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Taiwan Semiconductor Corporation SMAJ110CH
- Part No.:
- SMAJ110CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110CH.pdf
- Description:
- TVS DIODE 110VWM 196VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,676
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Product details
Overview
SMAJ110CH from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection with 110V working stand-off voltage, 122–149V breakdown range at 1mA, and 196V maximum clamping voltage at 1.6A peak impulse current under 10/1000μs waveform. It meets AEC-Q101 qualification and ISO 7637-2 Pulse 1/2a/2b/3a/3b for vehicle electronics.
For engineers reviewing the SMAJ110CH datasheet, SMAJ110CH pinout, SMAJ110CH application, or SMAJ110CH equivalent, this device is selected for robust DC bus protection in automotive power modules, on-board DC/DC converters, and industrial SMPS where fast clamping (<1ps response), low leakage (<1μA @ 110V), and high surge immunity are critical.
Technical Context
The SMAJ110CH employs a glass-passivated silicon junction optimized for unidirectional transient suppression. Its clamping behavior is defined by a 10/1000μs waveform with 400W peak pulse power rating at 25°C, derated linearly above that ambient temperature per Fig.2. The device operates within -55°C to +150°C junction range and features matte tin-plated leads compliant with J-STD-002 solderability.
It exhibits <1μA reverse leakage at its 110V VWM, 196V VC at IPPM = 1.6A, and a typical forward voltage of 3.5V at 25A surge-enabling reliable fault isolation without latch-up in 12V/24V/48V automotive subsystems. Polarity is marked by cathode band per DO-214AC mechanical drawing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 122 V / 149 V @ 1 mA - Confirmed breakdown threshold ensures predictable turn-on margin above VWM |
| VC @ IPPM | 196 V @ 1.6 A (10/1000μs) - Clamping voltage limits downstream IC stress during load dump or inductive switching |
| PPPM | 400 W (10/1000μs, TA = 25°C) - Sustains single high-energy transients common in automotive ISO 7637-2 testing |
| IR @ VWM | <1 μA - Negligible standby power loss and signal integrity impact in always-on circuits |
| TJ max | +150 °C - Enables placement near heat sources in engine control units and power inverters |
| Package | DO-214AC (SMA) - Surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band, weight ≈0.060g, UL 94V-0 rated compound, JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., ground or return) in unidirectional configuration |
| Cathode | Clamping node / protected line connection | Connected to protected line (e.g., 110V rail); conducts when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock |
| Fast response time | <1.0 ps from 0 V to VBR min - Limits voltage overshoot before sensitive circuitry reacts |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and IR under thermal/humidity stress |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow - simplifies SMT manufacturing flow |
Applications
| Automotive Engine Control Unit (ECU) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and sensor supply rails from load dump spikes up to 120V during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V battery rail and local LDO input to clamp transients before regulation. Use Value: 196V clamping ensures downstream 3.3V/5V logic remains below absolute maximum ratings during 100ms ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields primary-side gate drivers and feedback optocouplers in isolated 48V-to-12V flyback converters used in telecom power systems. IC Role / Device Role / Timing Role: Mounted across bulk capacitor terminals to absorb reflected energy from transformer leakage inductance. Use Value: 400W peak power rating handles repetitive 10/1000μs surges without thermal runaway, maintaining >10⁵ cycle lifetime. |
| On-Board Charger (OBC) Auxiliary Power Supply | LED Driver for Commercial Lighting |
Use Scenario: Safeguards auxiliary 15V SMPS supplying MCU, CAN transceivers, and gate drivers in EV on-board chargers exposed to CAN bus ESD and relay bounce. IC Role / Device Role / Timing Role: Placed at AC-DC rectifier output to suppress line-to-line and line-to-ground transients entering low-voltage domain. Use Value: 110V VWM matches nominal 120VAC-derived rail while 122–149V VBR provides 12–39V design margin against sustained overvoltage. |
Use Scenario: Protects constant-current LED driver ICs from surge events induced by nearby motor starts or lightning-induced coupling in parking lot lighting systems. IC Role / Device Role / Timing Role: Connected across driver output terminals to clamp inductive kickback from long LED string wiring. Use Value: 1.6A IPPM capability absorbs 1kV/0.5Ω ring wave surges per IEC 61000-4-5 Level 3, preventing driver latch-up or MOSFET avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110A | Lower VBR range (122–135V) and higher IR (1.7μA vs. 1.6μA); same package and clamping (177V @ 1.7A) | Better suited for tighter VBR tolerance requirements where lower clamping voltage offsets higher leakage | Select SMAJ110A if system-level validation shows 177V clamping improves margin over 196V, accepting slightly higher leakage |
| SMCJ110A | Higher power rating (1500W), larger DO-214AB (SMC) package, same VWM/VBR/VC specs | Used where higher surge repetition rate or longer pulse duration (>10/1000μs) demands greater thermal mass | Choose SMCJ110A only when PCB layout allows larger footprint and thermal management supports 1500W dissipation |
Compared with SMAJ110CH, SMAJ110A offers lower clamping but higher leakage, while SMCJ110A delivers 3.75× higher peak power in a physically larger package-neither is pin-compatible, but both serve overlapping protection roles with distinct thermal and layout trade-offs.
