My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ85A-M3/61
- Part No.:
- SMAJ85A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85A-M3/61.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ85A-M3/61 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMAJ85A-M3/61 datasheet, SMAJ85A-M3/61 pinout, SMAJ85A-M3/61 application, or SMAJ85A-M3/61 equivalent, key selection criteria include its unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, halogen-free RoHS-compliant construction (M3 suffix), and AEC-Q101 qualification eligibility via HM3 variant - critical for ESD and load-switching surge protection in high-reliability embedded systems.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (<1 μA leakage at 85 V), then avalanches within picoseconds when transient voltage exceeds VBR, clamping the line to ≤137 V while diverting up to 2.2 A peak surge current. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
The device is rated for repetitive 10/1000 μs pulses at 0.01% duty cycle (400 W up to 78 V; derated to 300 W above 78 V), with maximum operating junction temperature of +150 °C and storage range from –55 °C to +150 °C. Mounting on 5.0 mm × 5.0 mm copper pads per terminal is required to achieve specified power ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - guaranteed avalanche initiation range; determines minimum overvoltage threshold for protection activation |
| VC @ IPPM | 137 V at 2.2 A - clamped voltage during 10/1000 μs surge; directly limits stress on downstream components |
| PPPM | 400 W - peak pulse power handling (≤78 V); defines transient energy absorption capability without failure |
| IFSM | 40 A - non-repetitive forward surge current (8.3 ms half-sine); supports inrush or fault-current tolerance in power rails |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient; requires PCB copper area design to maintain TJ ≤ 150 °C under sustained dissipation |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking; compatible with automated pick-and-place |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak). Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts avalanche current to ground or lower-potential rail during overvoltage event |
| Anode (unbanded end) | Reference potential node | Typically tied to GND or common return path; completes shunt path for surge current diversion |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3/4 surges without derating in standard PCB layouts |
| 137 V clamping voltage at 2.2 A | Limits voltage overshoot across protected ICs or MOSFETs during 1000 V/0.5 Ω surge events |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime; eliminates parameter drift under repeated transient stress |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and environmental compliance for global OEM production |
| AEC-Q101 qualification path (HM3 variant) | Supports automotive-grade reliability validation including HTGB, HTRB, and temperature cycling for engine control modules |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients (ISO 16750-2) and alternator switching spikes. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between power input and ground, responding within <1 ps to limit voltage to ≤137 V. Use Value: Prevents latch-up or gate oxide damage in microcontrollers and CAN transceivers during 120 V/100 ms load dump events. |
Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I/O (RS-485, LIN) in factory automation sensors exposed to motor switching noise. IC Role / Device Role / Timing Role: Line-side TVS on signal traces, absorbing inductive kickback from solenoid drivers and relay coils. Use Value: Maintains signal integrity by clamping transients to <137 V while adding <1 pF capacitance - no data corruption or false triggering. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters after rectification, guarding against transformer flyback spikes. IC Role / Device Role / Timing Role: Unidirectional TVS connected between +VOUT and GND, activated only during positive-going surges. Use Value: Absorbs 400 W pulses without degradation, enabling compact adapter designs meeting UL 62368-1 surge immunity requirements. |
Use Scenario: DC power feed protection in PoE-powered network switches and base stations against lightning-induced surges on 48 V supply lines. IC Role / Device Role / Timing Role: Primary-stage shunt device on PSE output, clamping induced transients before reaching PD controller ICs. Use Value: Withstands 2.2 A peak current at 137 V clamping, ensuring uninterrupted operation during IEC 61000-4-5 combination wave tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/61 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Approved for commercial-grade industrial equipment where halogen-free requirement is not mandated | Select for cost-sensitive non-automotive applications with standard RoHS compliance |
| SMAJ85AHM3/61 | Identical electrical and mechanical specs; adds AEC-Q101 qualification and halogen-free construction | Required for automotive subsystems (e.g., body control modules) needing full automotive reliability certification | Select when automotive qualification and halogen-free materials are mandatory per OEM specification |
Compared with SMAJ85A-M3/61, the E3 variant trades halogen-free content for lower cost in commercial use, while the HM3 variant adds AEC-Q101 validation - making it suitable for automotive deployment without changing layout or circuit function.
Availability
SMAJ85A-M3/61 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom power supplies requiring stable component supply, halogen-free compliance, and repeatable surge performance across production batches.
Supply support for SMAJ85A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ85A-M3/61 under surge conditions?
The SMAJ85A-M3/61 has a maximum clamping voltage (VC) of 137 V at 2.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuits during transient events. The SMAJ85A-M3/61 maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Does the SMAJ85A-M3/61 meet automotive qualification standards?
The SMAJ85A-M3/61 itself is not AEC-Q101 qualified; however, the functionally identical SMAJ85AHM3/61 variant carries full AEC-Q101 qualification. The SMAJ85A-M3/61 shares the same electrical characteristics, package, and halogen-free RoHS compliance, making it suitable for commercial and industrial applications where automotive certification is not required. For automotive use, specify SMAJ85AHM3/61.
What is the thermal resistance and how does it affect PCB layout for the SMAJ85A-M3/61?
The SMAJ85A-M3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To avoid exceeding the 150 °C maximum junction temperature during repetitive surges, PCB layout must provide adequate copper area and thermal vias. Reducing pad size or omitting thermal relief increases RθJA, risking thermal runaway under sustained power dissipation.
How does the SMAJ85A-M3/61 differ from bidirectional TVS diodes like SMAJ85CA?
The SMAJ85A-M3/61 is unidirectional and functions only during positive voltage transients relative to its cathode; it blocks reverse voltage up to 85 V but conducts forward surges. In contrast, SMAJ85CA is bidirectional and protects both polarities symmetrically - useful for AC lines or differential signals. The SMAJ85A-M3/61 offers lower leakage and tighter VBR tolerance in DC applications where polarity is fixed, such as 12 V or 48 V power rails.
What is the meaning of the "M3" and "/61" suffixes in SMAJ85A-M3/61?
The "M3" suffix denotes halogen-free, RoHS-compliant construction per IPC-1752A, with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. The "/61" indicates packaging in 7-inch diameter plastic tape and reel, with 1800 units per reel - optimized for high-speed SMT assembly. Both identifiers are integral to the orderable part number SMAJ85A-M3/61 and define material compliance and logistics format.
SMAJ85A-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:
- 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-M3/61 FAQ
1.How can I place an order for SMAJ85A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85A-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 SMAJ85A-M3/61 reliable?
The price and inventory of SMAJ85A-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 SMAJ85A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ85A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85A-M3/61?
SMAJ85A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85A-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 SMAJ85A-M3/61?
For technical support, including SMAJ85A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85A-M3/61 requirements.
6.How does Aetrix verify that SMAJ85A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ85A-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 SMAJ85A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ85A-M3/61?
All SMAJ85A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85A-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 SMAJ85A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ85A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85A-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 …
