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Microchip Technology SMAJ8.5E3/TR13
- Part No.:
- SMAJ8.5E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5E3/TR13.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,389
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Product details
Overview
SMAJ8.5E3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for primary and secondary surge protection in DC power rails and signal lines. It features a 8.5 V working peak standoff voltage (VWM), 9.44 V minimum breakdown voltage (VBR), 15.9 V maximum clamping voltage (VC) at 31.4 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - used in industrial power supplies, automotive ECUs, and telecom interface circuits.
For engineers reviewing the SMAJ8.5E3/TR13 datasheet, SMAJ8.5E3/TR13 pinout, SMAJ8.5E3/TR13 application, or SMAJ8.5E3/TR13 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, standoff voltage compatibility with nominal rail voltage (e.g., 5 V or 9 V systems), IEC 61000-4-2/4-4/4-5 compliance level, and thermal dissipation capability on FR4 PCBs with recommended footprint.
Technical Context
This TVS operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response (<100 ps theoretical turn-on) and low clamping ratio (VC/VBR ≈ 1.69). Its DO-214AC (SMA) package provides 15 °C/W junction-to-lead thermal resistance when soldered to copper pads, enabling reliable energy absorption during repetitive transients up to 0.01% duty cycle.
The device meets IEC 61000-4-2 Level 4 ESD (±15 kV air/±8 kV contact), IEC 61000-4-4 EFT (40 A, 5/50 ns), and IEC 61000-4-5 secondary lightning surge (42 Ω source, Class 4 up to 12 V VWM). Standby leakage current is ≤1 µA at 8.5 V, ensuring minimal impact on low-power sensor or battery-backed circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 8.5 V - Maximum continuous DC or RMS voltage the device blocks without conduction; matches 9 V nominal rails with 5.6% margin. |
| VBR (Min @ IBR) | 9.44 V @ 1 mA - Guaranteed avalanche initiation threshold; ensures predictable turn-on before downstream IC damage. |
| VC @ IPP | 15.9 V @ 31.4 A - Clamped voltage during 10/1000 µs surge; must stay below protected IC's absolute max rating (e.g., <16 V for 3.3 V logic I/O). |
| PPP | 500 W - Peak pulse power handling per standard waveform; defines single-event surge survivability under defined test conditions. |
| ID @ VWM | ≤1 µA - Ultra-low leakage at rated standoff; avoids loading of high-impedance analog or battery-monitoring nodes. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.216" max body width; compatible with automated pick-and-place and reflow. |
| Operating Temp | –65 °C to +150 °C - Supports under-hood automotive, industrial control, and outdoor telecom deployments. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case, void-free, UL94V-0 rated; C-bend leads with RoHS-compliant matte-tin plating; cathode indicated by band; weight 0.064 g; moisture sensitivity level (MSL) 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground or return path | Provides low-impedance surge shunt path to ground; must be routed with minimal inductance to preserve clamping performance. |
| Cathode | High-side connection to protected line (e.g., VIN, signal) | Connected upstream of sensitive load; polarity marking ensures correct orientation to avoid reverse conduction during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Enables robust protection against IEC 61000-4-5 secondary lightning surges (e.g., 1 kV/42 Ω) without degradation over rated lifetime. |
| 15.9 V clamping at 31.4 A | Provides 7.4 V headroom above 8.5 V rail - sufficient to protect 12 V tolerant interfaces while avoiding false triggering. |
| ≤1 µA standby leakage | Preserves battery life in always-on IoT sensors and enables use on high-Z analog inputs without signal offset or drift. |
| DO-214AC (SMA) package | Offers proven thermal performance (15 °C/W junc-to-lead) and compatibility with standard SMT assembly processes and IPC-7351 footprints. |
| IEC 61000-4-2/4-4/4-5 compliant | Validated for system-level ESD (±8 kV contact), EFT (40 A), and surge immunity - reduces need for additional board-level validation effort. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24 V DC input stage of PLC I/O module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients before they reach DC-DC converter input. Use Value: Limits clamped voltage to 15.9 V - well below 36 V absolute max rating of typical buck controller ICs, preventing latch-up or gate oxide damage. | Use Scenario: LIN bus transceiver power supply line in door module subjected to ISO 7637-2 Pulse 1/2a/3a. IC Role / Device Role / Timing Role: Primary surge suppression on 12 V VCC rail feeding LIN PHY ICs and microcontroller peripherals. Use Value: Withstands 31.4 A peak pulse at 10/1000 µs - exceeds ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 2 Ω series) worst-case current into protected node. |
| Telecom Ethernet PHY Interface | Medical Sensor Signal Conditioning |
Use Scenario: 3.3 V bias rail for Ethernet magnetics center tap in PoE-powered access point. IC Role / Device Role / Timing Role: Secondary protection after common-mode choke, guarding PHY IC power pins against ESD coupling via magnetics. Use Value: 1 µA leakage ensures no measurable impact on 3.3 V rail regulation or PHY reference stability during idle operation. | Use Scenario: 5 V analog front-end supply for ECG amplifier in portable diagnostic device. IC Role / Device Role / Timing Role: Low-leakage TVS on precision analog supply to prevent ESD-induced offset shift or amplifier saturation. Use Value: Clamping at 15.9 V prevents overvoltage stress on 5 V LDO output capacitor and maintains amplifier CMRR integrity during ±8 kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A | Same VWM, VBR, VC, and PPP; non-RoHS tin-lead plating; no "e3" suffix; TR13 tape/reel not standard. | Not suitable for RoHS-compliant production; requires lead-free reflow profile validation if substituted. | Select SMAJ8.5A only for legacy non-RoHS designs or where tin-lead soldering is mandated. |
| SMBJ8.5A | Same electrical specs but SMB (DO-214AA) package - 20% larger footprint, 10% higher thermal resistance (18 °C/W). | Lower power density; less suitable for space-constrained layouts; better for higher-reliability thermal cycling environments. | Choose SMBJ8.5A when board layout allows larger pad area and thermal management prioritizes long-term reliability over miniaturization. |
Compared with SMAJ8.5A and SMBJ8.5A, SMAJ8.5E3/TR13 delivers RoHS compliance, optimized DO-214AC thermal performance, and standardized 13-inch tape-and-reel packaging - making it the preferred choice for high-volume, lead-free SMT manufacturing targeting industrial and automotive end equipment.
