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Microchip Technology SMAJ85E3/TR13
- Part No.:
- SMAJ85E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85E3/TR13.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
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Product details
Overview
SMAJ85E3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) designed for primary and secondary lightning surge protection in DC power rails and signal lines. It features 85 V working standoff voltage (VWM), 94.4 V minimum breakdown voltage (VBR), 151 A peak pulse current (IPP) at 10/1000 µs, 137 V clamping voltage (VC), and 500 W peak pulse power dissipation - deployed in telecom power supplies, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ85E3/TR13 datasheet, SMAJ85E3/TR13 pinout, SMAJ85E3/TR13 application, or SMAJ85E3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 (42 Ω source), unidirectional polarity marking, RoHS-compliant matte-tin plating, DO-214AC package thermal resistance (15 °C/W junction-to-lead), and tape-and-reel packaging (TR13 = 2500 pcs/reel).
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR (94.4 V min @ 1 mA), it avalanches into low-impedance conduction to divert surge current to ground. Its <100 ps theoretical response time enables effective ESD suppression per IEC61000-4-2 Level 4 (±15 kV air/±8 kV contact) and EFT protection per IEC61000-4-4.
Thermal design relies on its 15 °C/W junction-to-lead thermal resistance and 5 W steady-state power rating at 75 °C lead temperature. The device is rated for -65 °C to +150 °C operating/storage temperature and withstands 260 °C soldering for 10 s - validated for FR4 PCB mounting with recommended footprint per Microsemi MSC0270A Rev L.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC rail margin. |
| VBR min | 94.4 V @ 1 mA - guaranteed avalanche initiation threshold; ensures predictable turn-on during transients. |
| VC @ IPP | 137 V @ 151 A (10/1000 µs) - clamped voltage seen by protected circuit; determines downstream component voltage stress. |
| PPP | 500 W - peak surge power handling capability; supports IEC61000-4-5 Class 1–4 secondary lightning testing. |
| IPP | 151 A - maximum non-destructive surge current; defines minimum trace width and grounding path requirements. |
| Leakage ID | 3.3 μA @ 85 V - standby current at VWM; negligible impact on low-power system quiescent consumption. |
| tclamp | <100 ps (theoretical) - ultrafast response enables protection of high-speed logic and analog interfaces. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case meeting UL94V-0; cathode indicated by band; weight 0.064 g; moisture sensitivity level (MSL) 1 - no dry pack required per J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current return path | Connected to protected line (e.g., +12 V rail); must route with low-inductance path to ground plane. |
| Cathode | Surge current sink | Connected to system ground; marked by band; requires robust ground via placement near device. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant matte-tin plating | Enables lead-free reflow compatibility (260 °C/10 s) without intermetallic degradation or dewetting. |
| DO-214AC thermal performance | 15 °C/W junction-to-lead resistance allows sustained 5 W dissipation at TL = 75 °C with standard FR4 layout. |
| IEC61000-4-5 compliance | Validated for secondary lightning protection up to Class 4 (42 Ω source) - supports EN 50121-4 railway and IEC 61850 substation equipment. |
| Unidirectional construction | Provides asymmetric clamping: low VC during positive surges, open-circuit blocking during negative transients - ideal for DC-biased lines. |
Applications
| Industrial PLC Analog Inputs | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 0–10 V or 4–20 mA sensor inputs exposed to load dump and inductive kickback in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional shunt clamp protecting precision ADC front-end and op-amp buffers from >100 V transients. Use Value: Limits input voltage to ≤137 V during 151 A surges, preserving 16-bit measurement accuracy and avoiding op-amp saturation recovery delay. | Use Scenario: 12 V battery-supplied microcontroller I/O lines subjected to ISO 7637-2 Pulse 1/2a/3a and ESD events in door module assemblies. IC Role / Device Role / Timing Role: Primary overvoltage clamp on LIN bus and switch sense inputs, placed within 2 mm of connector entry point. Use Value: Sub-100 ps response prevents latch-up in 3.3 V MCU GPIOs; 3.3 μA leakage avoids battery drain in sleep mode. |
| Telecom Power Supply DC Output | Smart Meter RS-485 Interface |
Use Scenario: +48 V DC output rail of AC/DC converter in outdoor base station power systems subject to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary surge suppressor downstream of bulk MOV, clamping residual transients before DC-DC converters. Use Value: 500 W peak power rating handles repetitive 10/1000 µs surges without derating; 137 V clamping protects 60 V-rated MOSFETs and controllers. | Use Scenario: RS-485 transceiver data lines in utility smart meters installed on overhead distribution lines vulnerable to induced surges. IC Role / Device Role / Timing Role: Line-side TVS on A/B differential pair, mounted with symmetric trace lengths to preserve common-mode rejection. Use Value: 151 A IPP withstands IEC61000-4-5 42 Ω source tests; bidirectional alternatives not needed due to DC bias on RS-485 bus. |
