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onsemi SMF36AT1
- Part No.:
- SMF36AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF36AT1.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:5,627
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Product details
Overview
SMF36AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 36 V working peak reverse voltage (VRWM), 42.1 V minimum breakdown voltage (VBR), 44.2 V maximum clamping voltage (VC) at 58.1 A peak pulse current, and 200 W peak pulse power rating per 10/1000 µs waveform. It is used in portable power supplies and USB interface protection circuits.
For engineers reviewing the SMF36AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, surge current handling under IEC61000-4-4 40 A transients, ESD robustness (>16 kV HBM), and SOD−123FL package thermal performance in high-density layouts.
Technical Context
The SMF36AT1 operates as a Zener-based unidirectional TVS, conducting only during reverse overvoltage events above its VRWM of 36 V. Its low zener impedance ensures stable clamping up to 58.1 A IPP, with sub-1 ns response time enabling suppression of fast ESD and EFT transients before downstream IC damage occurs.
It meets IEC61000−4−2 Level 4 (±8 kV contact / ±15 kV air) and IEC61000−4−4 (40 A, 5/50 ns) immunity standards. The device is rated for −55°C to +150°C operation and qualified to MSL 1 with 260°C reflow compatibility, supporting automated SMT assembly in industrial and consumer end equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min) | 42.1 V @ 1 mA - Ensures reliable turn-on above normal rail variation |
| VC (max) | 44.2 V @ 58.1 A - Limits protected circuit voltage during worst-case 10/1000 µs surge |
| IPP (max) | 58.1 A - Withstands IEC61000-4-4 40 A surge with design margin |
| Leakage (IR) | 1 µA @ 36 V - Negligible standby current in battery-powered systems |
| ESD Rating | >16 kV HBM - Protects against human-body discharge without external shielding |
| Package | SOD−123FL - 2.7 mm × 1.6 mm footprint, 1.0 mm max height for ultra-thin designs |
Pinout & Package
SOD−123FL surface-mount package with cathode indicated by polarity band; 2-terminal configuration optimized for compact PCB layout and thermal conduction through cathode pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to protected line's higher-potential side; primary heat path to PCB copper |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes clamping path during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL | 1.0 mm max height enables use in space-constrained mobile and wearable PCBs |
| Fast response time | <1 ns turn-on ensures suppression of ESD events before IC latch-up or gate oxide rupture |
| IEC61000−4−4 compliance | Rated for 40 A surge current (5/50 ns) - exceeds industrial immunity requirements |
| High surge capability | 200 W peak power (10/1000 µs) supports repeated transient events in power supply inputs |
| Matte tin lead finish | RoHS-compliant, solderable with standard SnPb or lead-free reflow profiles |
Applications
| USB Power Input Protection | Industrial Sensor Signal Line |
|---|---|
Use Scenario: 5 V USB-powered IoT sensor node exposed to hot-plug surges and ESD during field deployment. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND to clamp transients before they reach USB controller and LDO. Use Value: 44.2 V clamping voltage provides 9.2 V margin above 36 V VRWM, ensuring no false triggering during 5.5 V nominal rail tolerance while limiting stress on 6 V-rated USB PHY. | Use Scenario: 24 V analog sensor output line routed across noisy factory floor with motor drives and relay switching. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt inductive kickback and EFT bursts to ground. Use Value: 58.1 A peak pulse current rating handles repetitive 40 A IEC61000-4-4 surges without degradation, extending field reliability beyond 100,000 cycles. |
| Portable Medical Device Battery Rail | Automotive Body Control Module (BCM) Interface |
Use Scenario: Li-ion powered handheld diagnostic tool with exposed charging port subject to accidental 12 V adapter misconnection. IC Role / Device Role / Timing Role: Reverse-polarity and overvoltage protector on main battery input rail upstream of protection FET and charger IC. Use Value: 36 V VRWM allows safe operation up to 33 V (10% derated), covering 12 V/24 V dual-input designs while clamping misapplied 12 V to ≤44.2 V to prevent downstream IC damage. | Use Scenario: LIN bus transceiver input in BCM exposed to load dump and ISO 7637-2 pulse 1/2a transients. IC Role / Device Role / Timing Role: Secondary clamping device after primary TVS, absorbing residual energy that passes through front-end filter. Use Value: SOD−123FL package enables placement within 2 mm of connector, minimizing trace inductance to preserve <1 ns response and maintain clamping efficacy at 200 MHz+ frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Same VRWM (36 V) and VC (44.2 V), but SMA package (4.5 mm × 2.7 mm) - 3.5× larger footprint | Less suitable for ultra-compact layouts; higher thermal resistance (RθJA = 50°C/W vs. 325°C/W) | Select when board space permits and higher steady-state power dissipation (400 W) is required |
| P6SMB36A | Higher peak power (600 W), DO-214AA package (4.5 mm × 3.9 mm), 100 ns response time | Better for high-energy load dump; slower than SMF36AT1 for ESD, requiring additional ESD-specific protection | Select for automotive 12 V systems needing ISO 7637-2 compliance where PCB area is not constrained |
Compared with SMAJ36A and P6SMB36A, the SMF36AT1 delivers superior high-frequency transient suppression in minimal area due to its SOD−123FL package and sub-1 ns response, making it optimal for space-limited, ESD-critical applications like portable electronics and high-speed interfaces - without requiring PCB redesign.
