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Microchip Technology SMAJ51AE3/TR13
- Part No.:
- SMAJ51AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51AE3/TR13.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,100
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Product details
Overview
SMAJ51AE3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) designed for primary overvoltage protection of 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 at 5.5 A peak pulse current, 500 W peak pulse power rating at 10/1000 µs, and operates across –65 °C to +150 °C.
For engineers reviewing the SMAJ51AE3/TR13 datasheet, SMAJ51AE3/TR13 pinout, SMAJ51AE3/TR13 application, or SMAJ51AE3/TR13 equivalent, this device is selected for robust ESD/EFT protection per IEC61000-4-2/4-4, secondary lightning surge suppression per IEC61000-4-5 (Class 2, 42 Ω source), and high-reliability industrial power rail hardening where fast response (<100 ps theoretical) and low standby leakage (<1 µA @ VWM) are critical.
Technical Context
This TVS diode operates in avalanche breakdown mode to clamp transient overvoltages before they damage downstream ICs. Its unidirectional polarity-indicated by a cathode band-enables asymmetric protection on positive-rail applications without reverse conduction during normal operation.
It delivers 500 W peak pulse power handling with a 10/1000 µs waveform, exhibits <100 ps theoretical response time for unidirectional devices, and maintains thermal resistance of 15 °C/W junction-to-lead when mounted per recommended FR4 footprint, enabling reliable surge dissipation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage; defines safe DC working limit before leakage rises significantly. |
| VBR min | 56.7 V @ 1 mA - Minimum voltage at which avalanche conduction begins; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 91.1 V @ 5.5 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPP | 500 W - Peak pulse power capability; enables survival of high-energy transients like lightning-induced surges. |
| ID @ VWM | <1 µA - Ultra-low standby leakage; minimizes power loss and avoids false triggering in battery-powered or high-impedance circuits. |
| tRESPONSE | <100 ps theoretical - Near-instantaneous avalanche response; prevents sub-nanosecond ESD events from propagating. |
| TOP/TSTG | –65 °C to +150 °C - Wide temperature range supports automotive under-hood, industrial control, and outdoor equipment use. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy body meeting UL94V-0; moisture sensitivity level (MSL) 1 - no dry pack required per J-STD-020B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., +12 V rail); marked by a visible band on the package body. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant "e3" termination | Matte-tin plating per MIL-STD-750 Method 2026; compatible with lead-free reflow profiles up to 260 °C for 10 s. |
| High surge current capability | 5.5 A peak pulse current (IPP) at 10/1000 µs - sufficient for IEC61000-4-5 Class 2 (42 Ω source) secondary lightning events. |
| Low thermal resistance | 15 °C/W junction-to-lead - enables efficient heat transfer to PCB copper, supporting repeated surge duty cycles. |
| Stable parametric performance | Guaranteed VBR tolerance ±5% and VC consistency across production lots - simplifies design margining and validation. |
| Economical surface-mount form factor | DO-214AC footprint (5.28 × 2.79 mm max) - balances surge robustness with PCB space efficiency vs. larger SMC or axial packages. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +24 V rail and chassis ground to clamp surges before they reach upstream DC/DC converters and microcontrollers. Use Value: Withstands 500 W pulses and clamps to ≤91.1 V, preventing damage to 36 V-rated input capacitors and 5 V LDO regulators downstream. |
Use Scenario: CAN_H and CAN_L lines in vehicle BCM subjected to ESD events and battery voltage transients during jump-start conditions. IC Role / Device Role / Timing Role: Two SMAJ51AE3/TR13 diodes (one per line) used in unidirectional configuration to suppress positive-going transients while preserving signal integrity. Use Value: Sub-100 ps response ensures ESD pulses per IEC61000-4-2 (±8 kV contact) are clamped before CAN transceivers experience latch-up or permanent failure. |
| Telecom Remote Radio Unit (RRU) DC Feeder Protection | Medical Diagnostic Imaging Equipment Power Rail Protection |
Use Scenario: 48 V DC power feed to outdoor 5G remote radio units, vulnerable to induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Primary TVS on 48 V input, coordinated with upstream GDT and downstream MOV for staged surge protection per IEC61000-4-5 Class 2. Use Value: 91.1 V clamping limits stress on 60 V-rated DC/DC controllers and ensures compliance with EN 61000-4-5 test requirements using 42 Ω source impedance. |
Use Scenario: Auxiliary 12 V and 24 V rails in MRI or CT scanner subsystems requiring zero-failure reliability and low leakage. IC Role / Device Role / Timing Role: Unidirectional TVS on isolated power rails feeding analog front-end ASICs and precision ADCs. Use Value: <1 µA standby current avoids measurement drift in µV-level sensor interfaces; 150 °C max operating temperature supports sealed, convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51AHE3/TR13 | Same electrical specs but with enhanced screening per MIL-PRF-19500 JANTX; includes 100% temperature cycling and HTRB testing. | Required for aerospace, defense, and high-reliability avionics where extended qualification and lot traceability are mandated. | Select SMAJ51AHE3/TR13 only when JANTX-level screening documentation and test reports are contractually required. |
| SMBJ51A-E3/52 | Same VWM, VBR, VC, but lower 600 W PPP rating and SMB (DO-214AA) package (smaller footprint, higher thermal resistance). | Better suited for space-constrained consumer electronics where 600 W margin suffices and thermal mass is less critical. | Choose SMBJ51A-E3/52 only if board area is constrained and peak surge energy remains within 600 W; not drop-in due to different pad layout. |
Compared with SMAJ51AE3/TR13, SMAJ51AHE3/TR13 adds military-grade screening without altering electrical behavior, while SMBJ51A-E3/52 trades package size and thermal performance for higher peak power-neither is pin-compatible, requiring layout revision for substitution.
