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Taiwan Semiconductor Corporation SMAJ100A
- Part No.:
- SMAJ100A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100A.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,995
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Product details
Overview
SMAJ100A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 100 V working stand-off voltage (VWM), 111–123 V breakdown voltage (VBR) at 1 mA test current, 162 V maximum clamping voltage (VC) at 1.9 A peak impulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ100A datasheet, SMAJ100A pinout, SMAJ100A application, or SMAJ100A equivalent, this device is selected for high-reliability surge suppression in automotive-grade DC/DC converters, industrial SMPS inputs, lighting ballasts, and adapter front-end protection where fast response (<1 ps), low leakage (<1 µA @ 100 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The SMAJ100A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable breakdown behavior and low capacitance. Its clamping action begins at VBR min = 111 V and limits transient energy by diverting surge current away from sensitive downstream circuitry when voltage exceeds VWM = 100 V.
It sustains 400 W peak pulse power under standard 10/1000 µs waveform conditions (derated above 25°C per Fig.2), supports 40 A non-repetitive forward surge (IFSM), and maintains operation across -55°C to +150°C junction temperature range - enabling use in thermally demanding environments without derating penalties below 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin for 12 V–48 V systems with headroom. |
| VBR @ IT=1 mA | 111–123 V - Verified avalanche onset range; ensures predictable turn-on within 11% tolerance for consistent protection threshold. |
| VC @ IPPM | 162 V - Clamped voltage at 1.9 A peak impulse; limits downstream stress to <162 V during 10/1000 µs transients. |
| PPPM (10/1000 µs) | 400 W - Peak transient energy handling capacity; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (battery disconnect). |
| IR @ VWM | <1 µA - Ultra-low reverse leakage at rated stand-off; prevents measurable power loss or bias drift in high-impedance monitoring circuits. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass, UL 94V-0 molding, and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: single-ended, two-terminal construction with cathode band marking for unidirectional polarity. Cathode terminal connects to protected line; anode ties to ground or return path. Leads are coplanar, RoHS-compliant, and halogen-free per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection | Connected to input rail (e.g., 100 V DC bus); conducts during overvoltage to shunt surge current to ground. |
| Anode | Reference/return node | Tied to system ground or low-impedance return path; completes clamping loop and establishes reference for breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage over lifetime and temperature; eliminates parameter drift due to moisture or contamination ingress. |
| Fast response time <1.0 ps | Clamps transients before they propagate into ICs or MOSFETs - critical for protecting fast-switching gate drivers and microcontroller I/O. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive-level electrical disturbance immunity; suitable for 12 V/24 V vehicle subsystems without additional filtering. |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; compatible with standard SMT assembly lines without dry-pack or floor-life constraints. |
Applications
| Automotive DC/DC Converter Input | Industrial SMPS Front-End |
|---|---|
Use Scenario: Protection of 100 V-rated buck converter input against load dump and alternator surges in commercial vehicle electronics. IC Role / Device Role / Timing Role: Unidirectional TVS placed directly across input terminals to clamp transients before they reach controller IC and primary-side MOSFETs. Use Value: Limits peak voltage to ≤162 V during ISO 7637-2 Pulse 1 (−150 V, 50 ms), preventing gate oxide rupture and controller latch-up. | Use Scenario: Surge suppression on 100 V intermediate bus in factory automation PLC power modules exposed to relay switching noise. IC Role / Device Role / Timing Role: Standoff protector on DC input rail upstream of EMI filter and PFC stage; activated only during >100 V events. Use Value: Withstands 400 W pulses without degradation, maintaining <1 µA leakage to avoid false triggering of undervoltage lockout circuits. |
| LED Driver Ballast Protection | AC/DC Adapter Output Stage |
Use Scenario: Safeguarding constant-current LED driver ICs in outdoor streetlight systems subjected to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Secondary-side TVS on output rail to absorb coupled transients from AC mains or nearby lightning strikes. Use Value: Clamps 10/1000 µs surges to 162 V while adding negligible capacitance (<100 pF), preserving PWM dimming fidelity and thermal stability. | Use Scenario: Output overvoltage protection in universal-input 100 V DC adapters used in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Final-stage clamp after regulation to prevent damage to connected powered devices during regulator fault or feedback loop failure. Use Value: Provides fail-safe shutdown margin with 100 V VWM aligned to nominal output, ensuring no conduction during normal operation yet immediate response to >111 V faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100 | Higher clamping voltage (179 V vs. 162 V at same IPPM), wider VBR range (111–136 V), higher IR limit (5 µA vs. 1 µA @ VWM) | Less precise clamping margin; acceptable where downstream components tolerate up to 179 V transient exposure | Select SMAJ100A when tighter clamping control and lower leakage are required for sensitive analog or logic interfaces. |
| SMBJ100A | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating (vs. 400 W) | Requires more PCB area; preferred for higher-energy surge environments where 600 W margin is needed | Choose SMBJ100A only if system-level testing confirms need for >400 W pulse handling; otherwise SMAJ100A offers optimal size/power density. |
Compared with SMAJ100 and SMBJ100A, the SMAJ100A delivers the tightest clamping performance (162 V) and lowest leakage (≤1 µA) in the smallest DO-214AC footprint - making it ideal for space-constrained, high-precision DC rail protection where thermal and layout efficiency are prioritized.
