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Vishay General Semiconductor - Diodes Division SMAJ9.0C-E3/5A
- Part No.:
- SMAJ9.0C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0C-E3/5A.pdf
- Description:
- TVS DIODE 9VWM 16.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,400
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Product details
Overview
SMAJ9.0C-E3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on signal and power lines. It features a 9.0 V stand-off voltage (VWM), 16.9 V maximum clamping voltage (VC) at 23.7 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting I/O ports and sensor interfaces in industrial control systems.
For engineers reviewing the SMAJ9.0C-E3/5A datasheet, SMAJ9.0C-E3/5A pinout, SMAJ9.0C-E3/5A application, or SMAJ9.0C-E3/5A equivalent, key selection considerations include bi-directional surge suppression capability, low clamping ratio (VC/VWM = 1.88), RoHS-compliant matte tin terminals, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 10.0 V and 12.2 V at 1.0 mA test current. Its junction capacitance is not specified in the datasheet, but thermal resistance is characterized at RθJA = 120 °C/W and RθJL = 30 °C/W under standard mounting conditions.
The device complies with ANSI/IEEE C62.35 for surge protection, supports repetitive 0.01% duty cycle surges, and is rated for operation from −55 °C to +150 °C junction temperature. It meets JESD201 Class 1A whisker resistance and is qualified per J-STD-020 MSL Level 1 with peak reflow temperature of 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VC @ IPPM | 16.9 V - Clamped voltage during 23.7 A 10/1000 µs surge; limits stress on downstream ICs like microcontrollers or RS-485 transceivers. |
| IPPM | 23.7 A - Peak surge current it safely diverts without failure; determined by 10/1000 µs waveform and 0.2 × 0.2″ copper pad layout. |
| PPPM | 400 W - Peak pulse power dissipation capability; enables robust protection against lightning-induced or inductive-switching transients. |
| TJ Range | −55 °C to +150 °C - Full operational junction temperature range; supports deployment in automotive engine compartments and industrial enclosures. |
| Package | DO-214AC (SMA) - Surface-mount package with 2-terminal configuration, 5.28 mm × 4.50 mm footprint, compatible with standard SMT pick-and-place equipment. |
| RoHS | Compliant - Meets EU Directive 2002/95/EC; matte tin-plated leads meet J-STD-002 and JESD22-B102 solderability standards. |
Pinout & Package
DO-214AC (SMA) package: two-terminal, bi-directional device with no polarity marking; symmetrical construction means either terminal may serve as anode or cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (either end) | Bi-directional surge path | Both terminals connect to protected line and ground reference; conducts equally during positive or negative transients above VWM. |
| Case | Non-electrical mechanical interface | Plastic molded body provides insulation and mechanical stability; no electrical connection or thermal sinking function beyond ambient convection. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-232, CAN, USB D+/D−) without polarity concerns. |
| 400 W peak pulse power | Supports high-energy transients from inductive load switching (e.g., solenoid drivers, relay coils) in industrial PLC I/O modules. |
| Low clamping ratio (1.88) | Minimizes overvoltage exposure to sensitive 3.3 V or 5 V logic; ensures clamped voltage stays below absolute maximum ratings of common interface ICs. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile use (peak 260 °C) without baking - reduces manufacturing complexity and cost. |
| Glass-passivated junction | Improves long-term reliability and leakage stability under humid or thermally cycling conditions typical in outdoor telecom equipment. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I²C/SPI buses in factory-floor pressure/temperature sensors exposed to ESD and motor drive noise. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed between signal line and chassis ground, responding within <1 ns to transients exceeding 9.0 V. Use Value: Prevents latch-up or permanent damage to precision ADCs and microcontrollers while maintaining signal integrity below 9.0 V nominal operation. |
Use Scenario: Safeguarding LIN bus communication lines and window/mirror actuator control signals in vehicle door modules subject to load dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across LIN data line and battery ground, absorbing 10/1000 µs pulses up to 23.7 A without degradation. Use Value: Ensures uninterrupted communication during 12 V system transients (ISO 7637-2 Pulse 1/2a/5a), meeting OEM EMC requirements without added filtering. |
| Telecom Power Input Protection | Consumer USB Port ESD Guard |
|
Use Scenario: Front-end surge suppression on 48 V DC input of PoE-powered network switches and base station radios exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device shunting surge energy to ground before it reaches DC-DC converters and Ethernet PHYs. Use Value: Limits input rail overvoltage to ≤16.9 V during 400 W events, preventing catastrophic failure of upstream rectifiers and downstream PMICs. |
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+, D−) in portable speakers and docking stations subjected to ±8 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response bi-directional clamp placed adjacent to connector, diverting ESD current away from USB transceiver ESD structures. Use Value: Reduces post-ESD functional interrupt time by limiting voltage overshoot to <17 V, preserving USB enumeration and data transfer reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0CA-E3/5A | Identical electrical specs and packaging; "CA" suffix denotes same bi-directional variant per Vishay's naming convention - no functional difference from SMAJ9.0C-E3/5A. | No application difference; both intended for identical bi-directional surge protection roles. | Select SMAJ9.0CA-E3/5A only if BOM or procurement system requires explicit "CA" designation; otherwise SMAJ9.0C-E3/5A is fully interchangeable. |
| SMBJ9.0C-E3/52 | Same VWM (9.0 V) and VC (16.9 V), but higher PPPM = 600 W and larger SMB (DO-214AA) package; 5.3 mm × 4.6 mm vs. SMA's 5.28 mm × 4.50 mm. | Better suited for higher-energy environments (e.g., 24 V industrial power rails); requires larger PCB pad area and may not fit space-constrained layouts. | Choose SMBJ9.0C-E3/52 when surge energy exceeds 400 W capability or when board layout allows larger footprint; otherwise SMAJ9.0C-E3/5A offers optimal size/power balance. |
Compared with SMAJ9.0C-E3/5A, SMAJ9.0CA-E3/5A offers identical protection performance in the same compact SMA package, while SMBJ9.0C-E3/52 trades smaller footprint for 50% higher pulse power - making the original SMAJ9.0C-E3/5A ideal for space-limited, medium-energy applications such as sensor nodes and USB peripherals.
