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Microchip Technology SMAJ85CE3/TR13
- Part No.:
- SMAJ85CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85CE3/TR13.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ85CE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for secondary lightning and ESD/EFT protection in power and signal lines. It features 85 V standoff voltage (VWM), 94.4 V minimum breakdown voltage (VBR), 151 A peak pulse current (IPP), 137 V clamping voltage (VC) at 10/1000 µs, and 500 W peak pulse power rating - deployed in telecom power supplies and industrial I/O interfaces.
For engineers reviewing the SMAJ85CE3/TR13 datasheet, SMAJ85CE3/TR13 pinout, SMAJ85CE3/TR13 application, or SMAJ85CE3/TR13 equivalent, key selection criteria include bidirectional clamping behavior, IEC61000-4-5 Class 2 compliance (12 Ω source), RoHS-compliant matte-tin plating, DO-214AC package thermal performance (15 °C/W junction-to-lead), and tape-and-reel packaging for automated assembly.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with clamping initiated when reverse or forward voltage exceeds ±94.4 V (VBR min @ 1 mA). Its sub-5 ns response time enables suppression of fast transients including ESD per IEC61000-4-2 (±8 kV contact) and EFT per IEC61000-4-4 (±2 kV).
Designed for secondary lightning protection per IEC61000-4-5 with 12 Ω source impedance, SMAJ85CE3/TR13 supports Class 2 (up to 1 kV test level) and Class 1 (up to 2 kV) depending on system coupling. Its 137 V clamping voltage limits stress on downstream 100 V-rated MOSFETs or op-amps in DC power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse working voltage before leakage exceeds 1 μA; sets upper limit for protected line voltage. |
| VBR min @ IBR | 94.4 V @ 1 mA - Minimum voltage at which device enters avalanche conduction; defines turn-on threshold under surge. |
| VC @ IPP | 137 V @ 151 A (10/1000 µs) - Clamped voltage during worst-case surge; determines maximum stress on downstream components. |
| PPP | 500 W - Peak pulse power handling capability; validates robustness against repetitive 10/1000 µs surges up to 0.01% duty cycle. |
| IPP | 151 A - Peak surge current capacity at rated VC; confirms suitability for 1 kV/12 Ω IEC61000-4-5 Class 2 testing. |
| TJ Range | –65 °C to +150 °C - Operating junction temperature range; supports deployment in automotive under-hood or industrial motor drive environments. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables thermal design with FR4 PCB using recommended footprint (1 oz Cu). |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case meeting UL94V-0; cathode band omitted for bidirectional configuration; marking reads "85CE3" (SMA prefix omitted per spec); RoHS-compliant matte-tin plating on C-bend leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path terminal | Either lead serves as input or return path; no polarity dependency - enables placement across AC lines or ungrounded differential pairs without orientation check. |
| Case / Body | Thermal mass & mechanical anchor | Wide leads provide low-resistance surge current path and enhance heat dissipation to PCB copper; 0.064 g weight minimizes board stress during thermal cycling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN bus) without external diode pairing. |
| IEC61000-4-5 Class 2 compliance (12 Ω) | Validated for 1 kV surge immunity in industrial control I/O modules where 12 Ω source impedance models typical field wiring coupling. |
| RoHS-compliant "e3" suffix | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; eliminates dry-pack requirement and supports lead-free reflow (260 °C/10 s). |
| 500 W peak pulse rating | Supports repeated surge events in telecom DC power inputs (e.g., -48 V systems) without degradation over 1000+ cycles at 0.01% duty factor. |
| Sub-5 ns response time | Clamps ESD transients faster than IC input protection structures, preventing latch-up or gate oxide damage in microcontrollers and FPGAs. |
Applications
| Industrial PLC Analog Inputs | Telecom -48 V DC Power Rails |
|---|---|
Use Scenario: 4–20 mA current loop inputs exposed to induced surges from nearby motor drives or relay switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp common-mode transients before they reach precision ADC front-end. Use Value: 137 V clamping ensures <100 mV error on 20-bit 5 V reference ADCs; DO-214AC footprint allows compact layout near connector entry point. | Use Scenario: Primary overvoltage protection on -48 V telecom rectifier outputs feeding backplane distribution. IC Role / Device Role / Timing Role: First-line transient suppressor shunting surge energy to chassis ground before it reaches DC/DC converters and PMICs. Use Value: 500 W rating sustains multiple 1 kV/12 Ω surges per IEC61000-4-5 without derating; 151 A IPP prevents fuse blowout during fault conditions. |
| Automotive Body Control Module (BCM) LIN Bus | Medical Patient Monitoring ECG Lead Interfaces |
Use Scenario: LIN bus nodes subjected to load dump and jump-start transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional TVS across LIN data pair to suppress both positive and negative polarity spikes without distorting 19.2 kbps signaling. Use Value: Symmetric clamping preserves signal integrity; 94.4 V VBR avoids false triggering during normal 12 V battery fluctuations. | Use Scenario: High-impedance ECG electrode inputs vulnerable to ESD discharge from patient contact or staff handling. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. 100 pF @ 0 V) placed at connector to divert ±8 kV HBM ESD before reaching instrumentation amplifier inputs. Use Value: Sub-5 ns response prevents amplifier saturation; 1 μA standby current avoids DC offset errors in ultra-low-noise analog front-ends. |
