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Taiwan Semiconductor Corporation SMAJ110H
- Part No.:
- SMAJ110H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110H.pdf
- Description:
- TVS DIODE 110VWM 196VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,563
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Product details
Overview
SMAJ110H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade overvoltage protection in DC power rails. It features a 110V working stand-off voltage (VWM), 122–149V breakdown voltage (VBR) at 1mA test current, and clamps to ≤196V at 1.6A peak impulse current under 10/1000μs waveform - deployed in on-board DC/DC converters and SMPS input stages.
For engineers reviewing the SMAJ110H datasheet, SMAJ110H pinout, SMAJ110H application, or SMAJ110H equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and verified clamping performance at 110V system level.
Technical Context
The SMAJ110H operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response from 0V to VBR min. Its thermal design supports continuous operation up to TJ = +150°C and steady-state power dissipation of 1W, with peak pulse power rated at 400W (10/1000μs) - derated linearly above TA = 25°C per Fig.2.
It exhibits <1μA reverse leakage at VWM = 110V, maximum clamping voltage VC = 196V at IPPM = 1.6A, and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - confirming suitability for reflow-soldered automotive and industrial PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR min/max | 122 V / 149 V @ IT = 1 mA - Confirmed avalanche onset range ensuring reliable turn-on margin above system operating voltage. |
| VC @ IPPM | 196 V @ 1.6 A (10/1000μs) - Clamped voltage during surge, defining maximum stress imposed on downstream circuitry. |
| PPPM | 400 W (10/1000μs) - Peak transient energy absorption capacity, validated per REA-defined waveform. |
| IR @ VWM | <1 μA - Negligible leakage current at rated stand-off, minimizing standby power loss in high-impedance rails. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with cathode band marking and 0.060g mass. |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements including temperature cycling and HTRB. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band; compliant with UL 94V-0 flammability rating and J-STD-002 solderability standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential rail; defines forward conduction path during surge clamp. |
| Cathode | High-side protected node | Connected to protected line (e.g., 110V DC bus); conducts avalanche current when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and powertrain applications requiring extended temperature and reliability validation. |
| Glass-passivated junction | Enables stable VBR tolerance and long-term leakage stability across thermal cycling and humidity exposure. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity requirements. |
| Fast response time | <1.0 ps from 0 V to VBR min - ensures clamping activation before sensitive downstream ICs experience overvoltage damage. |
| Moisture sensitivity Level 1 | No floor life limitation or bake requirement prior to reflow, simplifying SMT manufacturing flow. |
Applications
| Automotive On-Board Charger Input | Industrial SMPS DC Bus Protection |
|---|---|
Use Scenario: Protects 110V DC input stage of bidirectional OBC against load dump and ISO 7637-2 Pulse 1 transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between DC+ and chassis ground, clamping surges within 1ps. Use Value: Limits transient voltage to ≤196V, preserving integrity of upstream EMI filter and downstream DC/DC controller ICs. |
Use Scenario: Shields 110V intermediate bus in telecom rectifier modules from switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor mounted at bus entry point, absorbing 400W pulses without degradation. Use Value: Maintains <1μA leakage at 110V, avoiding unnecessary power loss while delivering certified ISO 7637-2 Pulse 2b immunity. |
| LED Driver Power Supply Input | Rail-to-Rail DC/DC Converter Protection |
Use Scenario: Guards constant-current LED driver input against inductive kickback from relay-controlled 110V AC/DC front-end. IC Role / Device Role / Timing Role: Unidirectional clamping diode referenced to ground, activated only during positive overvoltage events. Use Value: Withstands 40A IFSM surge (8.3ms half-sine), preventing failure during repeated relay switching cycles. |
Use Scenario: Integrated into isolated 110V-to-12V DC/DC converter PCB layout to protect primary-side MOSFET gate drivers. IC Role / Device Role / Timing Role: Fast-response TVS placed across input capacitor terminals to suppress ringing and overshoot. Use Value: Delivers 196V clamping at 1.6A, keeping gate-source voltage within safe SOA limits of SiC or GaN FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110AH | Lower VBR range (122–135V vs. 122–149V); tighter 110V VWM tolerance; same DO-214AC package. | Better suited for precision 110V systems where lower clamping variance improves margin control. | Select SMAJ110AH when tighter VBR distribution is required; SMAJ110H offers broader surge margin at higher VBR max. |
| SMCJ110H | Higher PPPM (1500W vs. 400W); same VWM/VBR specs; larger DO-214AB (SMC) package. | Used where higher single-pulse energy (e.g., ISO 7637-2 Pulse 1 with >100V/microsecond dv/dt) must be absorbed. | Choose SMCJ110H only if board space allows DO-214AB and system requires >400W pulse handling; SMAJ110H fits tighter layouts. |
Compared with SMAJ110AH and SMCJ110H, the SMAJ110H balances AEC-Q101 compliance, DO-214AC footprint efficiency, and 400W ISO 7637-2 coverage - making it optimal for space-constrained automotive and industrial 110V rail protection where full 1500W capability is unnecessary.
