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Taiwan Semiconductor Corporation SMAJ110AH
- Part No.:
- SMAJ110AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ110AH.pdf
- Description:
- TVS DIODE 110VWM 177VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,026
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Product details
Overview
SMAJ110AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 110V working stand-off voltage (VWM), 122–135V breakdown voltage (VBR), and 177V maximum clamping voltage (VC) at 1.7A peak impulse current-designed for automotive-grade DC/DC converter input protection per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMAJ110AH datasheet, SMAJ110AH pinout, SMAJ110AH application, or SMAJ110AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under 10/1000μs surge, moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance-key selection criteria for robust automotive and industrial power rail protection.
Technical Context
The SMAJ110AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1ps response time from 0 V to VBR min. Its clamping action limits transient overvoltage on protected lines during fast-rising ESD or load-dump events while maintaining <1μA reverse leakage above 110V.
Rated for 400W peak pulse power (10/1000μs waveform) up to 150°C junction temperature, it supports bidirectional variants via CH/CAH suffixes but is strictly unidirectional-cathode band marked-requiring correct polarity placement in series with the protected line.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 110 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR @ IT=1mA | 122–135 V - Breakdown initiates within this range, ensuring reliable turn-on before system damage |
| VC @ IPPM=1.7A | 177 V - Clamped voltage seen by downstream circuitry during 10/1000μs surge, defining protection margin |
| PPPM (10/1000μs) | 400 W - Peak transient energy absorption capability, derated linearly above 25°C ambient |
| IR @ VWM | <1 μA - Minimal leakage ensures negligible standby power loss and signal integrity in high-impedance rails |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and thermally constrained PCB layouts |
| MSL Level | Level 1 (per J-STD-020) - No floor life limitation; safe for standard reflow without baking |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads compliant with J-STD-002 solderability, polarity indicated by cathode band (unidirectional only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to source (e.g., battery or supply rail); conducts during reverse-biased transients |
| Cathode | Output side / ground reference | Connected toward load or GND; defines unidirectional clamping direction; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and body modules |
| Glass passivated junction | Ensures stable VBR over temperature and long-term reliability under repeated surge stress |
| Fast response time <1 ps | Clamps transients before propagation into sensitive ICs, critical for CAN/LIN bus and MCU power inputs |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) test requirements |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Body Control Module (BCM) | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12V/24V supply inputs of BCM microcontrollers and CAN transceivers against load-dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input, clamping transients before they reach low-voltage regulators. Use Value: Limits clamped voltage to 177V, preserving 36V-rated input capacitors and preventing regulator latch-up during 120V/200ms load-dump events. | Use Scenario: Safeguarding primary-side rectifier outputs in offline AC/DC adapters subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing 400W 10/1000μs pulses across bulk capacitor terminals. Use Value: Withstands ≥1000 surges at rated power per JEDEC standards, extending adapter field life in harsh electrical environments. |
| On-board DC/DC Converter | LED Driver Power Input |
Use Scenario: Input protection for 48V-to-12V buck converters in commercial vehicle lighting systems. IC Role / Device Role / Timing Role: Front-end TVS suppressing ISO 7637-2 Pulse 2b (battery disconnect transients) on converter VIN pin. Use Value: Sub-1ps response ensures clamping occurs before converter controller ICs experience overvoltage beyond absolute maximum ratings. | Use Scenario: Surge suppression on constant-current LED driver inputs exposed to ESD during handling and installation. IC Role / Device Role / Timing Role: Unidirectional clamp shunting transients away from driver IC's HV startup circuitry and gate drivers. Use Value: 177V VC ensures LED string FETs (rated 200V) remain within safe operating area during 8kV contact ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ110A | Same VWM/VBR/VC specs; non-AEC-Q101 qualified; MSL level not specified | Lacks automotive qualification; suitable for industrial/commercial only | Select when AEC-Q101 is not required and cost optimization is prioritized |
| SMBJ110AH | Same VWM/VBR/VC; higher 600W PPPM rating; SMB package (larger footprint) | Higher surge capacity but requires PCB layout change due to DO-214AA footprint | Choose when system-level surge testing exceeds 400W or thermal margin is constrained |
Compared with SMAJ110AH, SMAJ110A omits automotive qualification and moisture sensitivity assurance, while SMBJ110AH trades compact DO-214AC size for higher 600W surge rating in larger SMB package-making SMAJ110AH optimal for space-constrained AEC-Q101-compliant designs needing precise 400W protection.
Availability
SMAJ110AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial switching mode power supplies, and on-board DC/DC converters requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMAJ110AH 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 power devices, TVS diodes, and rectifiers since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing high-reliability glass-passivated junctions, tight VBR tolerances, and ISO 7637-2 Pulse validation across the full 5V–188V range.
FAQ
What is the clamping voltage of SMAJ110AH at its rated peak pulse current?
The SMAJ110AH has a maximum clamping voltage (VC) of 177 V at 1.7 A peak impulse current (IPPM), measured under the standardized 10/1000μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is guaranteed across the full operating temperature range per the official Taiwan Semiconductor datasheet revision A2102.
Is SMAJ110AH suitable for bidirectional transient protection?
No, SMAJ110AH is a unidirectional TVS diode, as confirmed by its part number suffix "AH" and explicit marking of cathode polarity. For bidirectional protection, Taiwan Semiconductor specifies CH or CAH suffix variants (e.g., SMAJ110CH). Using SMAJ110AH in reverse-biased configurations risks permanent failure due to lack of symmetrical avalanche structure.
Does SMAJ110AH meet automotive qualification standards?
Yes, SMAJ110AH is AEC-Q101 qualified per the manufacturer's documentation, making it suitable for automotive applications including engine control units, body electronics, and infotainment power supplies. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements and carries MSL Level 1 rating per J-STD-020 for lead-free reflow compatibility.
What is the maximum steady-state power dissipation for SMAJ110AH?
The SMAJ110AH has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient temperature, as specified in the Absolute Maximum Ratings table. This value applies to continuous DC or low-frequency reverse-bias conditions-not transient surges-and must be derated linearly above 25°C using the published thermal resistance curve (Fig.2) to avoid exceeding the 150°C maximum junction temperature.
How does SMAJ110AH differ from SMAJ110H?
SMAJ110AH features tighter breakdown voltage tolerance (122–135 V vs. 122–149 V for SMAJ110H) and lower clamping voltage (177 V vs. 196 V), resulting in improved protection margin for downstream components. Both share identical VWM (110 V), package (DO-214AC), and AEC-Q101 qualification-but SMAJ110AH delivers superior clamping consistency for precision-sensitive applications like MCU power rails.
SMAJ110AH 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:
- 177V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
SMAJ110AH FAQ
1.How can I place an order for SMAJ110AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ110AH 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 SMAJ110AH reliable?
The price and inventory of SMAJ110AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ110AH is usually 5 days.
3.What payment methods are accepted for SMAJ110AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ110AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ110AH?
SMAJ110AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ110AH 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 SMAJ110AH?
For technical support, including SMAJ110AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ110AH requirements.
6.How does Aetrix verify that SMAJ110AH is sourced from the original manufacturer or authorized distributors?
All SMAJ110AH 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 SMAJ110AH meets industry standards.
7.What is the process for return or replacement of SMAJ110AH?
All SMAJ110AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ110AH, 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 SMAJ110AH part is unused and in its original packaging.
Return procedure for SMAJ110AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ110AH Tags
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