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Vishay General Semiconductor - Diodes Division SMAJ11A-M3/61
- Part No.:
- SMAJ11A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11A-M3/61.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ11A-M3/61 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 11 V stand-off 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.
For engineers reviewing the SMAJ11A-M3/61 datasheet, SMAJ11A-M3/61 pinout, SMAJ11A-M3/61 application, or SMAJ11A-M3/61 equivalent, key selection considerations include its unidirectional polarity, 1.0 μA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature range, and halogen-free, RoHS-compliant M3 suffix construction suitable for automotive-grade designs when paired with AEC-Q101 qualified variants.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only during overvoltage events above its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics, while low incremental surge resistance enables effective energy diversion without significant voltage overshoot.
The SMAJ11A-M3/61 delivers fast response time (<1 ps), meets MSL level 1 per J-STD-020, and supports automated placement due to its low-profile SMA package. It is rated for 40 A non-repetitive forward surge current (IFSM) and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR min/max | 12.2 V / 13.5 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on within specification across process variation. |
| VC @ IPPM | 18.2 V at 22 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 400 W - Peak pulse power handling capability under standardized transient waveform; validates protection robustness for common surge events. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports protection of power rails subject to motor or relay switching transients. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial environments with minimal derating. |
| Leakage ID | 1.0 μA max at VWM - Low standby current minimizes power loss and avoids false triggering in high-impedance signal lines. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to ground or lower-potential rail; forms cathode-to-anode path during reverse-biased clamping event. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 12 V supply or signal trace); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Validates protection against IEC 61000-4-5 Level 3/4 surges on power and signal lines without thermal runaway. |
| Glass passivated chip junction | Ensures consistent avalanche behavior, long-term reliability, and immunity to moisture-induced degradation in humid environments. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without popcorn effect or delamination risk. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for consumer, industrial, and automotive end equipment without compromising performance. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving protection margin for sub-20 V logic and analog circuits. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs, body control modules, and lighting drivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and chassis ground to shunt transients exceeding 13.5 V. Use Value: Limits rail voltage to ≤18.2 V during 22 A surges, preventing damage to 20 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital sensor interfaces (CAN, LIN) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Parallel-connected TVS on signal line with cathode to signal and anode to ground, responding within picoseconds. Use Value: Clamps ESD pulses to <18.2 V while maintaining <1.0 μA leakage-preserving signal integrity and ADC reference accuracy. |
| Consumer Power Adapter Input Protection | Telecom Equipment Surge Suppression |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters and USB PD chargers exposed to mains-borne transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on regulated 5 V/9 V/12 V output rails to absorb coupling from primary-side switching noise. Use Value: Withstands repetitive 400 W surges without parameter shift, enabling compliance with UL 497B and IEC 62368-1 insulation coordination. |
Use Scenario: Front-end protection of Ethernet PHYs, DSL line drivers, and base station RF front-ends against lightning-induced surges on copper lines. IC Role / Device Role / Timing Role: First-stage clamping element in multi-stage protection network, limiting voltage before gas discharge tube or MOV stages. Use Value: Fast response and low clamping voltage reduce stress on downstream silicon, extending lifetime of high-speed transceivers and clock buffers. |
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-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3). | Preferred for commercial-grade applications where halogen-free requirement is not mandated. | Select SMAJ11A-E3/61 for cost-sensitive, non-automotive designs requiring standard RoHS compliance. |
| SMAJ11AHM3_A/H | AEC-Q101 qualified; identical electrical specs and M3 halogen-free construction, with automotive qualification suffix. | Required for automotive OEM and Tier-1 applications demanding qualification evidence and extended temperature validation. | Choose SMAJ11AHM3_A/H when automotive qualification documentation, PPAP support, and guaranteed lifecycle continuity are mandatory. |
Compared with SMAJ11A-M3/61, the E3 variant offers identical protection performance at lower cost for non-automotive use, while the HM3_A/H version adds formal AEC-Q101 qualification-enabling drop-in use in qualified automotive BOMs without revalidation.
Availability
SMAJ11A-M3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer adapter secondary-side surge suppression requiring stable component supply and halogen-free compliance.
Supply support for SMAJ11A-M3/61 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping performance and qualification-grade construction.
FAQ
What is the clamping voltage of the SMAJ11A-M3/61 under a 10/1000 μs surge?
The SMAJ11A-M3/61 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 is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ11A-M3/61 maintains this clamping performance across its full operating temperature range and after repeated surges within its rated duty cycle.
Is the SMAJ11A-M3/61 suitable for automotive applications?
The SMAJ11A-M3/61 itself is not AEC-Q101 qualified, but it shares identical electrical and mechanical specifications with the AEC-Q101-qualified SMAJ11AHM3_A/H variant. Its halogen-free (M3) and RoHS-compliant construction meets automotive material requirements, and its -55 °C to +150 °C operating range supports under-hood deployment. For certified automotive use, specify SMAJ11AHM3_A/H; the SMAJ11A-M3/61 serves as a commercial-grade alternative where qualification is not required.
How does the SMAJ11A-M3/61 differ from bidirectional TVS diodes like SMAJ11CA?
The SMAJ11A-M3/61 is unidirectional and features a cathode band marking, allowing it to conduct only in reverse bias-ideal for DC power rail protection. In contrast, SMAJ11CA is bidirectional with no polarity marking and symmetrical clamping in both directions, suited for AC lines or differential signal pairs. The SMAJ11A-M3/61 offers lower leakage (<1.0 μA) than SMAJ11CA at VWM, making it preferable for low-power DC systems where standby current matters.
What is the thermal resistance of the SMAJ11A-M3/61, and how does it affect layout design?
The SMAJ11A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard PCB layout per Vishay's recommended pad dimensions. To maintain safe junction temperatures during repetitive surges, designers must ensure adequate copper area and avoid excessive trace length between the SMAJ11A-M3/61 and ground plane. Derating applies above 25 °C ambient per Figure 2 in the datasheet.
Can the SMAJ11A-M3/61 replace older SMAJ11A variants in existing designs?
Yes-the SMAJ11A-M3/61 is a direct form-fit-function replacement for legacy SMAJ11A parts with E3 or non-RoHS suffixes, provided halogen-free compliance is acceptable. Its SMA (DO-214AC) package, pinout, and all electrical parameters-including VWM, VBR, VC, and PPPM-match the family specification. No PCB changes are required, and solder reflow profiles remain compatible per J-STD-020 MSL Level 1 guidelines.
SMAJ11A-M3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11A-M3/61 FAQ
1.How can I place an order for SMAJ11A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11A-M3/61 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 SMAJ11A-M3/61 reliable?
The price and inventory of SMAJ11A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ11A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11A-M3/61?
SMAJ11A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11A-M3/61 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 SMAJ11A-M3/61?
For technical support, including SMAJ11A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11A-M3/61 requirements.
6.How does Aetrix verify that SMAJ11A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ11A-M3/61 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 SMAJ11A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ11A-M3/61?
All SMAJ11A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11A-M3/61, 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 SMAJ11A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ11A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11A-M3/61 Tags
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