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Taiwan Semiconductor Corporation SMBJ14A
- Part No.:
- SMBJ14A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:11,532
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Product details
Overview
SMBJ14A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 14 V working stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR), 27.0 A peak pulse current (IPP), 23.2 V maximum clamping voltage (VC) at IPP, and 600 W peak pulse power (PPK) with 10/1000 µs waveform - deployed in automotive body electronics, industrial I/O modules, and USB port protection.
For engineers reviewing the SMBJ14A datasheet, SMBJ14A pinout, SMBJ14A application, or SMBJ14A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional polarity marking, DO-214AA (SMB) package thermal limits (RθJA = 55 °C/W), and leakage current ≤1 µA at 14 V.
Technical Context
The SMBJ14A operates as a silicon avalanche diode with glass-passivated junction, enabling sub-1 ps response time and stable clamping during fast transients. Its unidirectional configuration provides forward conduction only - with VF = 3.5 V at IF = 50 A - and requires cathode-band orientation on PCB layout.
Thermally, it supports junction temperatures from –55 °C to +150 °C, with RθJC = 10 °C/W and steady-state power dissipation of 3 W at TA = 25 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR @ IT = 1 mA | 15.6–17.2 V - Minimum/maximum voltage at which avalanche breakdown initiates; defines turn-on threshold |
| VC @ IPP = 27.0 A | 23.2 V - Clamped voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream ICs |
| PPK (10/1000 µs) | 600 W - Peak transient energy absorption capability; validates compliance with ISO 7637-2 Pulse 3b |
| ID @ VWM | ≤1 µA - Leakage current at rated stand-off voltage; ensures minimal standby power loss in battery-powered systems |
| TJ max | +150 °C - Maximum allowable junction temperature; sets thermal derating boundary for high-ambient designs |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, 0.090 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line (e.g., VBUS, signal source) | Connected to transient source; conducts surge current toward cathode when reverse-biased beyond VBR |
| Cathode | Return path to ground or low-impedance reference | Marked by band; must connect to system ground plane or low-inductance return to ensure effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| Clamping ratio VC/VBR | 1.35–1.48 - Low ratio ensures tight voltage control during surges, reducing risk of overvoltage damage to 3.3 V/5 V logic |
| Response time | <1.0 ps - Enables suppression of ESD events per IEC 61000-4-2 (8 kV contact / 15 kV air) before IC latch-up occurs |
| ISO 7637-2 compliance | Pulse 1, 2a, 2b, 3a, 3b - Validated for automotive load-dump and inductive-switching immunity without external filtering |
| Moisture sensitivity | Level 1 (J-STD-020) - No bake requirement prior to reflow; supports standard SMT assembly processes |
| RoHS & halogen-free | Compliant per IEC 61249-2-21 - Meets environmental requirements for industrial and automotive end equipment |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Channel |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power pins from load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply rail and local ground, clamping spikes within 23.2 V to prevent overvoltage on 5 V LDO input. Use Value: Eliminates need for series resistors or RC filters while maintaining <1 µA leakage - preserving sleep-mode current budget in always-on BCM nodes. |
Use Scenario: Shields 24 V digital input optocoupler front-end from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Standoff-rated TVS across input terminals, conducting surge current away from opto-isolator LED anode/cathode during switch-off. Use Value: Withstands 100 A IFSM surge (8.3 ms half-sine), enabling direct interface with 24 V industrial actuators without derating or redundancy. |
| USB 2.0 Host Port Protection | LED Driver Power Input Stage |
Use Scenario: Guards D+ and D− data lines and VBUS against ESD and hot-plug transients in embedded host controllers. IC Role / Device Role / Timing Role: Paired unidirectional SMBJ14A devices on VBUS and bidirectional variants on data lines - leveraging fast response to clamp sub-ns ESD events. Use Value: 23.2 V clamping ensures VBUS stays below 25 V absolute maximum rating of USB PHY ICs during 8 kV contact discharge. |
Use Scenario: Suppresses switching noise and flyback spikes at the input of constant-current LED drivers powering streetlight arrays. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input terminals to absorb repetitive 600 W surges from nearby AC line switching or lightning-induced coupling. Use Value: 600 W PPK rating and 55 °C/W RθJA allow sustained operation at 85 °C ambient without thermal runaway in enclosed outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA | Bidirectional variant; symmetric VBR (15.6–17.2 V) in both polarities; same PPK, VC, and package | Required where AC-coupled signals or differential buses (e.g., RS-485, CAN) need protection without polarity constraints | Select SMBJ14CA only if bidirectional clamping is mandatory; SMBJ14A offers lower leakage and simpler layout for DC rails |
| SAC14 | Same VWM (14 V), but lower PPK (400 W); higher VC (25.5 V); TO-220AC package (not surface-mount) | Used in legacy through-hole designs or high-power industrial SMPS where heat sinking is available | SMBJ14A preferred for space-constrained SMT applications requiring 600 W rating and DO-214AA footprint compatibility |
Compared with SMBJ14CA and SAC14, the SMBJ14A delivers optimal balance of high surge capacity, low clamping voltage, and SMT manufacturability for unidirectional DC protection - making it the default choice for modern automotive and industrial PCBs where layout density and ISO 7637-2 compliance are critical.
