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onsemi SMF5.0AT1
- Part No.:
- SMF5.0AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF5.0AT1.pdf
- Description:
- TVS DIODE 5VWM 9.2VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:5,368
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Product details
Overview
SMF5.0AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 5.0 V working peak reverse voltage (VRWM), 9.2 V maximum clamping voltage at 21.7 A peak pulse current, 200 W peak pulse power (10/1000 µs), <1 ns response time, and IEC61000-4-2 Level 4 ESD immunity (>16 kV HBM). It is used in USB ports, battery charging circuits, and low-voltage microcontroller I/O protection.
For engineers reviewing the SMF5.0AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM matching system operating voltage, VC margin relative to IC absolute maximum ratings, surge current capability under IEC 61000-4-4 40 A transients, thermal derating on FR-4 PCBs, and SOD−123FL footprint compatibility with high-density layouts.
Technical Context
The SMF5.0AT1 operates as a Zener-based avalanche clamp: under normal bias it presents <1 µA leakage at 5.0 V VRWM; when exposed to transients exceeding VBR (6.4–6.7 V), it avalanches into low-impedance conduction within <1 ns to limit voltage across protected circuitry. Its 200 W peak power rating applies specifically to the 10/1000 µs waveform per Figure 2.
Thermal performance is defined by RθJA = 325°C/W (on recommended FR-4 pad), enabling 385 mW steady-state dissipation at 25°C ambient, with full derating to zero at 150°C. The SOD−123FL package supports reflow up to 260°C for 10 s and meets MSL 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 5.0 V - Maximum continuous reverse voltage before significant leakage; must be ≥ system nominal rail voltage (e.g., 3.3 V or 5 V bus) |
| VBR @ IT=10 mA | 6.4–6.7 V - Breakdown onset range; defines minimum clamping threshold under fast transients |
| VC @ IPP=21.7 A | 9.2 V max - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs |
| IPP | 21.7 A - Peak pulse current supported at rated clamping voltage; validates compliance with IEC 61000-4-4 40 A test (with appropriate source impedance) |
| Response Time | <1 ns - Enables suppression of ESD events and fast-rising transients before sensitive logic is damaged |
| ESD Rating | >16 kV HBM, IEC61000-4-2 Level 4 - Confirmed immunity to human-body model and contact discharge per industrial standards |
| Package | SOD−123FL - Surface-mount flat-lead package with 1.0 mm max height and 8.45 mm² footprint; compatible with automated placement and reflow |
Pinout & Package
SOD−123FL is a 2-terminal surface-mount package with cathode indicated by a polarity band. Mounting orientation is unrestricted; leads are 100% matte tin, qualified for 260°C reflow (MSL 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to system ground or lower-potential reference; reverse-biased during normal operation; conducts avalanche current during overvoltage |
| 2 (Non-banded End) | Anode | Connected to protected line (e.g., VBUS, data line, or I/O); carries transient current to ground via cathode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL package | 1.0 mm max height enables use in ultra-thin portable devices and tight board spaces without mechanical interference |
| 200 W peak pulse power (10/1000 µs) | Supports robust protection against lightning-induced surges and load-dump transients in automotive and industrial 5 V systems |
| IEC61000-4-4 40 A surge immunity | Validated performance against repetitive 40 A ring-wave transients, critical for industrial Ethernet and CAN bus interface protection |
| ESD immunity >16 kV HBM | Eliminates need for additional ESD diodes on handheld device buttons, touchscreens, and USB connectors |
| Low leakage <1 µA @ VRWM | Prevents excessive quiescent current drain in battery-powered applications such as wearables and IoT sensors |
Applications
| USB Power Delivery Interface | Li-ion Battery Charging Circuit |
|---|---|
|
Use Scenario: Protects 5 V VBUS line from hot-plug transients, ESD during cable insertion, and reverse-voltage faults from faulty adapters. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND, clamping surges before they reach USB controller or power management IC. Use Value: Limits VBUS to ≤9.2 V during 21.7 A transients, preserving USB PD compliance and preventing damage to ±15 V tolerant PHYs. |
Use Scenario: Shields battery protection IC and fuel gauge from voltage spikes induced by charger IC switching noise or adapter disconnect events. IC Role / Device Role / Timing Role: Placed at battery terminal input to absorb 10/1000 µs surges generated by DC-DC converter instability or inductive kickback. Use Value: Maintains battery-side voltage below 9.2 V during 21.7 A pulses, ensuring BMS overvoltage lockout thresholds (typically 4.3–4.5 V/cell) remain untriggered falsely. |
| Microcontroller GPIO Protection | Industrial Sensor Signal Line |
|
Use Scenario: Guards 3.3 V or 5 V digital I/O pins (e.g., UART, I²C) against ESD from user interaction or nearby relay switching. IC Role / Device Role / Timing Role: Connected anode-to-signal line, cathode-to-GND; clamps fast ESD events before MCU input structures break down. Use Value: Responds in <1 ns to 15 kV contact discharge, limiting pin voltage to ≤9.2 V and preventing latch-up or gate oxide rupture in 3.3 V CMOS inputs. |
Use Scenario: Protects analog output (4–20 mA) or digital sensor lines (RS-485, CAN) from induced surges in factory floor wiring harnesses. IC Role / Device Role / Timing Role: Installed at sensor module connector, shunting common-mode transients to chassis ground while preserving signal integrity. Use Value: Withstands repeated 40 A IEC 61000-4-4 surges without degradation, maintaining <1 µA leakage to avoid loading 12-bit ADC reference paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Same VRWM (5.0 V) and VC (9.2 V), but SMA package (higher RθJA = 50°C/W, larger footprint 12.5 mm²) | Less suitable for space-constrained portable designs; better thermal performance only with large copper pours | Select SMAJ5.0A only if board layout allows larger pad area and higher thermal mass is available |
| 1.5SMC5.0A | Higher peak power (1500 W), DO-214AB package (5.3 mm height), VRWM = 5.0 V, VC = 9.2 V | Overqualified for consumer electronics; used where multi-kW surge immunity is mandated (e.g., AC mains interfaces) | Choose 1.5SMC5.0A only when legacy DO-214AB footprint exists or >1 kW surge handling is explicitly required |
Compared with SMAJ5.0A and 1.5SMC5.0A, the SMF5.0AT1 delivers identical electrical clamping performance in a 40% smaller footprint and 60% lower profile-making it optimal for modern compact, battery-powered systems where board area and z-height are constrained.
