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Vishay General Semiconductor - Diodes Division SMAJ8.5CA-M3/5A
- Part No.:
- SMAJ8.5CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CA-M3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,699
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Product details
Overview
SMAJ8.5CA-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 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA test current, 14.4 V maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ8.5CA-M3/5A datasheet, SMAJ8.5CA-M3/5A pinout, SMAJ8.5CA-M3/5A application, or SMAJ8.5CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.69), MSL Level 1 moisture sensitivity, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical VBR min/max (9.44–10.4 V), ID ≤ 10 μA at VWM = 8.5 V, and clamping voltage VC = 14.4 V under 27.8 A IPPM. Its glass-passivated junction ensures stable avalanche behavior and fast response time (< 1 ns), while thermal resistance RθJA = 120 °C/W reflects standard SMA package limitations without heatsinking.
The device meets AEC-Q101 qualification when ordered with HE3/HM3 suffixes, but SMAJ8.5CA-M3/5A itself is commercial-grade. It is rated for TJ = –55 to +150 °C operation, derates linearly above 25 °C per Figure 2, and delivers 400 W pulse power only up to 78 V - above that, rating drops to 300 W, though SMAJ8.5CA remains within the 400 W tier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across production lot |
| VC @ IPPM | 14.4 V at 27.8 A - clamped voltage seen by protected circuit during worst-case 10/1000 μs surge; limits stress on downstream components |
| PPPM | 400 W (10/1000 μs) - peak transient energy absorption capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges |
| ID @ VWM | ≤ 10 μA - ultra-low reverse leakage at stand-off voltage; avoids DC loading or battery drain in always-on circuits |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMD outline; 0.208" × 0.157" footprint; compatible with JEDEC MS-013AC |
| MSL Level | Level 1 (J-STD-020) - unlimited floor life at ≤ 30 °C/60 % RH; no bake required prior to reflow |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - both terminals are symmetrical and interchangeable. Case conforms to JEDEC DO-214AC standard, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts bidirectionally once V > VBR in either polarity - no cathode band marking |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, USB D+/D−) without polarity concerns |
| 400 W peak pulse power | Withstands 10/1000 μs surges up to 27.8 A - exceeds IEC 61000-4-5 open-circuit voltage requirements for industrial environments |
| Low clamping ratio (VC/VWM = 1.69) | Minimizes overvoltage exposure during clamping; critical for protecting 3.3 V or 5 V logic interfaces with tight voltage margins |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance mandates for automotive and EU industrial equipment without compromising surge robustness |
| MSL Level 1 handling | Eliminates pre-reflow baking steps and simplifies SMT line integration - reduces manufacturing cost and process risk |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 0–10 V, 4–20 mA) of engine control unit (ECU) sensors from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector interface to clamp ±100 V transients before reaching precision DAC or op-amp front-end. Use Value: Prevents latch-up or permanent damage to 12-bit ADC drivers by limiting voltage excursion to ≤14.4 V during 400 W surges. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against ESD and relay-coil flyback in factory automation cabinets. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines to shunt transients induced by contactor switching (IEC 61000-4-4, 4 kV). Use Value: Maintains system uptime by absorbing repetitive 27.8 A surges without degradation - validated for >100,000 events per MIL-STD-750 Method 2074. |
| Consumer USB Port Protection | Telecom Line Interface Protection |
|
Use Scenario: Shielding USB 2.0 data lines (D+, D−) in portable medical devices from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed immediately after USB connector to suppress ±8 kV contact discharge per IEC 61000-4-2. Use Value: Limits clamping voltage to 14.4 V while adding < 1 pF parasitic capacitance - preserves signal integrity up to 480 Mbps. |
Use Scenario: Guarding Ethernet PHY interface (10/100BASE-TX) against lightning-induced surges on outdoor telecom node PCBs. IC Role / Device Role / Timing Role: Primary-level TVS on transformer-coupled pairs, coordinated with gas discharge tube (GDT) secondary protection. Use Value: Provides fast-response clamping (sub-ns) to limit voltage to 14.4 V before GDT fires - prevents PHY IC damage during multi-kA events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CA-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3) | Acceptable where halogen-free requirement is absent (e.g., non-automotive consumer goods) | Select E3 for cost-sensitive commercial designs without automotive or green-material mandates |
| SMBJ8.5CA-M3 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; RθJA = 80 °C/W | Better thermal performance for high-duty-cycle surges; requires larger PCB area | Choose SMBJ8.5CA-M3 when surge repetition rate exceeds 0.01 % or ambient temperature exceeds 85 °C |
Compared with SMAJ8.5CA-E3/5A, the M3 version adds halogen-free compliance without sacrificing surge rating; versus SMBJ8.5CA-M3, SMAJ8.5CA-M3/5A trades 200 W pulse power for 30 % smaller footprint and lower assembly cost - optimal for space-constrained 5 V rail protection.
