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Taiwan Semiconductor Corporation SMAJ100H
- Part No.:
- SMAJ100H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100H.pdf
- Description:
- TVS DIODE 100VWM 179VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,035
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Product details
Overview
SMAJ100H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 100V working stand-off voltage (VWM), 111–136V breakdown voltage (VBR), and 179V 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 SMAJ100H datasheet, SMAJ100H pinout, SMAJ100H application, or SMAJ100H equivalent, this device serves as a high-reliability, AEC-Q101 qualified surge protector for 12V/24V/48V automotive and industrial power rails where fast response (<1.0ps), low leakage (<1µA @ 100V), and stable clamping under 10/1000µs transients are critical selection criteria.
Technical Context
The SMAJ100H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response and stable breakdown behavior. Its clamping action begins at VBR min = 111V and limits transient energy to ≤179V at IPPM = 1.7A under standardized 10/1000µs waveform.
It supports continuous operation from –55°C to +150°C junction temperature, with steady-state power dissipation of 1W and peak pulse power of 400W (derated above 25°C ambient). Polarity is marked by cathode band; no internal series resistance or integrated thermal shutdown is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin for 100V nominal rail. |
| VBR @ IT=1mA | 111–136 V - Breakdown onset range; ensures reliable conduction onset above system overvoltage threshold. |
| VC @ IPPM | 179 V - Clamped voltage at 1.7A peak impulse; determines maximum stress imposed on downstream ICs during surge. |
| PPPM (10/1000µs) | 400 W - Peak pulse power handling; enables suppression of ISO 7637-2 Pulse 1 (inductive load dump) events. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive placement without derating. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline; compatible with automated pick-and-place and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts surge current to reference plane during reverse-biased clamping. |
| Cathode | Protected line connection | Connected to protected rail (e.g., 100V input); blocks normal operation but avalanches into conduction when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per JESD47. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift in harsh environments. |
| Fast response time | <1.0 ps from 0 V to VBR min - limits voltage overshoot before clamping engages, protecting sensitive gate drivers and controllers. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump), and Pulse 3a/3b (capacitive coupling) test requirements. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - suitable for green manufacturing and export-regulated applications. |
Applications
| Automotive DC/DC Converter Input Protection | Industrial SMPS Line Surge Suppression |
|---|---|
Use Scenario: Protecting 100V-input isolated DC/DC converters in vehicle infotainment or ADAS domain controllers from load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp ISO 7637-2 Pulse 2b events within 10/1000µs window. Use Value: Limits peak voltage to 179V, preventing damage to primary-side MOSFETs and controller ICs rated for ≤200V absolute maximum. | Use Scenario: Safeguarding 100V intermediate bus in factory automation PLC power supplies against lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor on AC-DC rectified output, absorbing repetitive 400W pulses without degradation. Use Value: Maintains <1µA leakage at 100V, avoiding unnecessary power loss while delivering consistent clamping across 10⁵+ surge cycles. |
| On-Board Charger (OBC) Auxiliary Rail Protection | LED Driver Input Transient Filtering |
Use Scenario: Securing 100V auxiliary supply feeding gate drivers and communication ICs in EV on-board chargers exposed to battery disconnect transients. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp on isolated 100V rail, coordinated with upstream fuse and downstream LC filter. Use Value: Responds in <1ps to limit overshoot below 180V, preserving signal integrity of CAN FD and isolated SPI interfaces. | Use Scenario: Shielding constant-current LED driver ICs from ESD and switching noise on 100V string inputs in streetlight systems. IC Role / Device Role / Timing Role: Primary-level TVS on high-voltage LED string input, placed ahead of bulk capacitor and current-sense resistor. Use Value: Delivers 179V clamping at 1.7A with <1µA leakage, enabling accurate current regulation and eliminating false fault triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100AH | Lower VBR range (111–123V vs. 111–136V); tighter tolerance; same VWM, VC, and PPPM. | Better suited for designs requiring tighter breakdown consistency across temperature and lot variation. | Select SMAJ100AH when VBR stability is prioritized over maximum clamping margin. |
| SMBJ100H | Same electrical specs but in larger DO-214AA (SMB) package; 600W PPPM rating (vs. 400W). | Higher power handling allows longer surge duration or higher repetition rates; requires larger PCB footprint. | Choose SMBJ100H when system-level testing reveals marginal margin with 400W clamping energy. |
Compared with SMAJ100AH, the SMAJ100H offers wider VBR tolerance for cost-sensitive automotive modules; versus SMBJ100H, it trades 200W peak power for 30% smaller board area-ideal for space-constrained OBC and DC/DC converter layouts.
