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Vishay General Semiconductor - Diodes Division SMAJ11AHE3/61
- Part No.:
- SMAJ11AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11AHE3/61.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,204
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Product details
Overview
SMAJ11AHE3/61 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 stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤18.2 V at 22 A peak pulse current (IPPM) under 10/1000 μs waveform. It delivers 400 W peak pulse power and is AEC-Q101 qualified for automotive-grade reliability in power rail and signal line protection.
For engineers reviewing the SMAJ11AHE3/61 datasheet, SMAJ11AHE3/61 pinout, SMAJ11AHE3/61 application, or SMAJ11AHE3/61 equivalent, this device is selected for its low clamping voltage, fast response time (<1 ps), and compatibility with automated SMT assembly on PCBs requiring IEC 61000-4-2/4-4/4-5 compliant surge immunity in automotive ECUs and industrial sensor interfaces.
Technical Context
The SMAJ11AHE3/61 operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds VBR, diverting surge energy away from protected circuitry. Its unidirectional polarity-marked by a cathode band-enables integration into DC-biased lines without forward conduction during normal operation.
It meets MSL Level 1 per J-STD-020 (reflow peak 260 °C), uses glass-passivated junction technology for stable leakage performance, and exhibits a temperature coefficient of VBR of +0.080 %/°C-enabling predictable clamping behavior across –55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 11 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 12.2–13.5 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering within specified tolerance. |
| VC (Clamping Voltage) | ≤18.2 V at 22 A (10/1000 μs) - Peak voltage seen by protected IC during surge; critical for MOSFET gate or MCU I/O survivability. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capability under standard 10/1000 μs waveform; supports repetitive surges at 0.01% duty cycle. |
| IPPM (Peak Pulse Current) | 22 A - Maximum non-repetitive surge current it can shunt without failure; validated with derating above 25 °C ambient. |
| ID (Max Reverse Leakage) | 1.0 μA at 11 V - Ultra-low leakage preserves power integrity in battery-backed or low-quiescent systems. |
| TJmax | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., 12 V rail); conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return plane; completes current path during clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensors-ensures long-term reliability under thermal cycling and vibration. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surge testing without degradation. |
| Low clamping ratio (VC/VWM ≈ 1.65) | Minimizes stress on downstream components-e.g., keeps 3.3 V or 5 V logic I/O below absolute maximum ratings during transients. |
| MSL Level 1 reflow compatibility | Enables single-pass lead-free reflow (peak 260 °C) without popcorn effect or bond wire damage-ideal for high-yield SMT production. |
| Glass-passivated junction | Provides stable leakage current and breakdown voltage over lifetime, resisting humidity-induced parameter drift in harsh environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of automotive body control modules (BCM) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDO or DC-DC regulator. Use Value: Limits voltage excursion to ≤18.2 V during 100 V/50 ms load dump events, preventing regulator latch-up or MOSFET gate oxide rupture. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure or temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS mounted at sensor connector interface to absorb ESD (±15 kV contact) and fast transients induced by nearby motor switching. Use Value: Clamps 8 kV ESD pulses to <18.2 V in <1 ps, preserving 16-bit ADC accuracy and avoiding microcontroller reset due to coupling. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
|
Use Scenario: Adding secondary-level ESD protection on VBUS line of USB 2.0 ports in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse and upstream of USB switch IC to handle repeated ±8 kV HBM discharges. Use Value: Maintains <1 μA leakage at 5 V, avoiding false disconnect detection while surviving >1000 ESD strikes without parametric shift. |
Use Scenario: Protecting -48 V DC input of telecom base station power supplies from lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Unidirectional TVS configured with cathode to -48 V rail and anode to chassis ground to clamp negative-going transients. Use Value: Withstands 400 W surges up to 22 A, enabling coordination with upstream GDTs and ensuring no failure during Telcordia GR-1089 Class B events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-E3/61 | Commercial-grade version; same electrical specs but not AEC-Q101 qualified. | Lacks automotive qualification-suitable for industrial or consumer designs where qualification is not mandated. | Select SMAJ11AHE3/61 when automotive compliance (e.g., ISO/TS 16949 traceability, extended temp validation) is required. |
| SMBJ11AHE3/61 | Same VWM/VC but higher PPPM = 600 W; larger SMB (DO-214AA) package (4.58 × 3.94 mm vs. SMA's 4.58 × 2.92 mm). | Offers greater surge margin but requires larger PCB footprint and may not fit space-constrained automotive modules. | Choose SMBJ11AHE3/61 only if design must survive >400 W surges (e.g., heavy-duty industrial motor drives) and layout allows larger case. |
Compared with SMAJ11A-E3/61, the SMAJ11AHE3/61 adds AEC-Q101 qualification without sacrificing electrical performance; compared with SMBJ11AHE3/61, it trades 200 W pulse power for 35% smaller footprint-making it optimal for compact, automotive-qualified 12 V rail protection.
