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Vishay General Semiconductor - Diodes Division SMAJ8.5CA-M3/61
- Part No.:
- SMAJ8.5CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CA-M3/61.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,754
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Product details
Overview
SMAJ8.5CA-M3/61 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 and power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the SMAJ8.5CA-M3/61 datasheet, SMAJ8.5CA-M3/61 pinout, SMAJ8.5CA-M3/61 application, or SMAJ8.5CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.69), MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and AEC-Q101 qualification readiness via HM3 suffix variants.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (9.44–10.4 V), ID ≤ 10 μA at VWM = 8.5 V, and thermal resistance RθJA = 120 °C/W. Its junction capacitance is not specified in the datasheet for this variant, and it exhibits a temperature coefficient of VBR = +0.073 %/°C.
The device delivers 400 W peak pulse power up to 78 V; above that threshold, rating drops to 300 W per note (1). It supports repetitive surge events at 0.01 % duty cycle and withstands 40 A non-repetitive forward surge (IFSM) - applicable only to unidirectional types, thus not relevant for SMAJ8.5CA-M3/61.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - ensures reliable breakdown initiation within tight tolerance |
| VC @ IPPM | 14.4 V at 27.8 A - clamps transient spikes to safe level for downstream 3.3 V/5 V logic |
| PPPM | 400 W (10/1000 μs) - handles typical ESD and lightning-induced surges in automotive and industrial environments |
| ID @ VWM | ≤ 10 μA - negligible leakage current preserves signal integrity on high-impedance sensor lines |
| TJ max. | +150 °C - enables operation in under-hood automotive and industrial control cabinet applications |
| Package | SMA (DO-214AC) - compact 2-pin SMD footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive polarity) | Accepts surge energy during positive half-cycle; symmetrical with cathode in bidirectional mode |
| Cathode | Transient current entry point (negative polarity) | Accepts surge energy during negative half-cycle; functionally identical to anode for SMAJ8.5CA |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 2 Ω source impedance with margin |
| Low clamping voltage ratio (VC/VWM = 1.69) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without pre-baking or special handling |
| Halogen-free & RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for global industrial and automotive supply chains |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input or LIN driver. Use Value: Limits transient excursions to ≤14.4 V, preventing latch-up or gate oxide damage in 5 V-tolerant automotive MCUs. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges and ground loop transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input line upstream of optocoupler or Schmitt trigger input stage. Use Value: Clamps 1 kV/500 A surges to <15 V within <1 ns, preserving signal integrity and enabling robust 10 kHz switching detection. |
| USB Port ESD Protection | Telecom Line Interface |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in host controllers exposed to human-body-model (HBM) discharges. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed after primary polymer-based TVS, directly at connector. Use Value: Adds <10 μA leakage and sub-15 V clamping to meet IEC 61000-4-2 ±8 kV contact discharge immunity without signal distortion. |
Use Scenario: Surge suppression on RS-485/RS-422 differential pairs in base station backhaul equipment. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, placed before receiver termination network. Use Value: Maintains differential signal fidelity while diverting common-mode surges up to 400 W, meeting GR-1089-CORE Level 3 requirements. |
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-E3/61 | RoHS-compliant commercial grade; no halogen-free certification; same electrical specs and package | Preferred for cost-sensitive industrial controls where halogen-free is not mandated | Select when halogen-free material content is not required by end-customer specification |
| SMAJ8.5CAHM3_A/H | AEC-Q101 qualified, halogen-free, 7″ tape-and-reel; identical VWM, VBR, VC, and PPPM | Mandatory for automotive body electronics and ADAS sensor modules requiring automotive qualification | Choose for automotive production programs requiring full AEC-Q101 documentation and traceability |
Compared with SMAJ8.5CA-M3/61, the E3 variant offers identical protection performance at lower cost but lacks halogen-free compliance, while the HM3_A/H version adds AEC-Q101 qualification and tighter process controls - critical for automotive deployment but unnecessary for commercial-grade industrial use.
Availability
SMAJ8.5CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB port ESD hardening, and telecom line protection requiring stable component supply and consistent halogen-free compliance.
Supply support for SMAJ8.5CA-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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series targets board-level transient suppression in harsh environments, engineered for fast response (<1 ns), low clamping, and robust surge handling in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the clamping voltage of SMAJ8.5CA-M3/61 at its rated peak pulse current?
The SMAJ8.5CA-M3/61 has a maximum clamping voltage (VC) of 14.4 V at 27.8 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value ensures protected circuits remain below critical overvoltage thresholds during surge events. The SMAJ8.5CA-M3/61 maintains this clamping performance across its operational temperature range of –55 °C to +150 °C.
Is SMAJ8.5CA-M3/61 suitable for automotive applications?
SMAJ8.5CA-M3/61 is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay offers the SMAJ8.5CAHM3_A/H variant, which carries full AEC-Q101 qualification. The SMAJ8.5CA-M3/61 may be used in non-safety-critical automotive subsystems where qualification is not mandated, but design validation remains the customer's responsibility.
Does SMAJ8.5CA-M3/61 have polarity markings on the package?
No - SMAJ8.5CA-M3/61 is a bidirectional TVS diode and carries no cathode band or polarity marking on the SMA (DO-214AC) case. Its symmetrical construction allows installation in either orientation on PCBs, simplifying layout and reducing assembly errors. Unidirectional variants (e.g., SMAJ8.5A-M3/61) do feature a cathode band.
What is the maximum leakage current of SMAJ8.5CA-M3/61 at its stand-off voltage?
At VWM = 8.5 V and TA = 25 °C, the SMAJ8.5CA-M3/61 exhibits a maximum reverse leakage current (ID) of 10 μA. This low leakage preserves signal integrity on high-impedance sensor lines and minimizes standby power loss in battery-operated systems. Leakage increases with temperature but remains well below 100 μA up to +125 °C.
Can SMAJ8.5CA-M3/61 replace SMAJ8.5A-M3/61 in a circuit?
No - SMAJ8.5CA-M3/61 is bidirectional, while SMAJ8.5A-M3/61 is unidirectional. Substituting one for the other risks improper clamping during negative transients or forward conduction in DC-biased lines. The SMAJ8.5CA-M3/61 must only replace other CA-suffix parts. Always verify circuit topology and bias conditions before interchange.
SMAJ8.5CA-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:
- -
- 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-M3/61 FAQ
1.How can I place an order for SMAJ8.5CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CA-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 SMAJ8.5CA-M3/61 reliable?
The price and inventory of SMAJ8.5CA-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 SMAJ8.5CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CA-M3/61?
SMAJ8.5CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CA-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 SMAJ8.5CA-M3/61?
For technical support, including SMAJ8.5CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ8.5CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CA-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 SMAJ8.5CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CA-M3/61?
All SMAJ8.5CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CA-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 SMAJ8.5CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ8.5CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5CA-M3/61 Tags
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