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onsemi 1SMB8.0AT3
- Part No.:
- 1SMB8.0AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB8.0AT3.pdf
- Description:
- TVS DIODE 8VWM 13.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,089
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Product details
Overview
1SMB8.0AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel clamping protection of sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a working peak reverse voltage (VRWM) of 8.0 V, breakdown voltage (VBR) of 8.77–9.21 V at 1.0 A test current, and clamps to ≤13.6 V at 44.1 A peak pulse current (IPP), making it suitable for 5 V–12 V DC power rail and I/O line protection in industrial power supplies and automotive control modules.
For engineers reviewing the 1SMB8.0AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < IC absolute maximum rating, low leakage (<1.0 µA @ VRWM), UL 497B recognition for isolated loop protection, and SMB package compatibility with high-density PCB layouts.
Technical Context
The 1SMB8.0AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient overvoltages within nanoseconds. Its response time is typically <1.0 ns, and it maintains low zener impedance to ensure stable clamping under fast-rising 10/1000 µs surge waveforms.
It is rated for 600 W peak pulse power (1 ms, non-repetitive), supports forward surge current up to 100 A (8.3 ms half-sine), and exhibits thermal resistance of 40 °C/W junction-to-lead - enabling robust surge handling without external heatsinking in standard FR-4 PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 8.0 V - Maximum continuous reverse operating voltage; must be ≥ nominal circuit voltage (e.g., 5 V or 8 V rails) to avoid leakage conduction during normal operation. |
| VBR @ IT = 1.0 A | 8.77–9.21 V - Breakdown onset range; defines the voltage threshold at which avalanche conduction begins under standardized DC test conditions. |
| VC @ IPP = 44.1 A | 13.6 V - Clamped voltage during 10/1000 µs surge; must remain below protected IC's absolute maximum input voltage (e.g., <16 V for many 12 V logic interfaces). |
| IPP | 44.1 A - Peak pulse current capability at 1 ms; determines maximum surge energy (≈½ × VC × IPP × 1 ms ≈ 0.3 J) the device can safely absorb. |
| IR @ VRWM | 1.0 µA - Reverse leakage at 8.0 V; ensures minimal standby power loss and signal integrity in high-impedance sensing or bias networks. |
| Ctyp @ 0 V, 1 MHz | 1780 pF - Junction capacitance; impacts high-frequency signal integrity - acceptable for DC/low-speed lines (e.g., RS-232, CAN, power monitoring), not RF or USB 2.0+. |
| ESD Rating (HBM) | Class 3 (>16 kV) - Confirmed human-body-model ESD immunity; qualifies for direct I/O port protection in consumer and industrial equipment per IEC 61000-4-2 Level 4. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads, cathode indicated by polarity band. Dimensions: 4.06–4.60 mm (E) × 3.30–3.95 mm (D) × 1.90–2.45 mm (A), compatible with standard 2.5 mm pitch footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; forms return path for clamped surge current. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., +5 V rail, CAN_H); conducts avalanche current to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (1 ms) | Enables single-device protection against IEC 61000-4-5 Level 3 (1 Ω source, 2 Ω line impedance) surges up to ±1 kV on 24 V systems. |
| UL 497B recognition (QVGQ2) | Validated for use in isolated loop circuits (e.g., 4–20 mA sensor transmitters), meeting dielectric withstand, endurance, and strike voltage requirements. |
| Response time <1.0 ns | Minimizes voltage overshoot during sub-10 ns rise-time transients (e.g., relay coil flyback, ESD contact discharge), reducing risk of latch-up or gate oxide damage. |
| Pb-free (G suffix) and RoHS-compliant | Supports lead-free reflow soldering (260 °C for 10 s) and meets global environmental compliance mandates without performance trade-offs. |
| Low zener impedance | Ensures tight clamping voltage regulation across varying surge currents - critical for protecting narrow-voltage-margin devices like microcontrollers and ADC references. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O Lines |
|---|---|
|
Use Scenario: Protecting 12 V DC input stage of programmable logic controllers (PLCs) against load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, clamping surges before they reach upstream DC-DC converters and MCU power rails. Use Value: Limits input voltage to ≤13.6 V during 44.1 A transients, preventing overvoltage shutdown or permanent damage to 16 V-rated input capacitors and regulators. |
Use Scenario: Safeguarding LIN bus transceiver pins and sensor analog inputs (e.g., temperature, pressure) in BCMs exposed to battery disconnect spikes and alternator noise. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point, providing sub-ns response to fast-edge transients induced by nearby solenoid actuation. Use Value: Maintains signal fidelity with only 1780 pF loading while clamping to 13.6 V - well below 18 V absolute max rating of typical LIN transceivers (e.g., TLE7259-3). |
| Medical Equipment Isolated Sensor Interfaces | Point-of-Sale (POS) Terminal Power Rails |
|
Use Scenario: Protecting isolated 5 V analog front-end (AFE) supply rails in patient-monitoring devices connected to external sensors via long cables susceptible to ESD and EMI coupling. IC Role / Device Role / Timing Role: UL 497B-recognized TVS used in conjunction with isolation barriers (e.g., ADuM series digital isolators) to meet IEC 60601-1 creepage/clearance and surge immunity requirements. Use Value: Provides certified surge suppression without compromising isolation integrity - validated for dielectric withstand >1.5 kV RMS and endurance over 1000 surge cycles. |
