My Inquiry
My Account
onsemi 1SMB14AT3
- Part No.:
- 1SMB14AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB14AT3.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,005
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMB14AT3 from onsemi is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) diode in SMB package, designed for parallel overvoltage protection of sensitive electronics. It features a 14 V working peak reverse voltage (VRWM), 17.2 V maximum clamping voltage (VC) at 25.8 A peak pulse current (IPP), and sub-1 ns response time - ideal for safeguarding DC power rails and I/O lines in industrial power supplies and automotive ECUs.
For engineers reviewing the 1SMB14AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < IC absolute maximum rating, IPP capability under defined surge waveform (10/1000 µs), UL 497B recognition for isolated loop protection, and Pb-free SMB package compatibility with automated SMT assembly.
Technical Context
The 1SMB14AT3 operates as a unidirectional avalanche diode, conducting only during positive transients relative to cathode polarity. Its Zener-based breakdown mechanism provides precise voltage clamping with low dynamic impedance, enabling fast energy diversion away from protected circuitry without latch-up or degradation under single-pulse stress.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), supports 100 A forward surge current (8.3 ms half-sine), and maintains ≤5.0 µA leakage above 10 V at 25°C - ensuring minimal standby power impact while delivering robust ESD immunity (>16 kV HBM) and reliable operation from −65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1.0 ms (10/1000 µs waveform); defines maximum transient energy absorption before failure |
| Working Peak Reverse Voltage (VRWM) | 14 V; maximum continuous DC or peak AC voltage the device blocks without conduction |
| Clamping Voltage (VC) | 23.2 V @ IPP = 25.8 A; maximum voltage seen by protected load during specified surge event |
| Breakdown Voltage (VBR) | 15.6–17.2 V @ IT = 1.0 mA; ensures predictable turn-on threshold with tight tolerance band |
| Leakage Current (IR) | ≤5.0 µA @ VRWM = 14 V; guarantees negligible standby current draw in high-impedance circuits |
| Response Time | <1.0 ns; enables suppression before transient propagates into downstream ICs |
| ESD Rating | Class 3 (>16 kV) per Human Body Model; meets stringent electrostatic discharge immunity requirements |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads; cathode indicated by polarity band; RoHS-compliant and Pb-free (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or reverse clamping | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration |
| Cathode | Current exit terminal during clamping; marked with band | Connected to protected line (e.g., 12 V rail); clamps to anode when voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - validated for strike voltage, endurance, dielectric withstand, and discharge performance |
| Low Clamping Ratio (VC/VBR) | ~1.48 (23.2 V / 15.6 V); minimizes overvoltage stress on downstream components during surge events |
| Thermal Robustness | RJA = 226 °C/W (FR-4 board); supports stable operation up to +150°C junction temperature with proper PCB layout |
| High Surge Capability | 25.8 A IPP at 14 V VRWM; handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) with margin |
| Pb-Free & Solderable Leads | Compatible with standard reflow profiles (260°C for 10 s); corrosion-resistant finish ensures long-term solder joint reliability |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 12 V DC input stage of programmable logic controller (PLC) power supply against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients before they reach buck converter IC and microcontroller. Use Value: Limits voltage to ≤23.2 V during 25.8 A surge, preventing damage to 36 V-rated input capacitors and 24 V max-rated controller ICs. |
Use Scenario: Safeguarding LIN bus transceiver and sensor inputs in BCM against battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Cathode tied to LIN line, anode to chassis ground; clamps negative-going transients and positive surges exceeding 14 V. Use Value: Maintains signal integrity under ±100 V transients per ISO 16750-2 while adding only 1085 pF capacitance at 0 V bias. |
| Medical Equipment Input Stage | Telecom Interface Protection |
Use Scenario: Shielding auxiliary 5–24 V power inputs of patient monitor front-end from ESD and AC line coupling events. IC Role / Device Role / Timing Role: Parallel-connected TVS on each isolated DC input rail, referenced to local safety ground. Use Value: Provides >16 kV HBM ESD immunity and clamps 1 kV/50 Ω surge to <23.2 V within 1 ns - preserving analog front-end accuracy. |
Use Scenario: Protecting RS-485 transceiver VCC and data lines in base station remote unit exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Used on VCC rail (cathode to 3.3 V, anode to GND) to prevent overvoltage shutdown during induced transients. Use Value: Delivers 600 W peak power handling with 23.2 V clamping - below 27 V absolute max rating of transceiver ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A | Same VRWM (14 V), slightly higher VC (23.8 V @ 25.1 A), identical SMB package and UL 497B recognition | Identical use cases; minor derating needed for margin-critical 24 V systems | Select SMBJ14A if sourcing from alternate distributor with better lead time; same PCB footprint and electrical behavior |
| 1.5SMC14A | Higher peak power (1500 W), larger SMC package (7.1 × 6.2 mm vs. SMB's 4.6 × 3.6 mm), same VRWM/VC specs | Preferred where higher surge margin is required and board space allows larger footprint | Choose 1.5SMC14A for mission-critical 12 V automotive modules needing >1500 W surge rating |
Compared with 1SMB14AT3, SMBJ14A offers near-identical protection performance in the same compact SMB form factor, while 1.5SMC14A trades size for significantly higher surge capacity - making it suitable for environments with repeated high-energy transients where thermal recovery and mechanical robustness are prioritized.
