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Vishay General Semiconductor - Diodes Division SMAJ100A-E3/5A
- Part No.:
- SMAJ100A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100A-E3/5A.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ100A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 100 V stand-off voltage (VWM), 111–123 V breakdown voltage (VBR) at 1 mA, 162 V maximum clamping voltage (VC) at 1.9 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in industrial and automotive systems.
For engineers reviewing the SMAJ100A-E3/5A datasheet, SMAJ100A-E3/5A pinout, SMAJ100A-E3/5A application, or SMAJ100A-E3/5A equivalent, key selection criteria include clamping voltage margin relative to protected device VDS/VDD ratings, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping overvoltage protection device, leveraging an avalanche breakdown mechanism to divert transient energy away from downstream circuitry. Its unidirectional configuration requires cathode-band orientation toward the protected line's positive rail, and it exhibits low incremental surge resistance for effective energy absorption during 10/1000 μs surges.
The device is rated for repetitive operation at ≤0.01% duty cycle up to 400 W below 78 V and 300 W above - confirmed for SMAJ100A-E3/5A per derating curve Fig. 2. Junction temperature range spans −55 °C to +150 °C, with MSL Level 1 moisture sensitivity and J-STD-002/JESD 22-B102 solderability compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 111 V / 123 V at 1 mA - guaranteed avalanche initiation window; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 162 V at 1.9 A - clamped voltage during full-rated 10/1000 μs transient; defines worst-case stress on protected IC or MOSFET drain. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; determines survivability against lightning-induced or inductive-switching surges. |
| ID @ VWM | 1.0 μA - reverse leakage at stand-off voltage; negligible loading on 100 V bias rails in standby or low-power modes. |
| RθJA | 120 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating requirements above 25 °C ambient. |
| Polarity | Unidirectional - cathode band denotes terminal connected to system ground or lower-potential rail; not suitable for AC or bidirectional line protection. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-020 MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 100 V supply rail); conducts surge current to ground when VLINE exceeds VBR. |
| Anode | Reference node | Connected to system ground or lowest potential reference; completes conduction path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3/4 surges without external heat sinking on standard PCB pads. |
| 162 V clamping voltage at 1.9 A | Provides ≥38% margin above 100 V VWM, ensuring safe operation for 120 V nominal systems with tolerance and ripple. |
| Glass passivated chip junction | Improves long-term reliability and stability of VBR under thermal cycling and humidity exposure versus epoxy-passivated alternatives. |
| RoHS-compliant, matte tin plating | Ensures solder joint integrity and intermetallic formation control per J-STD-002, supporting lead-free reflow profiles. |
| MSL Level 1 rating | Allows unlimited floor life and direct placement without baking, reducing manufacturing overhead in high-volume SMT lines. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between 12–24 V supply rail and ground, triggered only during positive overvoltage events. Use Value: Limits transient voltage to ≤162 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces powered from the same rail. |
Use Scenario: Safeguarding LIN bus transceivers and sensor analog front-ends from load dump and jump-start transients. IC Role / Device Role / Timing Role: Standby protection element mounted directly at connector entry point, conducting within <1 ps of overvoltage onset. Use Value: Withstands 400 W pulses while maintaining sub-μA leakage at 12 V nominal, preserving battery drain budgets in always-on modules. |
| Telecom Power Supply Inputs | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage surge suppression for 48 V DC-DC converters in base station power distribution units. IC Role / Device Role / Timing Role: Primary clamping device parallel to bulk input capacitor, absorbing energy before reaching upstream regulator ICs. Use Value: 120 °C/W RθJA enables thermal design with minimal copper area, fitting compact 48 V telecom rectifier footprints. |
Use Scenario: Overvoltage guard for microcontroller reset lines and EEPROM programming pins exposed to ESD during service access. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) shunt protector tied between 3.3 V rail and ground, active only during >111 V excursions. Use Value: Prevents false resets or memory corruption during 8 kV contact ESD events without affecting normal 3.3 V logic timing or voltage regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and clamping performance. | No functional difference; selected where halogen-free BOM compliance is mandated by OEM or regional environmental regulations. | Choose SMAJ100A-M3/5A when halogen-free material declaration is required; otherwise SMAJ100A-E3/5A satisfies standard commercial-grade needs. |
| SMAJ100AHE3_A/I | AEC-Q101 qualified version; same VWM/VBR/VC/PPPM but validated for automotive temperature cycling, vibration, and lifetime reliability. | Required for under-hood or safety-critical automotive ECUs; not necessary for industrial or consumer applications outside automotive qualification scope. | Select SMAJ100AHE3_A/I only when AEC-Q101 certification is contractually or functionally required; SMAJ100A-E3/5A suffices for non-automotive use cases. |
Compared with SMAJ100A-M3/5A, SMAJ100A-E3/5A offers identical protection performance with standard RoHS compliance, while SMAJ100AHE3_A/I adds automotive qualification at higher cost and longer lead time - making SMAJ100A-E3/5A the optimal balance of cost, availability, and specification for commercial and industrial designs.
