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Vishay General Semiconductor - Diodes Division SMAJ11AHE3/5A
- Part No.:
- SMAJ11AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11AHE3/5A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,927
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Product details
Overview
SMAJ11AHE3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 11 V standoff voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 18.2 V maximum clamping voltage (VC) at 22 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ11AHE3/5A datasheet, SMAJ11AHE3/5A pinout, SMAJ11AHE3/5A application, or SMAJ11AHE3/5A equivalent, this device delivers AEC-Q101 qualified surge immunity, low incremental surge resistance, and fast sub-nanosecond response time - critical when selecting TVS diodes for CAN bus protection, DC-DC converter input filtering, or I/O line hardening against ESD and load dump transients.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 μA leakage at 11 V), then rapidly avalanches below 13.5 V to clamp transient energy into ground. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability across -55 °C to +150 °C operating range.
Designed for surface-mount automated assembly, SMAJ11AHE3/5A uses an SMA (DO-214AC) package with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102, meeting MSL Level 1 and UL 94 V-0 flammability requirements - enabling use in high-reliability automotive modules where thermal cycling and solder joint integrity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 11 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 12 V nominal systems |
| VBR (Breakdown Voltage) | 12.2–13.5 V at 1 mA - precise avalanche onset threshold ensuring predictable clamping behavior |
| VC (Clamping Voltage) | 18.2 V at 22 A IPPM - limits downstream voltage stress during 10/1000 μs transients, protecting 20 V-rated ICs |
| PPPM (Peak Pulse Power) | 400 W - sustains 10/1000 μs surges without degradation; derates to 300 W above 78 V |
| IPPM (Peak Pulse Current) | 22 A - maximum non-repetitive surge current capability under standardized waveform |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and enclosed industrial enclosures |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected circuit node (e.g., 12 V rail or signal line); conducts during forward surge only |
| Cathode | Ground-reference terminal | Marked by band; ties to system ground or low-impedance return path to enable clamping action |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per JESD22 standards |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3a/b (ESD-like transients) without failure |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage overshoot during clamping - critical for protecting low-voltage logic and analog front-ends |
| Fast response time (<1 ns) | Activates before most semiconductor damage thresholds are exceeded, preserving MOSFET gates and MCU I/O pins |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking; compatible with high-volume SMT production lines |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) and body control modules (BCMs) against load dump (ISO 16750-2) and jump-start transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between battery rail and DC-DC converter input. Use Value: Clamps 35 V/100 ms load dump events to ≤18.2 V, preventing overvoltage shutdown or latch-up in downstream PMICs. |
Use Scenario: Hardening analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across signal and return paths near connector interface. Use Value: Limits induced lightning-induced surges (IEC 61000-4-5) to <20 V, maintaining sensor accuracy and avoiding ADC saturation. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Filtering |
Use Scenario: Supplemental ESD protection on VBUS line of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Secondary clamping device downstream of primary polymer PTC and upstream of USB controller's internal diodes. Use Value: Absorbs ±15 kV contact discharge (IEC 61000-4-2) with <1 ns response, reducing stress on integrated PHY ESD structures. |
Use Scenario: Surge suppression on -48 V DC telecom power feeds entering base station remote radio units (RRUs). IC Role / Device Role / Timing Role: Unidirectional TVS connected between -48 V rail and chassis ground to divert common-mode transients. Use Value: Withstands repeated 10/1000 μs surges up to 22 A while maintaining <1 μA leakage at rated -48 V, ensuring minimal standby loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-E3/5A | Commercial-grade version; lacks AEC-Q101 qualification and automotive traceability | Approved for industrial/commercial designs but not automotive OEM or Tier-1 programs | Select when cost sensitivity outweighs automotive qualification requirements |
| SMAJ11CAHE3/5A | Bidirectional variant with same VWM (11 V) and VC (18.2 V), symmetric clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN FD) | Choose for bidirectional protection needs; note higher ID leakage at VWM due to dual-junction structure |
Compared with SMAJ11AHE3/5A, the SMAJ11A-E3/5A offers identical electrical specs but no automotive qualification, while SMAJ11CAHE3/5A provides symmetrical clamping essential for differential buses - making the original part optimal for cost-sensitive, unidirectional 12 V rail protection in AEC-Q101-compliant systems.
Availability
SMAJ11AHE3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power input stages requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMAJ11AHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and load dump is non-negotiable.
FAQ
What is the clamping voltage of SMAJ11AHE3/5A at its rated peak pulse current?
The SMAJ11AHE3/5A has a maximum clamping voltage (VC) of 18.2 V at 22 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value ensures that downstream components exposed to transients see no more than 18.2 V, making SMAJ11AHE3/5A suitable for safeguarding 20 V tolerant circuits in automotive and industrial systems.
Is SMAJ11AHE3/5A qualified for automotive applications?
Yes, SMAJ11AHE3/5A is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88390. This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock - validating SMAJ11AHE3/5A for use in engine compartments, ADAS modules, and other automotive subsystems requiring certified reliability.
How does the standoff voltage (VWM) of SMAJ11AHE3/5A relate to typical 12 V automotive systems?
The 11 V standoff voltage (VWM) of SMAJ11AHE3/5A is intentionally set below nominal 12 V system voltage to provide margin against ripple and tolerance drift while remaining above maximum steady-state battery voltage (typically ≤14.4 V). This ensures SMAJ11AHE3/5A remains non-conductive during normal operation yet activates promptly during transients exceeding 12.2 V, balancing protection and system compatibility.
What package type does SMAJ11AHE3/5A use, and why is it suitable for automated assembly?
SMAJ11AHE3/5A uses the SMA (DO-214AC) surface-mount package - a compact, low-profile outline with defined lead geometry and matte tin plating compliant to J-STD-002. Its standardized footprint and MSL Level 1 rating allow direct placement via pick-and-place machines and standard reflow profiles without pre-baking, supporting high-yield manufacturing of automotive and industrial PCBs.
Can SMAJ11AHE3/5A be used for bidirectional transient protection?
No - SMAJ11AHE3/5A is a unidirectional TVS diode, with polarity marked by a cathode band and functional only in reverse-biased mode. For bidirectional protection, the SMAJ11CAHE3/5A variant must be selected. Using SMAJ11AHE3/5A on AC or floating lines risks forward conduction and failure; always verify polarity alignment in schematic and layout for SMAJ11AHE3/5A.
SMAJ11AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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)
SMAJ11AHE3/5A FAQ
1.How can I place an order for SMAJ11AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11AHE3/5A 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 SMAJ11AHE3/5A reliable?
The price and inventory of SMAJ11AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ11AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11AHE3/5A?
SMAJ11AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11AHE3/5A 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 SMAJ11AHE3/5A?
For technical support, including SMAJ11AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11AHE3/5A requirements.
6.How does Aetrix verify that SMAJ11AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ11AHE3/5A 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 SMAJ11AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ11AHE3/5A?
All SMAJ11AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11AHE3/5A, 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 SMAJ11AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ11AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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