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onsemi 1SMB9.0AT3
- Part No.:
- 1SMB9.0AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB9.0AT3.pdf
- Description:
- TVS DIODE 9VWM 15.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,769
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Product details
Overview
1SMB9.0AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel clamping protection of sensitive electronics. It features a 9.0 V working peak reverse voltage (VRWM), 15.4 V maximum clamping voltage at 39.0 A peak pulse current, and sub-1 ns response time - enabling robust surge suppression in DC power rails and low-voltage signal lines.
For engineers reviewing the 1SMB9.0AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM matching system operating voltage, clamping voltage margin relative to device absolute maximum ratings, UL 497B certification for isolated loop protection, and SMB package thermal performance under repetitive surge conditions.
Technical Context
The 1SMB9.0AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above its 10.55 V nominal breakdown voltage (VBR @ 1.0 mA). Its low zener impedance and fast <1.0 ns response ensure minimal overshoot during ESD or lightning-induced surges.
It is rated for 600 W peak pulse power (10/1000 µs waveform), 100 A non-repetitive forward surge current, and exhibits only 1.0 µA max reverse leakage at VRWM - making it suitable for low-power, high-reliability protection where standby current and voltage margin are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 9.0 V - Working peak reverse voltage; must be ≥ circuit's continuous DC or peak AC operating voltage to avoid leakage or conduction during normal operation. |
| VBR (min/typ/max) | 9.21 V / 9.83 V / 10.55 V @ 1.0 mA - Zener breakdown threshold; defines onset of clamping and sets minimum overvoltage immunity level. |
| VC @ IPP | 15.4 V @ 39.0 A - Maximum clamped voltage during 600 W transient; determines worst-case stress on downstream components. |
| PPK | 600 W @ 1 ms - Peak pulse power handling; validates capability against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges when properly mounted. |
| IR @ VRWM | 1.0 µA - Reverse leakage at 9.0 V; ensures negligible standby current draw in battery-powered or low-quiescent systems. |
| Response Time | <1.0 ns - Time to enter avalanche conduction; limits voltage overshoot before clamping engages, critical for protecting fast logic or analog inputs. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection; validates compliance with safety standards for telecom, industrial control, and medical isolation barriers. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads and cathode polarity band. Mounting position is unrestricted; maximum soldering temperature is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; forms return path for surge current during clamping. |
| Cathode | High-side protected node terminal | Connected to line being protected (e.g., +9 V rail); reverse-biased during normal operation; conducts avalanche current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 4 kV (2 Ω source) on 9 V DC lines without derating, given proper PCB layout and trace inductance control. |
| UL 497B recognition | Validates suitability for safety-critical isolated loop protection in telecom interfaces, process controllers, and medical equipment per Underwriters Laboratories requirements. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 (±8 kV contact / ±15 kV air) without external series impedance, simplifying board-level ESD design for front-panel connectors. |
| Low clamping ratio (VC/VBR ≈ 1.57) | Minimizes voltage overshoot margin - e.g., clamps 9 V rail transients to ≤15.4 V, preserving headroom for 16 V-rated ICs or regulators downstream. |
| Pb-free (G suffix) option | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) 1, enabling lead-free reflow assembly without reliability compromise. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting 9–12 V DC input stage of DIN-rail mounted PLC power supplies against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, clamping transients before they reach input filter capacitors and primary-side controller ICs. Use Value: Limits input rail overshoot to ≤15.4 V during 12 V system load dump (up to 60 V/100 ms), preventing damage to 20 V-rated MOSFETs and bulk capacitors. |
Use Scenario: Safeguarding CAN_H and CAN_L lines in BCM modules exposed to battery transients and ESD during service disconnect/reconnect. IC Role / Device Role / Timing Role: One 1SMB9.0AT3 per line (CAN_H–GND, CAN_L–GND), providing low-leakage, fast-response clamping without distorting 1 Mbps differential signaling. Use Value: Maintains CAN bus integrity by clamping common-mode spikes to ≤15.4 V while adding only 1605 pF capacitance - well below 100 pF limit for high-speed CAN FD. |
| Medical Equipment Isolated Sensor Interface | Point-of-Sale (POS) Terminal USB Power Rail Protection |
|
Use Scenario: Protecting 9 V isolated analog front-end (AFE) supply feeding precision ADCs in patient monitoring devices with reinforced isolation barriers. IC Role / Device Role / Timing Role: TVS on secondary-side 9 V rail, referenced to isolated ground, certified to UL 497B for creepage/clearance compliance in Class II medical designs. Use Value: Enables UL-certified surge protection without compromising isolation barrier integrity - validated for 2500 VAC dielectric withstand and strike voltage breakdown per UL 497B Annex A. |