Availability
SMAJ100A-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply, consistent RoHS compliance, and SMT-ready packaging in 13" tape-and-reel format (7500 pcs/reel).
Supply support for SMAJ100A-E3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial, and telecom infrastructure where robustness against inductive switching and lightning surges is critical.
FAQ
What is the maximum clamping voltage of SMAJ100A-E3/5A under rated surge conditions?
The SMAJ100A-E3/5A exhibits a maximum clamping voltage (VC) of 162 V when subjected to its rated peak pulse current of 1.9 A using the standard 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must ensure downstream components have sufficient voltage margin above this 162 V clamping level to avoid damage or malfunction.
Is SMAJ100A-E3/5A suitable for bidirectional signal line protection?
No, SMAJ100A-E3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only when the anode is negative relative to the cathode - making it appropriate for DC power rail protection but unsuitable for AC or bidirectional data lines like RS-485 or CAN. For such applications, the bidirectional variant SMAJ100CA must be used instead, as explicitly defined in the Vishay SMAJ family documentation.
What is the thermal resistance and how does it affect PCB layout for SMAJ100A-E3/5A?
The SMAJ100A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional copper pour or thermal vias; adding thermal relief or stitching vias can reduce RθJA. At full 400 W pulse rating, even brief events raise junction temperature significantly - so layout must prioritize thermal mass and minimize trace impedance to ground to sustain repeated surges without exceeding 150 °C TJ max.
Does SMAJ100A-E3/5A meet automotive qualification standards?
The SMAJ100A-E3/5A is a commercial-grade, RoHS-compliant part and is not AEC-Q101 qualified. Vishay offers the automotive-qualified variant SMAJ100AHE3_A/I for applications requiring automotive reliability validation. The "HE3" suffix denotes AEC-Q101 qualification, while "E3" alone - as in SMAJ100A-E3/5A - indicates standard commercial grade. Always verify qualification status via the full ordering code before deploying in automotive ECUs.
What is the reverse leakage current of SMAJ100A-E3/5A at its stand-off voltage?
The SMAJ100A-E3/5A specifies a maximum reverse leakage current (ID) of 1.0 μA at its 100 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures negligible power loss and no measurable loading on 100 V bias rails during normal operation. Leakage remains well below 10 μA across the full −55 °C to +125 °C operating range, supporting stable performance in wide-temperature industrial deployments.
SMAJ100A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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:
- 300W
- 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-E3/5A FAQ
1.How can I place an order for SMAJ100A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100A-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ100A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ100A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100A-E3/5A?
SMAJ100A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100A-E3/5A 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-E3/5A?
For technical support, including SMAJ100A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100A-E3/5A requirements.
6.How does Aetrix verify that SMAJ100A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ100A-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ100A-E3/5A?
All SMAJ100A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100A-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ100A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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