Availability
SMAJ8.5E3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom Ethernet PHY interfaces, and medical sensor signal conditioning requiring stable component supply across extended temperature ranges and regulatory-compliant manufacturing.
Supply support for SMAJ8.5E3/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 developed specifically for surface-mount transient suppression in harsh-environment electronics, emphasizing fast response, repeatable clamping, and robust thermal performance in compact DO-214AC packages.
FAQ
What is the clamping voltage of SMAJ8.5E3/TR13 and why does it matter?
The SMAJ8.5E3/TR13 has a maximum clamping voltage (VC) of 15.9 V at 31.4 A peak pulse current (10/1000 µs). This value defines the highest voltage that will appear across the protected circuit during a surge event. It matters because it must remain safely below the absolute maximum voltage rating of downstream ICs - for example, ensuring 15.9 V stays under the 16 V limit of many 12 V-tolerant interface ICs. Exceeding this clamping voltage risks permanent damage to sensitive components.
Is SMAJ8.5E3/TR13 RoHS compliant and what does the "e3" suffix indicate?
Yes, SMAJ8.5E3/TR13 is RoHS compliant. The "e3" suffix explicitly denotes Microsemi's RoHS-compliant version with annealed matte-tin plating on the leads, meeting EU Directive 2011/65/EU requirements. This ensures compatibility with lead-free reflow soldering profiles (up to 260 °C for 10 s) and eliminates hexavalent chromium, cadmium, lead, mercury, PBB, and PBDE substances - critical for export-controlled and consumer-facing electronics.
How does the DO-214AC package of SMAJ8.5E3/TR13 affect thermal performance?
The DO-214AC (SMA) package of SMAJ8.5E3/TR13 provides a junction-to-lead thermal resistance of 15 °C/W when mounted on FR4 with recommended footprint. This enables efficient heat transfer from the silicon die to the PCB copper, supporting repeated 500 W surge events without thermal runaway. Compared to smaller SOD-123 packages, DO-214AC offers ~3× higher thermal mass and lower inductance - preserving clamping speed and energy-handling capability in real-world layouts.
Can SMAJ8.5E3/TR13 be used for bidirectional protection?
No, SMAJ8.5E3/TR13 is a unidirectional TVS, as confirmed by its part number lacking a "C" or "CA" suffix and its cathode-band polarity marking. Bidirectional variants (e.g., SMAJ8.5CA) exist in the same family but feature symmetrical breakdown in both directions and no polarity marking. Using SMAJ8.5E3/TR13 on AC-coupled or floating signal lines would result in unintended conduction during negative half-cycles - select SMAJ8.5CA only for true bidirectional applications like RS-485 or USB D+/D− lines.
What IEC standards does SMAJ8.5E3/TR13 meet and how are they verified?
SMAJ8.5E3/TR13 meets IEC 61000-4-2 (ESD ±8 kV contact), IEC 61000-4-4 (EFT 40 A), and IEC 61000-4-5 (surge 1 kV/42 Ω Class 4) per manufacturer characterization. These ratings are verified through standardized waveforms applied directly to the device terminals - not system-level testing - and documented in Microsemi's MSC0270A datasheet. System-level compliance requires proper PCB layout (short traces, low-inductance grounding) and may necessitate additional filtering depending on end-equipment class requirements.
SMAJ8.5E3/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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 31.4A
- 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)
SMAJ8.5E3/TR13 FAQ
1.How can I place an order for SMAJ8.5E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5E3/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 SMAJ8.5E3/TR13 reliable?
The price and inventory of SMAJ8.5E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5E3/TR13?
SMAJ8.5E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5E3/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 SMAJ8.5E3/TR13?
For technical support, including SMAJ8.5E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5E3/TR13 requirements.
6.How does Aetrix verify that SMAJ8.5E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5E3/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 SMAJ8.5E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5E3/TR13?
All SMAJ8.5E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5E3/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 SMAJ8.5E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ8.5E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5E3/TR13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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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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