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Microchip Technology SMAJ51CE3/TR13
- Part No.:
- SMAJ51CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51CE3/TR13.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,499
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Product details
Overview
SMAJ51CE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for robust ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 51 V 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 telecom power supplies and industrial I/O interfaces.
For engineers reviewing the SMAJ51CE3/TR13 datasheet, SMAJ51CE3/TR13 pinout, SMAJ51CE3/TR13 application, or SMAJ51CE3/TR13 equivalent, key selection criteria include bidirectional clamping behavior, IEC61000-4-2/4-4/4-5 compliance, DO-214AC package thermal performance, and RoHS-compliant matte-tin terminations with tape-and-reel delivery (TR13).
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 (unidirectional) and <5 ns for bidirectional devices ensures effective suppression of fast transients including ESD events and switching noise.
The device is rated for 500 W peak pulse power at 25 °C with 0.01% impulse repetition rate, and exhibits 15 °C/W junction-to-lead thermal resistance when mounted on FR4 with recommended footprint. Standby leakage remains ≤5.5 μA at 51 V VWM, supporting low-power system integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 48 V DC systems. |
| VBR min @ IBR | 56.7 V @ 1 mA - Minimum voltage at which avalanche conduction initiates; ensures predictable turn-on threshold. |
| VC @ IPP | 91.1 V @ 5.5 A - Clamped voltage during 10/1000 µs surge; limits downstream component stress to safe levels. |
| PPP | 500 W - Peak pulse power handling capability; supports high-energy surges common in industrial environments. |
| ID @ VWM | ≤5.5 μA - Low leakage current at standoff voltage; preserves battery life and signal integrity in always-on circuits. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with wide leads for enhanced thermal dissipation and mechanical reliability. |
| RoHS | e3 suffix - Lead-free matte-tin plating compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020B Level 1 moisture sensitivity. |
Pinout & Package
DO-214AC (SMA) package: surface-mount, bidirectional configuration with no polarity marking; void-free thermosetting epoxy body meeting UL94V-0; C-bend (modified J-bend) leads with annealed matte-tin plating solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No functional distinction - either terminal serves as input or return path; enables AC or floating rail protection without orientation dependency. |
| Case / Body | Non-electrical mechanical interface | Thermally conductive epoxy body transfers heat to PCB copper; wide lead geometry enhances thermal resistance control (15 °C/W junction-to-lead). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, or ungrounded lines without polarity concerns - critical for RS-485, CAN, and Ethernet PHY interfaces. |
| IEC61000-4-5 Class 2 compliance | Validated for secondary lightning surges with 42 Ω source impedance up to 51 V VWM; meets industrial immunity requirements without external series impedance. |
| Fast response time | <5 ns turn-on for bidirectional operation - suppresses sub-microsecond transients before sensitive ICs experience overvoltage damage. |
| 500 W peak pulse rating | Handles high-energy transients from inductive load switching or induced RF in motor drives and PLC I/O modules. |
| Tape-and-reel packaging | TR13 suffix indicates 2500 units per 13-inch reel per EIA-481-1-A - optimized for automated SMT placement and production traceability. |
Applications
| Industrial PLC Analog Inputs | Telecom DC Power Feeds |
|---|---|
|
Use Scenario: Protection of 4–20 mA current-loop inputs against field-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input terminals to limit excursion beyond ±91.1 V during 5.5 A transients. Use Value: Prevents op-amp and ADC damage while maintaining <5.5 μA leakage at 24 V nominal supply - preserving measurement accuracy and long-term calibration stability. |
Use Scenario: Secondary surge protection on -48 V telecom power distribution boards upstream of DC/DC converters. IC Role / Device Role / Timing Role: Fast-acting shunt element that clamps line-to-ground transients within 5 ns, diverting up to 500 W away from downstream regulators. Use Value: Ensures uninterrupted operation during IEC61000-4-5 Class 2 surges (1 kV, 42 Ω source), reducing field failure rates in central office equipment. |
| Automotive Body Control Modules | RS-485 Data Lines |
|
Use Scenario: Protection of LIN bus and sensor supply lines exposed to load-dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Bidirectional TVS connected between VBAT and GND to clamp positive and negative spikes simultaneously. Use Value: Withstands 500 W pulses and operates from -65 °C to +150 °C - suitable for under-hood deployment without derating. |
Use Scenario: Transient suppression on balanced RS-485 differential pairs in factory automation networks subject to ESD and cable coupling. IC Role / Device Role / Timing Role: Common-mode clamp placed across A/B lines to suppress asymmetrical surges while preserving signal integrity. Use Value: Symmetrical 91.1 V clamping ensures equal voltage limiting on both lines - prevents receiver saturation and maintains >100 Mbps data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A | Unidirectional version with cathode band marking; same VWM, VBR, VC, and PPP ratings but asymmetric conduction. | Requires known polarity in circuit; unsuitable for AC or floating nodes where reverse conduction must be supported. | Select SMAJ51A only when protecting single-polarity DC rails with defined ground reference and no risk of reverse voltage exposure. |
| SMBJ51CA | Same bidirectional function but in DO-214AA (SMB) package; 600 W peak pulse rating; slightly higher VC (93.6 V) at 6.1 A. | Higher power handling but larger footprint; requires PCB layout change due to different pad dimensions and thermal mass. | Choose SMBJ51CA when system-level surge testing exceeds 500 W or when board space allows larger SMB package for improved thermal margin. |
Compared with SMAJ51CE3/TR13, SMAJ51A lacks bidirectional symmetry and requires polarity-aware placement, while SMBJ51CA offers higher pulse power but demands layout revision - making SMAJ51CE3/TR13 optimal for cost-sensitive, space-constrained, and polarity-agnostic designs requiring verified 500 W IEC61000-4-5 Class 2 compliance.
