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onsemi 1SMA7.5AT3
- Part No.:
- 1SMA7.5AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMA7.5AT3.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
1SMA7.5AT3 from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) in SMA package, with 7.5 V working peak reverse voltage (VRWM), 12.9 V clamping voltage (VC) at 31.0 A peak pulse current (IPP), and <1 ns response time. It protects sensitive electronics in power supplies and industrial control systems against ESD and lightning-induced surges.
For engineers reviewing the 1SMA7.5AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to IC absolute maximum ratings, IPP capability under IEC 61000-4-5 waveforms, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The 1SMA7.5AT3 operates as a unidirectional clamping device, conducting only during negative transients relative to its anode–cathode polarity. Its Zener-based avalanche structure delivers low dynamic impedance and stable breakdown at 8.33–9.21 V (VBR @ IT = 1 mA), enabling precise overvoltage thresholding.
Designed for surface-mount PCB integration in the SMA (Case 403D) package, it supports top-slide or bottom-board mounting with flat handling surface and cathode band marking. Thermal resistance is 250 °C/W junction-to-ambient (RJA) and 50 °C/W junction-to-lead (RJL), requiring appropriate copper pad area per ON Semi's recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC bus or signal rail voltage. |
| VBR min/max | 8.33 V / 9.21 V @ 1 mA - Confirmed Zener breakdown range ensures predictable turn-on across temperature and unit variation. |
| VC @ IPP | 12.9 V @ 31.0 A - Clamped voltage during 10/1000 µs surge; defines maximum stress imposed on downstream ICs. |
| PPK | 400 W @ 1 ms - Peak surge power handling per non-repetitive 10×1000 µs waveform per R.E.A. standard. |
| IR @ VRWM | 50 µA - Low leakage at rated reverse voltage preserves efficiency in high-impedance bias networks. |
| Response time | <1 ns - Enables suppression of fast-rising ESD events (IEC 61000-4-2) before damage occurs. |
| ESD rating | Class 3 (>16 kV HBM) - Validated robustness against human-body-model electrostatic discharge. |
| Package | SMA (Case 403D) - Standardized surface-mount outline with cathode band polarity marking and Pb-free finish (G suffix). |
Pinout & Package
SMA package (Case 403D), surface-mount, low-profile plastic housing with void-free transfer-molded construction. Cathode indicated by molded polarity band; anode is unmarked terminal. Mounting position unrestricted; compatible with reflow and wave soldering (260 °C for 10 s max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection to protected line | Reverse-biased node where clamping occurs; connects to voltage rail or signal line needing protection. |
| Anode | Reference/ground return path | Low-impedance path to system ground or common reference; must minimize inductance for effective surge shunting. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Handles IEC 61000-4-5 combination wave surges up to 400 W without degradation, supporting industrial-grade immunity. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics where reliability under thermal cycling is critical. |
| Low clamping ratio (VC/VBR ≈ 1.55) | Minimizes overvoltage overshoot during transients, reducing risk of latch-up or gate oxide rupture in protected ICs. |
| Pb-free (G suffix) and RoHS compliant | Meets global environmental regulations and enables compatibility with lead-free assembly processes without derating. |
| Flat handling surface | Ensures consistent pick-and-place accuracy during automated SMT assembly, reducing placement misalignment and tombstoning. |
Applications
| Industrial Power Supplies | Automotive ECUs |
|---|---|
Use Scenario: Input stage of 12 V DC-DC converter subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to limit voltage excursions. Use Value: Clamps 12 V rail to ≤12.9 V during 31 A surge, preventing damage to upstream rectifiers and downstream regulators. | Use Scenario: CAN transceiver interface exposed to ISO 7637-2 pulse 5a/b surges in vehicle body control module. IC Role / Device Role / Timing Role: Primary overvoltage protection on VCC supply line feeding CAN PHY and microcontroller. Use Value: Withstands >16 kV HBM ESD and suppresses 10/1000 µs pulses while maintaining AEC-Q101 compliance for automotive deployment. |
| Medical Equipment Interfaces | Communication System Surge Ports |
Use Scenario: Front-panel USB or RS-232 port on diagnostic imaging device requiring IEC 60601-1-2 ESD immunity. IC Role / Device Role / Timing Role: Secondary-level transient suppressor after primary gas discharge tube (GDT) in multi-stage protection scheme. Use Value: Provides sub-nanosecond response to fast ESD events, limiting voltage seen by USB PHY to safe levels below 13 V. | Use Scenario: Ethernet PoE injector output port subject to lightning-induced surges on data lines and power pairs. IC Role / Device Role / Timing Role: Line-side TVS on 48 V DC power feed, coordinated with common-mode chokes and data-line protectors. Use Value: Delivers 400 W peak power dissipation and 7.5 V VRWM matching PoE Class 3/4 nominal voltage, ensuring no false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA7.5AT3G | Same electrical specs and package; "SZ" prefix denotes automotive-specific traceability and PPAP support. | Required for Tier 1 automotive programs mandating unique site controls and change management. | Select SZ1SMA7.5AT3G when full PPAP documentation and AEC-Q101 automotive audit trail are contractually required. |
| 1.5SMC7.5A | Higher 1500 W peak power rating, DO-214AB (SMC) package, 13.4 V clamping at 112 A IPP. | Suitable for higher-energy surge environments (e.g., AC mains input, outdoor telecom), but larger footprint and higher VC. | Choose 1.5SMC7.5A only if 400 W is insufficient and board space allows SMC package; not drop-in compatible with SMA layout. |
Compared with SZ1SMA7.5AT3G, the 1SMA7.5AT3 offers identical protection performance but lacks automotive-specific change control; versus 1.5SMC7.5A, it trades lower surge capacity for compact SMA footprint and tighter clamping voltage-critical for space-constrained, low-voltage logic rail protection.
