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onsemi 1SMB16AT3G
- Part No.:
- 1SMB16AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB16AT3G.pdf
- Description:
- TVS DIODE 16VWM 26VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:265,000
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Product details
Overview
1SMB16AT3G from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of sensitive electronics. It features a 16 V working peak reverse voltage (VRWM), 19.7 V minimum breakdown voltage (VBR) at 1.0 mA test current, and clamps to ≤26.0 V at 23.1 A peak pulse current (IPP), making it suitable for automotive power line surge suppression and industrial I/O port protection.
For engineers reviewing the 1SMB16AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, peak pulse current handling under 1 ms 10/1000 µs transients, UL 497B recognition for isolated loop protection, and SMB package thermal performance in high-reliability PCB layouts.
Technical Context
The 1SMB16AT3G operates as a Zener-based avalanche diode with fast response time (<1.0 ns) and low dynamic impedance, enabling effective clamping of ESD and lightning-induced surges before downstream components experience overstress. Its unidirectional configuration provides asymmetric protection-blocking reverse conduction above VRWM while allowing forward conduction below VF ≈ 3.5 V.
Thermal design relies on junction-to-lead resistance (RJL = 25 °C/W) and maximum junction temperature (TJ = +150 °C), with derating required above 75 °C ambient. The device meets AEC-Q101 qualification and supports Pb-free reflow soldering at 260 °C for 10 seconds per JEDEC J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 16 V - Maximum continuous reverse operating voltage; must exceed circuit's DC or peak AC rail voltage to avoid leakage-induced power loss. |
| VBR (min) | 19.7 V @ IT = 1.0 mA - Ensures reliable avalanche initiation above normal operating conditions without premature conduction. |
| VC @ IPP | 26.0 V @ 23.1 A - Clamped voltage during 1 ms 10/1000 µs surge; defines upper bound of protected node voltage during worst-case transient. |
| PPK | 600 W @ 1 ms - Peak surge energy absorption capacity; determines survivability against IEC 61000-4-5 Level 4 (4 kV) surges in properly impedance-matched circuits. |
| IR @ VRWM | 5.0 µA max - Low reverse leakage ensures minimal standby current draw in battery-powered or high-impedance sensing nodes. |
| Ctyp | 965 pF @ 0 V, 1 MHz - Junction capacitance impacts high-frequency signal integrity; acceptable for <10 Mbps data lines but not USB 2.0 or HDMI. |
| Response Time | <1.0 ns - Enables clamping before most microcontroller I/O pins or analog front-ends experience destructive overvoltage. |
Pinout & Package
1SMB16AT3G uses the SMB (Case 403A) surface-mount plastic package: void-free thermosetting body, modified L-bend leads for enhanced pad adhesion, cathode indicated by polarity band, and RoHS-compliant Pb-free finish. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during positive transients when cathode is biased higher. |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 12 V supply or CAN_H); initiates Zener breakdown when reverse voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection-enables use in telecom interface modules requiring safety-agency certified surge suppression. |
| AEC-Q101 Qualified | Validated for automotive underhood applications including engine control units and body electronics exposed to load dump and ISO 7637-2 pulses. |
| ESD Rating >16 kV HBM | Withstands human-body-model ESD events without parameter shift-critical for assembly-line handling and field-replaceable I/O connectors. |
| Low Clamping Ratio (VC/VBR) | 1.32 (26.0 V / 19.7 V)-tight ratio minimizes voltage overshoot margin, allowing smaller design margins for downstream TVS or IC absolute maximum ratings. |
| SURMETIC™ Package | ON Semiconductor's proprietary molded construction delivers superior moisture resistance and thermal cycling reliability vs. standard SMB packages. |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Suppresses load dump transients (ISO 7637-2 Pulse 5a, up to 60 V/100 ms) on 12 V vehicle power distribution networks feeding ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input; clamps within 1 ns to limit voltage seen by LDOs and microcontrollers. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies during alternator disconnection events. |
Use Scenario: Protects 24 V digital input channels in programmable logic controllers from induced surges due to relay coil switching or nearby motor drives. IC Role / Device Role / Timing Role: Parallel-connected TVS across optocoupler input terminals; absorbs 1 kV/500 A 10/1000 µs transients per IEC 61000-4-5. Use Value: Eliminates false triggering and extends optocoupler lifetime in factory automation environments with high EMI noise floor. |
| Medical Equipment Power Entry | Telecom Interface Protection |
Use Scenario: Shields AC/DC adapter secondary-side outputs in Class II medical devices (e.g., patient monitors) from mains-borne surges per IEC 60601-1 Ed. 3.1. IC Role / Device Role / Timing Role: Final-stage TVS on isolated 5 V/12 V rails upstream of critical analog sensors and ADC references. Use Value: Maintains signal integrity and regulatory compliance by limiting transient-induced offset errors in precision measurement circuits. |
