My Inquiry
My Account
onsemi 1SMA5.0AT3
- Part No.:
- 1SMA5.0AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5.0AT3.pdf
- Description:
- TVS DIODE 5VWM 9.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,672
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMA5.0AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) with 5.0 V working peak reverse voltage, 6.7 V minimum breakdown voltage at 10 mA test current, and 9.2 V clamping voltage at 43.5 A peak pulse current. It protects sensitive electronics in DC power supplies and automotive ECUs against ESD and lightning-induced surges.
For engineers reviewing the 1SMA5.0AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < IC absolute maximum rating, fast <1 ns response time, and SMA package compatibility with automated SMT assembly.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device: under normal bias it presents high impedance (≤400 µA leakage at 5.0 V), but conducts heavily when reverse voltage exceeds VBR (~6.7–7.0 V), limiting transient energy by clamping to ≤9.2 V at 43.5 A. Its low zener impedance ensures stable clamping across surge currents.
Designed for single-polarity overvoltage protection, it uses a planar junction structure in a void-free Surmetic™ plastic package (CASE 403D-02), rated for −65°C to +150°C operation and 260°C soldering (10 s). Thermal resistance is 250°C/W junction-to-ambient on FR-4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 5.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/typ/max) | 6.4 / 6.7 / 7.0 V @ 10 mA - Ensures reliable turn-on above nominal rail while avoiding false triggering |
| VC @ IPP | 9.2 V @ 43.5 A - Clamping voltage must stay below protected IC's absolute max rating |
| PPK | 400 W @ 1 ms - Peak surge energy handling per IEC 61000-4-5 10/1000 µs waveform |
| Response Time | <1 ns - Fast enough to protect CMOS inputs and high-speed logic from ESD |
| ESD Rating | Class 3 (>16 kV HBM) - Meets IEC 61000-4-2 Level 4 for system-level ESD immunity |
| Package | SMA (CASE 403D-02) - Standard surface-mount outline with cathode band marking |
Pinout & Package
SMA package (CASE 403D-02): flat, low-profile, plastic surface-mount case with molded cathode polarity notch or band. Dimensions: 4.06 × 2.29 × 1.91 mm (L × W × H); weight ≈ 0.09 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-biased operation | Connected to system ground or lower-potential rail; defines clamping reference point |
| Cathode | Transient current sink terminal | Connected to protected line (e.g., 5 V rail); conducts surge current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without degradation |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream ICs during transients |
| Flat handling surface | Enables precise pick-and-place placement in high-volume SMT lines |
| Pb-free option (1SMA5.0AT3G) | Complies with RoHS Directive 2011/65/EU without sacrificing surge performance |
| −65°C to +150°C operating range | Supports under-hood automotive and industrial environments with wide thermal cycling |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 5 V microcontroller supply rails in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between 5 V rail and chassis ground. Use Value: Limits transient voltage to 9.2 V, preventing latch-up or gate oxide damage in MCU power pins. | Use Scenario: Safeguarding digital input channels of programmable logic controllers receiving 24 V DC sensor signals. IC Role / Device Role / Timing Role: Unidirectional suppressor mounted at connector entry point to absorb field-wiring induced surges. Use Value: Withstands repeated 400 W surges while maintaining ≤400 µA leakage at 24 V standby. |
| USB Port ESD Protection | DC-DC Converter Output Clamp |
Use Scenario: Secondary-level ESD protection on VBUS line of USB 2.0 host ports after primary TVS array. IC Role / Device Role / Timing Role: Final-stage clamp ensuring <1 ns response to ±15 kV contact discharge (IEC 61000-4-2). Use Value: Class 3 HBM rating and sub-10 V clamping prevent PHY IC damage during hot-plug events. | Use Scenario: Output overvoltage clamp on isolated 5 V DC-DC converter supplying FPGA core voltage. IC Role / Device Role / Timing Role: Fail-safe shunt element triggered only during regulator fault or feedback loop loss. Use Value: 9.2 V clamping guarantees FPGA I/O tolerance (typically 5.5 V abs max) remains unexceeded. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0A | 600 W peak power, same VRWM/VBR/VC specs, SMB package (larger footprint) | Better surge margin but requires PCB area increase; higher thermal mass slows response slightly | Choose when 600 W IEC 61000-4-5 Level 4 compliance is mandatory and layout allows SMB size |
| 1N6104A | Same SMA package, 400 W rating, but VRWM = 4.3 V and VBR = 5.3–5.9 V (lower threshold) | Earlier generation; tighter VBR tolerance not specified; no Class 3 ESD rating documented | Acceptable for cost-sensitive legacy designs where 4.3 V VRWM suffices and ESD >16 kV is not required |
Compared with SMBJ5.0A and 1N6104A, the 1SMA5.0AT3 delivers optimal balance of compact SMA footprint, guaranteed Class 3 ESD robustness, and precise 5.0 V VRWM alignment with standard 5 V logic rails-making it preferred for space-constrained, high-reliability embedded systems.
