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onsemi 1SMA64AT3G
- Part No.:
- 1SMA64AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA64AT3G.pdf
- Description:
- TVS DIODE 64VWM 103VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,216
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Product details
Overview
1SMA64AT3G from onsemi is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 64 V working peak reverse voltage (VRWM), 74.85 V nominal breakdown voltage (VBR) at 1 mA test current, 103 A maximum peak pulse current (IPP), and clamps to ≤103 V at IPP - used in automotive power supply protection and industrial I/O interface surge suppression.
For engineers reviewing the 1SMA64AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < protected IC's absolute maximum rating, fast <1 ns response time, and SMA package compatibility with automated SMT assembly for high-reliability board-level ESD/surge hardening.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown above VRWM. Its low zener impedance and fast <1 ns response enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges per IEC 61000-4-2/4-5.
The device uses a planar junction structure in an SMA (DO-214AC) package with cathode indicated by a molded band. Thermal resistance from junction to lead is 20 °C/W, supporting 1.5 W DC dissipation at 75 °C ambient when mounted on a 1″² copper pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 400 W @ 1 ms 10/1000 µs waveform - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 64 V - sets minimum standoff voltage before clamping begins; must exceed circuit's max continuous DC voltage |
| Breakdown Voltage (VBR) | 74.85 V (nominal) @ 1 mA - defines precise avalanche onset point under controlled test conditions |
| Clamping Voltage (VC) | ≤103 V @ IPP = 103 A - maximum voltage seen by downstream circuit during worst-case surge |
| Response Time | <1 ns - ensures clamping activation prior to damage threshold of sensitive logic or analog ICs |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - qualifies for robust board-level ESD immunity in end equipment |
Pinout & Package
SMA (DO-214AC) surface-mount plastic package with flat handling surface, low profile, and cathode polarity indicated by molded band. Designed for top-side or bottom-side PCB mounting with Pb-free termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Surge current return path | Connected to ground or lower-potential rail; carries full IPP during clamping event |
| Cathode | Avalanche breakdown terminal / Clamping voltage reference | Connected to protected line; voltage at this node is clamped to VC during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise overvoltage protection on positive-rail systems without forward-conduction interference |
| Low zener impedance | Maintains stable clamping voltage across wide IPP range, minimizing voltage overshoot during surge decay |
| Flat handling surface | Ensures consistent pick-and-place accuracy and coplanarity during automated SMT assembly |
| Pb-free Surmetic™ package | Meets RoHS Directive 2011/65/EU and supports lead-free reflow profiles up to 260°C for 10 s |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed between power input and upstream DC-DC converter input. Use Value: Limits transient voltage to ≤103 V, preventing damage to 36 V-rated input stages while surviving 400 W pulses. |
Use Scenario: 24 V digital input modules receiving signals from field sensors in factory automation. IC Role / Device Role / Timing Role: Front-end surge limiter on isolated input channel before optocoupler or level-shifter. Use Value: Suppresses IEC 61000-4-4 EFT bursts and 61000-4-5 surge events without degrading signal integrity or adding capacitance. |
| Medical Equipment Power Entry | Telecom Line Card Surge Suppression |
Use Scenario: AC/DC front-end of Class II medical power supplies requiring reinforced isolation and low leakage. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary MOV, protecting bridge rectifier and bulk capacitor. Use Value: Provides precise 64 V VRWM standoff with <2.5 µA IR @ VRWM, avoiding unnecessary standby current drain. |
Use Scenario: Protection of Ethernet PHY interfaces and PoE-powered devices against induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Common-mode TVS pair (with complementary device) on differential pairs entering magnetics. Use Value: Fast <1 ns response captures high-frequency surge energy before it couples into sensitive PHY circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | 600 W peak power, SMB package (DO-214AA), higher thermal resistance (RJA = 30 °C/W) | Better surge margin but larger footprint; requires more PCB area and has slower thermal recovery | Select when higher single-pulse energy tolerance is required and board space allows SMB size |
| 1.5SMC64A | 1500 W peak power, SMC package (DO-214AB), 2× larger body, RJA = 15 °C/W | Designed for higher-power industrial mains protection; over-specified for low-voltage DC rails | Choose only if system-level surge testing exceeds IEC 61000-4-5 Level 4 and 400 W is insufficient |
Compared with SMBJ64A and 1.5SMC64A, the 1SMA64AT3G offers optimal balance of 400 W surge capability, compact SMA footprint, and proven reliability in space-constrained 12–24 V DC systems - making it preferred for automotive control units and industrial edge nodes where layout density and cost are critical.
