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Vishay General Semiconductor - Diodes Division SMAJ11C-E3/5A
- Part No.:
- SMAJ11C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11C-E3/5A.pdf
- Description:
- TVS DIODE 11VWM 20.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,007
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Product details
Overview
SMAJ11C-E3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection on signal and power lines. It features a 11 V stand-off voltage (VWM), 20.1 V maximum clamping voltage (VC) at 19.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for safeguarding I/O ports and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ11C-E3/5A datasheet, SMAJ11C-E3/5A pinout, SMAJ11C-E3/5A application, or SMAJ11C-E3/5A equivalent, key selection criteria include bi-directional surge handling capability, low clamping ratio (VC/VWM = 1.83), junction temperature range (–55 °C to +150 °C), RoHS-compliant matte tin terminations, and MSL Level 1 moisture sensitivity rating.
Technical Context
The SMAJ11C-E3/5A operates as a bi-directional avalanche diode, exhibiting symmetrical breakdown behavior in both polarities with no polarity marking. Its glass-passivated junction enables fast response (<1 ps) to transients induced by ESD, lightning, or inductive switching - critical for protecting sensitive analog inputs and digital communication lines.
Thermal performance is defined by RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), supporting reliable operation under repetitive surge conditions when mounted on 0.2 × 0.2" copper pads. The device meets J-STD-020 MSL Level 1 and withstands solder reflow up to 260 °C for 40 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 12 V nominal systems. |
| VC @ IPPM | 20.1 V - Clamped voltage at 19.9 A peak pulse current; ensures downstream ICs see <20.1 V during 10/1000 µs surges. |
| PPPM | 400 W - Peak pulse power dissipation capability with 10/1000 µs waveform; supports high-energy transient suppression without failure. |
| IPPM | 19.9 A - Maximum non-repetitive peak surge current; determines minimum trace width and PCB layout robustness required. |
| TJ Range | –55 °C to +150 °C - Operating junction temperature range; enables deployment in under-hood automotive or industrial environments. |
| Package | DO-214AC (SMA) - Surface-mount package with 2.54 mm lead pitch; compatible with standard SMT pick-and-place and reflow processes. |
Pinout & Package
DO-214AC (SMA) package: bi-directional device with no polarity marking; both terminals are electrically symmetric and interchangeable. Cathode band absent per bi-directional designation (C suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Either terminal serves as current entry/exit point during bidirectional surge events; no orientation requirement in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge testing when properly laid out on PCB. |
| Low clamping ratio (VC/VWM = 1.83) | Minimizes voltage overshoot across protected circuitry, reducing risk of latch-up or gate oxide damage. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics. |
| RoHS-compliant matte tin leads | Ensures solderability per J-STD-002 and eliminates whisker risk (JESD 201 Class 1A). |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors exposed to load dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bi-directional TVS clamping transient energy before it reaches ADC input or signal conditioning amplifier. Use Value: Maintains signal integrity below 20.1 V during 10/1000 µs surges up to 19.9 A, preventing sensor data corruption or microcontroller reset. |
Use Scenario: Safeguarding CANH/CANL differential pair against ESD and inductive kickback in factory automation controllers. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) bi-directional clamp placed directly at connector entry point. Use Value: Limits common-mode surge voltage to <20.1 V while preserving CAN signal rise/fall times due to minimal parasitic capacitance. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D– lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) bi-directional clamp absorbing ±15 kV contact discharge per IEC 61000-4-2. Use Value: Clamps transients within 1 ps while adding <100 pF capacitance - negligible impact on 480 Mbps USB signaling integrity. |
Use Scenario: Primary surge protection on twisted-pair DSL lines entering residential gateways exposed to lightning-induced surges. IC Role / Device Role / Timing Role: High-energy (400 W) bi-directional suppressor placed upstream of line driver/receiver ICs. Use Value: Withstands repeated 10/1000 µs surges up to 19.9 A without degradation, extending system field life in lightning-prone regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CA-E3/5A | Identical electrical specs and package; CA suffix denotes same bi-directional construction per Vishay nomenclature. | No functional difference; CA and C suffixes are interchangeable per Vishay documentation for this family. | Select SMAJ11CA-E3/5A only if legacy BOM references CA suffix; otherwise SMAJ11C-E3/5A is direct functional match. |
| SMCJ11C-E3/57T | Higher 1500 W peak pulse power, larger DO-214AB (SMB) package, 22.5 V clamping voltage at 65.1 A. | Better suited for higher-energy threats (e.g., IEC 61000-4-5 Level 4 with lower source impedance), but requires larger PCB area. | Choose SMCJ11C-E3/57T only when surge threat level exceeds 400 W capability; SMAJ11C-E3/5A remains optimal for space-constrained 12 V interface protection. |
Compared with SMAJ11CA-E3/5A (identical function) and SMCJ11C-E3/57T (higher-power, larger footprint), the SMAJ11C-E3/5A delivers optimal balance of 400 W surge handling, SMA package size, and 20.1 V clamping - making it the preferred choice for cost- and space-sensitive 12 V system I/O protection where threat levels align with its rating.