Availability
SMAJ51CE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, telecom DC power feeds, and automotive body control modules requiring stable component supply with full RoHS compliance and tape-and-reel logistics support.
Supply support for SMAJ51CE3/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 harsh environments - emphasizing fast response, repeatable clamping, and robust thermal performance in compact DO-214AC packages.
FAQ
What does the 'C' and 'E3' in SMAJ51CE3/TR13 signify?
The 'C' denotes bidirectional construction - meaning the SMAJ51CE3/TR13 clamps voltage symmetrically in both polarities, unlike unidirectional variants marked 'A'. The 'E3' suffix confirms RoHS compliance with annealed matte-tin plating per JEDEC standards, ensuring lead-free assembly compatibility and environmental adherence without compromising solderability or thermal performance.
Is SMAJ51CE3/TR13 suitable for IEC61000-4-5 Class 2 lightning surge protection?
Yes, SMAJ51CE3/TR13 is explicitly rated for IEC61000-4-5 Class 2 secondary lightning protection with 42 Ω source impedance, covering all SMAJ5.0 to SMAJ51A/CA devices per the manufacturer's specification table. Its 91.1 V clamping voltage at 5.5 A ensures downstream circuitry remains within safe operating limits during standardized 1 kV surge tests.
What is the thermal resistance of SMAJ51CE3/TR13 and how does it affect PCB layout?
SMAJ51CE3/TR13 has a junction-to-lead thermal resistance of 15 °C/W and junction-to-ambient of 80 °C/W when mounted on FR4 with 1 oz copper and the recommended footprint. This means adequate copper pour around the pads and proper via placement beneath the leads are essential to maintain reliability under repeated 500 W surges - underscoring the need to follow Microsemi's published pad layout on page 5 of the datasheet.
How does the clamping voltage of SMAJ51CE3/TR13 compare to its breakdown voltage?
SMAJ51CE3/TR13 has a minimum breakdown voltage (VBR) of 56.7 V at 1 mA and a maximum clamping voltage (VC) of 91.1 V at 5.5 A peak pulse current. This ~60% overvoltage margin reflects the device's dynamic impedance during surge conduction and ensures protected ICs see no more than 91.1 V even under worst-case 500 W transients - a critical design parameter for selecting downstream voltage tolerances.
Can SMAJ51CE3/TR13 replace SMAJ51A in an existing design?
No - SMAJ51CE3/TR13 cannot directly replace SMAJ51A without circuit review. While both share identical electrical ratings, SMAJ51A is unidirectional and requires correct cathode orientation, whereas SMAJ51CE3/TR13 is bidirectional with no polarity marking. Substitution may cause improper clamping or failure to protect reverse-polarity transients unless the application inherently supports symmetrical conduction.
SMAJ51CE3/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:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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)
SMAJ51CE3/TR13 FAQ
1.How can I place an order for SMAJ51CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51CE3/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 SMAJ51CE3/TR13 reliable?
The price and inventory of SMAJ51CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ51CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51CE3/TR13?
SMAJ51CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51CE3/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 SMAJ51CE3/TR13?
For technical support, including SMAJ51CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ51CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ51CE3/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 SMAJ51CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ51CE3/TR13?
All SMAJ51CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51CE3/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 SMAJ51CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ51CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51CE3/TR13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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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
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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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