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onsemi 1SMB14AT3G
- Part No.:
- 1SMB14AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB14AT3G.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:13,814
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Product details
Overview
1SMB14AT3G 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 14 V working peak reverse voltage (VRWM), 17.2 V maximum clamping voltage at 25.8 A peak pulse current (VC @ IPP), and <1.0 ns response time. It is widely deployed in automotive powertrain control modules and industrial DC power input stages.
For engineers reviewing the 1SMB14AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current handling under IEC 61000-4-5 10/1000 µs waveform, UL 497B certification for isolated loop protection, and SMB package thermal performance under sustained surge duty cycles.
Technical Context
The 1SMB14AT3G operates as a voltage-clamped shunt protector: when reverse voltage exceeds its 15.6–17.2 V breakdown range (VBR @ IT = 1.0 mA), it rapidly transitions from high-impedance to low-impedance state, diverting surge current away from downstream circuitry. Its silicon Zener junction enables precise, repeatable clamping with low dynamic impedance.
It is rated for 600 W non-repetitive peak power (10/1000 µs waveform), supports 100 A forward surge current (8.3 ms half-sine), and maintains <5.0 µA leakage at VRWM. Thermal design relies on junction-to-lead resistance (RJL = 25 °C/W) and FR-4 board mounting with minimum recommended footprint per CASE 403A outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 14 V - Maximum continuous reverse voltage before clamping begins; sets minimum system operating margin. |
| Breakdown Voltage (VBR) | 15.6–17.2 V @ 1.0 mA - Confirmed Zener conduction threshold; defines turn-on precision. |
| Clamping Voltage (VC) | 23.2 V @ 25.8 A - Maximum voltage seen by protected circuit during full-rated surge; critical for IC survival. |
| Peak Pulse Power (PPK) | 600 W @ 1 ms - Surge energy absorption capacity under standard IEC 61000-4-5 test condition. |
| Junction Capacitance (Ctyp) | 1085 pF @ 0 V - Signal integrity impact on high-speed lines; requires layout mitigation above ~1 MHz. |
| ESD Rating | Class 3 (>16 kV HBM) - Robustness against human-body model electrostatic discharge events. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Validated for isolated loop circuit protection in telecom and industrial safety-critical systems. |
Pinout & Package
Package: SMB (CASE 403A), surface-mount, Pb-free, void-free thermosetting plastic with modified L-bend leads and cathode polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during clamping | Connected to system ground or low-impedance return path; must handle full IPP surge current without trace heating. |
| Cathode | Protected line connection | Connected to line being protected (e.g., 12 V rail); polarity band identifies this terminal; reverse-biased during operation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV line-to-earth) surges without degradation. |
| Clamping voltage ≤23.2 V at 25.8 A | Provides ≥2.8 V margin below typical 24 V system overvoltage trip thresholds, preventing false triggering. |
| Response time <1.0 ns | Minimizes voltage overshoot before clamping engages, critical for protecting fast-switching MOSFET gates and microcontroller I/O. |
| UL 497B recognition | Validates compliance for use in certified isolated loop interfaces (e.g., RS-485, 4–20 mA transmitters) without additional safety review. |
| AEC-Q101 qualified (SZ variant) | Confirms reliability for automotive under-hood applications including engine control units and body electronics. |
Applications
| Automotive Power Input Protection | Industrial DC Power Supply Input |
|---|---|
Use Scenario: 12 V battery-fed ECU power rail exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly across input filter capacitor to clamp surges before they reach DC-DC converter ICs. Use Value: Limits transient voltage to ≤23.2 V, preserving 36 V-rated input stages of buck controllers and avoiding brownout resets. |
Use Scenario: 24 V industrial PLC power input subjected to inductive kickback from solenoid drivers and relay coils. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC bus, coordinated with upstream fuse and MOV for staged protection. Use Value: Absorbs 600 W surges without failure, maintaining system uptime where replacement downtime exceeds $2,000/hour. |
| Medical Equipment Isolated Interface | Telecom Line Card Surge Protection |
Use Scenario: 5 V isolated data acquisition front-end in patient-connected devices requiring UL 497B-certified protection. IC Role / Device Role / Timing Role: Secondary TVS on isolated side of digital isolator, guarding SPI/I²C lines against coupling transients. Use Value: UL 497B QVGQ2 recognition ensures compliance with IEC 60601-1 clause 8.8.3 for applied part isolation barriers. |
Use Scenario: T1/E1 line interface card in central office equipment facing lightning-induced common-mode surges on twisted-pair feeds. IC Role / Device Role / Timing Role: Unidirectional TVS on tip/ring differential pair, paired with gas discharge tube for primary coarse protection. Use Value: 1085 pF capacitance is acceptable for ≤2 Mbps data rates; clamping action preserves signal integrity during 10/1000 µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A | Lower peak power (400 W), higher clamping voltage (23.2 V vs. 23.2 V identical), same VRWM and package. | Not UL 497B recognized; unsuitable for certified isolated loop designs. | Select only for cost-sensitive, non-certified consumer applications with lower surge exposure. |
| 1.5SMC14A | Higher power (1500 W), larger SMC package (7.1 × 6.2 mm vs. SMB 4.3 × 3.6 mm), same electrical specs. | Requires PCB re-layout; better for high-reliability industrial systems needing >600 W headroom. | Choose when surge threat level exceeds IEC 61000-4-5 Level 4 or when thermal derating margin is critical. |
Compared with SMAJ14A and 1.5SMC14A, the 1SMB14AT3G delivers certified 600 W protection in the smallest standardized surface-mount TVS footprint, balancing space-constrained layout requirements with UL-compliant safety assurance for medical and telecom infrastructure.
