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Microchip Technology SMAJ85AE3/TR13
- Part No.:
- SMAJ85AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85AE3/TR13.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ85AE3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for primary overvoltage protection of DC power rails and signal lines. It features a 85 V working peak standoff voltage (VWM), 94.4 V minimum breakdown voltage (VBR), 151 A peak pulse current (IPP) at 10/1000 µs, 137 V maximum 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 SMAJ85AE3/TR13 datasheet, SMAJ85AE3/TR13 pinout, SMAJ85AE3/TR13 application, or SMAJ85AE3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 secondary lightning surge (42 Ω source), low standby leakage (<3.3 µA at 85 V), RoHS-compliant matte-tin plating, and compatibility with automated SMT assembly using EIA-481-1-A tape-and-reel packaging.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 94.4 V breakdown threshold at 1 mA test current. Its <100 ps theoretical response time enables effective suppression of ESD per IEC61000-4-2 (±8 kV contact) and EFT per IEC61000-4-4 (±2 kV), while sustaining 500 W surges at 10/1000 µs waveform without degradation.
Thermal design relies on low junction-to-lead thermal resistance (15 °C/W) and FR4 PCB mounting with recommended footprint; steady-state power dissipation is rated at 5 W at 75 °C lead temperature. The device uses void-free UL94V-0 epoxy encapsulation and C-bend leads compatible with standard reflow profiles up to 260 °C for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min @ IBR | 94.4 V @ 1 mA - Minimum avalanche onset voltage; ensures predictable turn-on above nominal rail. |
| VC @ IPP | 137 V @ 151 A - Maximum clamped voltage during 10/1000 µs surge; determines protected circuit's voltage stress. |
| PPP | 500 W - Peak pulse power handling capability; validates robustness against IEC61000-4-5 Class 3/4 surges. |
| ID @ VWM | ≤3.3 µA - Reverse leakage at full standoff; ensures minimal power loss and no false triggering in high-impedance circuits. |
| tclamping | <100 ps - Theoretical response time; guarantees sub-nanosecond reaction to fast transients like ESD. |
| Operating Temp | −65 °C to +150 °C - Full industrial/automotive ambient range; supports under-hood and outdoor deployment. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free UL94V-0 epoxy body with C-bend matte-tin-plated leads. Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected line | Connected to signal/power line requiring clamping; forms current path to ground during surge. |
| Cathode | High-side connection to ground reference | Connected to system ground plane; provides low-inductance return path for surge current. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse rating | Validates compliance with IEC61000-4-5 secondary lightning (42 Ω source, Class 1–4) and repetitive switching transients. |
| RoHS-compliant "e3" suffix | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; no dry pack required. |
| Unidirectional configuration | Enables asymmetric protection of positive DC rails without forward conduction during normal operation. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A; optimized for high-speed pick-and-place assembly. |
| Low thermal resistance | 15 °C/W junction-to-lead enables reliable power derating on standard FR4 boards with recommended pad layout. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input channels in programmable logic controllers exposed to inductive kickback from solenoid drivers and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and chassis ground to clamp negative-going transients. Use Value: Limits voltage excursion to ≤137 V during 151 A 10/1000 µs surge, preventing damage to upstream signal conditioners and microcontroller GPIOs. | Use Scenario: LIN bus power supply rail in door module electronics subject to load dump and jump-start events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply line downstream of local regulator. Use Value: Withstands 500 W surges while maintaining <3.3 µA leakage at 85 V standoff, ensuring low quiescent current in always-on systems. |
| Telecom Power Supply Input | Medical Diagnostic Equipment Interface |
Use Scenario: Secondary-side 48 V DC output of telecom rectifier subjected to induced RF and lightning-induced surges. IC Role / Device Role / Timing Role: Final-stage TVS on power distribution node feeding sensitive ADC and FPGA power domains. Use Value: Clamps to 137 V within <100 ps, protecting 3.3 V/5 V LDOs and digital ICs rated for ≤16 V absolute maximum. | Use Scenario: Analog sensor interface (e.g., pressure transducer) in portable ultrasound unit connected to external probes. IC Role / Device Role / Timing Role: Signal-line TVS on differential analog inputs referenced to isolated ground. Use Value: Provides IEC61000-4-2 ±8 kV ESD immunity without adding capacitance that degrades 1 MHz bandwidth signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85AHE3/TR13 | Same electrical specs but with enhanced screening (avionics-grade: 10× temp cycling −55 °C to +125 °C, HTRB, surge testing). | Required for aerospace, defense, or high-reliability industrial deployments where extended qualification is mandated. | Select SMAJ85AHE3/TR13 only if MIL-PRF-19500 JANTX or avionics screening is contractually required. |
| SMBJ85A-E3/52 | Same VWM/VC/IPP, but SMB package (DO-214AA) - 2.5 mm wider body, higher thermal mass, 10% larger footprint. | Preferred where board space allows and higher thermal inertia improves long-pulse surge margin (e.g., 100 ms surges). | Choose SMBJ85A-E3/52 if PCB layout permits larger pad area and thermal performance outweighs size constraints. |
Compared with SMAJ85AE3/TR13, the SMAJ85AHE3/TR13 adds avionics-level reliability screening without changing clamping behavior, while the SMBJ85A-E3/52 trades compactness for improved thermal capacity - both require footprint revision and do not offer drop-in replacement.
