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Taiwan Semiconductor Corporation SMBJ110A
- Part No.:
- SMBJ110A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ110A.pdf
- Description:
- TVS DIODE 110VWM 177VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SMBJ110A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power lines and signal paths. It features a 110 V working stand-off voltage (VWM), 122–135 V breakdown voltage (VBR), 177 V maximum clamping voltage (VC) at 3.5 A peak impulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ110A datasheet, SMBJ110A pinout, SMBJ110A application, or SMBJ110A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1 µA at 110 V, thermal resistance (RθJA = 55 °C/W), and compatibility with automated SMT placement on industrial and automotive PCBs.
Technical Context
The SMBJ110A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (122–135 V @ 1 mA). Its glass-passivated junction ensures stable breakdown and low leakage, while the DO-214AA package supports high surge current handling (3.5 A IPP) without thermal runaway up to TJ = 150 °C.
It complies with ISO 7637-2 for automotive transients and meets J-STD-020 moisture sensitivity level 1. The device exhibits fast response (<1 ps), low forward voltage (VF = 5.0 V @ 50 A for SMBJ100–SMBJ170 series), and UL 94V-0 mold compound - enabling robust ESD and EFT immunity in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 122 / 135 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPP | 177 V @ 3.5 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPK | 600 W - Peak non-repetitive surge power handling capability per IEC/ISO standards |
| ID @ VWM | ≤1 µA - Ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood or enclosed industrial enclosures |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient, critical for PCB copper area design |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 110 V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Sub-1 ps response time | Clamps transients before sensitive ICs experience damaging voltage overshoot |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching immunity (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling |
| RoHS & halogen-free | Meets IEC 61249-2-21 and environmental compliance for global industrial deployments |
Applications
| Automotive Power Line Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 110 V DC control bus in commercial vehicle ECUs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and ground, absorbing 600 W surges within nanoseconds. Use Value: Limits voltage to ≤177 V during ISO 7637-2 Pulse 5a, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding analog input channels of programmable logic controllers exposed to field-wiring transients. IC Role / Device Role / Timing Role: Standoff protector on 24–110 V sensor supply lines, activated only during EFT bursts or inductive kickback. Use Value: Maintains <1 µA leakage at 110 V, preserving signal integrity and measurement accuracy in high-impedance front-end circuits. |
| LED Driver Overvoltage Clamp | Telecom DC Feeder Protection |
Use Scenario: Securing constant-current LED drivers in streetlight systems subjected to lightning-induced surges on AC/DC rails. IC Role / Device Role / Timing Role: Primary clamping device across output terminals, triggered by >122 V reverse excursions. Use Value: Clamps 3.5 A 10/1000 µs surge to 177 V, preventing latch-up or gate oxide rupture in driver MOSFETs. | Use Scenario: Protecting -48 V telecom power feeds from induced surges due to nearby lightning strikes or switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS on negative rail, referenced to system ground with cathode tied to feed line. Use Value: Delivers 600 W surge rating with RθJA = 55 °C/W, supporting sustained operation in sealed outdoor cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ110CA | Bidirectional variant; symmetric VBR (122–135 V) in both polarities; same VWM, VC, and PPK | Required where AC-coupled or bipolar transients (e.g., RS-485 data lines) must be suppressed | Select SMBJ110CA only if bidirectional clamping is needed; SMBJ110A is optimal for DC rail protection |
| SMCJ110A | Larger DO-214AB (SMC) package; higher IPP (6.5 A), same VWM/VBR/VC; RθJA = 35 °C/W | Better thermal performance for high-duty-cycle surges; requires larger PCB footprint | Choose SMCJ110A when surge repetition rate or ambient temperature exceeds SMBJ110A derating limits |
Compared with SMBJ110A, SMBJ110CA adds bidirectional symmetry at no clamping voltage penalty but increases capacitance slightly; SMCJ110A trades compactness for superior thermal dissipation and higher single-pulse current capacity - making it suitable for more demanding surge profiles.
Availability
SMBJ110A is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial PLC input conditioning, LED driver overvoltage clamping, and telecom DC feeder safeguarding requiring stable component supply across production lifecycles.
Supply support for SMBJ110A 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, and protection devices since 1979.
The SMBJ series was developed specifically for high-reliability surface-mount surge suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, low leakage, and automated assembly compatibility.
FAQ
What is the clamping voltage of SMBJ110A under a standard 10/1000 µs surge?
The SMBJ110A has a maximum clamping voltage (VC) of 177 V when subjected to its rated peak impulse current of 3.5 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 177 V during transient events - critical for protecting 200 V-rated capacitors and 160 V MOSFETs in 110 V systems.
Is SMBJ110A unidirectional or bidirectional?
SMBJ110A is a unidirectional TVS diode, intended for DC circuit protection where polarity is fixed. Its cathode band marks the terminal connected to the protected line, and it conducts only during reverse overvoltage. For bidirectional use, the SMBJ110CA variant is specified - the "A" suffix in SMBJ110A denotes unidirectional construction with tighter VBR tolerance (122–135 V vs. 122–149 V for SMBJ110).
What is the maximum leakage current of SMBJ110A at its working voltage?
At its working stand-off voltage of 110 V, the SMBJ110A exhibits a maximum blocking leakage current (ID) of 1 µA at 25 °C. This ultra-low leakage preserves efficiency in high-impedance monitoring circuits and prevents false triggering in precision analog inputs - verified per electrical specifications table in Taiwan Semiconductor's R2104 datasheet.
Does SMBJ110A meet automotive transient immunity standards?
Yes, SMBJ110A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as explicitly stated in the product features. Its 600 W peak power rating, fast response (<1 ps), and controlled clamping behavior make it suitable for 12 V/24 V/48 V/110 V automotive subsystems including body control modules and lighting drivers.
What is the thermal resistance and maximum junction temperature of SMBJ110A?
SMBJ110A has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and a maximum junction temperature (TJ) of +150 °C. These values define its safe operating area: at 25 °C ambient, it can dissipate up to 3 W continuously, and its surge capability derates linearly above that temperature per Figure 2 in the datasheet - essential for thermal layout validation in enclosed enclosures.
SMBJ110A 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):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 177V
- Current - Peak Pulse (10/1000µs):
- 3.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ110A FAQ
1.How can I place an order for SMBJ110A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ110A 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 SMBJ110A reliable?
The price and inventory of SMBJ110A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ110A is usually 5 days.
3.What payment methods are accepted for SMBJ110A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ110A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ110A?
SMBJ110A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ110A 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 SMBJ110A?
For technical support, including SMBJ110A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ110A requirements.
6.How does Aetrix verify that SMBJ110A is sourced from the original manufacturer or authorized distributors?
All SMBJ110A 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 SMBJ110A meets industry standards.
7.What is the process for return or replacement of SMBJ110A?
All SMBJ110A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ110A, 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 SMBJ110A part is unused and in its original packaging.
Return procedure for SMBJ110A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ110A Tags
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