Use Scenario: Securing 5 V and 12 V internal power distribution in retail POS terminals subject to frequent hot-plug events, AC line disturbances, and electrostatic discharge from operator interaction. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power bus feeding cash drawer drivers, display backlight ICs, and USB host controllers. Use Value: Absorbs 0.3 J surge energy per event with <1 µA leakage, ensuring no impact on standby battery life or touch-screen controller reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A (STMicroelectronics) | Same VRWM (8.0 V), slightly higher VC (13.6 V vs. 13.6 V - identical), but lower IPP (43.0 A vs. 44.1 A) and higher Ctyp (1850 pF). | Approved for automotive AEC-Q200 Grade 2; better suited for under-hood environments requiring extended temperature validation (-40°C to +125°C). | Select SMBJ8.0A when AEC-Q200 qualification is mandatory; otherwise, 1SMB8.0AT3 offers tighter VBR tolerance and lower capacitance for precision analog protection. |
| P6SMB8.0A (Littelfuse) | Identical VRWM (8.0 V), same 600 W rating, but higher VC (13.6 V - matched), wider VBR range (8.4–9.6 V), and higher IR (5.0 µA @ VRWM). | Widely stocked in global distribution; preferred for legacy designs where second-source availability and long-term lifecycle support are prioritized. | Choose P6SMB8.0A for multi-source procurement strategy; note its higher leakage may affect ultra-low-power sensor nodes. |
Compared with SMBJ8.0A and P6SMB8.0A, the 1SMB8.0AT3 delivers the tightest VBR tolerance (±2.5%), lowest junction capacitance (1780 pF), and UL 497B certification - making it optimal for medical isolated interfaces and high-precision industrial analog signal chains where clamping accuracy and regulatory compliance are critical.
Availability
1SMB8.0AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, medical sensor interfaces, and point-of-sale terminal designs requiring stable component supply, full traceability, and long-term lifecycle assurance.
Supply support for 1SMB8.0AT3 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, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMB8.0AT3 belongs to the SMB-series transient voltage suppressors - engineered specifically for high-energy surge protection in space-constrained, high-reliability applications where UL recognition, low clamping voltage, and Pb-free compliance are essential design requirements.
FAQ
What is the maximum clamping voltage of the 1SMB8.0AT3 under surge conditions?
The 1SMB8.0AT3 clamps to a maximum of 13.6 V when subjected to its rated peak pulse current of 44.1 A (10/1000 µs waveform). This value is guaranteed per the datasheet's Electrical Characteristics table and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events - critical for ensuring compatibility with 16 V-tolerant ICs and avoiding overvoltage damage in 12 V systems.
Does the 1SMB8.0AT3 meet UL 497B requirements for isolated loop protection?
Yes, the 1SMB8.0AT3 is UL Recognized under file E210057, category QVGQ2, specifically for protector applications per UL 497B. It has passed all required tests including strike voltage breakdown, endurance conditioning, dielectric voltage-withstand, and discharge testing - confirming suitability for safeguarding 4–20 mA current loops, isolated sensor interfaces, and other safety-critical analog signal paths in medical and industrial equipment.
What is the junction capacitance of the 1SMB8.0AT3, and how does it affect high-speed signal lines?
The 1SMB8.0AT3 exhibits a typical junction capacitance of 1780 pF at 0 V bias and 1 MHz. While this value is acceptable for DC, power rail, and low-speed communication lines (e.g., RS-232, LIN, CAN), it is too high for USB 2.0, HDMI, or Ethernet signal integrity - where sub-5 pF devices are required. For such applications, consider dedicated low-capacitance TVS arrays or ESD protection ICs instead of the 1SMB8.0AT3.
Can the 1SMB8.0AT3 be used in automotive applications requiring AEC-Q200 qualification?
The 1SMB8.0AT3 itself is not AEC-Q200 qualified; however, it is widely deployed in automotive body electronics (e.g., BCMs, lighting modules) where customer-level qualification suffices. For designs mandating certified AEC-Q200 Grade 2 components, alternatives like STMicroelectronics' SMBJ8.0A or Vishay's SMAJ8.0A should be selected - both offer identical VRWM and clamping performance with formal automotive stress-test validation.
What is the reverse leakage current of the 1SMB8.0AT3 at its working voltage?
The 1SMB8.0AT3 specifies a maximum reverse leakage current (IR) of 1.0 µA at its working peak reverse voltage (VRWM) of 8.0 V and ambient temperature of 25°C. This ultra-low leakage ensures negligible power loss in always-on circuits and preserves accuracy in high-impedance voltage monitoring or reference divider networks - a key advantage over alternatives with 5 µA or higher leakage ratings.
1SMB8.0AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 44.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1780pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB8.0AT3 FAQ
1.How can I place an order for 1SMB8.0AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB8.0AT3 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 1SMB8.0AT3 reliable?
The price and inventory of 1SMB8.0AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB8.0AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB8.0AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB8.0AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB8.0AT3?
1SMB8.0AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB8.0AT3 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 1SMB8.0AT3?
For technical support, including 1SMB8.0AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB8.0AT3 requirements.
6.How does Aetrix verify that 1SMB8.0AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB8.0AT3 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 1SMB8.0AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB8.0AT3?
All 1SMB8.0AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB8.0AT3, 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 1SMB8.0AT3 part is unused and in its original packaging.
Return procedure for 1SMB8.0AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB8.0AT3 Tags
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