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Vishay General Semiconductor - Diodes Division SMAJ100AHE3_A/I
- Part No.:
- SMAJ100AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100AHE3_A/I.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,221
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Product details
Overview
SMAJ100AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 100 V 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 pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ100AHE3_A/I datasheet, SMAJ100AHE3_A/I pinout, SMAJ100AHE3_A/I application, or SMAJ100AHE3_A/I equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in automotive, industrial, and telecom systems where AEC-Q101 qualification, low clamping ratio, and fast response time are critical.
Technical Context
The SMAJ100AHE3_A/I operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low incremental surge resistance. Its clamping action begins at VBR ≥ 111 V and limits transient voltages to ≤ 162 V under 1.9 A 10/1000 μs surge, enabling reliable protection of downstream MOSFETs, ICs, and sensor interfaces.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, supporting operation up to TJ = +150 °C. The device is rated for 40 A non-repetitive forward surge current (IFSM) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin. |
| VBR (min/max) | 111 V / 123 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 162 V at IPPM = 1.9 A - Measured clamping voltage under standardized 10/1000 μs surge; determines protected circuit stress level. |
| PPPM | 400 W - Peak pulse power handling capability; supports high-energy transients without failure. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; negligible power loss and minimal impact on system quiescent current. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount footprint with 5.0 mm × 5.0 mm copper pad thermal design; compatible with automated placement. |
Pinout & Package
Package: SMA (DO-214AC), molded case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to lower-potential side (e.g., ground or negative rail); completes clamping loop during positive transients. |
| Cathode | Avalanche conduction terminal | Marked with band; connected to protected line (e.g., 100 V supply rail); conducts when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables suppression of high-energy transients common in automotive load-dump and industrial motor-switching events. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during clamping, reducing stress on protected ICs and MOSFETs. |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved resistance to moisture-induced degradation. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow processes without preconditioning or special handling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and body control modules from ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp negative-going spikes and positive load-dump surges. Use Value: Limits transient voltage to ≤ 162 V, preventing latch-up or gate oxide damage in microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) and digital I/O of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Standoff-rated TVS on signal line to ground, absorbing ESD and inductive kickback from nearby solenoid actuation. Use Value: Sub-μA leakage at 100 V ensures no measurable error in precision current-loop accuracy; fast response prevents sensor ADC saturation. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
|
Use Scenario: Front-end protection of PoE-powered switches and base station RF modules operating from 48 V DC supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input bulk capacitor rail, coordinated with upstream fuses and secondary filtering. Use Value: 400 W rating handles repeated lightning-induced surges per IEC 61000-4-5; 150 °C TJ rating supports sealed enclosure thermal profiles. |
Use Scenario: Overvoltage guard on 5 V/9 V/12 V DC input jacks of smart speakers, set-top boxes, and gaming peripherals exposed to user-handled adapters. IC Role / Device Role / Timing Role: First-line transient suppressor between jack center pin and system ground, sized to survive accidental AC adapter misconnection. Use Value: 100 V VWM provides margin above nominal 12 V inputs while maintaining low VC to avoid brownout of internal LDOs. |
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-E3/61 | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC specs, identical SMA package and pinout. | Lacks automotive qualification; suitable for industrial/commercial designs not requiring AEC-Q101 compliance. | Select when cost sensitivity outweighs automotive qualification requirements and lifecycle assurance is managed externally. |
| SMLJ100AHE3_A/I | Higher 1500 W PPPM rating, larger SMC (DO-214AB) package, same VWM/VBR/VC electrical characteristics. | Used where higher surge energy handling is required (e.g., primary-side AC/DC input), but requires PCB layout change. | Choose when system-level surge testing exceeds 400 W; accept larger footprint and higher thermal mass for enhanced ruggedness. |
Compared with SMAJ100AHE3_A/I, the SMAJ100A-E3/61 offers identical protection performance at lower cost but no automotive qualification, while the SMLJ100AHE3_A/I delivers 3.75× higher surge capacity in a physically larger package-requiring layout revision but enabling single-device compliance with harsher IEC 61000-4-5 Level 4 tests.
Availability
SMAJ100AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer DC-input devices requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ100AHE3_A/I 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, TVS devices, and MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure-delivering consistent clamping performance, AEC-Q101 validation, and robust thermal design in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMAJ100AHE3_A/I under a 10/1000 μs surge?
The SMAJ100AHE3_A/I has a maximum clamping voltage (VC) of 162 V when subjected to its rated peak pulse current of 1.9 A with a 10/1000 μs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ100AHE3_A/I maintains this clamping performance across its specified operating temperature range.
Is the SMAJ100AHE3_A/I suitable for automotive applications?
Yes, the SMAJ100AHE3_A/I is AEC-Q101 qualified, making it suitable for automotive applications including engine control units, body electronics, and infotainment power supplies. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity, and guaranteed operation from –55 °C to +150 °C-all validated per AEC-Q101 stress test requirements. The SMAJ100AHE3_A/I is explicitly designated for automotive use via its "HE3" suffix.
What does the "HE3" suffix indicate in SMAJ100AHE3_A/I?
The "HE3" suffix in SMAJ100AHE3_A/I denotes RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "E3") and halogen-free variants (e.g., "HM3"). The "A/I" portion specifies packaging: "A" indicates tape-and-reel format, and "I" denotes 7500-unit quantity on 13-inch reels. The SMAJ100AHE3_A/I thus combines automotive reliability, environmental compliance, and high-volume assembly readiness.
How does the SMAJ100AHE3_A/I compare to bidirectional TVS diodes like SMAJ100CA?
The SMAJ100AHE3_A/I is unidirectional and intended for DC circuits where polarity is fixed, offering lower leakage and tighter VBR tolerance than its bidirectional counterpart SMAJ100CA. The SMAJ100CA supports AC or floating signal lines but exhibits higher ID at VWM and symmetrical clamping in both directions. For 100 V DC rails, the SMAJ100AHE3_A/I provides superior leakage performance and is the preferred choice unless bidirectional protection is explicitly required.
What thermal derating applies to the SMAJ100AHE3_A/I above 25 °C ambient?
The SMAJ100AHE3_A/I must be derated linearly above TA = 25 °C per Figure 2 in its datasheet, with power dissipation (PD) decreasing from 3.3 W at 25 °C to zero at +150 °C junction temperature. Its thermal resistance is RθJA = 120 °C/W on standard 0.2" × 0.2" copper pads. For sustained operation near 100 °C ambient, board-level thermal design-including copper area and airflow-must ensure TJ remains ≤ 150 °C. The SMAJ100AHE3_A/I's RθJL = 30 °C/W also supports localized heatsinking via lead connections.
SMAJ100AHE3_A/I 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ100AHE3_A/I FAQ
1.How can I place an order for SMAJ100AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100AHE3_A/I 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 SMAJ100AHE3_A/I reliable?
The price and inventory of SMAJ100AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ100AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100AHE3_A/I?
SMAJ100AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100AHE3_A/I 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 SMAJ100AHE3_A/I?
For technical support, including SMAJ100AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ100AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ100AHE3_A/I 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 SMAJ100AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ100AHE3_A/I?
All SMAJ100AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100AHE3_A/I, 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 SMAJ100AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ100AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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