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Vishay General Semiconductor - Diodes Division SMAJ9.0CA-M3/5A
- Part No.:
- SMAJ9.0CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0CA-M3/5A.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,790
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Product details
Overview
SMAJ9.0CA-M3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 9.0 V stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA, 15.4 V maximum clamping voltage (VC) at 26.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial electronics.
For engineers reviewing the SMAJ9.0CA-M3/5A datasheet, SMAJ9.0CA-M3/5A pinout, SMAJ9.0CA-M3/5A application, or SMAJ9.0CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.71), AEC-Q101 qualification eligibility (via HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering identical electrical characteristics forward and reverse - critical for protecting AC-coupled or floating signal lines. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<5.0 μA at VWM), while the 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design for sustained surge handling.
The device meets MSL Level 1 per J-STD-020 (peak reflow ≤260 °C), supports 40 A non-repetitive forward surge current (IFSM), and exhibits a +0.074 %/°C temperature coefficient of VBR, enabling predictable voltage clamping across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse stand-off voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR min/max | 10.0 V / 11.1 V at 1 mA - Verified breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 15.4 V at 26.0 A - Clamped voltage under 10/1000 μs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 400 W - Peak pulse power dissipation capability with standard 10/1000 μs waveform; defines transient energy absorption capacity. |
| ID @ VWM | ≤5.0 μA - Reverse leakage current at rated stand-off voltage; ensures minimal quiescent power loss and signal integrity in high-impedance paths. |
| TJ max | +150 °C - Maximum junction temperature; sets upper limit for thermal design and derating above 25 °C ambient. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard footprint; guides minimum copper area needed for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Bidirectional construction has no polarity marking - symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied across device. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, or ungrounded lines without polarity constraints. |
| 400 W peak pulse power | Handles high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive environments when mounted on recommended 0.2" × 0.2" copper pads. |
| Low clamping ratio (VC/VWM = 1.71) | Minimizes overvoltage exposure to protected ICs - e.g., keeps 3.3 V or 5 V logic rails within safe margin during ESD or load dump events. |
| AEC-Q101 qualification option | Available with HM3 suffix (e.g., SMAJ9.0CA-HM3_X); validates reliability for automotive under-hood and infotainment applications. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile up to 260 °C peak - compatible with high-volume automated assembly without dry-pack requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail to divert surge current away from sensitive front-end circuitry. Use Value: Limits transient voltage to ≤15.4 V, preventing latch-up or gate oxide damage in 5 V-tolerant transceivers and ADC input stages. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and ground bounce in factory automation environments. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines to absorb repetitive 400 W pulses from relay coil de-energization or motor contactor switching. Use Value: Maintains system uptime by preventing false triggering or permanent failure of optocoupler input stages during 10/1000 μs transients up to 26 A. |
| Consumer USB Port ESD Protection | Telecom Line Interface Protection |
Use Scenario: Secondary-level surge suppression on USB 2.0 D+/D− lines in set-top boxes and smart displays exposed to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed after primary ESD array to handle higher-energy CDM or IEC 61000-4-5 surges. Use Value: Clamps fast-rising transients within <1 ps response time while adding <10 pF capacitance - preserving signal integrity up to 480 Mbps. |
Use Scenario: Protecting Ethernet PHY interface pins and RS-485 transceivers in network edge devices subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage transient suppressor on twisted-pair line side, coordinated with GDT or MOV secondary protection. Use Value: Absorbs up to 400 W of coupled surge energy while limiting common-mode voltage to <15.4 V - preventing PHY latch-up and data corruption. |
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 | Same electrical specs and package; RoHS-compliant but not halogen-free; uses standard tin plating instead of halogen-free formulation. | Preferred for commercial-grade applications where halogen-free certification is not mandated by end-equipment standards. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is unnecessary. |
| SMBJ9.0CA-M3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VC ratings; 10% higher clamping voltage (17.0 V) at 43.0 A. | Better suited for higher-energy threats (e.g., ISO 16750-2 long-duration surges) where board space allows larger footprint. | Choose when surge energy exceeds 400 W capability and PCB layout permits SMB package size. |
Compared with SMAJ9.0CA-M3/5A, SMAJ9.0CA-E3/5A offers identical protection performance with lower material compliance cost, while SMBJ9.0CA-M3 trades compactness for higher surge robustness - making SMAJ9.0CA-M3/5A optimal for space-constrained, halogen-free, automotive-qualified designs needing precise 400 W/15.4 V clamping.