Availability
1SMB14AT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC power inputs, medical isolated interfaces, and telecom line cards requiring stable component supply across multi-year production cycles.
Supply support for 1SMB14AT3G 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 manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1SMB14AT3G belongs to the SMB-series Zener TVS family, engineered specifically for high-energy transient suppression in space-constrained, safety-certified systems where reliability under repeated surge stress is mandatory.
FAQ
What is the maximum clamping voltage of the 1SMB14AT3G under full-rated surge current?
The 1SMB14AT3G has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 25.8 A (10/1000 µs waveform). This value is measured per Figure 2 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. Maintaining this clamping level ensures compatibility with 24 V system components rated for transient overvoltage up to 28 V.
Is the 1SMB14AT3G suitable for automotive applications requiring AEC-Q101 qualification?
The base 1SMB14AT3G is not AEC-Q101 qualified; however, its SZ-prefix variant - SZ1SMB14AT3G - is explicitly qualified to AEC-Q101 and PPAP capable per the datasheet's Features section. For automotive under-hood or chassis applications, designers must specify SZ1SMB14AT3G to meet qualification requirements; the 1SMB14AT3G remains appropriate for non-automotive industrial or medical uses.
Does the 1SMB14AT3G have UL 497B recognition, and what does that enable?
Yes, the entire 1SMBxxAT3G series, including the 1SMB14AT3G, holds UL 497B recognition (File #E210057, Category QVGQ2) for protector applications. This certification validates performance in isolated loop circuits - such as 4–20 mA current loops or RS-485 interfaces - and permits direct use in UL-listed end equipment without additional safety testing, accelerating time-to-market for medical and industrial systems.
How does the junction capacitance of the 1SMB14AT3G affect high-speed signal lines?
The 1SMB14AT3G exhibits a typical junction capacitance of 1085 pF at 0 V bias, which can degrade signal integrity on lines operating above ~1 MHz. It is therefore unsuitable for USB 2.0, HDMI, or Ethernet PHY protection. For such applications, lower-capacitance TVS devices (e.g., <100 pF) must be selected. The 1SMB14AT3G is best applied on power rails or low-speed control lines like CAN, LIN, or discrete I/O.
What is the thermal resistance and power derating behavior of the 1SMB14AT3G?
The 1SMB14AT3G has a junction-to-lead thermal resistance (RJL) of 25 °C/W and a junction-to-ambient resistance (RJA) of 226 °C/W on FR-4 board with minimum footprint. Its DC power dissipation derates linearly above 75 °C ambient (25 mW/°C), while peak pulse power must be reduced per Figure 3 in the datasheet when ambient exceeds 25 °C or pulse repetition increases - critical for designs operating in enclosed enclosures or high-temperature environments.
1SMB14AT3G 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 25.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1085pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB14AT3G FAQ
1.How can I place an order for 1SMB14AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB14AT3G 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 1SMB14AT3G reliable?
The price and inventory of 1SMB14AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB14AT3G is usually 5 days.
3.What payment methods are accepted for 1SMB14AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB14AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB14AT3G?
1SMB14AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB14AT3G 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 1SMB14AT3G?
For technical support, including 1SMB14AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB14AT3G requirements.
6.How does Aetrix verify that 1SMB14AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMB14AT3G 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 1SMB14AT3G meets industry standards.
7.What is the process for return or replacement of 1SMB14AT3G?
All 1SMB14AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB14AT3G, 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 1SMB14AT3G part is unused and in its original packaging.
Return procedure for 1SMB14AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB14AT3G Tags
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