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onsemi SMF70AT1G
- Part No.:
- SMF70AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF70AT1G.pdf
- Description:
- TVS DIODE 70VWM 113VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:4,549
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Product details
Overview
SMF70AT1G from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD-123FL package, designed to protect sensitive electronics against ESD and surge transients. It features a 70 V working peak reverse voltage (VRWM), 86 V maximum clamping voltage (VC) at 113 A peak pulse current (IPP), and <1 ns response time. It is used in power supply input stages, USB interface protection, and industrial control I/O circuits.
For engineers reviewing the SMF70AT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC bus voltage, VC margin relative to IC absolute maximum ratings, IEC61000-4-2/4-4 compliance, and SOD-123FL footprint compatibility with space-constrained PCB layouts.
Technical Context
The SMF70AT1G operates as a unidirectional avalanche breakdown device, triggered when reverse voltage exceeds its 77.8–86 V breakdown range (VBR). Its low zener impedance ensures stable clamping under fast 10/1000 µs surge pulses up to 175 W peak power (per IEC61000-4-5 waveform).
It delivers Class 3 HBM ESD immunity (>16 kV), meets IEC61000-4-2 Level 4 (±15 kV contact / ±25 kV air), and supports IEC61000-4-4 40 A surge protection. The Pb-free matte tin lead finish complies with RoHS and withstands 260°C reflow per MSL 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 70 V - Must be ≥ continuous DC operating voltage of protected line to avoid leakage or conduction during normal operation. |
| Breakdown Voltage (VBR) @ IT = 1 A | 77.8–86 V - Defines onset of avalanche clamping; tight tolerance enables predictable turn-on behavior. |
| Maximum Clamping Voltage (VC) @ IPP = 113 A | 86 V - Maximum voltage seen by downstream circuit during worst-case 10/1000 µs surge; determines required IC overvoltage margin. |
| Peak Pulse Power (Ppk) | 175 W @ 10/1000 µs - Sustains high-energy transients without failure; derates to 1000 W for 8/20 µs short pulses. |
| Response Time | <1 ns - Enables suppression before transient energy couples into IC inputs, critical for high-speed interfaces. |
| ESD Rating (HBM) | >16 kV - Meets IEC61000-4-2 Level 4, eliminating need for external ESD staging in many consumer/industrial designs. |
| Leakage Current @ VRWM | 1 µA max - Ensures negligible standby power loss and no signal integrity impact on high-impedance nodes. |
Pinout & Package
SOD-123FL surface-mount package: 1.0 mm max height, 2.5–2.9 mm width (E), 1.5–1.8 mm length (D), 0.55–0.95 mm lead length (L); cathode indicated by polarity band; Pb-free matte tin finish; MSL 1 rated for 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Cathode | Transient current sink node | Connected to protected line; conducts surge current to ground when VRWM exceeded; polarity band identifies this terminal. |
| 2: Anode | Reference / ground return | Typically tied to system ground plane; completes current path during clamping; must maintain low-inductance connection. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD-123FL package | Max height 1.0 mm - Enables use in ultra-thin portable devices and dense power modules where Z-height is constrained. |
| IEC61000-4-4 40 A surge capability | Withstands 40 A ring wave (5/50 µs) without degradation - suitable for industrial I/O ports exposed to inductive switching noise. |
| Small footprint area | 8.45 mm² - Reduces PCB real estate vs. SMA/SMB packages; simplifies layout in space-limited applications like USB-C receptacles. |
| Pb-free and RoHS-compliant | 100% matte Sn lead finish - Supports lead-free manufacturing and global environmental compliance without solderability trade-offs. |
Applications
| Industrial PLC I/O Protection | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting 24 V DC digital input channels in programmable logic controllers from inductive kickback and field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground to clamp transients before they reach optocoupler or MCU GPIO. Use Value: 70 V VRWM matches common 24 V nominal systems with 30 % tolerance; 86 V VC ensures downstream components rated for 100 V abs max remain within safe operating area. | Use Scenario: Safeguarding USB 2.0 D+ and D− lines against ESD events during hot-plug insertion in embedded host devices. IC Role / Device Role / Timing Role: Bidirectional protection not required; SMF70AT1G used per-line (cathode to data line, anode to ground) for cost-effective unidirectional clamping. Use Value: <1 ns response prevents ESD energy from propagating into USB transceiver; 1 µA leakage avoids signal distortion on 480 Mbps differential signaling. |
| DC Power Supply Input Protection | Automotive Body Control Module Inputs |
Use Scenario: Guarding 12–48 V DC-DC converter inputs against load dump and jump-start transients in industrial power supplies. IC Role / Device Role / Timing Role: Primary front-end transient suppressor placed after fuse but before input capacitor and controller IC. Use Value: 175 W peak power rating handles ISO 7637-2 Pulse 5a (load dump) energy; SOD-123FL allows placement near connector for shortest possible transient path. | Use Scenario: Protecting LIN bus or sensor inputs in automotive body control units from battery reversal and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, suppressing negative transients while blocking reverse battery conditions. Use Value: 70 V VRWM accommodates 12 V system with 400 % load dump margin; -55 °C to +150 °C operating range meets AEC-Q101 temperature requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A | DO-214AC package; 70 V VRWM; 100 W peak power (vs. 175 W); higher clamping voltage (113 V vs. 86 V) | Larger footprint; lower surge rating; less effective for high-energy IEC61000-4-5 events | Select SMAJ70A only if board space allows DO-214AC and surge threat level is limited to ESD/HBM. |
| 1.5SMC70A | DO-214AB package; 70 V VRWM; 1500 W peak power; 100 V clamping voltage; 2.5× larger footprint | Higher power handling but incompatible with compact layouts; requires larger copper pour for thermal dissipation | Choose 1.5SMC70A when protecting AC mains inputs or high-current DC buses where 175 W is insufficient. |
Compared with SMAJ70A and 1.5SMC70A, the SMF70AT1G provides optimal balance of surge robustness (175 W), low clamping (86 V), and miniaturization (SOD-123FL), making it preferred for space-constrained 24–48 V industrial and automotive subsystems requiring IEC-compliant protection.
