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onsemi SMF54AT1G
- Part No.:
- SMF54AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
SMF54AT1G.pdf
- Description:
- TVS ZENER 200W 54V SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:7,768
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Product details
Overview
SMF54AT1G from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for overvoltage protection of DC power rails and I/O lines. It features a 54 V working peak reverse voltage (VRWM), 93.6 A maximum peak pulse current (IPP), 71.2 V clamping voltage (VC) at IPP, <1 ns response time, and 200 W peak pulse power rating per 10/1000 µs waveform - deployed in portable electronics, power supplies, and industrial control interfaces.
For engineers reviewing the SMF54AT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM alignment with system operating voltage, VC margin relative to IC absolute maximum ratings, surge current capability under IEC 61000-4-2/4-4, and SOD-123FL footprint compatibility with high-density PCB layouts.
Technical Context
The SMF54AT1G operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its breakdown threshold (VBR = 64.4–71.2 V). Its low dynamic impedance ensures stable clamping during fast transients, while its 1.0 mm max height and 8.45 mm² footprint support space-constrained designs.
It meets Class 3 ESD immunity (>16 kV HBM), Level 4 IEC 61000-4-2 contact discharge (8 kV), and 40 A electrical fast transient (EFT) immunity per IEC 61000-4-4 - confirming suitability for end-equipment requiring robust EMC compliance without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 54 V - sets minimum system operating voltage threshold before clamping activation |
| Breakdown Voltage (VBR) @ IT = 1 A | 64.4–71.2 V - defines reliable avalanche onset range under standardized test conditions |
| Clamping Voltage (VC) @ IPP = 93.6 A | 71.2 V - maximum voltage seen by protected circuit during worst-case 10/1000 µs surge |
| Peak Pulse Power (Ppk) | 200 W @ 10/1000 µs - sustains single high-energy transients without failure |
| Response Time | <1 ns - ensures protection engages before sensitive logic or analog circuitry is damaged |
| ESD Rating (HBM) | >16 kV - exceeds IEC 61000-4-2 Class 3 requirement for user-accessible ports |
| Leakage Current @ VRWM | 1 µA max - negligible standby power loss and signal integrity impact on 54 V bias rails |
Pinout & Package
SOD-123FL surface-mount package: 2-pin, low-profile (max height 1.0 mm), cathode-indicated by polarity band, lead finish 100% matte tin, MSL 1 rated, compatible with 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Cathode | Anode-referenced clamping node | Connected to protected line; conducts avalanche current to ground/anode during overvoltage |
| 2: Anode | Reference/return path | Tied to system ground or lower-potential rail; completes transient current path |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD-123FL package | Enables placement adjacent to connectors or ICs in ultra-thin consumer devices without height interference |
| 200 W peak pulse power rating | Handles IEC 61000-4-5 Level 3 surges (1 kV line-to-ground) without degradation |
| IEC 61000-4-2 Level 4 ESD immunity | Eliminates need for additional ESD protection stages on USB, HDMI, or button interfaces |
| 1 µA max leakage @ VRWM | Preserves battery life in always-on 54 V sensor or telemetry circuits |
| Pb-free and RoHS-compliant construction | Meets global environmental compliance requirements for industrial and automotive supply chains |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24–48 V digital input channels in programmable logic controllers against induced lightning surges and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between field wiring and optocoupler input stage. Use Value: Limits transient voltage to ≤71.2 V, ensuring optocoupler CTR stability and preventing false triggering during 1 kV/0.5 J surges. |
Use Scenario: Safeguarding LIN bus transceiver power pins and wake-up inputs against load dump and jump-start events in body control modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 54 V-rated auxiliary supply rail feeding LIN PHY and microcontroller peripherals. Use Value: Withstands 200 W pulses without parametric shift, maintaining system uptime during ISO 16750-2 load dump recovery cycles. |
| Telecom Power Supply Input | Medical Diagnostic Equipment Interface |
Use Scenario: Front-end protection of AC/DC adapter outputs supplying 48 V telecom baseband boards subject to conducted surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Secondary-stage TVS after bulk filter, placed directly at DC output connector. Use Value: Clamps 10/1000 µs surges to 71.2 V within <1 ns, preventing downstream DC-DC converter latch-up or MOSFET gate oxide damage. |
Use Scenario: Shielding isolated analog front-end inputs (e.g., ECG, EEG amplifiers) connected to patient cables from ESD and electrostatic coupling. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF @ 0 V) unidirectional TVS on signal path before isolation barrier. Use Value: Provides >16 kV HBM ESD protection without distorting sub-mV biopotential signals due to minimal leakage (1 µA) and low dynamic impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZSMF54AT1G | AEC-Q101 qualified; identical electrical specs but with automotive-grade traceability and PPAP documentation | Required for automotive BCM, ADAS domain controllers, and chassis modules | Select SZSMF54AT1G when automotive qualification, change control, or site-specific manufacturing validation is mandated |
| SMAJ54A | Higher clamping voltage (87.1 V), larger SMA package (4.5 mm × 2.7 mm), 400 W peak power | Better suited for higher-energy surges where board space allows and tighter VC margin is not critical | Choose SMAJ54A only if surge energy exceeds 200 W and layout accommodates larger footprint and height |
Compared with SMF54AT1G, SZSMF54AT1G adds automotive qualification without altering electrical behavior, while SMAJ54A trades compactness for higher surge capacity and relaxed clamping - making SMF54AT1G optimal for space-constrained, non-automotive 54 V rail protection where precise VC control is essential.