Availability
SMBJ14A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, USB host port protection, and LED driver input stages requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMBJ14A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management components since 1979.
The SMBJ series was developed specifically for robust, high-power transient suppression in automotive and industrial environments - emphasizing ISO 7637-2 compliance, low clamping ratios, and automated assembly readiness in DO-214AA packaging.
FAQ
What is the maximum clamping voltage of SMBJ14A under a 10/1000 µs surge?
The SMBJ14A has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current of 27.0 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 23.2 V during standardized surge events - critical for protecting 24 V-tolerant interfaces and 5 V logic supplies.
Is SMBJ14A unidirectional or bidirectional, and how is polarity marked?
SMBJ14A is a unidirectional TVS diode, with polarity indicated by a cathode band on the DO-214AA (SMB) package body. The banded end connects to ground or the low-side reference; the opposite end connects to the line being protected. Bidirectional operation requires the SMBJ14CA variant, which uses a different marking code and symmetrical breakdown behavior.
Does SMBJ14A meet automotive transient immunity standards?
Yes, SMBJ14A meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling and ignition noise) requirements. Its 600 W peak pulse power rating, fast <1 ps response, and validated clamping performance make it suitable for front-end protection in automotive body control, infotainment, and lighting modules.
What is the leakage current specification for SMBJ14A at its working voltage?
At its working stand-off voltage (VWM) of 14 V, the SMBJ14A exhibits a maximum blocking leakage current (ID) of 1 µA at TA = 25 °C. This ultra-low leakage preserves battery life in always-on automotive modules and avoids false triggering in high-impedance sensor interfaces - confirmed per test condition ID@VWM in TSC's official SMBJ datasheet R2104.
Can SMBJ14A be used in place of SMBJ14 in a design?
Yes, SMBJ14A replaces SMBJ14 with improved clamping performance: SMBJ14A has a lower maximum clamping voltage (23.2 V vs. 25.8 V) and tighter breakdown range (15.6–17.2 V vs. 15.6–19.1 V), resulting in better protection margin for sensitive 3.3 V or 5 V ICs. Both share identical DO-214AA packaging and pinout, enabling drop-in replacement without layout changes.
SMBJ14A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- 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):
- 25.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ14A FAQ
1.How can I place an order for SMBJ14A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14A 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 SMBJ14A reliable?
The price and inventory of SMBJ14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14A is usually 5 days.
3.What payment methods are accepted for SMBJ14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14A?
SMBJ14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14A 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 SMBJ14A?
For technical support, including SMBJ14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14A requirements.
6.How does Aetrix verify that SMBJ14A is sourced from the original manufacturer or authorized distributors?
All SMBJ14A 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 SMBJ14A meets industry standards.
7.What is the process for return or replacement of SMBJ14A?
All SMBJ14A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14A, 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 SMBJ14A part is unused and in its original packaging.
Return procedure for SMBJ14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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