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-E3/5A (Vishay) | Identical VWM (85 V), VBR (94.4 V min), VC (137 V), and IPP (151 A); same DO-214AC package and RoHS plating. | No functional difference; qualified to AEC-Q200 Grade 2 (-40 °C to +105 °C) but not extended temp range (-65 °C to +150 °C). | Select SMAJ85A-E3/5A only if automotive qualification is required and extended temperature operation is unnecessary. |
| SMCJ85A (Microchip) | Same VWM and VBR, but higher PPP (1500 W) and IPP (333 A); larger DO-214AB (SMB) package with 10.3 mm length vs. 4.5 mm for SMAJ. | Requires PCB layout change; suited for higher-energy surges where 500 W is marginal, e.g., main AC input stages. | Choose SMCJ85A only when surge energy exceeds SMAJ85E3/TR13's 500 W rating and board space permits SMB footprint. |
Compared with SMAJ85A-E3/5A, SMAJ85E3/TR13 offers broader temperature support (-65 °C to +150 °C) critical for aerospace and downhole applications; versus SMCJ85A, it delivers identical clamping performance in 40% smaller footprint - enabling dense I/O protection without sacrificing surge margin.
Availability
SMAJ85E3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive BCMs, telecom power supply outputs, and smart meter RS-485 interfaces requiring stable component supply across long-lifecycle programs.
Supply support for SMAJ85E3/TR13 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments - balancing 500 W power handling, ultrafast response, and MSL-1 manufacturability in DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ85E3/TR13 at its rated peak pulse current?
The SMAJ85E3/TR13 has a maximum clamping voltage (VC) of 137 V when subjected to its rated 151 A peak pulse current (IPP) under the 10/1000 µs waveform. This value is measured per Figure 2 in Microsemi MSC0270A Rev L and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ85E3/TR13 unidirectional or bidirectional, and how is polarity identified?
SMAJ85E3/TR13 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" in its part number suffix. Polarity is marked by a cathode band on the device body; the banded end connects to system ground, while the anode connects to the line being protected. This configuration provides low-impedance clamping for positive transients only - essential for DC-biased applications like power rails and sensor inputs.
What IEC standards does SMAJ85E3/TR13 comply with for surge and ESD protection?
SMAJ85E3/TR13 is verified for compliance with IEC61000-4-2 (ESD immunity up to ±15 kV air/±8 kV contact), IEC61000-4-4 (EFT immunity up to 4 kV), and IEC61000-4-5 (surge immunity up to Class 4 with 42 Ω source impedance). These validations are documented in Microsemi's application guidance for the SMAJ5.0–170CA family and confirm suitability for industrial, telecom, and automotive EMC test plans.
What is the thermal resistance and steady-state power rating of SMAJ85E3/TR13?
SMAJ85E3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and a steady-state power dissipation rating of 5 W at a lead temperature (TL) of 75 °C. When mounted on FR4 with 1 oz copper and Microsemi's recommended footprint, it dissipates 1.56 W at ambient 25 °C - enabling reliable operation in thermally constrained enclosures without forced airflow.
Does SMAJ85E3/TR13 require moisture-sensitive handling or dry packing before reflow?
No - SMAJ85E3/TR13 is rated MSL Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life and does not require dry pack storage or baking prior to reflow soldering. Its void-free epoxy package and matte-tin plating ensure robustness against moisture absorption, simplifying manufacturing logistics and reducing assembly risk.
SMAJ85E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- 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:
- 151V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ85E3/TR13 FAQ
1.How can I place an order for SMAJ85E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85E3/TR13 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 SMAJ85E3/TR13 reliable?
The price and inventory of SMAJ85E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ85E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85E3/TR13?
SMAJ85E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85E3/TR13 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 SMAJ85E3/TR13?
For technical support, including SMAJ85E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85E3/TR13 requirements.
6.How does Aetrix verify that SMAJ85E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ85E3/TR13 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 SMAJ85E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ85E3/TR13?
All SMAJ85E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85E3/TR13, 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 SMAJ85E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ85E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85E3/TR13 Tags
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