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Microchip Technology SMAJ170CAE3/TR13
- Part No.:
- SMAJ170CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CAE3/TR13.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,719
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Product details
Overview
SMAJ170CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for secondary lightning and ESD/EFT 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), 287 V clamping voltage (VC) at 10/1000 µs, and 500 W peak pulse power dissipation - deployed in telecom power supplies and industrial I/O interfaces.
For engineers reviewing the SMAJ170CAE3/TR13 datasheet, SMAJ170CAE3/TR13 pinout, SMAJ170CAE3/TR13 application, or SMAJ170CAE3/TR13 equivalent, key selection criteria include bidirectional clamping capability, IEC61000-4-5 Class 1 compliance with 42 Ω source impedance, RoHS-compliant matte-tin plating, DO-214AC package thermal performance (15 °C/W junction-to-lead), and tape-and-reel packaging (TR13 = 2500/reel).
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its <100 ps theoretical response time for unidirectional mode (and <5 ns for bidirectional) ensures effective suppression of fast transients including ESD per IEC61000-4-2 (±8 kV contact) and EFT per IEC61000-4-4 (±2 kV).
It meets IEC61000-4-5 secondary lightning surge immunity up to Class 1 (42 Ω source) and Class 2 (12 Ω source), with clamping performance validated at TL = 75 °C and derated linearly above 25 °C per the published thermal curve. The device sustains 1.56 W steady-state power at 25 °C ambient on FR4 with recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff) | 170 V - Maximum continuous reverse working voltage before conduction begins; sets upper limit for protected circuit operating voltage. |
| VBR (Min) | 189 V @ IBR = 1 mA - Guaranteed minimum avalanche onset voltage; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 287 V @ 304 A (10/1000 µs) - Clamped voltage during worst-case surge; defines maximum stress imposed on downstream components. |
| PPP | 500 W - Peak pulse power handling capacity; determines survivability against standardized lightning surges (IEC61000-4-5). |
| IPP | 304 A - Peak surge current supported at rated clamping voltage; correlates directly with system-level surge test level (e.g., 2 kV/12 Ω = ~167 A). |
| TJ Range | –65 °C to +150 °C - Full operational junction temperature range; supports deployment in automotive under-hood or industrial outdoor enclosures. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 15 °C/W junction-to-lead thermal resistance; enables high-power dissipation without heatsink. |
Pinout & Package
DO-214AC (SMA) package: void-free thermosetting epoxy body (UL94V-0), C-bend leads with RoHS-compliant annealed matte-tin plating, moisture sensitivity level 1 (no dry pack required), weight 0.064 g, tape-and-reel packaged per EIA-481-1-A (12 mm tape, 2500/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional terminals | No polarity marking; symmetrical conduction in both directions - used across differential lines or ungrounded rails where voltage reversal occurs. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or floating circuits (e.g., RS-485, CAN bus stubs) without external polarity management. |
| IEC61000-4-5 Class 1 compliance | Validated for secondary lightning surges up to 42 Ω source impedance - meets telecom central office and industrial control cabinet requirements. |
| RoHS-compliant "e3" suffix | Matte-tin plating meets JEDEC J-STD-020B Level 1 moisture sensitivity; eliminates post-manufacture baking and supports lead-free reflow. |
| 500 W peak pulse rating | Supports sustained surge events in 48 V telecom power distribution and PoE-powered equipment without degradation. |
| Fast response (<5 ns) | Clamps transients before sensitive ICs (e.g., microcontrollers, ADCs) experience latch-up or gate oxide damage. |
Applications
| Telecom Power Input Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: 48 V DC input stage of VoIP gateway exposed to induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between power rail and ground, upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤287 V during 304 A surges, preventing damage to upstream rectifiers and downstream regulators. | Use Scenario: Differential data line in factory automation PLC communicating over long cable runs subject to EFT bursts. IC Role / Device Role / Timing Role: Bidirectional TVS connected across A/B lines and referenced to local ground, suppressing common-mode transients. Use Value: Maintains signal integrity by clamping ±2 kV EFT pulses within 5 ns, avoiding communication lockup or receiver saturation. |
| Automotive Body Control Module I/O | Smart Meter AC Mains Interface |
Use Scenario: 12 V sensor supply line in BCM subjected to load dump and ISO 7637-2 pulse 5a/b. IC Role / Device Role / Timing Role: Secondary protection device after primary GDT or varistor, absorbing residual energy and limiting clamping voltage. Use Value: Provides precise 287 V clamping at elevated temperatures (150 °C junction), ensuring robustness beyond basic varistor performance. | Use Scenario: Low-voltage auxiliary supply derived from AC mains via resistive/capacitive dropper in utility meter. IC Role / Device Role / Timing Role: Bidirectional clamp across rectified DC output, protecting MCU and RTC from surges coupled through transformer or Y-capacitor. Use Value: Withstands repeated 10/1000 µs surges up to 500 W without parameter drift, supporting 10+ year field life in harsh grid environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170CA-E3/52 | Same VWM/VC, but SMB package (lower PPP = 600 W, higher thermal resistance 25 °C/W). | Less suitable for high-repetition surges or high-ambient environments due to reduced thermal mass and dissipation. | Select when board space is constrained and surge duty cycle is low (e.g., infrequent ESD-only zones). |
| SMCJ170CA-E3/73 | Same VWM/VC, but SMC package (PPP = 1500 W, 10 °C/W junction-to-lead). | Over-specified for 500 W use cases; requires larger PCB area and higher assembly cost. | Select only when system-level testing demands >1000 W surge headroom or extended thermal cycling reliability. |
Compared with SMBJ170CA-E3/52 and SMCJ170CA-E3/73, SMAJ170CAE3/TR13 delivers optimal balance of 500 W surge capability, DO-214AC footprint compatibility, and cost-effective RoHS-compliant manufacturing - making it the standard choice for mid-power industrial and telecom protection.
