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Microchip Technology SMAJ170E3/TR13
- Part No.:
- SMAJ170E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170E3/TR13.pdf
- Description:
- TVS DIODE 170VWM 304VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,383
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Product details
Overview
SMAJ170E3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in DO-214AC (SMA) package, rated for 500 W peak pulse power at 10/1000 µs, with 170 V standoff voltage (VWM), 189 V minimum breakdown voltage (VBR), and 304 V clamping voltage (VC) at 2.75 A peak pulse current - used to protect power rails and I/O lines in industrial motor drives against lightning-induced surges and EFT.
For engineers reviewing the SMAJ170E3/TR13 datasheet, SMAJ170E3/TR13 pinout, SMAJ170E3/TR13 application, or SMAJ170E3/TR13 equivalent, key selection considerations include its 170 V working voltage compatibility with 150–200 V DC bus systems, RoHS-compliant matte-tin plating, tape-and-reel packaging (TR13 = 2500 pcs/reel), and compliance with IEC61000-4-5 (secondary lightning, 42 Ω source) Class 1.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias (≤170 V), it draws ≤1.6 µA standby current; when transient voltage exceeds 189 V (VBR min @ 1 mA), it avalanches rapidly (<100 ps theoretical response) to clamp the line at ≤304 V. Its thermal resistance is 15 °C/W junction-to-lead, enabling reliable 5 W steady-state dissipation at 75 °C lead temperature.
The device uses a void-free thermosetting epoxy case (UL94V-0), C-bend leads with annealed matte-tin plating per MIL-STD-750 Method 2026, and is moisture-sensitive Level 1 (no dry pack required). It supports 260 °C soldering for 10 s and operates across –65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 500 W at 10/1000 µs waveform - sustains single high-energy transients without failure in industrial power interfaces. |
| Standoff Voltage (VWM) | 170 V - maximum continuous reverse operating voltage before leakage exceeds 1.6 µA; matches 150–200 V DC bus rails. |
| Breakdown Voltage (VBR) | 189 V min @ 1 mA - precise avalanche initiation threshold ensures predictable clamping onset. |
| Clamping Voltage (VC) | 304 V @ 2.75 A - limits transient overvoltage to safe levels for downstream 350 V-rated MOSFETs or gate drivers. |
| Leakage Current (ID) | ≤1.6 µA @ 170 V - negligible power loss and signal integrity impact on high-impedance sensing or control lines. |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with wide leads for low thermal resistance (15 °C/W) and robust PCB mounting. |
| RoHS Compliance | e3 suffix - lead-free matte-tin plating compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-020B Level 1. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case, cathode indicated by band on body, C-bend leads, 0.064 g weight. Recommended pad layout per Microsemi MSC0270A Rev L: 6.22 mm × 1.90 mm pad length × width, 2.39 mm center-to-center spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path to ground or low-side reference | Connected to system ground or negative rail; carries full surge current during clamping event. |
| Cathode | Protected line input / high-side connection | Connected to line being protected (e.g., DC bus); polarity marking ensures correct orientation for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse rating | Enables protection against severe IEC61000-4-5 lightning surges (42 Ω source, Class 1) without derating in compact SMA footprint. |
| 170 V standoff with tight VBR/VWM ratio (1.11) | Minimizes margin between operating voltage and clamping threshold - improves protection headroom for 150–200 V systems. |
| <100 ps theoretical response time | Clamps ESD and fast-switching transients before sensitive ICs experience overstress - critical for gate driver and MCU I/O protection. |
| Moisture sensitivity Level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and process complexity. |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel - optimized for automated SMT placement and consistent inventory replenishment in high-volume production. |
Applications
| Industrial Motor Drive DC Bus Protection | Telecom Power Supply Input Stage |
|---|---|
Use Scenario: 170 V DC bus in variable-frequency drives exposed to inductive kickback and utility switching transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between bus+ and ground to clamp positive-going surges. Use Value: Limits transient voltage to ≤304 V, protecting 350 V-rated IGBT gate drivers and bus capacitors from cumulative degradation. |
Use Scenario: –48 V telecom rectifier output feeding distributed power architecture with long PCB traces. IC Role / Device Role / Timing Role: Reverse-polarity TVS on output rail to suppress load-dump spikes and hot-swap transients. Use Value: Withstands 500 W surges while maintaining <1.6 µA leakage - avoids false triggering of upstream OVP circuits. |
| Automotive Body Control Module (BCM) Power Input | Renewable Energy Inverter DC Link |
Use Scenario: 12 V/24 V BCM supply subjected to ISO 7637-2 pulse 1 (inductive load dump) and pulse 3a/b (switching noise). IC Role / Device Role / Timing Role: Primary clamping device on main power input, upstream of DC-DC converters. Use Value: Fast <100 ps response captures sub-microsecond edges of pulse 3b, preventing latch-up in microcontroller power domains. |