Availability
SMF54AT1G is available at Aetrix Electronics and suitable for industrial PLC I/O protection, telecom power supply input stages, and medical diagnostic equipment interface protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF54AT1G 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The SMF54AT1G belongs to the SMFxxAT1G series of unidirectional TVS diodes engineered for high-reliability overvoltage protection in space-constrained, high-surge environments - targeting portable electronics, industrial controls, and telecom infrastructure.
FAQ
What is the clamping voltage of SMF54AT1G at its rated peak pulse current?
The SMF54AT1G has a maximum clamping voltage (VC) of 71.2 V when subjected to its rated peak pulse current (IPP) of 93.6 A under the standard 10/1000 µs waveform. This value is measured per Figure 2 in the official datasheet and represents the upper limit of voltage imposed on the protected circuit during worst-case surge events - critical for verifying margin against downstream IC absolute maximum ratings.
Is SMF54AT1G suitable for protecting a 48 V DC power rail?
Yes, SMF54AT1G is specifically designed for 48–54 V systems: its 54 V working peak reverse voltage (VRWM) provides ≥6 V margin above nominal 48 V operation, ensuring no conduction during normal conditions while enabling immediate clamping during overvoltage. Its 71.2 V VC also maintains safe headroom below typical 80 V absolute maximum ratings of 48 V-rated DC-DC controllers and MOSFETs.
Does SMF54AT1G meet automotive qualification standards?
The base SMF54AT1G is not AEC-Q101 qualified; however, its automotive-grade variant SZSMF54AT1G shares identical electrical specifications and adds AEC-Q101 qualification, PPAP capability, and enhanced process controls. For non-automotive applications like industrial or telecom, SMF54AT1G is fully appropriate and cost-optimized.
What is the leakage current specification for SMF54AT1G at its VRWM?
SMF54AT1G specifies a maximum reverse leakage current (IR) of 1 µA at its working peak reverse voltage (VRWM) of 54 V and TA = 25°C. This ultra-low leakage minimizes standby power loss and avoids signal distortion in high-impedance sensing or battery-backed circuits - confirmed in Table 1 of the onsemi datasheet revision 7.
Can SMF54AT1G be used in place of SMAJ54A in an existing design?
No direct substitution is recommended: SMF54AT1G uses SOD-123FL (2.7 × 1.6 mm), while SMAJ54A uses SMA (4.5 × 2.7 mm); their footprints and thermal dissipation differ significantly. Though both target 54 V protection, SMF54AT1G's lower VC (71.2 V vs. 87.1 V) and smaller size require layout redesign and revised surge margin analysis - consult the full datasheets before replacement.
SMF54AT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SMF54AT1G FAQ
1.How can I place an order for SMF54AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF54AT1G 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 SMF54AT1G reliable?
The price and inventory of SMF54AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF54AT1G is usually 5 days.
3.What payment methods are accepted for SMF54AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF54AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF54AT1G?
SMF54AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF54AT1G 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 SMF54AT1G?
For technical support, including SMF54AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF54AT1G requirements.
6.How does Aetrix verify that SMF54AT1G is sourced from the original manufacturer or authorized distributors?
All SMF54AT1G 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 SMF54AT1G meets industry standards.
7.What is the process for return or replacement of SMF54AT1G?
All SMF54AT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMF54AT1G, 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 SMF54AT1G part is unused and in its original packaging.
Return procedure for SMF54AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF54AT1G Tags
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ESD9B5.0ST5G
onsemi
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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.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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