Availability
SMAJ100A is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS front-ends, and LED driver ballast protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ100A 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, MOSFETs, and power management devices.
The SMAJ series was developed specifically for high-reliability, surface-mount transient suppression in automotive, industrial, and lighting applications - emphasizing fast response, low leakage, and international surge standard compliance.
FAQ
What is the maximum clamping voltage of the SMAJ100A under standard test conditions?
The SMAJ100A has a maximum clamping voltage (VC) of 162 V when subjected to its rated peak impulse current (IPPM) of 1.9 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that downstream circuitry will not experience voltages exceeding 162 V during defined transient events - a critical parameter for ensuring reliability in 100 V rail systems. The SMAJ100A achieves this with minimal voltage overshoot due to its optimized avalanche junction design.
Is the SMAJ100A suitable for bidirectional surge protection applications?
No, the SMAJ100A is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications - including breakdown voltage, clamping behavior, and leakage current - apply only in the reverse-biased direction. For bidirectional protection, Taiwan Semiconductor specifies parts with "CA" suffix (e.g., SMAJ100CA). Using SMAJ100A in bidirectional configurations may result in forward conduction during negative transients and inadequate protection.
Does the SMAJ100A meet automotive surge immunity standards?
Yes, the SMAJ100A meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering key automotive electrical disturbances such as load dump, battery disconnection, and inductive switching transients. Its 400 W peak pulse power rating, fast <1 ps response, and specified clamping performance at elevated temperatures make it appropriate for use in automotive body control modules, infotainment power supplies, and ADAS sensor interface protection circuits.
What is the operating temperature range for the SMAJ100A?
The SMAJ100A is rated for an operating junction temperature range of -55°C to +150°C, with steady-state power dissipation (PD) of 1 W at 25°C ambient. Derating follows the curve in Figure 2 of the datasheet, maintaining full 400 W pulse capability up to 25°C and linearly reducing above that point. This wide thermal range supports deployment in under-hood automotive locations, industrial motor drives, and outdoor lighting enclosures without thermal derating concerns at typical ambient conditions.
How does the SMAJ100A compare to the SMAJ100 in terms of leakage current and clamping performance?
The SMAJ100A exhibits significantly lower reverse leakage current - ≤1 µA at 100 V (VWM) versus ≤5 µA for SMAJ100 - and tighter clamping voltage: 162 V vs. 179 V at their respective IPPM values. These differences stem from tighter process control on the A-suffix variant, resulting in improved precision for applications where minimal standby power loss and strict voltage limiting are essential. Both share identical DO-214AC packaging and mounting compatibility.
SMAJ100A 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:
- 162V
- Current - Peak Pulse (10/1000µs):
- 1.9A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ100A FAQ
1.How can I place an order for SMAJ100A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100A 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 SMAJ100A reliable?
The price and inventory of SMAJ100A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100A is usually 5 days.
3.What payment methods are accepted for SMAJ100A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100A?
SMAJ100A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100A 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 SMAJ100A?
For technical support, including SMAJ100A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100A requirements.
6.How does Aetrix verify that SMAJ100A is sourced from the original manufacturer or authorized distributors?
All SMAJ100A 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 SMAJ100A meets industry standards.
7.What is the process for return or replacement of SMAJ100A?
All SMAJ100A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100A, 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 SMAJ100A part is unused and in its original packaging.
Return procedure for SMAJ100A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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