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Microchip Technology SMAJ170AE3/TR13
- Part No.:
- SMAJ170AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170AE3/TR13.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,162
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Product details
Overview
SMAJ170AE3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in DC power rails and signal lines. It features a 170 V standoff voltage (VWM), 189 V minimum breakdown voltage (VBR), 304 A peak pulse current (IPP) at 10/1000 µs, 275 V clamping voltage (VC), and 500 W peak pulse power dissipation - deployed in telecom power supplies, industrial I/O interfaces, and automotive body control modules.
For engineers reviewing the SMAJ170AE3/TR13 datasheet, SMAJ170AE3/TR13 pinout, SMAJ170AE3/TR13 application, or SMAJ170AE3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 secondary lightning (42 Ω source), unidirectional polarity with cathode band marking, DO-214AC package thermal resistance (15 °C/W junction-to-lead), and RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
Technical Context
This TVS operates as a silicon avalanche diode with fast response (<100 ps theoretical turn-on from 0 V to VBR min.) and low dynamic impedance during transient events. Its unidirectional configuration provides forward conduction capability (40 A peak surge, 3.5 V max forward voltage) while blocking reverse leakage (<1.8 µA at 170 V).
The device is rated for -65 °C to +150 °C operating temperature, supports 0.01% impulse repetition rate, and delivers stable clamping up to 500 W at 25 °C with derating above 75 °C ambient. Thermal design relies on FR4 PCB mounting with recommended footprint (1.70–2.26 mm A-dimension) and 1 oz copper for 1.56 W steady-state dissipation at 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - maximum continuous reverse working voltage before significant leakage; sets upper limit for protected circuit DC bias. |
| VBR min @ IBR | 189 V @ 1 mA - guaranteed avalanche initiation threshold; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 275 V @ 304 A (10/1000 µs) - maximum clamped voltage seen by downstream components during worst-case surge. |
| PPP | 500 W - peak transient energy handling capacity; defines survivability against IEC61000-4-5 Class 1–4 surges with 42 Ω or 12 Ω source impedance. |
| IPP | 304 A - peak current supported at VC; determines minimum series impedance required upstream to limit fault current. |
| ID @ VWM | ≤1.8 µA - reverse standby leakage at full standoff; negligible loading on high-impedance sensor or reference circuits. |
| TJ range | -65 °C to +150 °C - extended temperature operation suitable for under-hood automotive and outdoor industrial environments. |
Pinout & Package
Package: DO-214AC (SMAJ), surface-mount, void-free thermosetting epoxy case (UL94V-0), C-bend leads with RoHS-compliant annealed matte-tin plating. Cathode indicated by band; no polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during reverse transient | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR. |
| Cathode | Reference / Ground return path | Typically tied to system ground; establishes polarity and defines clamping reference point. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Enables robust protection against IEC61000-4-5 secondary lightning surges (42 Ω source) without derating in compact SMT form factor. |
| Unidirectional avalanche structure | Supports forward surge current up to 40 A (8.3 ms half-sine), allowing use in DC power rail protection with polarity-aware placement. |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating, qualified per MIL-STD-750 Method 2026 for solderability. |
| DO-214AC mechanical compatibility | Standardized footprint enables drop-in replacement for legacy SMAJ-series parts and interoperability with automated pick-and-place equipment. |
| Low thermal resistance | 15 °C/W junction-to-lead enables efficient heat transfer to PCB copper, supporting sustained 1.56 W dissipation at 25 °C ambient. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC input stages in PLC I/O modules exposed to inductive switching transients from solenoid valves and contactors. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp voltage spikes exceeding 170 V. Use Value: Limits transient overvoltage to ≤275 V, preventing damage to microcontrollers and isolated gate drivers rated for 300 V absolute maximum. |
Use Scenario: Surge suppression on LIN bus power supply lines in door module ECUs subjected to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across VBAT and GND to absorb 500 W pulses without degradation over 10,000 cycles. Use Value: Maintains <1.8 µA leakage at 170 V, avoiding battery drain in always-on vehicle subsystems while surviving -40 °C to +125 °C operation. |
| Telecom Power Rectifiers | Renewable Energy Inverters |
|
Use Scenario: Secondary-side DC output protection in AC/DC front-end supplies for base station radios, facing EFT bursts per IEC61000-4-4. IC Role / Device Role / Timing Role: Fast-response (≤100 ps) unidirectional suppressor shunting transients before they reach DC-DC converters. Use Value: Clamps 304 A surges within 275 V, preserving 12 V/48 V output regulation integrity and eliminating need for additional RC snubbers. |
Use Scenario: DC-link overvoltage protection in solar string inverters where PV array transients couple into MPPT controller inputs. IC Role / Device Role / Timing Role: High-energy TVS mounted directly at DC bus terminals to divert lightning-induced surges per IEC61000-4-5 Class 2 (12 Ω source). Use Value: Withstands 150 °C junction temperature and delivers 500 W pulse rating without thermal runaway, ensuring long-term reliability in desert installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170AHE3/TR13 | Same electrical specs but includes high-reliability screening (HTRB, surge, temperature cycling) per MIL-PRF-19500 JANTX requirements. | Required for aerospace avionics where 100% lot testing and extended life validation are mandated. | Select SMAJ170AHE3/TR13 only if qualification to MIL-PRF-19500 is contractually required; otherwise SMAJ170AE3/TR13 meets commercial/industrial needs. |
| SMBJ170A-E3/52 | Same VWM, VBR, VC, but lower 600 W PPP rating and SMB (DO-214AA) package with higher thermal resistance (20 °C/W). | Used where board space allows larger footprint and higher clamping margin is acceptable for cost-sensitive designs. | Choose SMBJ170A-E3/52 only if layout accommodates wider pad spacing and thermal management permits higher junction rise; SMAJ170AE3/TR13 offers superior power density. |
Compared with SMAJ170AHE3/TR13, the SMAJ170AE3/TR13 omits military-grade screening but retains identical surge ratings and RoHS compliance; versus SMBJ170A-E3/52, it delivers 500 W in a smaller DO-214AC footprint with 25% lower thermal resistance - critical for high-density power electronics.