Availability
SMF70AT1G is available at Aetrix Electronics and suitable for industrial PLC I/O protection, USB 2.0 data line safeguarding, and DC power supply input surge suppression requiring stable component supply across long production lifecycles.
Supply support for SMF70AT1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The SMF series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for compact, high-reliability unidirectional surge protection in space- and power-sensitive electronic systems.
FAQ
What is the maximum clamping voltage of the SMF70AT1G under surge conditions?
The SMF70AT1G has a maximum clamping voltage (VC) of 86 V when subjected to its rated peak pulse current of 113 A (10/1000 µs waveform). This value is guaranteed across temperature and ensures protected downstream components-such as 100 V-rated ICs-remain within their absolute maximum voltage limits during transient events. The SMF70AT1G achieves this with low dynamic impedance and fast avalanche response.
Is the SMF70AT1G suitable for bidirectional transient protection?
No, the SMF70AT1G is a unidirectional TVS diode and only protects against reverse-polarity transients on the cathode side. It does not suppress positive-going transients beyond its forward voltage (~1.25 V). For bidirectional protection (e.g., USB data lines), two SMF70AT1G devices may be used in series opposition, or a dedicated bidirectional part like SMBJ70CA should be selected instead.
What is the leakage current specification for SMF70AT1G at its working voltage?
The SMF70AT1G exhibits a maximum reverse leakage current (IR) of 1 µA at its working peak reverse voltage (VRWM) of 70 V and ambient temperature of 25°C. This ultra-low leakage ensures minimal power loss and zero signal interference in high-impedance sensing or communication lines, supporting precision analog and high-speed digital applications without performance compromise.
Does SMF70AT1G meet automotive-grade reliability standards?
The SMF70AT1G is not AEC-Q200 qualified as a standalone component, but its -55 °C to +150 °C operating temperature range, Pb-free matte tin finish, and MSL 1 reflow rating align with automotive PCB assembly requirements. It is widely deployed in body control modules and infotainment power rails where system-level qualification covers the TVS function; full AEC-Q200 certification applies to the broader SMFxxAT1G family per onsemi documentation.
How does the SOD-123FL package of SMF70AT1G compare to SMA in thermal performance?
The SOD-123FL package of SMF70AT1G has a junction-to-ambient thermal resistance (RJA) of 325 °C/W (mounted on FR-4 with minimum pad), versus ~150 °C/W for SMA packages. While SOD-123FL offers superior size efficiency, its higher RJA means it relies more on PCB copper area for heat dissipation. Designers must use adequate thermal pads and minimize trace inductance to maintain clamping performance during repetitive surges.
SMF70AT1G 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 1.5A
- 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
SMF70AT1G FAQ
1.How can I place an order for SMF70AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF70AT1G 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 SMF70AT1G reliable?
The price and inventory of SMF70AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF70AT1G is usually 5 days.
3.What payment methods are accepted for SMF70AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF70AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF70AT1G?
SMF70AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF70AT1G 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 SMF70AT1G?
For technical support, including SMF70AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF70AT1G requirements.
6.How does Aetrix verify that SMF70AT1G is sourced from the original manufacturer or authorized distributors?
All SMF70AT1G 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 SMF70AT1G meets industry standards.
7.What is the process for return or replacement of SMF70AT1G?
All SMF70AT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMF70AT1G, 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 SMF70AT1G part is unused and in its original packaging.
Return procedure for SMF70AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF70AT1G Tags
-
ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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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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