Availability
SMF36AT1 is available at Aetrix Electronics and suitable for USB power input protection, industrial sensor signal line hardening, and portable medical device battery rail safeguarding requiring stable component supply across production lifecycles.
Supply support for SMF36AT1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SMF series belongs to onsemi's transient voltage suppressor product line, engineered specifically for high-reliability, low-footprint overvoltage protection in portable, battery-powered, and space-constrained electronic systems.
FAQ
What is the clamping voltage of SMF36AT1 at its rated peak pulse current?
The SMF36AT1 has a maximum clamping voltage (VC) of 44.2 V at its rated peak pulse current (IPP) of 58.1 A under the 10/1000 µs waveform. This value is guaranteed per the manufacturer's datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. Maintaining this clamping level ensures downstream components rated for 45 V or higher remain within safe operating limits when SMF36AT1 is correctly applied.
Is SMF36AT1 suitable for bidirectional transient protection?
No, SMF36AT1 is a unidirectional TVS diode, designed to clamp only reverse-polarity transients above its 36 V VRWM. It does not protect against positive-going surges on grounded lines. For bidirectional protection, a symmetric TVS such as SMBJ36CA or an external series capacitor would be required. Using SMF36AT1 in bidirectional configurations may result in forward conduction and failure during positive transients - always verify polarity alignment in the SMF36AT1 application schematic.
What is the maximum operating temperature range for SMF36AT1?
The SMF36AT1 is specified for an operating and storage temperature range of −55°C to +150°C. Its junction-to-ambient thermal resistance (RθJA) is 325°C/W when mounted on the recommended minimum pad size per the datasheet, enabling reliable operation in extended-temperature environments such as automotive engine compartments or industrial control cabinets. Derating curves confirm usable power dissipation down to −40°C ambient without performance loss in the SMF36AT1 design.
Does SMF36AT1 meet IEC61000-4-2 and IEC61000-4-4 immunity standards?
Yes, SMF36AT1 is rated for ESD immunity per IEC61000−4−2 Level 4 (±8 kV contact, ±15 kV air) and electrical fast transient (EFT) immunity per IEC61000−4−4 (40 A, 5/50 ns). These ratings are validated in the official onsemi datasheet and reflect actual test performance - not theoretical capability. When placed within 2 mm of the threat entry point with low-inductance grounding, SMF36AT1 provides system-level compliance without supplemental protection in most consumer and industrial applications.
What is the leakage current specification for SMF36AT1 at its working voltage?
The SMF36AT1 exhibits a maximum reverse leakage current (IR) of 1 µA at its working peak reverse voltage (VRWM) of 36 V, measured at 25°C. This ultra-low leakage ensures negligible power drain in battery-operated devices and prevents false triggering in high-impedance sensing circuits. The value remains below 5 µA across the full −55°C to +125°C operating range, confirming stable performance in SMF36AT1 deployments where standby current budget is critical.
SMF36AT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SOD-123F
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 3.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123FL
SMF36AT1 FAQ
1.How can I place an order for SMF36AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF36AT1 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 SMF36AT1 reliable?
The price and inventory of SMF36AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF36AT1 is usually 5 days.
3.What payment methods are accepted for SMF36AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF36AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF36AT1?
SMF36AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF36AT1 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 SMF36AT1?
For technical support, including SMF36AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF36AT1 requirements.
6.How does Aetrix verify that SMF36AT1 is sourced from the original manufacturer or authorized distributors?
All SMF36AT1 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 SMF36AT1 meets industry standards.
7.What is the process for return or replacement of SMF36AT1?
All SMF36AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF36AT1, 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 SMF36AT1 part is unused and in its original packaging.
Return procedure for SMF36AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF36AT1 Tags
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ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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