Availability
SMAJ110CH is available at Aetrix Electronics and suitable for automotive ECU designs, industrial DC/DC converter inputs, and LED driver protection requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ110CH 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 power devices since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting ISO 7637-2 Pulse 1–3b immunity in compact surface-mount form factors for space-constrained ECUs and ADAS modules.
FAQ
What is the polarity configuration of SMAJ110CH?
The SMAJ110CH is a unidirectional TVS diode with cathode marked by a band on the DO-214AC package. It conducts only when the cathode is at higher potential than the anode-making it suitable for protecting positive rails referenced to ground. This differs from bidirectional variants like SMAJ110C, which lack polarity marking and conduct symmetrically.
Does SMAJ110CH meet automotive qualification standards?
Yes, SMAJ110CH is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b standards. Its construction-including glass-passivated junction, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1-ensures reliability in automotive underhood environments per TSC's A2102 specification.
What is the maximum clamping voltage of SMAJ110CH under standard test conditions?
The SMAJ110CH has a maximum clamping voltage (VC) of 196 V when subjected to a 10/1000μs waveform with a peak impulse current (IPPM) of 1.6 A at 25°C ambient. This value is guaranteed per the datasheet's electrical specifications table and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMAJ110CH be used in bidirectional protection applications?
No-SMAJ110CH is unidirectional and not rated for reverse conduction. For bidirectional protection, use SMAJ110C (CH suffix indicates unidirectional; CAH or C suffix denotes bidirectional). Attempting bidirectional use of SMAJ110CH risks permanent damage due to reverse breakdown beyond its specified limits.
What is the thermal derating behavior of SMAJ110CH above 25°C ambient?
SMAJ110CH's peak pulse power (PPPM) is derated linearly above 25°C ambient per Fig.2 in the datasheet: at 75°C, PPPM drops to ~280W; at 125°C, it falls to ~120W. This reflects junction temperature rise limiting safe energy absorption-designers must ensure board-level thermal resistance keeps TJ ≤150°C during surge events.
SMAJ110CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 110V
- Voltage - Breakdown (Min):
- 122V
- Voltage - Clamping (Max) @ Ipp:
- 196V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ110CH FAQ
1.How can I place an order for SMAJ110CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110CH 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 SMAJ110CH reliable?
The price and inventory of SMAJ110CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110CH is usually 5 days.
3.What payment methods are accepted for SMAJ110CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110CH?
SMAJ110CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110CH 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 SMAJ110CH?
For technical support, including SMAJ110CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110CH requirements.
6.How does Aetrix verify that SMAJ110CH is sourced from the original manufacturer or authorized distributors?
All SMAJ110CH 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 SMAJ110CH meets industry standards.
7.What is the process for return or replacement of SMAJ110CH?
All SMAJ110CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110CH, 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 SMAJ110CH part is unused and in its original packaging.
Return procedure for SMAJ110CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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