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Vishay General Semiconductor - Diodes Division SMAJ85A-M3/5A
- Part No.:
- SMAJ85A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85A-M3/5A.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,710
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Product details
Overview
SMAJ85A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 85 V stand-off 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It protects MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive ECUs.
For engineers reviewing the SMAJ85A-M3/5A datasheet, SMAJ85A-M3/5A pinout, SMAJ85A-M3/5A application, or SMAJ85A-M3/5A equivalent, key selection criteria include unidirectional polarity, 137 V clamping performance at 2.2 A, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification eligibility via HM3 suffix variants, and halogen-free RoHS compliance per M3 marking.
Technical Context
This TVS diode operates as a voltage-clamping protection device placed in parallel with sensitive circuit nodes. Its silicon avalanche junction responds within <1 ps to transient overvoltages, limiting voltage excursions to ≤137 V during 10/1000 μs surges up to 2.2 A. The device is rated for repetitive operation at 0.01 % duty cycle and derates linearly above 25 °C ambient per Fig. 2.
Designed for PCB-level ESD and surge immunity, SMAJ85A-M3/5A uses glass-passivated chip construction and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Its SMA package supports automated placement and meets UL 94 V-0 flammability rating, with MSL Level 1 moisture sensitivity per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - Confirmed avalanche onset window; ensures predictable turn-on across production lot. |
| VC @ IPPM | 137 V at 2.2 A - Clamped voltage under standardized 10/1000 μs surge; determines protected node's max stress level. |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - Peak pulse power handling per JEDEC standard; defines single-event surge robustness. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off; negligible loading on 85 V bias rails. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on minimum pad layout; guides heatsinking and power derating. |
| TJ max | +150 °C - Maximum junction temperature; sets upper limit for ambient + self-heating in continuous operation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode-banded unidirectional configuration. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H), with 2.54 mm lead pitch and matte tin-plated terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; completes clamping path during positive transients. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 85 V supply rail); band-marked end accepts surge energy into avalanche junction. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge events on 85 V DC bus without failure. |
| 137 V clamping voltage at 2.2 A | Limits downstream IC voltage stress to safe margin below typical 150 V absolute maximum ratings. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 Annex II updates. |
| MSL Level 1, peak reflow 260 °C | Enables single-pass lead-free reflow assembly without preconditioning or baking. |
| AEC-Q101 qualification path | Base P/NHM3_X variant available for automotive applications requiring stress-tested reliability validation. |
Applications
| Industrial Power Supply Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protects 85 V auxiliary power rail in programmable logic controller (PLC) power modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional shunt clamping device placed between 85 V rail and chassis ground. Use Value: Limits transient overshoot to ≤137 V, preventing damage to 150 V-rated DC-DC controllers and gate drivers. |
Use Scenario: Shields CAN transceiver power pins and microcontroller I/O in engine control units exposed to ISO 7637-2 Pulse 5a load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 85 V battery-sensed supply line feeding high-side driver ICs. Use Value: Responds in <1 ps to clamp 120 V/200 ms load dump events to 137 V, preserving system uptime and ASIL-B compliance. |
| Telecom Base Station DC Feeds | Industrial Sensor Signal Conditioning |
Use Scenario: Safeguards remote radio unit (RRU) power inputs receiving 85 V DC from centralized plant rectifiers. IC Role / Device Role / Timing Role: Front-end transient suppressor on primary DC input before bulk capacitance and DC-DC stages. Use Value: Absorbs 400 W surges without degradation, maintaining >10⁵ surge cycles lifetime per Telcordia GR-1089-CORE. |
Use Scenario: Protects analog front-end of 4–20 mA loop-powered pressure sensors connected to 85 V field wiring. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) clamping element across sensor supply and return lines. Use Value: Prevents false triggering and ADC saturation during ESD events while adding negligible offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/5A | RoHS-compliant but not halogen-free; same electrical specs and package. | No difference in protection function; used where halogen content is unrestricted. | Select when cost-sensitive commercial designs require RoHS but not halogen-free compliance. |
| SMAJ85AHM3_A/I | AEC-Q101 qualified, halogen-free, supplied in 13" reel (7500 pcs); identical clamping and thermal specs. | Required for automotive production programs needing PPAP documentation and stress-test validation. | Choose for Tier 1 automotive BOMs where qualification traceability and long-term supply continuity are mandatory. |
Compared with SMAJ85A-M3/5A, the E3 variant offers identical protection performance at lower cost for non-automotive use, while the HM3_A/I variant adds AEC-Q101 validation and larger reel packaging-enabling direct drop-in replacement in qualified automotive systems without layout change.