Availability
SMAJ11AHE3/61 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 SMAJ11AHE3/61 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, precision, and automotive-grade qualification.
The SMAJ series was engineered specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure-balancing low clamping voltage, compact size, and AEC-Q101 compliance in surface-mount form.
FAQ
What is the clamping voltage of the SMAJ11AHE3/61 under standard surge conditions?
The SMAJ11AHE3/61 has a maximum clamping voltage (VC) of 18.2 V at 22 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC standards and reflects the actual voltage imposed on protected circuitry during surge events-critical for ensuring downstream components like microcontrollers or MOSFETs remain within their absolute maximum ratings. The SMAJ11AHE3/61 maintains this clamping performance across its full operating temperature range.
Is the SMAJ11AHE3/61 suitable for automotive applications?
Yes, the SMAJ11AHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It undergoes rigorous stress testing-including temperature cycling, humidity bias, and mechanical shock-to ensure reliability in engine compartments, infotainment systems, and ADAS modules. Its -55 °C to +150 °C operating range and MSL Level 1 reflow compatibility make the SMAJ11AHE3/61 appropriate for production-grade automotive electronics.
How does the SMAJ11AHE3/61 differ from the commercial-grade SMAJ11A-E3/61?
The SMAJ11AHE3/61 and SMAJ11A-E3/61 share identical electrical characteristics (VWM, VBR, VC, PPPM) and package (SMA), but only the HE3 variant is AEC-Q101 qualified. The HE3 version includes additional process controls, lot-level traceability, and extended environmental testing required for automotive deployment. For non-automotive applications where qualification is unnecessary, the SMAJ11A-E3/61 offers cost and lead-time advantages-while the SMAJ11AHE3/61 remains mandatory for Tier 1 automotive BOMs.
What is the maximum reverse leakage current for the SMAJ11AHE3/61 at rated standoff voltage?
The SMAJ11AHE3/61 specifies a maximum reverse leakage current (ID) of 1.0 μA at its 11 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss in always-on circuits such as battery-backed real-time clocks or low-power sensor nodes. Leakage remains below 5 μA up to +125 °C, supporting stable operation in thermally demanding environments without compromising system quiescent current budgets.
Can the SMAJ11AHE3/61 be used in bidirectional configurations?
No-the SMAJ11AHE3/61 is a unidirectional TVS diode, identified by its cathode band marking and specified breakdown only in reverse bias. Bidirectional protection requires a part with "CA" suffix (e.g., SMAJ11CA). Using the SMAJ11AHE3/61 in AC or floating signal paths would result in forward conduction during positive half-cycles, potentially damaging the device or distorting signals. Always match polarity: SMAJ11AHE3/61 for DC rails with defined ground reference; SMAJ11CAHE3/61 for symmetrical data lines like RS-485 or CAN.
SMAJ11AHE3/61 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)
SMAJ11AHE3/61 FAQ
1.How can I place an order for SMAJ11AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11AHE3/61 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 SMAJ11AHE3/61 reliable?
The price and inventory of SMAJ11AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ11AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11AHE3/61?
SMAJ11AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11AHE3/61 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 SMAJ11AHE3/61?
For technical support, including SMAJ11AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11AHE3/61 requirements.
6.How does Aetrix verify that SMAJ11AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ11AHE3/61 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 SMAJ11AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ11AHE3/61?
All SMAJ11AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11AHE3/61, 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 SMAJ11AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ11AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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