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Microchip Technology SMAJ51CAE3/TR13
- Part No.:
- SMAJ51CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51CAE3/TR13.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,360
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Product details
Overview
SMAJ51CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 51 V reverse standoff voltage (VWM), 56.7 V minimum breakdown voltage (VBR), 91.1 V maximum clamping voltage (VC) at 5.5 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the SMAJ51CAE3/TR13 datasheet, SMAJ51CAE3/TR13 pinout, SMAJ51CAE3/TR13 application, or SMAJ51CAE3/TR13 equivalent, key selection criteria include bidirectional clamping capability, IEC61000-4-2/4-4/4-5 compliance class 2 (42 Ω source), RoHS-compliant matte-tin plating, DO-214AC package thermal resistance (15 °C/W junction-to-lead), and tape-and-reel delivery (TR13 = 2500/reel).
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with <100 ps theoretical response time for unidirectional mode and <5 ns for bidirectional conduction - enabling sub-nanosecond suppression of fast transients like ESD and EFT. Its clamping behavior is defined by avalanche breakdown in both directions, with no polarity marking on the device body.
The SMAJ51CAE3/TR13 is rated for continuous operation from –65 °C to +150 °C, dissipates 5 W steady-state power at lead temperature (TL) of 75 °C, and exhibits 5.5 μA maximum standby leakage current at VWM. Thermal resistance of 15 °C/W (junction-to-lead) supports reliable surge energy handling when mounted on FR4 with recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR min @ IBR | 56.7 V @ 1 mA - Minimum voltage at which avalanche breakdown initiates; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 91.1 V @ 5.5 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream ICs. |
| PPP | 500 W - Peak pulse power handling capacity; determines survivability against standardized lightning surges (IEC61000-4-5). |
| ID max @ VWM | 5.5 μA - Standby leakage current at rated standoff; low enough to avoid loading sensitive analog or battery-backed circuits. |
| TJ range | –65 °C to +150 °C - Full operational junction temperature range; supports deployment in under-hood automotive or industrial enclosures. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with wide leads for low thermal resistance (15 °C/W) and high surge current path integrity. |
Pinout & Package
DO-214AC (SMA) package: void-free thermosetting epoxy body (UL94V-0), C-bend (modified J-bend) leads with RoHS-compliant annealed matte-tin plating, solderable per MIL-STD-750 Method 2026. Bidirectional construction means no cathode band marking; terminals are non-polarized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Surge current input/output node | Both terminals function identically; bidirectional clamping allows connection across any two points needing voltage limiting without polarity concern. |
| Case / Body | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and heat conduction path to PCB copper; requires recommended pad layout (0.245" × 0.075") for optimal thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN bus) without polarity constraints. |
| IEC61000-4-5 Class 2 compliance (42 Ω source) | Validated for secondary lightning surge immunity up to 1 kV open-circuit voltage with 42 Ω source impedance - meets industrial port requirements. |
| RoHS-compliant "e3" suffix | Matte-tin plating eliminates lead content while maintaining solderability and corrosion resistance per JEDEC J-STD-020B Level 1 moisture sensitivity. |
| 500 W peak pulse power @ 10/1000 µs | Supports repeated surge events in power supply inputs and Ethernet PHY interfaces without degradation under specified duty cycle (0.01%). |
| Low thermal resistance (15 °C/W) | Enables efficient heat transfer from junction to PCB trace, reducing risk of thermal runaway during multi-pulse stress testing. |
Applications
| Industrial Power Input Protection | Telecom Data Line Protection |
|---|---|
Use Scenario: 48 V DC power feed to remote base station equipment exposed to induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of DC-DC converter input to limit transient overvoltage before it reaches switching controller ICs. Use Value: Clamps 1 kV/42 Ω IEC61000-4-5 surges to ≤91.1 V, preventing latch-up or gate oxide damage in downstream MOSFETs and controllers. |
Use Scenario: RS-485 differential pair in factory automation PLC modules subjected to ESD events during field wiring. IC Role / Device Role / Timing Role: Bidirectional TVS connected across A/B lines to shunt ESD energy before it reaches transceiver IC's input stage. Use Value: Sub-5 ns response ensures clamping occurs before ESD pulse propagates into transceiver, preserving signal integrity and avoiding data corruption. |
| Automotive Body Control Module | Medical Sensor Interface |
Use Scenario: LIN bus line in vehicle door module exposed to load dump and ISO 7637-2 pulses during battery disconnection. IC Role / Device Role / Timing Role: Transient suppressor bridging LIN line to chassis ground to absorb inductive kickback energy. Use Value: Withstands 500 W surges and operates from –65 °C to +150 °C, meeting extended automotive temperature and reliability requirements. |