Availability
1SMB14AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, medical equipment input stages, and telecom interface protection requiring stable component supply and full traceability.
Supply support for 1SMB14AT3 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and medical markets.
The 1SMB14AT3 belongs to the SMB series of unidirectional TVS diodes engineered for high-reliability overvoltage protection in harsh environments - emphasizing low clamping, fast response, and regulatory compliance (UL 497B) for safety-critical systems.
FAQ
What is the maximum clamping voltage of the 1SMB14AT3 under surge conditions?
The 1SMB14AT3 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 at the device terminals and represents the highest voltage that will appear across the protected circuit during a standardized surge event - critical for ensuring downstream ICs remain within their absolute maximum ratings. The 1SMB14AT3 achieves this with low dynamic impedance and sub-1 ns response.
Is the 1SMB14AT3 RoHS-compliant and suitable for lead-free reflow?
Yes, the "G" suffix in 1SMB14AT3 indicates a Pb-free package compliant with RoHS Directive 2011/65/EU. It supports standard lead-free reflow profiles with a maximum soldering temperature of 260°C for 10 seconds, and all external surfaces are corrosion-resistant and readily solderable. The 1SMB14AT3 uses ON Semiconductor's Surmetic molding compound and modified L-bend leads optimized for high-yield SMT assembly without tombstoning or wetting issues.
Does the 1SMB14AT3 meet UL 497B certification for isolated loop protection?
Yes, the entire 1SMB5.0AT3 series - including the 1SMB14AT3 - holds UL 497B recognition (File #E210057, Category QVGQ2) for protectors used in isolated loop circuits. This certification validates performance across multiple tests: strike voltage breakdown, endurance conditioning, temperature cycling, dielectric voltage-withstand, and discharge testing - exceeding basic flammability-only approvals offered by some competitors.
What is the leakage current specification for the 1SMB14AT3 at its working voltage?
The 1SMB14AT3 specifies a maximum reverse leakage current (IR) of 5.0 µA when biased at its working peak reverse voltage of 14 V and measured at 25°C. This ultra-low leakage ensures minimal power loss in always-on systems such as battery-backed sensors or standby power rails, and supports high-impedance monitoring circuits without introducing measurement error or premature discharge.
Can the 1SMB14AT3 be used in bidirectional transient protection applications?
No, the 1SMB14AT3 is a unidirectional TVS diode and conducts only during positive transients relative to its cathode terminal. For bidirectional protection (e.g., AC lines or differential buses), a dedicated bidirectional part such as 1SMB14CAT3 must be used. Using the 1SMB14AT3 in reverse-biased configurations risks permanent breakdown or failure, as it lacks symmetrical avalanche characteristics in both polarities.
1SMB14AT3 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):
- 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
1SMB14AT3 FAQ
1.How can I place an order for 1SMB14AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB14AT3 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 1SMB14AT3 reliable?
The price and inventory of 1SMB14AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB14AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB14AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB14AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB14AT3?
1SMB14AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB14AT3 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 1SMB14AT3?
For technical support, including 1SMB14AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB14AT3 requirements.
6.How does Aetrix verify that 1SMB14AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB14AT3 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 1SMB14AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB14AT3?
All 1SMB14AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB14AT3, 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 1SMB14AT3 part is unused and in its original packaging.
Return procedure for 1SMB14AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB14AT3 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…