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/TR13 (Microsemi) | Same electrical specs but non-RoHS tin-lead plating; higher moisture sensitivity (Level 2 vs. Level 1). | Not suitable for lead-free assembly; requires dry pack and bake prior to reflow. | Select SMAJ85CE3/TR13 for RoHS-compliant production; choose SMAJ85CA/TR13 only if legacy tin-lead process is mandated. |
| SMBJ85CA (Littelfuse) | Same VWM/VC/IPP, but SMB package (DO-214AA) - 20% larger footprint and 25 °C/W RθJA vs. 80 °C/W for SMAJ. | Lower power density; less suitable for space-constrained 4-layer PCBs with limited copper area. | Prefer SMAJ85CE3/TR13 for high-density layouts; use SMBJ85CA only if existing footprint compatibility is required. |
Compared with SMAJ85CA/TR13, SMAJ85CE3/TR13 offers RoHS compliance and simplified moisture handling, while SMBJ85CA trades smaller thermal resistance for larger board area - making SMAJ85CE3/TR13 optimal for new designs prioritizing environmental compliance and miniaturization.
Availability
SMAJ85CE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, telecom -48 V DC power rails, and automotive LIN bus protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ85CE3/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 and mixed-signal ICs, RF solutions, and discrete protection devices for aerospace, defense, and industrial markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in harsh environments - delivering 500 W surge capability in the compact DO-214AC package for cost-sensitive yet mission-critical power and interface protection.
FAQ
What does the "C" and "E3" suffix indicate in SMAJ85CE3/TR13?
The "C" denotes bidirectional construction, enabling symmetrical clamping across both polarities - critical for AC lines or floating interfaces. The "E3" suffix specifies RoHS-compliant matte-tin plating per JEDEC J-STD-020B Level 1, eliminating dry-pack requirements and supporting lead-free reflow at 260 °C for 10 seconds. SMAJ85CE3/TR13 thus combines polarity-agnostic protection with modern assembly compatibility.
Is SMAJ85CE3/TR13 suitable for IEC61000-4-5 testing with 42 Ω source impedance?
No - SMAJ85CE3/TR13 is rated for IEC61000-4-5 Class 2 with 12 Ω source impedance (up to 1 kV), not 42 Ω. At 42 Ω, its 151 A IPP supports only Class 4 (≤0.5 kV) per the datasheet's classification table. For 42 Ω Class 2 (1 kV), a higher IPP device like SMAJ100CE3/TR13 (179 A) is required. SMAJ85CE3/TR13 remains valid for 12 Ω-based industrial field-wiring surge models.
What is the clamping voltage of SMAJ85CE3/TR13 under a 10/1000 µs surge?
The maximum clamping voltage (VC) of SMAJ85CE3/TR13 is 137 V when subjected to its rated 151 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is measured at TJ = 25 °C and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring downstream 100 V-rated components remain within safe operating area.
Can SMAJ85CE3/TR13 be used in place of a unidirectional TVS like SMAJ85A?
No - SMAJ85CE3/TR13 is bidirectional and lacks polarity marking, while SMAJ85A is unidirectional with cathode banding and forward surge capability (40 A, 8.3 ms). Replacing SMAJ85A with SMAJ85CE3/TR13 in DC circuits risks improper clamping directionality and forfeits forward surge rating. SMAJ85CE3/TR13 is appropriate only where symmetrical protection is needed, such as AC lines or differential buses.
What is the thermal resistance of SMAJ85CE3/TR13 when mounted on FR4?
SMAJ85CE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 15 °C/W and a junction-to-ambient resistance (RθJA) of 80 °C/W when mounted on FR4 with 1 oz copper and the manufacturer-recommended pad layout. This means 1 W of steady-state power dissipation raises junction temperature by 15 °C above lead temperature - essential for calculating safe derating in high-temperature enclosures or stacked PCB assemblies where airflow is restricted.
SMAJ85CE3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ85CE3/TR13 FAQ
1.How can I place an order for SMAJ85CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85CE3/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 SMAJ85CE3/TR13 reliable?
The price and inventory of SMAJ85CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ85CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85CE3/TR13?
SMAJ85CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85CE3/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 SMAJ85CE3/TR13?
For technical support, including SMAJ85CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ85CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ85CE3/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 SMAJ85CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ85CE3/TR13?
All SMAJ85CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85CE3/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 SMAJ85CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ85CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85CE3/TR13 Tags
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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