Availability
1SMA7.5AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, medical equipment interfaces, and communication system surge ports requiring stable component supply and long-term lifecycle support.
Supply support for 1SMA7.5AT3 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, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMA7.5AT3 belongs to the SMA-series unidirectional TVS family, engineered for high-surge, low-clamping protection of DC power rails and signal lines in harsh electromagnetic environments.
FAQ
What is the clamping voltage of the 1SMA7.5AT3 under maximum surge conditions?
The 1SMA7.5AT3 exhibits a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPP) of 31.0 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across temperature and unit variation per ON Semiconductor's datasheet specifications and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the 1SMA7.5AT3 suitable for automotive applications?
Yes, the 1SMA7.5AT3 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control units, body electronics, and infotainment power rails. Its robust surge handling, low leakage, and thermal stability under −65 °C to +150 °C operating range meet stringent automotive reliability requirements-though SZ1SMA7.5AT3G is preferred when full automotive traceability and change control are mandated.
How does the 1SMA7.5AT3 differ from bidirectional TVS diodes?
The 1SMA7.5AT3 is unidirectional and functions only as a reverse-biased Zener clamp-conducting during negative transients relative to its anode–cathode orientation. Bidirectional variants (e.g., 1SMA7.5CAT3) provide symmetrical clamping for AC signals or differential lines. Using 1SMA7.5AT3 on AC paths risks forward conduction and failure; always verify polarity alignment in DC protection schemes.
What is the maximum reverse leakage current for the 1SMA7.5AT3 at its rated VRWM?
At its working peak reverse voltage (VRWM) of 7.5 V and ambient temperature of 25 °C, the 1SMA7.5AT3 guarantees a maximum reverse leakage current (IR) of 50 µA. This low leakage preserves efficiency in high-impedance circuits and ensures minimal standby power loss-critical for battery-powered or precision reference applications where parasitic current draw must be tightly controlled.
Can the 1SMA7.5AT3 be used in place of the 1SMA6.8AT3?
No-the 1SMA7.5AT3 has a higher VRWM (7.5 V vs. 6.8 V) and different breakdown range (8.33–9.21 V vs. 7.56–7.98 V), meaning it will not begin clamping until a higher voltage threshold is reached. Substituting it for 1SMA6.8AT3 may leave downstream components unprotected during transients just above 6.8 V; always match VRWM to the protected circuit's maximum continuous operating voltage.
1SMA7.5AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
1SMA7.5AT3 FAQ
1.How can I place an order for 1SMA7.5AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA7.5AT3 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 1SMA7.5AT3 reliable?
The price and inventory of 1SMA7.5AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA7.5AT3 is usually 5 days.
3.What payment methods are accepted for 1SMA7.5AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA7.5AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA7.5AT3?
1SMA7.5AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA7.5AT3 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 1SMA7.5AT3?
For technical support, including 1SMA7.5AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA7.5AT3 requirements.
6.How does Aetrix verify that 1SMA7.5AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMA7.5AT3 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 1SMA7.5AT3 meets industry standards.
7.What is the process for return or replacement of 1SMA7.5AT3?
All 1SMA7.5AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA7.5AT3, 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 1SMA7.5AT3 part is unused and in its original packaging.
Return procedure for 1SMA7.5AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA7.5AT3 Tags
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onsemi
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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