Availability
SMAJ170AE3/TR13 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power rectifiers requiring stable component supply across multi-year production cycles.
Supply support for SMAJ170AE3/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.
The SMAJ series was engineered for surface-mount transient suppression in harsh environments - targeting industrial automation, aerospace, and automotive systems where failure tolerance and surge immunity are mission-critical.
FAQ
What is the clamping voltage of SMAJ170AE3/TR13 at its rated peak pulse current?
The SMAJ170AE3/TR13 has a maximum clamping voltage (VC) of 275 V when subjected to its rated 304 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 a worst-case transient event. The SMAJ170AE3/TR13 maintains this clamping performance across its full operating temperature range.
Is SMAJ170AE3/TR13 unidirectional or bidirectional?
SMAJ170AE3/TR13 is a unidirectional transient voltage suppressor, indicated by the absence of "C" or "CA" in its part number suffix. It features a cathode band marking and conducts in the forward direction up to 40 A (8.3 ms half-sine), while clamping reverse transients above 170 V standoff. Bidirectional variants such as SMAJ170CAE3/TR13 are separate orderable parts with symmetrical breakdown behavior.
What package type does SMAJ170AE3/TR13 use, and what are its key mechanical dimensions?
SMAJ170AE3/TR13 uses the DO-214AC (SMA) surface-mount package with C-bend leads and UL94V-0 epoxy body. Key dimensions include length A = 1.70–2.26 mm, width B = 3.99–4.50 mm, and height C = 2.57–2.79 mm. The recommended PCB pad layout follows Microsemi's documented footprint to ensure thermal performance and solder joint reliability.
Does SMAJ170AE3/TR13 meet IEC61000-4-5 for lightning surge immunity?
Yes, SMAJ170AE3/TR13 is rated for secondary lightning protection per IEC61000-4-5 with both 42 Ω and 12 Ω source impedances. At 42 Ω, it supports Class 1 (up to 100 V VWM) and Class 2 (up to 51 V VWM); at 12 Ω, it covers Class 1 (up to 30 V VWM) and Class 2 (up to 16 V VWM). While SMAJ170AE3/TR13 exceeds these class thresholds in voltage rating, its 500 W pulse capability validates its use in higher-class implementations when combined with appropriate system-level impedance.
What is the maximum steady-state power dissipation for SMAJ170AE3/TR13 on a standard FR4 PCB?
When mounted on an FR4 printed circuit board with 1 oz copper and Microsemi's recommended footprint, SMAJ170AE3/TR13 dissipates up to 1.56 W continuously at 25 °C ambient temperature (TA) or 5 W at 75 °C lead temperature (TL). This steady-state rating assumes proper thermal relief and copper pour area; exceeding it risks thermal runaway during prolonged overvoltage conditions.
SMAJ170AE3/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:
- 275V
- Current - Peak Pulse (10/1000µs):
- 1.8A
- 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)
SMAJ170AE3/TR13 FAQ
1.How can I place an order for SMAJ170AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170AE3/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 SMAJ170AE3/TR13 reliable?
The price and inventory of SMAJ170AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ170AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170AE3/TR13?
SMAJ170AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170AE3/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 SMAJ170AE3/TR13?
For technical support, including SMAJ170AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ170AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ170AE3/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 SMAJ170AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ170AE3/TR13?
All SMAJ170AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170AE3/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 SMAJ170AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ170AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170AE3/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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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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