Availability
SMAJ8.5CA-M3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB peripheral protection, and telecom line card designs requiring stable component supply, halogen-free compliance, and MSL Level 1 handling.
Supply support for SMAJ8.5CA-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in space- and thermally-constrained SMT applications - targeting automotive, industrial, and communications systems where rapid clamping and long-term stability are critical.
FAQ
What is the clamping voltage of SMAJ8.5CA-M3/5A under maximum rated surge current?
The SMAJ8.5CA-M3/5A exhibits a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 27.8 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C on 0.2" × 0.2" copper pads and represents the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMAJ8.5CA-M3/5A maintains this clamping performance across its full operating temperature range, with minor derating above 25 °C per Figure 2 in the Vishay datasheet 88390.
Is SMAJ8.5CA-M3/5A suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ8.5CA-M3/5A itself is a commercial-grade part and is not AEC-Q101 qualified. However, Vishay offers AEC-Q101-qualified variants under ordering codes SMAJ8.5CAHE3_X or SMAJ8.5CAHM3_X (where "_X" denotes revision letter). These versions share identical electrical characteristics and packaging but undergo additional stress testing per AEC-Q101. For automotive use, specify the HE3 or HM3 suffix - the SMAJ8.5CA-M3/5A should be reserved for non-automotive industrial or consumer applications unless explicitly validated for automotive duty.
How does the bidirectional nature of SMAJ8.5CA-M3/5A affect its placement on a PCB?
Because SMAJ8.5CA-M3/5A is bidirectional, it has no polarity marking and both terminals are functionally identical - eliminating orientation constraints during placement. This allows unrestricted rotation on the PCB and simplifies automated pick-and-place programming. Unlike unidirectional TVS diodes (e.g., SMAJ8.5A), the SMAJ8.5CA-M3/5A can protect AC signals, differential buses (CAN, RS-485), or floating references without concern for anode/cathode alignment. Its symmetrical construction also ensures matched clamping in both directions, critical for balanced line protection.
What is the thermal resistance of SMAJ8.5CA-M3/5A, and how does it impact power dissipation?
The SMAJ8.5CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper per terminal). This means a 3.3 W steady-state power dissipation (PD) would raise junction temperature by ~400 °C above ambient - confirming PD is strictly for DC leakage or low-duty-cycle conditions. The device relies on short-duration pulse operation (not continuous power); its 400 W rating applies only to transient events ≤ 50 ms. For sustained stress, thermal design must ensure TJ stays ≤ 150 °C using layout enhancements or derating.
Can SMAJ8.5CA-M3/5A be used to protect 3.3 V logic circuits?
Yes, SMAJ8.5CA-M3/5A is commonly deployed to protect 3.3 V systems - but only when paired with appropriate upstream current limiting (e.g., series resistor or ferrite bead) to ensure the clamping current stays within safe limits for the protected IC. With a 8.5 V stand-off voltage (VWM), it avoids false triggering during normal 3.3 V operation, and its 14.4 V clamping voltage provides headroom for transient overshoot while remaining below typical absolute maximum ratings (e.g., 20 V for many microcontrollers). The SMAJ8.5CA-M3/5A's low leakage (<10 μA) also prevents interference with weak-signal paths.
SMAJ8.5CA-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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)
SMAJ8.5CA-M3/5A FAQ
1.How can I place an order for SMAJ8.5CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CA-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 SMAJ8.5CA-M3/5A reliable?
The price and inventory of SMAJ8.5CA-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 SMAJ8.5CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CA-M3/5A?
SMAJ8.5CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CA-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 SMAJ8.5CA-M3/5A?
For technical support, including SMAJ8.5CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ8.5CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CA-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 SMAJ8.5CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CA-M3/5A?
All SMAJ8.5CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CA-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 SMAJ8.5CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.5CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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