Availability
SMAJ85A-M3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, telecom base station feeds, and sensor signal conditioning requiring stable component supply and halogen-free compliance.
Supply support for SMAJ85A-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 targets board-level transient protection in space-constrained, high-reliability environments-designed to meet IEC 61000-4-2/4-5, ISO 16750-2, and AEC-Q101 requirements across industrial and automotive domains.
FAQ
What is the clamping voltage of SMAJ85A-M3/5A at its rated peak pulse current?
The SMAJ85A-M3/5A has a maximum clamping voltage (VC) of 137 V at 2.2 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is confirmed in the Electrical Characteristics table of Vishay document 88390. The SMAJ85A-M3/5A maintains this clamping performance across its full operating temperature range when mounted per recommended pad layout.
Is SMAJ85A-M3/5A suitable for automotive applications?
SMAJ85A-M3/5A itself is not AEC-Q101 qualified, but it belongs to the SMAJ family for which Vishay offers AEC-Q101 variants-specifically SMAJ85AHM3_A/I (halogen-free, qualified). The SMAJ85A-M3/5A shares identical electrical and thermal specifications, enabling design reuse; qualification is achieved via suffix and packaging differentiation. For production automotive use, specify the HM3_A/I variant to ensure compliance with stress-test requirements.
What does the "M3" suffix indicate in SMAJ85A-M3/5A?
The "M3" suffix in SMAJ85A-M3/5A denotes halogen-free, RoHS-compliant construction meeting IPC-1752A material declaration standards and EU Directive 2015/863 Annex II. It also indicates compliance with JESD 201 Class 2 whisker testing and J-STD-002 solderability. This distinguishes it from the E3 suffix (RoHS only) and HE3/HM3 variants (AEC-Q101 qualified). The SMAJ85A-M3/5A is intended for commercial and industrial applications requiring environmentally restricted substance compliance.
How does SMAJ85A-M3/5A differ from bidirectional SMAJ85CA variants?
SMAJ85A-M3/5A is unidirectional with cathode band marking and conducts only in reverse breakdown; SMAJ85CA is bidirectional with no polarity marking and clamps symmetrically in both directions. Their VWM (85 V), VBR (94.4–104 V), and VC (137 V) match, but SMAJ85A-M3/5A must be oriented correctly on PCB, whereas SMAJ85CA simplifies layout for AC-coupled or floating lines. The SMAJ85A-M3/5A is preferred for DC rails with defined ground reference.
What is the thermal resistance and maximum junction temperature of SMAJ85A-M3/5A?
SMAJ85A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2"), and a maximum junction temperature (TJ max) of +150 °C. These values govern power derating above 25 °C ambient-per Fig. 2 in Vishay document 88390-and confirm suitability for enclosed industrial enclosures with limited airflow. The SMAJ85A-M3/5A remains within safe operating area under repetitive 400 W surges when thermal design accounts for RθJA.
SMAJ85A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ85A-M3/5A FAQ
1.How can I place an order for SMAJ85A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85A-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 SMAJ85A-M3/5A reliable?
The price and inventory of SMAJ85A-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 SMAJ85A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ85A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85A-M3/5A?
SMAJ85A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85A-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 SMAJ85A-M3/5A?
For technical support, including SMAJ85A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85A-M3/5A requirements.
6.How does Aetrix verify that SMAJ85A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ85A-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 SMAJ85A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ85A-M3/5A?
All SMAJ85A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85A-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 SMAJ85A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ85A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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