Availability
SMAJ85AE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power supply input stages requiring stable component supply across multi-year production cycles.
Supply support for SMAJ85AE3/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 harsh environments - emphasizing fast response, repeatable clamping, and robust thermal performance in compact DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ85AE3/TR13 at its rated peak pulse current?
The SMAJ85AE3/TR13 has a maximum clamping voltage (VC) of 137 V when subjected to its rated 151 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is measured per Figure 2 in the official Microsemi datasheet MSC0270A and defines the upper voltage limit imposed on protected circuitry during surge events. Maintaining VC below downstream IC absolute maximum ratings is critical for reliable system-level protection - the SMAJ85AE3/TR13 achieves this while delivering 500 W pulse power handling.
Is SMAJ85AE3/TR13 unidirectional or bidirectional, and how is polarity marked?
SMAJ85AE3/TR13 is a unidirectional TVS diode, meaning it conducts only in reverse bias above its breakdown voltage and blocks forward current. Polarity is marked by a cathode band on the device body - the banded end connects to system ground, while the unbanded end connects to the line being protected. Bidirectional variants use a "C" or "CA" suffix (e.g., SMAJ85CAE3/TR13); the absence of "C" confirms unidirectional operation for SMAJ85AE3/TR13.
Does SMAJ85AE3/TR13 meet IEC61000-4-5 for secondary lightning protection?
Yes, SMAJ85AE3/TR13 is validated for secondary lightning protection per IEC61000-4-5 with 42 Ω source impedance up to Class 1 (full 4 kV test level), and with 12 Ω source impedance up to Class 2 (2 kV test level). Its 500 W peak pulse rating and 137 V clamping voltage ensure compliant energy diversion without failure. The device's <100 ps response time and low leakage (<3.3 µA) further support robust system-level immunity - all parameters confirmed in Microsemi's MSC0270A datasheet for SMAJ85AE3/TR13.
What is the moisture sensitivity level (MSL) and reflow profile compatibility for SMAJ85AE3/TR13?
SMAJ85AE3/TR13 has a moisture sensitivity level (MSL) of Level 1 per IPC/JEDEC J-STD-020B, meaning it is not moisture-sensitive and requires no dry pack or baking prior to assembly. It supports standard lead-free reflow profiles with a maximum solder temperature of 260 °C for 10 seconds. The matte-tin plating and UL94V-0 epoxy body ensure compatibility with automated SMT processes - critical for high-yield manufacturing of products using SMAJ85AE3/TR13 in volume production.
How does the "TR13" suffix in SMAJ85AE3/TR13 affect packaging and ordering?
"TR13" indicates tape-and-reel packaging per EIA-481-1-A standard, with 2500 units per 13-inch reel. This format enables direct integration into high-speed pick-and-place equipment and simplifies inventory management for SMT line feeding. The TR13 variant is the standard production version of SMAJ85AE3/TR13 - distinct from bulk or cut-tape options - and ensures consistent orientation, mechanical stability, and traceability throughout assembly. Aetrix Electronics stocks SMAJ85AE3/TR13 exclusively in TR13 configuration for seamless production deployment.
SMAJ85AE3/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:
- 137V
- Current - Peak Pulse (10/1000µs):
- 3.6A
- 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)
SMAJ85AE3/TR13 FAQ
1.How can I place an order for SMAJ85AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85AE3/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 SMAJ85AE3/TR13 reliable?
The price and inventory of SMAJ85AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ85AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ85AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85AE3/TR13?
SMAJ85AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85AE3/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 SMAJ85AE3/TR13?
For technical support, including SMAJ85AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ85AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ85AE3/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 SMAJ85AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ85AE3/TR13?
All SMAJ85AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85AE3/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 SMAJ85AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ85AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85AE3/TR13 Tags
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