Availability
1SMA64AT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and medical power supply designs requiring stable component supply and long-term obsolescence management.
Supply support for 1SMA64AT3G 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 solutions for automotive, industrial, cloud, and IoT applications.
The 1SMAxxAT3G series belongs to onsemi's transient voltage suppressor product line, engineered specifically for board-level ESD and surge protection in cost-sensitive, high-volume SMT applications with strict reliability requirements.
FAQ
What is the maximum clamping voltage of the 1SMA64AT3G under surge conditions?
The 1SMA64AT3G clamps to a maximum of 103 V when subjected to its rated peak pulse current of 103 A (10/1000 µs waveform). This value is measured per standard test conditions in the datasheet and represents the highest voltage that will appear across the protected circuit during a worst-case transient event - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is the 1SMA64AT3G suitable for bidirectional signal line protection?
No, the 1SMA64AT3G is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. It conducts only during negative transients relative to its cathode. For bidirectional applications such as RS-485 or USB data lines, a dedicated bidirectional part like 1SMA64CAT3 must be used instead - the "C" suffix denotes symmetrical clamping in both polarities.
What is the thermal resistance and power derating behavior of the 1SMA64AT3G?
The 1SMA64AT3G has a thermal resistance from junction to lead (RJL) of 20 °C/W and a junction-to-ambient (RJA) of 250 °C/W on FR-4 board. Its DC power dissipation is 1.5 W at 75 °C case temperature, derating linearly at 20 mW/°C above that. At 25 °C ambient, it supports 0.5 W continuous dissipation - sufficient for leakage-limited standby operation but not for sustained forward conduction.
How does the 1SMA64AT3G compare to standard Zener diodes in overvoltage protection?
Unlike general-purpose Zener diodes, the 1SMA64AT3G is optimized for transient suppression: it delivers 400 W peak power handling, <1 ns response, and guaranteed clamping performance under standardized surge waveforms. Standard Zeners lack defined IPP, VC, or surge lifetime ratings - making the 1SMA64AT3G the appropriate choice for IEC-compliant system-level surge protection rather than simple voltage regulation.
What packaging and compliance information applies to the 1SMA64AT3G?
The 1SMA64AT3G is supplied in Pb-free SMA (DO-214AC) tape-and-reel packaging (5000 units per reel), compliant with RoHS Directive 2011/65/EU. Its Surmetic™ plastic case is void-free, corrosion-resistant, and qualified for soldering at 260 °C for 10 seconds. The "G" suffix explicitly confirms Pb-free construction per onsemi's environmental policy.
1SMA64AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 205pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA64AT3G FAQ
1.How can I place an order for 1SMA64AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA64AT3G 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 1SMA64AT3G reliable?
The price and inventory of 1SMA64AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA64AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA64AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA64AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA64AT3G?
1SMA64AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA64AT3G 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 1SMA64AT3G?
For technical support, including 1SMA64AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA64AT3G requirements.
6.How does Aetrix verify that 1SMA64AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA64AT3G 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 1SMA64AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA64AT3G?
All 1SMA64AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA64AT3G, 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 1SMA64AT3G part is unused and in its original packaging.
Return procedure for 1SMA64AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA64AT3G 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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