Availability
SMAJ9.0C-E3/5A is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, telecom power inputs, and consumer USB port protection requiring stable component supply and full traceability.
Supply support for SMAJ9.0C-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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for surface-mount transient suppression in harsh environments, targeting design-in across automotive, industrial, and communications infrastructure where robustness and consistency are critical.
FAQ
What is the clamping voltage of SMAJ9.0C-E3/5A under maximum surge conditions?
The SMAJ9.0C-E3/5A has a maximum clamping voltage (VC) of 16.9 V when subjected to its rated peak pulse current of 23.7 A with a 10/1000 µs waveform. This value is measured under standardized test conditions using 0.2 × 0.2″ copper pads per terminal and represents the upper limit of voltage seen by protected circuitry during worst-case transient events. The SMAJ9.0C-E3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ9.0C-E3/5A unidirectional or bidirectional, and how does that affect circuit placement?
SMAJ9.0C-E3/5A is a bi-directional transient voltage suppressor, meaning it functions identically for positive and negative voltage transients - no cathode band marking is present, and either terminal may be connected to the protected line or ground. This eliminates polarity concerns during layout and simplifies design for AC-coupled or floating interfaces like RS-485, CAN, or audio lines. The SMAJ9.0C-E3/5A does not require orientation verification during assembly.
Does SMAJ9.0C-E3/5A meet automotive qualification standards?
The base SMAJ9.0C-E3/5A is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ9.0CHE3/5A variant (with HE3 suffix), which is explicitly qualified to AEC-Q101 and rated for high-reliability automotive use. Engineers selecting SMAJ9.0C-E3/5A should verify system-level qualification requirements; the SMAJ9.0C-E3/5A remains suitable for non-safety-critical body electronics where full AEC-Q101 is not mandated.
What is the maximum steady-state reverse leakage current for SMAJ9.0C-E3/5A at its rated standoff voltage?
At its 9.0 V stand-off voltage (VWM) and 25 °C ambient temperature, the SMAJ9.0C-E3/5A exhibits a maximum reverse leakage current (ID) of 5.0 µA. This low leakage ensures minimal power loss and signal distortion in always-on monitoring circuits, such as 4–20 mA sensor loops or battery-backed real-time clocks. Leakage remains within specification across the full −55 °C to +150 °C junction temperature range.
Can SMAJ9.0C-E3/5A be used in parallel to increase surge current handling?
No - SMAJ9.0C-E3/5A is not designed for parallel operation due to parameter tolerances in breakdown voltage (VBR: 10.0–12.2 V) and dynamic impedance, which cause uneven current sharing and potential thermal runaway. For higher surge capacity, Vishay recommends stepping to the SMBJ or SMCJ series (e.g., SMBJ9.0C-E3/52), which offer higher PPPM ratings in larger packages. Using multiple SMAJ9.0C-E3/5A devices in parallel is not supported by Vishay's datasheet or application guidance.
SMAJ9.0C-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):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 16.9V
- Current - Peak Pulse (10/1000µs):
- 23.7A
- 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)
SMAJ9.0C-E3/5A FAQ
1.How can I place an order for SMAJ9.0C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0C-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 SMAJ9.0C-E3/5A reliable?
The price and inventory of SMAJ9.0C-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 SMAJ9.0C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ9.0C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0C-E3/5A?
SMAJ9.0C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0C-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 SMAJ9.0C-E3/5A?
For technical support, including SMAJ9.0C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0C-E3/5A requirements.
6.How does Aetrix verify that SMAJ9.0C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0C-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 SMAJ9.0C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ9.0C-E3/5A?
All SMAJ9.0C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0C-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 SMAJ9.0C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ9.0C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ9.0C-E3/5A Tags
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