My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ85CA-M3/61
- Part No.:
- SMAJ85CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CA-M3/61.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,358
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ85CA-M3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 85 V standoff voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 2.2 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 control systems.
For engineers reviewing the SMAJ85CA-M3/61 datasheet, SMAJ85CA-M3/61 pinout, SMAJ85CA-M3/61 application, or SMAJ85CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.61), AEC-Q101 qualification eligibility (via HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 85 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
The device is rated for repetitive 10/1000 μs surges at 0.01% duty cycle (400 W up to 78 V; 300 W above), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring minimum pad layout per Vishay spec for reliable power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 72–85 V DC bus or signal lines. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - tight breakdown window ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 137 V at 2.2 A - clamping voltage limits stress on protected ICs; clamping ratio = 1.61 supports robust overvoltage margin. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak pulse power handling with 10/1000 μs waveform; derates linearly above 25 °C ambient. |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inductive switch-off events. |
| TJ max | +150 °C - maximum junction temperature enables operation in under-hood automotive or industrial enclosures without forced cooling. |
| Package | SMA (DO-214AC) - surface-mount package with 5.28 mm × 4.50 mm footprint, compatible with standard reflow profiles (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional configuration has no polarity marking - both terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals serve as bidirectional surge current entry/exit points; no cathode band - enables layout flexibility and eliminates orientation errors during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, RS-485, sensor bridges) without polarity constraints. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising surge robustness. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD, inductive kick), improving protection margin for 3.3 V/5 V logic interfaces. |
| AEC-Q101 qualification option | HM3 variant available - validated for automotive applications including engine control, body electronics, and ADAS sensor front-ends. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump (ISO 16750-2) and alternator ripple-induced transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed at power input stage, clamping spikes before they reach LDOs and microcontrollers. Use Value: Withstands 300 W surges above 78 V and maintains VC ≤ 137 V, ensuring downstream 3.3 V/5 V regulators remain within absolute maximum ratings. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Bidirectional clamp on differential sensor lines (e.g., 4–20 mA loop, Wheatstone bridge) exposed to EFT and surge coupling. Use Value: Symmetrical VBR and low capacitance (<50 pF at 0 V) prevent signal distortion while suppressing ±1 kV ESD per IEC 61000-4-2. |
| Telecom Data Line Surge Suppression | Consumer Device USB/Display Port ESD Clamping |
|
Use Scenario: Front-end protection for PoE-powered Ethernet PHYs and xDSL line drivers subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on twisted-pair inputs, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: Fast <1 ns response and 137 V clamping limit enable compliance with GR-1089-CORE Level 3 (10/700 μs, 4 kV) without sacrificing data integrity. |
Use Scenario: ESD protection for USB 2.0 D+/D− and DisplayPort AUX CH lines in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to connector to minimize stub length and preserve signal integrity. Use Value: Junction capacitance <50 pF at 0 V and VC ≤ 137 V ensure <0.1 dB insertion loss at 480 MHz while passing IEC 61000-4-2 ±15 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA-E3/61 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (not halogen-free). | Approved for commercial-grade industrial and telecom use; not qualified for automotive AEC-Q101. | Select when halogen-free requirement is not mandated and cost sensitivity favors E3 over M3. |
| SMBJ85CA-M3 | Same VWM/VBR/VC, but SMB (DO-214AA) package - 20 % larger footprint (5.28 mm × 4.57 mm) and higher thermal mass. | Better power dissipation (400 W maintained up to higher ambient temps); less suitable for ultra-dense PCB layouts. | Choose when board space allows and higher thermal robustness is prioritized over miniaturization. |
Compared with SMAJ85CA-M3/61, the E3 variant trades halogen-free compliance for lower cost in non-automotive settings, while the SMBJ85CA-M3 offers improved thermal performance at the expense of PCB area - making SMAJ85CA-M3/61 optimal for space-constrained, automotive-qualified, and environmentally regulated designs.
Availability
SMAJ85CA-M3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface, telecom data line, and consumer USB/DisplayPort ESD protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ85CA-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 qualification.
The SMAJ series targets board-level transient suppression in harsh environments - engineered for fast response, repeatable clamping, and seamless integration into automated SMT lines across automotive, industrial, and communications markets.
FAQ
What is the clamping voltage of SMAJ85CA-M3/61 at its rated peak pulse current?
The SMAJ85CA-M3/61 has a maximum clamping voltage (VC) of 137 V at 2.2 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC and ensures predictable overvoltage limiting for protected circuits. The clamping occurs rapidly (<1 ns), minimizing energy delivered to downstream components. SMAJ85CA-M3/61 maintains this specification across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ85CA-M3/61 suitable for automotive applications?
SMAJ85CA-M3/61 itself is halogen-free and RoHS-compliant but not AEC-Q101 qualified; however, the functionally identical HM3 variant (e.g., SMAJ85CAHM3_A/H) carries full AEC-Q101 qualification. For automotive use, specify the HM3 suffix with appropriate revision code. SMAJ85CA-M3/61 remains suitable for non-automotive industrial and telecom applications where AEC-Q101 is not required. Always verify qualification status via Vishay's official part numbering guide before design-in.
How does the bidirectional nature of SMAJ85CA-M3/61 affect its PCB layout?
The bidirectional configuration of SMAJ85CA-M3/61 means both terminals are electrically identical - there is no cathode band or polarity marking, eliminating orientation constraints during placement. This simplifies PCB layout by allowing symmetric routing on differential lines or AC-coupled paths. Layout must still follow Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal to sustain 400 W pulse power. SMAJ85CA-M3/61 benefits from short, low-inductance traces to maximize transient response.
What is the thermal resistance of SMAJ85CA-M3/61, and how does it impact power handling?
SMAJ85CA-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. These values assume mounting on Vishay's specified minimum pad layout. At 25 °C ambient, the 3.3 W steady-state power dissipation (PD) yields ~400 °C junction rise - confirming that SMAJ85CA-M3/61 is intended for transient-only operation, not continuous power. Pulse derating curves (Fig. 2) must be applied for repeated surges above 25 °C.
Can SMAJ85CA-M3/61 replace SMAJ85A-M3/61 in a design?
No - SMAJ85CA-M3/61 is bidirectional, while SMAJ85A-M3/61 is unidirectional. Substituting them requires verifying circuit topology: bidirectional use (e.g., AC signal lines, floating buses) mandates SMAJ85CA-M3/61; unidirectional DC rails require SMAJ85A-M3/61 to avoid unintended conduction during reverse bias. Key differences include polarity marking (absent on CA), reverse leakage behavior, and clamping symmetry. SMAJ85CA-M3/61 cannot be used as a drop-in replacement without schematic and layout review.
SMAJ85CA-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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 300W
- 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)
SMAJ85CA-M3/61 FAQ
1.How can I place an order for SMAJ85CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CA-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 SMAJ85CA-M3/61 reliable?
The price and inventory of SMAJ85CA-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 SMAJ85CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ85CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CA-M3/61?
SMAJ85CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CA-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 SMAJ85CA-M3/61?
For technical support, including SMAJ85CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ85CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ85CA-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 SMAJ85CA-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ85CA-M3/61?
All SMAJ85CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CA-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 SMAJ85CA-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ85CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85CA-M3/61 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