Use Scenario: 600 V DC link in solar string inverters experiencing grid fault-induced voltage overshoot. IC Role / Device Role / Timing Role: Secondary-level TVS on auxiliary monitoring rails (e.g., voltage sense dividers) referenced to 170 V intermediate bus. Use Value: 170 V VWM enables direct integration into 150–200 V auxiliary supplies without series resistors or voltage dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ170AHE3/A | Same DO-214AC package, identical VWM/VBR/VC, but rated for 100% surge screening per MIL-PRF-19500 JANTX (not standard for SMAJ170E3/TR13). | Preferred where extended temperature cycling (–55 °C to +125 °C, 10×) and HTRB validation are mandated for avionics or defense programs. | Select SMAJ170AHE3/A if MIL-spec screening is contractually required; otherwise SMAJ170E3/TR13 offers equivalent electrical performance at lower cost. |
| Vishay SMAJ170A-M3/86A | Identical electrical specs and DO-214AC package, but uses matte-tin plating qualified to IPC-J-STD-006B rather than MIL-STD-750 Method 2026. | Suitable for commercial/industrial applications where RoHS compliance and reflow compatibility are primary concerns, not military-grade plating adhesion. | Choose SMAJ170A-M3/86A for high-volume consumer electronics where Vishay's supply chain and logistics integration provide advantage. |
Compared with Littelfuse SMAJ170AHE3/A and Vishay SMAJ170A-M3/86A, SMAJ170E3/TR13 delivers identical clamping performance and RoHS compliance but differs in screening level and plating qualification - making it optimal for cost-sensitive industrial designs requiring proven reliability without MIL-spec overhead.
Availability
SMAJ170E3/TR13 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and renewable energy inverters requiring stable component supply and verified surge immunity.
Supply support for SMAJ170E3/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 components for aerospace, defense, and industrial markets.
The SMAJ series was designed specifically for surface-mount transient suppression in harsh environments - delivering 500 W surge capability in the compact DO-214AC footprint for space-constrained power electronics.
FAQ
What is the clamping voltage of SMAJ170E3/TR13 at its rated peak pulse current?
The SMAJ170E3/TR13 has a maximum clamping voltage (VC) of 304 V at 2.75 A peak pulse current (IPP) under the 10/1000 µs waveform. This value is measured per Microsemi MSC0270A Rev L and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The SMAJ170E3/TR13 maintains this clamping performance across its specified operating temperature range.
Is SMAJ170E3/TR13 unidirectional or bidirectional, and how is polarity marked?
SMAJ170E3/TR13 is a unidirectional TVS diode, with cathode indicated by a visible band on the body. The "E3" suffix confirms RoHS-compliant matte-tin plating, and the absence of "C" or "CA" in the part number confirms unidirectional construction. Bidirectional variants (e.g., SMAJ170CAE3) use symmetric breakdown in both directions and omit polarity marking.
What is the maximum steady-state power dissipation for SMAJ170E3/TR13 on a standard FR4 board?
When mounted on an FR4 PCB with 1 oz copper and Microsemi's recommended footprint, SMAJ170E3/TR13 dissipates up to 5 W continuously at a lead temperature (TL) of 75 °C, or 1.56 W at ambient temperature (TA) of 25 °C. These values derive from its 15 °C/W junction-to-lead thermal resistance and are validated per MSC0270A Rev L.
Does SMAJ170E3/TR13 meet IEC61000-4-5 for lightning surge immunity?
Yes, SMAJ170E3/TR13 is rated for secondary lightning protection per IEC61000-4-5 with 42 Ω source impedance at Class 1 level (up to SMAJ100A/CA), and with 12 Ω source impedance at Class 1 up to SMAJ30A/CA. Its 500 W peak pulse rating and 304 V clamping voltage directly support compliance in these test configurations when properly laid out.
What does the "TR13" suffix indicate in SMAJ170E3/TR13?
The "TR13" suffix denotes tape-and-reel packaging: 2500 units per 13-inch reel, conforming to EIA-481-1-A standards with 12 mm carrier tape width. This format enables automated pick-and-place assembly and is distinct from "TR" (750 pcs/reel) or bulk options. The SMAJ170E3/TR13 part number explicitly identifies this configuration for procurement and logistics tracking.
SMAJ170E3/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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 304V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- 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)
SMAJ170E3/TR13 FAQ
1.How can I place an order for SMAJ170E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170E3/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 SMAJ170E3/TR13 reliable?
The price and inventory of SMAJ170E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ170E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170E3/TR13?
SMAJ170E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170E3/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 SMAJ170E3/TR13?
For technical support, including SMAJ170E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170E3/TR13 requirements.
6.How does Aetrix verify that SMAJ170E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ170E3/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 SMAJ170E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ170E3/TR13?
All SMAJ170E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170E3/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 SMAJ170E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ170E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170E3/TR13 Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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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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