Use Scenario: Securing 5 V/9 V USB-C PD input rails in retail POS terminals subject to frequent hot-plug ESD and cable-induced transients. IC Role / Device Role / Timing Role: Primary clamping device on VBUS line, placed immediately after connector, with series fuse and optional common-mode choke. Use Value: Absorbs >16 kV HBM ESD strikes and 30 A 8/20 µs surges while maintaining <1 µA leakage - ensuring no impact on USB enumeration or PD negotiation timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A | Same VRWM (9.0 V) and VC (15.4 V), but rated for 600 W with tighter VBR tolerance (9.0–10.0 V vs. 9.21–10.55 V) and higher IR (5.0 µA max). | Preferred in automotive ECUs requiring AEC-Q200 qualification; lacks UL 497B recognition. | Select SMBJ9.0A when AEC-Q200 compliance is mandatory and UL certification is not required. |
| 1.5SMC9.0A | Higher PPK (1500 W), larger SMC package (7.1 × 6.2 mm), 15.4 V VC same, but 10× higher IR (10 µA) and slower response (~1.5 ns). | Suitable for high-energy industrial motor drives; incompatible with space-constrained SMB footprints. | Choose 1.5SMC9.0A only when surge energy exceeds 600 W capability and PCB area permits SMC mounting. |
Compared with SMBJ9.0A, the 1SMB9.0AT3 offers UL 497B certification for isolated loop use but looser VBR tolerance; versus 1.5SMC9.0A, it provides identical clamping performance in half the footprint and lower leakage, at the cost of reduced single-pulse energy handling.
Availability
1SMB9.0AT3 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, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1SMB9.0AT3 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 medical markets.
The 1SMB9.0AT3 belongs to the SMB series of transient voltage suppressors, engineered specifically for cost-sensitive, high-reliability surge protection in communication systems, automotive electronics, and industrial controls - emphasizing low clamping voltage, fast response, and regulatory certifications.
FAQ
What is the maximum clamping voltage of the 1SMB9.0AT3 under surge conditions?
The 1SMB9.0AT3 has a maximum clamping voltage (VC) of 15.4 V at 39.0 A peak pulse current (IPP), measured using the standard 10/1000 µs double-exponential waveform. This value represents the worst-case voltage seen by downstream components during a full 600 W transient event and is critical for verifying margin against IC absolute maximum ratings.
Does the 1SMB9.0AT3 meet UL safety standards for isolated circuits?
Yes, the 1SMB9.0AT3 carries UL 497B recognition (File #E210057, category QVGQ2) for isolated loop circuit protection. This certification confirms successful testing for strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - making it suitable for medical and industrial isolation barrier applications where regulatory compliance is mandatory.
Can the 1SMB9.0AT3 be used in bidirectional signal line protection?
No, the 1SMB9.0AT3 is a unidirectional TVS diode and must be connected with cathode to the protected line and anode to ground. For bidirectional protection (e.g., RS-485, USB D+/D−), a dedicated bidirectional part such as 1SMB9.0AT3-B or SMBJ9.0CA is required - the 1SMB9.0AT3 will conduct continuously if reverse-biased beyond its 9.0 V VRWM.
What is the thermal resistance from junction-to-lead (RJL) for the 1SMB9.0AT3?
The 1SMB9.0AT3 has a thermal resistance from junction-to-lead (RJL) of 40 °C/W, measured with zero lead length on a 1 in² copper pad (FR-4 board). This parameter governs heat dissipation during repetitive surge events and informs layout decisions - such as copper pour area and via count - to maintain junction temperature below 150°C under sustained duty cycles.
Is the 1SMB9.0AT3 compatible with lead-free reflow soldering processes?
Yes, the 1SMB9.0AT3 is available in Pb-free packaging (denoted by the "G" suffix, e.g., 1SMB9.0AT3G) and is qualified for lead-free reflow per JEDEC J-STD-020. Its maximum soldering temperature is rated at 260°C for 10 seconds, aligning with standard SAC305 profile peaks and ensuring reliable interconnect formation without delamination or package cracking.
1SMB9.0AT3 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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 39A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1605pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB9.0AT3 FAQ
1.How can I place an order for 1SMB9.0AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB9.0AT3 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 1SMB9.0AT3 reliable?
The price and inventory of 1SMB9.0AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB9.0AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB9.0AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB9.0AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB9.0AT3?
1SMB9.0AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB9.0AT3 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 1SMB9.0AT3?
For technical support, including 1SMB9.0AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB9.0AT3 requirements.
6.How does Aetrix verify that 1SMB9.0AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB9.0AT3 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 1SMB9.0AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB9.0AT3?
All 1SMB9.0AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB9.0AT3, 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 1SMB9.0AT3 part is unused and in its original packaging.
Return procedure for 1SMB9.0AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB9.0AT3 Tags
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D12V0L1B2LP-7B
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