Availability
SMAJ110H is available at Aetrix Electronics and suitable for automotive on-board chargers, industrial SMPS designs, LED driver inputs, and rail-to-rail DC/DC converters requiring stable component supply with AEC-Q101 assurance and DO-214AC mounting compatibility.
Supply support for SMAJ110H 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 automotive-qualified power devices.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in 12V–188V automotive and industrial power systems, emphasizing fast response, low leakage, and robust package reliability.
FAQ
What is the clamping voltage of SMAJ110H under standard 10/1000μs surge conditions?
The SMAJ110H clamps to a maximum of 196 V when subjected to its rated peak impulse current of 1.6 A using the 10/1000μs waveform. This value is measured per REA-defined test conditions and represents the upper limit of voltage seen by protected circuitry during a transient event - critical for validating downstream component voltage ratings in 110V systems.
Is SMAJ110H suitable for bidirectional transient protection?
No, SMAJ110H is a unidirectional TVS diode intended for DC circuits with defined polarity. For bidirectional protection at 110V, Taiwan Semiconductor specifies the SMAJ110CH or SMAJ110CAH variants - which feature symmetrical breakdown in both directions and distinct marking codes and electrical curves.
Does SMAJ110H meet automotive qualification standards?
Yes, SMAJ110H is AEC-Q101 qualified and tested per the full stress test schedule including HTGB, TCT, and HTRB. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming suitability for automotive power electronics such as body control modules and on-board chargers.
What is the maximum steady-state power dissipation rating for SMAJ110H?
The SMAJ110H has a steady-state power dissipation (PD) rating of 1 W at TA = 25°C. This value decreases linearly with ambient temperature per the pulse derating curve (Fig.2), reaching approximately 0.5 W at TA = 100°C - important for thermal design in enclosed or high-temperature environments.
How does SMAJ110H differ from SMAJ110AH in practical design use?
SMAJ110AH has a narrower breakdown voltage range (122–135V vs. 122–149V for SMAJ110H) and identical VWM = 110V, resulting in more consistent clamping behavior across production lots. Designers select SMAJ110H when wider VBR tolerance is acceptable and higher maximum clamping margin is beneficial; SMAJ110AH is preferred for tighter voltage-margin systems.
SMAJ110H 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ110H FAQ
1.How can I place an order for SMAJ110H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110H 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 SMAJ110H reliable?
The price and inventory of SMAJ110H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110H is usually 5 days.
3.What payment methods are accepted for SMAJ110H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110H?
SMAJ110H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110H 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 SMAJ110H?
For technical support, including SMAJ110H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110H requirements.
6.How does Aetrix verify that SMAJ110H is sourced from the original manufacturer or authorized distributors?
All SMAJ110H 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 SMAJ110H meets industry standards.
7.What is the process for return or replacement of SMAJ110H?
All SMAJ110H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110H, 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 SMAJ110H part is unused and in its original packaging.
Return procedure for SMAJ110H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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