Availability
1SMA5.0AT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, USB power delivery circuits, and DC-DC converter outputs requiring stable component supply and full traceability.
Supply support for 1SMA5.0AT3 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMA5.0AT3 belongs to the SMA-series transient voltage suppressors-a family engineered for high-energy surge clamping in space-constrained SMT layouts, with emphasis on automotive-grade reliability and repeatable parametric performance.
FAQ
What is the maximum clamping voltage of the 1SMA5.0AT3 under surge conditions?
The 1SMA5.0AT3 has a maximum clamping voltage (VC) of 9.2 V when subjected to its rated peak pulse current of 43.5 A, measured using the 10/1000 µs waveform per IEC 61000-4-5. This value is guaranteed across temperature and lifetime, ensuring protected ICs remain within safe operating limits during transients.
Is the 1SMA5.0AT3 compatible with lead-free reflow soldering processes?
Yes, the 1SMA5.0AT3 supports lead-free reflow soldering with a maximum peak temperature of 260°C for 10 seconds, as specified in its mechanical characteristics. The Pb-free variant 1SMA5.0AT3G is also available and fully compliant with JEDEC J-STD-020 moisture sensitivity level 1 (MSL1).
How does the 1SMA5.0AT3 differ from bidirectional TVS diodes like the 1SMA5.0CAT3?
The 1SMA5.0AT3 is unidirectional and designed for DC line protection where polarity is fixed (e.g., +5 V rail to ground), offering lower leakage and sharper knee characteristics. In contrast, the 1SMA5.0CAT3 is bidirectional and suited for AC signal lines or differential buses where voltage swings occur in both directions.
What is the thermal resistance of the 1SMA5.0AT3 on a standard FR-4 PCB?
On an FR-4 board using ON Semiconductor's recommended minimum footprint (per CASE 403D-02 outline), the 1SMA5.0AT3 has a junction-to-ambient thermal resistance (RJA) of 250°C/W at TA = 25°C. Derating begins above 25°C at 4.0 mW/°C, reducing usable power dissipation linearly.
Can the 1SMA5.0AT3 be used for protecting a 3.3 V logic rail?
No-the 1SMA5.0AT3 has a 5.0 V working peak reverse voltage (VRWM) and minimum breakdown voltage of 6.4 V, making it unsuitable for direct protection of 3.3 V rails. Using it would risk premature conduction or insufficient clamping margin; instead, select a part with VRWM ≤ 3.3 V (e.g., 1SMA3.3AT3) to ensure proper operation.
1SMA5.0AT3 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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 2035pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA5.0AT3 FAQ
1.How can I place an order for 1SMA5.0AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5.0AT3 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 1SMA5.0AT3 reliable?
The price and inventory of 1SMA5.0AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5.0AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA5.0AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5.0AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5.0AT3?
1SMA5.0AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5.0AT3 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 1SMA5.0AT3?
For technical support, including 1SMA5.0AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5.0AT3 requirements.
6.How does Aetrix verify that 1SMA5.0AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA5.0AT3 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 1SMA5.0AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA5.0AT3?
All 1SMA5.0AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5.0AT3, 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 1SMA5.0AT3 part is unused and in its original packaging.
Return procedure for 1SMA5.0AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA5.0AT3 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