Availability
SMAJ9.0CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB port protection, and telecom line interface circuits requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMAJ9.0CA-M3/5A 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, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series was developed for high-reliability transient suppression in space-constrained, high-volume SMT applications - targeting automotive, industrial, and communications systems where consistent clamping, low leakage, and robust surge handling are mandatory.
FAQ
What is the clamping voltage of SMAJ9.0CA-M3/5A at its rated peak pulse current?
The SMAJ9.0CA-M3/5A has a maximum clamping voltage (VC) of 15.4 V at 26.0 A peak pulse current (IPPM) under the standard 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 SMAJ9.0CA-M3/5A maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), with minimal drift due to its +0.074 %/°C VBR temperature coefficient.
Is SMAJ9.0CA-M3/5A suitable for automotive applications?
Yes - SMAJ9.0CA-M3/5A is halogen-free and RoHS-compliant, and its base part number SMAJ9.0CA qualifies for AEC-Q101 when ordered with the HM3 suffix (e.g., SMAJ9.0CA-HM3_A). The device's 400 W surge rating, 15.4 V clamping, and MSL Level 1 reflow compatibility meet requirements for engine control units, body electronics, and infotainment systems. The SMAJ9.0CA-M3/5A itself carries the M3 halogen-free designation and is built to Vishay's automotive-grade process controls, though final AEC-Q101 certification applies only to HM3-suffixed variants.
How does the bidirectional design of SMAJ9.0CA-M3/5A affect its circuit implementation?
The SMAJ9.0CA-M3/5A has no polarity marking and functions identically in both directions, allowing direct placement across AC-coupled lines, differential pairs (e.g., RS-485, CAN), or ungrounded power rails without orientation concerns. Unlike unidirectional TVS diodes, it eliminates risk of incorrect installation and simplifies layout for floating or symmetric signal paths. Its symmetrical VBR (10.0–11.1 V) and VC (15.4 V) ensure matched clamping behavior regardless of transient polarity - a key advantage in bidirectional communication interfaces protected by SMAJ9.0CA-M3/5A.
What is the thermal resistance and how does it impact PCB layout for SMAJ9.0CA-M3/5A?
The SMAJ9.0CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal trace width and standard FR-4 thickness; reducing copper area increases thermal impedance and risks exceeding the +150 °C maximum junction temperature during repetitive surges. To maintain reliability, designers must allocate adequate copper pour and avoid narrow traces - especially critical when using SMAJ9.0CA-M3/5A in high-duty-cycle industrial applications.
Can SMAJ9.0CA-M3/5A replace SMAJ9.0A-M3/5A in a design?
No - SMAJ9.0CA-M3/5A is bidirectional, while SMAJ9.0A-M3/5A is unidirectional with cathode marking and asymmetric conduction (forward-biased operation only). Substituting them without circuit review risks failure: SMAJ9.0A-M3/5A would short-circuit AC signals or reverse-biased rails, whereas SMAJ9.0CA-M3/5A provides correct protection in those cases. The SMAJ9.0CA-M3/5A also has different leakage (≤5.0 μA vs. ≤1.0 μA for unidirectional at VWM) and slightly higher VBR tolerance. Always verify polarity, signal topology, and leakage requirements before interchanging SMAJ9.0CA-M3/5A and SMAJ9.0A-M3/5A.
SMAJ9.0CA-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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)
SMAJ9.0CA-M3/5A FAQ
1.How can I place an order for SMAJ9.0CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0CA-M3/5A 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 SMAJ9.0CA-M3/5A reliable?
The price and inventory of SMAJ9.0CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ9.0CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0CA-M3/5A?
SMAJ9.0CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0CA-M3/5A 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 SMAJ9.0CA-M3/5A?
For technical support, including SMAJ9.0CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ9.0CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0CA-M3/5A 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 SMAJ9.0CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ9.0CA-M3/5A?
All SMAJ9.0CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0CA-M3/5A, 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 SMAJ9.0CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ9.0CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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