Use Scenario: UL 497B-recognized protection for RS-485/RS-232 ports in networked diagnostic equipment connected to building-wide cabling infrastructure. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used with series impedance to meet telecom surge immunity requirements (GR-1089-CORE). Use Value: Enables single-device protection architecture without external diode bridges, reducing BOM count and board space in compact diagnostic modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Same VRWM (16 V) and PPK (400 W), but lower IPP (20.1 A) and higher VC (26.0 V); SMA package (smaller footprint, higher thermal resistance). | Limited to lower-energy transients (IEC 61000-4-5 Level 3); unsuitable for automotive load dump where 600 W rating is mandatory. | Select 1SMB16AT3G when 600 W surge capability and AEC-Q101 qualification are required; choose SMAJ16A only for space-constrained consumer-grade designs. |
| SMCJ16A | Higher PPK (1500 W), same VRWM (16 V), lower VC (25.5 V), larger SMC package (Case 403D); identical AEC-Q101 and UL 497B status. | Overqualified for most 12 V systems; requires larger PCB area and may introduce excessive parasitic inductance in high-speed signal paths. | Prefer 1SMB16AT3G for cost-sensitive, space-optimized 12 V protection; reserve SMCJ16A for harsh environments demanding >1 kA surge tolerance. |
Compared with SMAJ16A, 1SMB16AT3G delivers 50% higher surge energy handling and automotive qualification; compared with SMCJ16A, it offers 40% smaller footprint and optimized thermal performance for dense automotive PCBs without sacrificing clamping performance.
Availability
1SMB16AT3G is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for 1SMB16AT3G 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 part of 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 SMB-series TVS diodes-including 1SMB16AT3G-are engineered for robust transient suppression in high-reliability power and signal interfaces, with emphasis on AEC-Q101 compliance, UL safety recognition, and SURMETIC™ package reliability.
FAQ
What is the maximum clamping voltage of the 1SMB16AT3G under a 23.1 A transient?
The 1SMB16AT3G clamps to a maximum of 26.0 V when subjected to its rated peak pulse current of 23.1 A (10/1000 µs waveform). This value is specified in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet and represents the upper voltage limit imposed on the protected circuit during worst-case surge conditions. Designers must ensure this clamping voltage remains below the absolute maximum rating of downstream components.
Does the 1SMB16AT3G meet automotive qualification standards?
Yes, the 1SMB16AT3G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control, body electronics, and infotainment systems. It has been tested for temperature cycling, humidity bias, mechanical shock, and surge immunity per the AEC-Q101 stress test standard, and is explicitly listed in ON Semiconductor's automotive-grade product portfolio.
What is the junction capacitance of the 1SMB16AT3G and how does it affect high-speed signals?
The 1SMB16AT3G exhibits a typical junction capacitance of 965 pF at 0 V bias and 1 MHz. This relatively high capacitance makes it unsuitable for protecting high-speed serial interfaces such as USB 2.0, HDMI, or PCIe, where sub-5 pF loading is required. However, it is appropriate for DC power rails, low-speed digital I/O (≤1 Mbps), and analog sensor inputs where bandwidth constraints are less stringent.
Can the 1SMB16AT3G be used in bidirectional protection configurations?
No, the 1SMB16AT3G is a unidirectional TVS diode and cannot provide symmetrical clamping for both polarities. For bidirectional protection (e.g., RS-485, CAN bus), a dedicated bidirectional device such as 1SMB16CAT3G or a back-to-back diode arrangement is required. Using two 1SMB16AT3G devices in series opposition is not recommended due to mismatched VBR and thermal imbalance risks.
What is the lead-free soldering profile compatible with the 1SMB16AT3G?
The 1SMB16AT3G supports Pb-free reflow soldering per JEDEC J-STD-020, with a maximum peak temperature of 260 °C for 10 seconds. Its SURMETIC™ package is rated for standard industry reflow profiles, including ramp rates ≤3 °C/s, preheat (150–200 °C), soak (180–200 °C for 60–120 s), and reflow (peak 235–260 °C). Avoid exceeding 260 °C to prevent internal delamination or bond wire failure.
1SMB16AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 23.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 965pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB16AT3G FAQ
1.How can I place an order for 1SMB16AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB16AT3G 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 1SMB16AT3G reliable?
The price and inventory of 1SMB16AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB16AT3G is usually 5 days.
3.What payment methods are accepted for 1SMB16AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB16AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB16AT3G?
1SMB16AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB16AT3G 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 1SMB16AT3G?
For technical support, including 1SMB16AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB16AT3G requirements.
6.How does Aetrix verify that 1SMB16AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMB16AT3G 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 1SMB16AT3G meets industry standards.
7.What is the process for return or replacement of 1SMB16AT3G?
All 1SMB16AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB16AT3G, 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 1SMB16AT3G part is unused and in its original packaging.
Return procedure for 1SMB16AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB16AT3G Tags
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