Availability
SMF5.0AT1 is available at Aetrix Electronics and suitable for USB power delivery interfaces, Li-ion battery charging circuits, microcontroller GPIO protection, and industrial sensor signal lines requiring stable component supply and long-term manufacturability.
Supply support for SMF5.0AT1 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 specializing in energy-efficient silicon and compound semiconductor solutions for automotive, industrial, cloud, and IoT applications.
The SMF5.0AT1 belongs to onsemi's SMF Series of surface-mount TVS diodes, engineered specifically for high-reliability, low-profile overvoltage protection in space- and power-constrained portable and embedded systems.
FAQ
What is the working peak reverse voltage (VRWM) of the SMF5.0AT1?
The SMF5.0AT1 has a VRWM of 5.0 V, meaning it remains in high-impedance state with <1 µA leakage up to this DC or continuous peak reverse voltage. This value ensures compatibility with standard 5 V logic and power rails while providing sufficient margin above typical 3.3 V or 5 V system voltages to avoid false triggering during normal operation.
What is the maximum clamping voltage (VC) for the SMF5.0AT1 under surge conditions?
The SMF5.0AT1 exhibits a maximum clamping voltage (VC) of 9.2 V when subjected to its rated peak pulse current of 21.7 A (10/1000 µs waveform). This VC value defines the upper voltage limit imposed on protected circuitry during transient events and must be verified against the absolute maximum ratings of downstream ICs to ensure safe operation.
Is the SMF5.0AT1 suitable for IEC 61000-4-2 ESD protection?
Yes, the SMF5.0AT1 is rated for >16 kV per Human Body Model (HBM) and meets IEC 61000-4-2 Level 4 (±8 kV contact, ±15 kV air) ESD protection. Its sub-1 ns response time ensures effective suppression of ESD events before damage occurs to sensitive interfaces such as USB, HDMI, or touch controllers in end-user devices.
What package type does the SMF5.0AT1 use, and what are its mounting requirements?
The SMF5.0AT1 uses the SOD−123FL surface-mount package with 2.5–2.9 mm length, 1.5–1.8 mm width, and 1.0 mm max height. It requires a specific footprint per onsemi's recommended pad layout (4.19 × 2.36 mm), supports reflow up to 260°C for 10 seconds, and complies with MSL 1-no dry-pack or baking needed prior to assembly.
How does the SMF5.0AT1 compare to the SMAJ5.0A in terms of physical size and thermal performance?
The SMF5.0AT1 occupies 8.45 mm² with 1.0 mm height in SOD−123FL, whereas the SMAJ5.0A uses the larger SMA package (12.5 mm², 2.3 mm height). Thermally, the SMF5.0AT1 has RθJA = 325°C/W on FR-4, versus ~50°C/W for SMAJ5.0A-but the latter achieves lower junction temperature only with extensive copper pour. For dense layouts, SMF5.0AT1 offers superior area efficiency without sacrificing clamping performance.
SMF5.0AT1 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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- 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
SMF5.0AT1 FAQ
1.How can I place an order for SMF5.0AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF5.0AT1 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 SMF5.0AT1 reliable?
The price and inventory of SMF5.0AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF5.0AT1 is usually 5 days.
3.What payment methods are accepted for SMF5.0AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF5.0AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF5.0AT1?
SMF5.0AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF5.0AT1 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 SMF5.0AT1?
For technical support, including SMF5.0AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF5.0AT1 requirements.
6.How does Aetrix verify that SMF5.0AT1 is sourced from the original manufacturer or authorized distributors?
All SMF5.0AT1 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 SMF5.0AT1 meets industry standards.
7.What is the process for return or replacement of SMF5.0AT1?
All SMF5.0AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF5.0AT1, 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 SMF5.0AT1 part is unused and in its original packaging.
Return procedure for SMF5.0AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF5.0AT1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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