Use Scenario: Analog front-end of patient-worn ECG sensor interfacing with hospital-grade isolation barrier. IC Role / Device Role / Timing Role: Low-leakage (5.5 μA) TVS protecting instrumentation amplifier inputs from electrostatic discharge during handling. Use Value: Minimal standby current avoids offset drift or gain error in high-impedance biopotential measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ51CA | Same VWM/VBR/VC, but SMC (DO-214AB) package - larger footprint, higher thermal mass (1000 W rating), 25 °C/W junction-to-ambient. | Preferred where higher surge energy (1000 W) or board-level thermal budget allows larger package; not drop-in compatible due to different pad layout. | Select SMCJ51CA only if system-level surge test exceeds 500 W or ambient cooling is limited. |
| SMBJ51CA | Same electrical specs, but SMB (DO-214AA) package - smaller footprint, lower surge rating (600 W), 20 °C/W junction-to-ambient. | Suitable for space-constrained designs with moderate surge exposure; less robust thermal dissipation than SMAJ51CAE3/TR13. | Choose SMBJ51CA only when PCB real estate is critical and peak surge energy remains ≤600 W. |
Compared with SMCJ51CA and SMBJ51CA, the SMAJ51CAE3/TR13 delivers optimal balance of 500 W surge capability, DO-214AC thermal performance (15 °C/W), and compact size - making it ideal for mid-power industrial and telecom interfaces where reliability and layout efficiency are both prioritized.
Availability
SMAJ51CAE3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, telecom data line hardening, automotive body control modules, and medical sensor interface circuits requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMAJ51CAE3/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 engineered for surface-mount transient suppression in harsh environments - emphasizing fast response, repeatable clamping, and thermal resilience in compact DO-214AC packaging.
FAQ
What does the "CA" suffix indicate in SMAJ51CAE3/TR13?
The "CA" suffix denotes a bidirectional configuration - meaning the SMAJ51CAE3/TR13 provides symmetrical clamping in both forward and reverse directions, with no cathode marking on the package. This enables direct placement across AC-coupled or floating signal lines like RS-485 or CAN without polarity concerns, unlike unidirectional variants (e.g., SMAJ51A) that require correct orientation relative to ground.
Is SMAJ51CAE3/TR13 compliant with IEC61000-4-5 for lightning surge protection?
Yes, SMAJ51CAE3/TR13 is validated for IEC61000-4-5 secondary lightning surge immunity with 42 Ω source impedance up to Class 2 (1 kV open-circuit). Its 500 W peak pulse power rating and 91.1 V clamping voltage ensure protected circuits remain within safe operating limits during standardized surge events - confirmed in Microsemi's application documentation for the SMAJ5.0–170CA family.
What is the thermal resistance specification for SMAJ51CAE3/TR13?
SMAJ51CAE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 15 °C/W when mounted on an FR4 PCB with 1 oz copper and Microsemi's recommended pad layout. This value is critical for calculating junction temperature rise during repeated surge events and confirms suitability for high-reliability applications where thermal management directly impacts long-term clamping consistency.
Does SMAJ51CAE3/TR13 require dry pack or special moisture handling?
No - SMAJ51CAE3/TR13 is rated IPC/JEDEC J-STD-020B Level 1 for moisture sensitivity, meaning it has unlimited floor life and requires no dry pack or baking prior to reflow. The device's void-free epoxy body and matte-tin plating contribute to this robust moisture resistance, simplifying manufacturing logistics for high-volume SMT assembly.
What does the "TR13" suffix signify in SMAJ51CAE3/TR13?
The "TR13" suffix indicates tape-and-reel packaging: 2500 units per 13-inch reel, compliant with EIA-481-1-A standards and using 12 mm carrier tape. This format supports automated pick-and-place assembly and is optimized for production-line efficiency - distinct from the "TR" variant (750/reel on 7-inch reel) and bulk or ammo-pack alternatives.
SMAJ51CAE3/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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 6.1A
- 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)
SMAJ51CAE3/TR13 FAQ
1.How can I place an order for SMAJ51CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51CAE3/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 SMAJ51CAE3/TR13 reliable?
The price and inventory of SMAJ51CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ51CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51CAE3/TR13?
SMAJ51CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51CAE3/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 SMAJ51CAE3/TR13?
For technical support, including SMAJ51CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ51CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ51CAE3/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 SMAJ51CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ51CAE3/TR13?
All SMAJ51CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51CAE3/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 SMAJ51CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ51CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51CAE3/TR13 Tags
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