Availability
SMAJ11C-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB port protection, and telecom DSL line surge suppression requiring stable component supply and full traceability.
Supply support for SMAJ11C-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMAJ series is engineered specifically for surface-mount transient voltage suppression in harsh environments, emphasizing robust surge handling, tight parametric tolerances, and AEC-Q101 qualification readiness for automotive-grade variants.
FAQ
What is the clamping voltage of SMAJ11C-E3/5A at its rated peak pulse current?
The SMAJ11C-E3/5A has a maximum clamping voltage (VC) of 20.1 V at its rated peak pulse current (IPPM) of 19.9 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and guarantees that protected circuits will not experience voltages exceeding 20.1 V during specified surge events. The SMAJ11C-E3/5A maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMAJ11C-E3/5A unidirectional or bidirectional, and how is polarity identified?
SMAJ11C-E3/5A is a bi-directional transient voltage suppressor, meaning it provides symmetrical clamping in both forward and reverse directions. As confirmed in Vishay Document 88390, bi-directional types like SMAJ11C-E3/5A have no polarity marking - the device lacks a cathode band and both terminals are functionally identical. This eliminates orientation errors during automated placement and simplifies PCB layout for AC or floating signal lines.
What is the maximum peak pulse power rating for SMAJ11C-E3/5A, and under what test condition?
The SMAJ11C-E3/5A is rated for 400 W peak pulse power dissipation with a 10/1000 µs exponential waveform, tested at TA = 25 °C on 0.2 × 0.2" copper pads per Figure 2 in Vishay Document 88390. This rating applies to devices with VWM ≤ 78 V; above 78 V, the rating drops to 300 W. The SMAJ11C-E3/5A falls within the 400 W category due to its 11 V stand-off voltage.
Does SMAJ11C-E3/5A meet automotive reliability standards?
The base SMAJ11C-E3/5A variant is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the SMAJ11CHE3/5A variant (HE3 suffix) which is AEC-Q101 qualified for automotive applications. Engineers specifying SMAJ11C-E3/5A for automotive use should verify qualification requirements and consider the HE3 version if compliance with AEC-Q101 is mandatory. The SMAJ11C-E3/5A itself meets MSL Level 1 and solder dip specifications suitable for many automotive sub-systems.
What is the junction-to-ambient thermal resistance of SMAJ11C-E3/5A, and why does it matter?
The typical junction-to-ambient thermal resistance (RθJA) of SMAJ11C-E3/5A is 120 °C/W, as specified in Vishay Document 88390. This parameter determines how effectively heat generated during surge events dissipates into the PCB environment. A lower RθJA allows higher duty-cycle operation; the 120 °C/W value assumes minimum recommended pad layout (0.2 × 0.2" copper per terminal). Exceeding thermal limits risks parametric shift or failure - so proper copper pour design is essential for sustained reliability of SMAJ11C-E3/5A.
SMAJ11C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 20.1V
- Current - Peak Pulse (10/1000µs):
- 19.9A
- 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)
SMAJ11C-E3/5A FAQ
1.How can I place an order for SMAJ11C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11C-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 SMAJ11C-E3/5A reliable?
The price and inventory of SMAJ11C-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 SMAJ11C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ11C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11C-E3/5A?
SMAJ11C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11C-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 SMAJ11C-E3/5A?
For technical support, including SMAJ11C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11C-E3/5A requirements.
6.How does Aetrix verify that SMAJ11C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ11C-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 SMAJ11C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ11C-E3/5A?
All SMAJ11C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11C-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 SMAJ11C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ11C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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