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Alpha & Omega Semiconductor Inc. SMDJ100A
- Part No.:
- SMDJ100A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ100A.pdf
- Description:
- 1CH 100V UNIDIRECTIONAL 3000W SM
- Quantity:
- Payment:
- Shipping:
Inventory:8,863
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Product details
Overview
SMDJ100A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 100 V reverse standoff voltage (VRWM), 111–123 V breakdown voltage (VBR) at 1 mA, 162 V maximum clamping voltage (VC) at 18.6 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial motor drives and telecom power supplies.
For engineers reviewing the SMDJ100A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC VDD rating, thermal resistance (RθJL = 15 °C/W), unidirectional polarity confirmation, and DO-214AB package compatibility with 8.0 mm × 8.0 mm copper pad layout requirements.
Technical Context
The SMDJ100A operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to breakdown. Its unidirectional configuration uses a cathode band marking and requires correct anode-to-ground orientation in DC rail protection.
It is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance junction-to-lead of 15 °C/W when mounted on specified 8.0 mm × 8.0 mm copper pads - enabling reliable power derating up to 75 °C ambient before reaching TJ max = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 100 V - maximum continuous reverse voltage before leakage exceeds 2 µA; sets upper limit for protected line operating voltage. |
| VBR @ IT=1 mA | 111–123 V - guaranteed avalanche initiation range; ensures predictable turn-on during transients. |
| VC @ IPPM | 162 V - clamped voltage at 18.6 A peak pulse; determines worst-case overvoltage seen by downstream circuitry. |
| PPPM (10/1000 µs) | 3000 W - peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance with margin. |
| TJ max | +150 °C - maximum junction temperature; defines thermal design headroom for PCB copper area and airflow. |
| RθJL | 15 °C/W - junction-to-lead thermal resistance; enables accurate power derating using measured lead temperature. |
| Polarity | Unidirectional - cathode-banded device requiring correct orientation; not interchangeable with bidirectional SMDJ100CA without circuit redesign. |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case and matte tin lead-free plating. Cathode indicated by color band; terminals are solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; carries full surge current during clamping. |
| Cathode | High-side connection point | Connected to protected line (e.g., +100 V rail); marked by color band; voltage reference for breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - enables suppression before sensitive ICs experience overstress; critical for protecting high-speed interface receivers. |
| Glass passivated junction | Enhanced reliability and stable VBR over temperature and lifetime - reduces parameter drift in harsh environments. |
| Built-in strain relief | Reduces mechanical stress at lead-to-body interface during thermal cycling - improves long-term solder joint integrity. |
| MSL1 rating | Compatible with standard SMT reflow profiles up to 260 °C peak - eliminates pre-bake requirement and simplifies manufacturing. |
| UL 94V-0 flammability | Self-extinguishing plastic housing - meets safety standards for enclosed industrial and telecom equipment. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 100 V DC bus against load dump and inductive switching transients in servo amplifier modules. IC Role / Device Role: Primary overvoltage clamp placed across DC link capacitor bank. Use Value: Limits transient voltage to ≤162 V, preventing gate oxide rupture in 200 V-rated IGBT drivers and maintaining system uptime. | Use Scenario: Surge suppression on -48 V telecom rectifier output feeding base station backplane. IC Role / Device Role: Unidirectional TVS shunting positive-going surges while blocking normal negative rail operation. Use Value: Withstands 3000 W pulses without degradation, meeting Telcordia GR-1089-CORE Level 3 immunity requirements. |
| Renewable Energy Inverters | Railway Signaling Systems |
Use Scenario: DC input protection in solar string inverters exposed to lightning-induced surges on PV array wiring. IC Role / Device Role: First-line transient suppressor upstream of MPPT controller and isolation stage. Use Value: Clamps 10/1000 µs surges to 162 V with <1 ps latency, preserving measurement accuracy of ±0.5% shunt-based current sensing. | Use Scenario: Overvoltage hardening of 110 V DC control circuits in trackside signaling relays. IC Role / Device Role: Rail clamp on safety-critical command line interfacing with microcontroller GPIO. Use Value: UL 94V-0 housing and MSL1 reflow compatibility ensure compliance with EN 50121-3-2 EMC and EN 50155 environmental standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMDJ100CA | Bidirectional variant; symmetric VBR (111–123 V) in both polarities; same VRWM, VC, and PPPM ratings. | Required where AC-coupled or bipolar signal lines need protection (e.g., RS-485, CAN bus); not suitable for unidirectional DC rails without redesign. | Select SMDJ100CA only if bidirectional clamping is required; verify circuit polarity tolerance before substitution. |
| SAC100 | Same DO-214AB package; lower PPPM (1500 W); higher VC (170 V @ 17.6 A); tighter VBR tolerance (±5%). | Acceptable for lower-energy threats (IEC 61000-4-2 Level 3); insufficient for IEC 61000-4-5 Level 4 due to reduced power rating. | Use SAC100 only in cost-sensitive designs with verified lower surge exposure; confirm clamping margin remains >20% above protected IC absolute maximum rating. |
Compared with SMDJ100CA and SAC100, the SMDJ100A provides optimal balance of high 3000 W surge capacity, precise 100 V standoff, and unidirectional polarity for DC power rail protection - making it the preferred choice for industrial and telecom systems requiring robust, single-polarity clamping without layout changes.
