apply equally in both polarities, making it suitable for differential data lines without polarity concerns or additional external components.
How does the 0.48 V forward voltage impact circuit design?
The 0.48 V forward voltage at 0.85 A enables efficient DC biasing or low-loss rectification in signal paths, reducing power loss and heat generation compared to standard silicon diodes. This value is measured at 25 °C and increases slightly with temperature, remaining below 0.6 V up to 85 °C.
Is the STmite (DO-216AA) package compatible with standard reflow profiles?
Yes - the STmite package is qualified for standard lead-free reflow soldering per J-STD-020. Its epoxy-molded construction and 250 °C peak temperature rating support compatibility with IPC Class 3 assembly processes, including preheat, soak, and reflow stages.
SMTY18AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-216AA
- Series:
- SMTY, Transky™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- 20V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-216AA
SMTY18AM FAQ
1.How can I place an order for SMTY18AM through Aetrix?
Please submit a Request for Quotation (RFQ) for SMTY18AM 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 SMTY18AM reliable?
The price and inventory of SMTY18AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMTY18AM is usually 5 days.
3.What payment methods are accepted for SMTY18AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMTY18AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMTY18AM?
SMTY18AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMTY18AM 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 SMTY18AM?
For technical support, including SMTY18AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMTY18AM requirements.
6.How does Aetrix verify that SMTY18AM is sourced from the original manufacturer or authorized distributors?
All SMTY18AM 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 SMTY18AM meets industry standards.
7.What is the process for return or replacement of SMTY18AM?
All SMTY18AM units undergo pre-shipment inspection (PSI). If there is an issue with SMTY18AM, 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 SMTY18AM part is unused and in its original packaging.
Return procedure for SMTY18AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMTY18AM Tags
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