Availability
SMAJ100H is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS units, and on-board charger auxiliary rail protection requiring stable component supply across extended temperature ranges and AEC-Q101-compliant sourcing.
Supply support for SMAJ100H 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, serving automotive, industrial, and consumer markets since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in 12V–188V automotive power networks, emphasizing robustness, tight parametric control, and compatibility with automated SMT assembly lines.
FAQ
What is the maximum clamping voltage of the SMAJ100H under standard test conditions?
The SMAJ100H has a maximum clamping voltage (VC) of 179 V when subjected to a 10/1000 µs waveform at its rated peak impulse current of 1.7 A. This value is measured per JEDEC standards and reflects worst-case clamping performance across temperature and process variation. The SMAJ100H maintains this clamping level consistently due to its glass-passivated junction and AEC-Q101-qualified construction.
Is the SMAJ100H suitable for bidirectional transient suppression?
No, the SMAJ100H is a unidirectional TVS diode intended for suppression of positive-going transients on grounded-rail configurations. For bidirectional protection, Taiwan Semiconductor specifies devices with CH or CAH suffixes (e.g., SMAJ100CH). Using SMAJ100H in bidirectional applications risks forward conduction during negative excursions and may lead to failure. Always verify polarity marking and circuit topology before deploying SMAJ100H.
Does the SMAJ100H meet automotive qualification standards?
Yes, the SMAJ100H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. It also complies with J-STD-020 moisture sensitivity level 1, JESD201 Class 2 whisker resistance, and RoHS/halogen-free directives-making it suitable for under-hood and cabin-mounted automotive electronics where reliability and environmental resilience are mandatory.
What is the reverse leakage current specification for the SMAJ100H at its working voltage?
The SMAJ100H exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its full working stand-off voltage of 100 V. This low leakage ensures minimal power loss in always-on systems and prevents unintended loading of high-impedance sensing nodes. The specification is guaranteed across the full operating temperature range (–55°C to +150°C) and verified per AEC-Q101 stress testing protocols.
Can the SMAJ100H be used in place of SMAJ100AH in an existing design?
The SMAJ100H and SMAJ100AH share identical VWM (100 V), VC (179 V), and PPPM (400 W), but differ in VBR range: SMAJ100H is 111–136 V, while SMAJ100AH is 111–123 V. Substituting SMAJ100H may result in earlier clamping onset in some conditions, potentially increasing stress on upstream fuses or filters. Review system-level surge testing data before interchange; SMAJ100H is not a drop-in replacement unless VBR spread is acceptable in your application.
SMAJ100H 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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 179V
- 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)
SMAJ100H FAQ
1.How can I place an order for SMAJ100H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100H 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 SMAJ100H reliable?
The price and inventory of SMAJ100H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100H is usually 5 days.
3.What payment methods are accepted for SMAJ100H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100H?
SMAJ100H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100H 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 SMAJ100H?
For technical support, including SMAJ100H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100H requirements.
6.How does Aetrix verify that SMAJ100H is sourced from the original manufacturer or authorized distributors?
All SMAJ100H 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 SMAJ100H meets industry standards.
7.What is the process for return or replacement of SMAJ100H?
All SMAJ100H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100H, 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 SMAJ100H part is unused and in its original packaging.
Return procedure for SMAJ100H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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