My Inquiry
My Account
onsemi 1SMB7.0AT3
- Part No.:
- 1SMB7.0AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMB7.0AT3.pdf
- Description:
- TVS DIODE 7V 12V SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,112
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMB7.0AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of DC power rails and signal lines. It features a 7.0 V working peak reverse voltage (VRWM), 8.19 V minimum breakdown voltage (VBR) at 10 mA, and clamps to ≤12.0 V at 50.0 A peak pulse current (IPP), making it suitable for protecting automotive ECUs, industrial power supplies, and communication interface circuits against ESD and lightning-induced surges.
For engineers reviewing the 1SMB7.0AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 7.0 V VRWM rating, sub-1 ns response time, UL 497B recognition for isolated loop protection, low 500 µA max leakage at VRWM, and SMB package compatibility with high-density SMT layouts.
Technical Context
The 1SMB7.0AT3 operates as a unidirectional Zener-clamp TVS diode, leveraging avalanche breakdown to divert transient energy away from protected circuitry. Its design centers on fast turn-on (<1.0 ns typical), low dynamic impedance during clamping, and robust 600 W surge handling per 10/1000 µs waveform.
It is rated for 150 °C maximum junction temperature, exhibits 2005 pF typical junction capacitance at 0 V bias, and maintains stable clamping performance across −65 °C to +150 °C operating range - critical for under-hood automotive and industrial environments where thermal cycling and long-term reliability are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.0 V - Maximum continuous reverse operating voltage before clamping begins; must be ≥ circuit's DC or peak AC rail voltage. |
| VBR (min) | 7.78 V @ IT = 10 mA - Minimum Zener breakdown threshold; ensures reliable conduction onset during transients. |
| VC @ IPP | 12.0 V @ 50.0 A - Clamped voltage during 600 W surge; defines worst-case overvoltage seen by protected ICs. |
| PPK | 600 W @ 1 ms - Peak transient power dissipation capability; validates suitability for IEC 61000-4-5 Level 3/4 surges. |
| IR @ VRWM | 500 µA - Reverse leakage at rated working voltage; low enough to avoid loading sensitive 5–12 V logic or sensor rails. |
| Response Time | <1.0 ns - Avalanche turn-on speed; enables suppression before downstream CMOS or MCU inputs are damaged. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed human-body-model ESD robustness for board-level handling and end-user environments. |
Pinout & Package
1SMB7.0AT3 is housed in an SMB (DO-214AA) surface-mount plastic package (Case 403A), featuring a cathode band marking and modified L-bend leads for enhanced solder joint reliability. The package measures 4.32 mm × 2.13 mm × 2.26 mm and supports reflow soldering at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path | Connected to ground or low-impedance return; carries full surge current during clamping events. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 5–12 V rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - meets safety requirements for telecom and industrial fieldbus interfaces. |
| Pb-Free (G suffix) | RoHS-compliant Surmetic™ package - eliminates lead content without sacrificing thermal or mechanical reliability. |
| Low Clamping Ratio | VC/VBR ≈ 1.54 - tight ratio between clamp and breakdown voltages minimizes overvoltage stress on downstream components. |
| High Surge Robustness | Withstands 100 A non-repetitive forward surge (IFSM) - supports placement near input connectors subject to repetitive load dump or inductive kick. |
| Thermal Stability | RJA = 226 °C/W - enables operation up to +150 °C junction temperature with appropriate PCB copper area. |
Applications
| Automotive Power Rail Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and jump-start transients. IC Role / Device Role: Unidirectional shunt TVS placed between VCC and GND, clamping surges before they reach LDO regulators or MCU VDD pins. Use Value: Limits transient voltage to ≤12.0 V at 50 A, preventing latch-up or permanent damage to 5 V tolerant peripherals under ISO 7637-2 Pulse 5a conditions. |
Use Scenario: Safeguarding RS-485 transceiver data lines (A/B) in factory automation PLCs exposed to cable ESD and ground-loop surges. IC Role / Device Role: Paired unidirectional TVS devices (one per line) referenced to local ground, suppressing common-mode transients up to ±15 kV contact discharge. Use Value: Sub-1 ns response and 2005 pF capacitance ensure signal integrity is preserved at 250 kbps while meeting IEC 61000-4-2 Level 4 immunity. |
| Medical Equipment Power Input | Point-of-Sale Terminal USB Port |
|
Use Scenario: Shielding auxiliary 5 V/12 V power entry points in diagnostic imaging subsystems from AC mains coupling and EFT bursts. IC Role / Device Role: Primary overvoltage clamp on secondary-side DC rails, coordinated with upstream fuses and MOVs for staged protection. Use Value: UL 497B recognition confirms compliance with medical isolation barrier requirements, enabling use in Class I and II equipment without additional certification effort. |
Use Scenario: Adding surge resilience to USB VBUS lines in retail kiosks subjected to frequent hot-plug events and accidental 24 V misconnection. IC Role / Device Role: Standalone unidirectional TVS on VBUS, sized to absorb 600 W surges while maintaining <500 µA leakage to preserve USB suspend current budgets. Use Value: 7.0 V VRWM allows safe operation with 5 V nominal VBUS, while 12.0 V clamping prevents damage to USB controller PHYs rated for 6 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.0A | Same SMB package, identical VRWM (7.0 V) and VC (12.0 V), but rated for 600 W with tighter VBR tolerance (7.78–8.6 V vs. 7.78–8.19 V). | Higher production volume and broader distributor availability; preferred for new designs requiring second-source assurance. | Select SMBJ7.0A when extended VBR range is acceptable and supply chain diversification is prioritized over minimal clamping voltage variation. |
| 1.5SMC7.0A | Larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), same electrical specs but higher thermal mass and RJA = 125 °C/W. | Better suited for high-ambient-temperature environments (>85 °C) or where board space permits larger footprints for improved long-term reliability. | Choose 1.5SMC7.0A only if thermal derating margins are insufficient with SMB layout, or if legacy SMC footprint reuse is required. |
Compared with SMBJ7.0A and 1.5SMC7.0A, the 1SMB7.0AT3 offers the smallest PCB footprint among 7 V 600 W TVS diodes while maintaining identical clamping performance and UL 497B recognition - ideal for space-constrained automotive and portable industrial modules.