Availability
SMAJ51AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom remote radio units, and medical imaging equipment requiring stable component supply and RoHS-compliant surge protection.
Supply support for SMAJ51AE3/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, industrial, and communications markets.
The SMAJ series was developed specifically for surface-mount transient suppression in harsh environments, emphasizing robust surge handling, wide temperature operation, and consistent parametric stability across production lots.
FAQ
What is the clamping voltage of SMAJ51AE3/TR13 at its rated peak pulse current?
The SMAJ51AE3/TR13 has a maximum clamping voltage (VC) of 91.1 V at 5.5 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is guaranteed per the manufacturer's datasheet and defines the upper voltage limit imposed on protected circuitry during surge events. Designers must ensure downstream components tolerate this clamped voltage with appropriate safety margin.
Is SMAJ51AE3/TR13 unidirectional or bidirectional, and how is polarity identified?
SMAJ51AE3/TR13 is a unidirectional TVS diode, meaning it conducts only in reverse-bias (avalanche) mode to protect against positive transients on the cathode side. Polarity is indicated by a visible cathode band on the DO-214AC package body; the banded end connects to the line being protected, while the anode connects to ground. Bidirectional variants use a "C" or "CA" suffix (e.g., SMAJ51CA).
What standards does SMAJ51AE3/TR13 comply with for ESD and surge immunity?
SMAJ51AE3/TR13 is verified to meet IEC61000-4-2 for electrostatic discharge (ESD) immunity (±8 kV contact, ±15 kV air) and IEC61000-4-4 for electrical fast transients (EFT) (4 kV). It also provides secondary lightning protection per IEC61000-4-5 at Class 2 (42 Ω source impedance) and Class 4 (12 Ω source impedance), with clamping performance validated under those specific test conditions.
Can SMAJ51AE3/TR13 be used in place of SMAJ51A without changes to the PCB layout?
Yes - SMAJ51AE3/TR13 uses the identical DO-214AC (SMA) package and pinout as SMAJ51A. The "e3" suffix denotes RoHS-compliant matte-tin termination, and the "TR13" indicates tape-and-reel packaging (13-inch reel, 2500 units). No PCB layout changes are required; only solder profile adjustments may be needed to accommodate lead-free reflow.
What is the maximum steady-state power dissipation of SMAJ51AE3/TR13 at room temperature?
When mounted on a standard FR4 PCB with 1 oz copper and the recommended footprint, SMAJ51AE3/TR13 dissipates up to 1.56 W continuously at ambient temperature (TA) of 25 °C. At lead temperature (TL) of 75 °C, its steady-state rating increases to 5 W - a key consideration for designs with localized heating or forced-air cooling near the device.
SMAJ51AE3/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):
- 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)
SMAJ51AE3/TR13 FAQ
1.How can I place an order for SMAJ51AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51AE3/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 SMAJ51AE3/TR13 reliable?
The price and inventory of SMAJ51AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ51AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51AE3/TR13?
SMAJ51AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51AE3/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 SMAJ51AE3/TR13?
For technical support, including SMAJ51AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ51AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ51AE3/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 SMAJ51AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ51AE3/TR13?
All SMAJ51AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51AE3/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 SMAJ51AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ51AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51AE3/TR13 Tags
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