Availability
SMAJ170CAE3/TR13 is available at Aetrix Electronics and suitable for telecom power inputs, industrial RS-485 interfaces, automotive body control modules, smart meter auxiliary supplies, and PoE-powered edge devices requiring stable component supply across multi-year production cycles.
Supply support for SMAJ170CAE3/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 developed specifically for surface-mount transient suppression in space-constrained, high-surge environments - emphasizing robust DO-214AC thermal performance, fast bidirectional response, and compliance with IEC61000-4-x immunity standards.
FAQ
What does the "CA" suffix indicate in SMAJ170CAE3/TR13?
The "CA" suffix in SMAJ170CAE3/TR13 denotes a bidirectional configuration with RoHS-compliant matte-tin plating ("e3") and tape-and-reel packaging ("TR13"). Unlike unidirectional variants (e.g., SMAJ170A), SMAJ170CAE3/TR13 conducts symmetrically in both polarities - essential for protecting AC-coupled or floating signal paths such as RS-485 or CAN bus lines without polarity concerns.
How does SMAJ170CAE3/TR13 perform under IEC61000-4-5 testing?
SMAJ170CAE3/TR13 is rated for IEC61000-4-5 secondary lightning surge immunity up to Class 1 with 42 Ω source impedance and Class 2 with 12 Ω source impedance. At its specified 304 A peak pulse current (10/1000 µs), it clamps to 287 V - ensuring downstream components see no more than this voltage during standardized surge events, meeting requirements for telecom infrastructure and industrial control cabinets.
What is the thermal resistance of SMAJ170CAE3/TR13, and why does it matter?
SMAJ170CAE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and junction-to-ambient of 80 °C/W on FR4 with recommended footprint. This low RθJL enables efficient heat transfer to PCB copper, critical for sustaining repetitive 500 W surges without thermal runaway. It directly impacts reliability in high-duty-cycle applications like PoE switches or motor drive I/O protection.
Can SMAJ170CAE3/TR13 replace older SMAJ170C parts?
Yes - SMAJ170CAE3/TR13 is a direct functional and mechanical replacement for SMAJ170C, adding RoHS compliance ("e3"), improved plating consistency, and tape-and-reel packaging ("TR13"). Electrical parameters (VWM, VC, IPP) are identical; the "A" in "CA" indicates tightened parameter tolerances per Microsemi's enhanced screening, while "E3/TR13" confirms environmental and logistics compliance.
What is the maximum steady-state power dissipation for SMAJ170CAE3/TR13?
SMAJ170CAE3/TR13 dissipates 1.56 W continuously at 25 °C ambient (TA) and 5 W at 75 °C lead temperature (TL) when mounted on FR4 with the recommended footprint. This steady-state rating governs leakage-limited power handling in always-on protection circuits - distinct from its 500 W transient rating - and must be verified against actual board layout and airflow conditions.
SMAJ170CAE3/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):
- 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)
SMAJ170CAE3/TR13 FAQ
1.How can I place an order for SMAJ170CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CAE3/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 SMAJ170CAE3/TR13 reliable?
The price and inventory of SMAJ170CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ170CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CAE3/TR13?
SMAJ170CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CAE3/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 SMAJ170CAE3/TR13?
For technical support, including SMAJ170CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ170CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ170CAE3/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 SMAJ170CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ170CAE3/TR13?
All SMAJ170CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CAE3/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 SMAJ170CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ170CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170CAE3/TR13 Tags
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