Availability
1SMB7.0AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial communications, and medical power supply designs requiring stable component supply, RoHS compliance, and UL-recognized surge protection.
Supply support for 1SMB7.0AT3 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, cloud, and consumer markets.
The 1SMB7.0AT3 belongs to the SMB series of unidirectional TVS diodes engineered specifically for high-energy transient suppression in harsh environments - emphasizing fast response, low clamping, and regulatory compliance for mission-critical systems.
FAQ
What is the maximum clamping voltage of the 1SMB7.0AT3 under surge conditions?
The 1SMB7.0AT3 clamps to a maximum of 12.0 V at its rated peak pulse current of 50.0 A (10/1000 µs waveform). This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during a 600 W transient event. Designers must verify that downstream components tolerate this clamped voltage under worst-case surge conditions.
Is the 1SMB7.0AT3 compatible with lead-free reflow soldering processes?
Yes, the 1SMB7.0AT3 is offered in a Pb-free Surmetic™ package (indicated by the "G" suffix), qualified for standard lead-free reflow profiles with peak temperatures up to 260 °C for 10 seconds. Its modified L-bend leads and void-free thermosetting plastic body ensure reliable wetting and mechanical integrity during automated assembly.
Does the 1SMB7.0AT3 meet any safety certifications for circuit protection?
Yes, the 1SMB7.0AT3 carries UL 497B recognition (File #E210057) for isolated loop circuit protection. This certification validates its performance in surge endurance, dielectric withstand, and strike voltage breakdown tests - confirming suitability for telecom, industrial fieldbus, and medical equipment where safety agency approval is mandatory.
How does the 1SMB7.0AT3 differ from bidirectional TVS diodes like the 1SMB7.0AT3-BI?
The 1SMB7.0AT3 is unidirectional and intended for DC rail protection where polarity is fixed (e.g., VCC-to-GND). Bidirectional variants such as 1SMB7.0AT3-BI are used for AC or differential signal lines (e.g., RS-485, USB D+/D−) and clamp symmetrically in both directions. The 1SMB7.0AT3 cannot replace bidirectional types in AC-coupled applications due to its single-polarity avalanche behavior.
What is the junction capacitance of the 1SMB7.0AT3, and how does it affect high-speed signal lines?
The 1SMB7.0AT3 exhibits 2005 pF typical junction capacitance at 0 V bias and 1 MHz. While acceptable for DC power rails and low-speed interfaces (e.g., CAN, RS-232), this capacitance may distort edges or attenuate signals above ~1 Mbps. For high-speed data lines, lower-capacitance TVS devices (e.g., <100 pF) should be selected instead of the 1SMB7.0AT3.
1SMB7.0AT3 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:
- -
1SMB7.0AT3 FAQ
1.How can I place an order for 1SMB7.0AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB7.0AT3 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 1SMB7.0AT3 reliable?
The price and inventory of 1SMB7.0AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB7.0AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB7.0AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB7.0AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB7.0AT3?
1SMB7.0AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB7.0AT3 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 1SMB7.0AT3?
For technical support, including 1SMB7.0AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB7.0AT3 requirements.
6.How does Aetrix verify that 1SMB7.0AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB7.0AT3 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 1SMB7.0AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB7.0AT3?
All 1SMB7.0AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB7.0AT3, 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 1SMB7.0AT3 part is unused and in its original packaging.
Return procedure for 1SMB7.0AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB7.0AT3 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…