Availability
SMDJ100A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, renewable energy inverters, and railway signaling systems requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ100A 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, industrial, and automotive markets.
The SMDJ series is engineered for high-power transient suppression in harsh environments, targeting applications demanding 3000 W surge capability, low clamping ratio, and industrial-grade thermal performance in compact DO-214AB packaging.
FAQ
What is the maximum clamping voltage of the SMDJ100A under peak pulse conditions?
The SMDJ100A has a maximum clamping voltage (VC) of 162 V at 18.6 A peak pulse current on a 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the highest voltage the protected circuit will experience during a standardized surge event. The SMDJ100A maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), ensuring consistent protection in demanding thermal environments.
Is the SMDJ100A suitable for bidirectional signal line protection?
No, the SMDJ100A is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. Its cathode-band marking and asymmetric conduction behavior mean it only clamps positive transients relative to ground. For bidirectional applications such as RS-485 or CAN bus, the SMDJ100CA - the bidirectional variant of the same family - must be used instead. Substituting SMDJ100A in a bidirectional circuit risks failure to suppress negative-going transients.
What is the thermal resistance specification for the SMDJ100A, and how does it impact PCB layout?
The SMDJ100A has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value directly informs PCB copper area requirements: reducing pad size increases thermal resistance, raising junction temperature under repeated surges. To maintain TJ ≤ 150 °C at full 3000 W rating, designers must adhere to the specified pad dimensions and consider additional thermal vias or ground plane connections for sustained duty cycles.
Does the SMDJ100A meet RoHS and halogen-free compliance standards?
Yes, the SMDJ100A is an AOS Green Product, fully compliant with RoHS directives and halogen-free requirements (Br & Cl < 900 ppm, total halogens < 1500 ppm). It uses matte tin lead-free plating and UL 94V-0 rated molding compound. Compliance documentation, including material declarations and test reports, is available through AOS' official product portal and is verified for use in industrial and telecom equipment subject to strict environmental regulations.
How does the SMDJ100A's response time affect its effectiveness in protecting fast digital interfaces?
The SMDJ100A responds in less than 1.0 ps from 0 V to breakdown, making it effective for suppressing very fast transients that could otherwise propagate into high-speed digital interfaces. However, its primary role is DC rail protection - not signal line clamping - due to its relatively high junction capacitance (~100 pF at 0 V). For protecting USB, HDMI, or Ethernet lines, dedicated low-capacitance TVS arrays (e.g., AOS's D1213 series) are recommended alongside the SMDJ100A's rail-level protection.
SMDJ100A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 18.6A
- Power - Peak Pulse:
- 3000W (3kW)
- 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-214AB
SMDJ100A FAQ
1.How can I place an order for SMDJ100A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ100A 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 SMDJ100A reliable?
The price and inventory of SMDJ100A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ100A is usually 5 days.
3.What payment methods are accepted for SMDJ100A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ100A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ100A?
SMDJ100A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ100A 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 SMDJ100A?
For technical support, including SMDJ100A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ100A requirements.
6.How does Aetrix verify that SMDJ100A is sourced from the original manufacturer or authorized distributors?
All SMDJ100A 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 SMDJ100A meets industry standards.
7.What is the process for return or replacement of SMDJ100A?
All SMDJ100A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ100A, 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 SMDJ100A part is unused and in its original packaging.
Return procedure for SMDJ100A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ100A Tags
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