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Microchip Technology SMAJ4741E3/TR13
- Part No.:
- SMAJ4741E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4741E3/TR13.pdf
- Description:
- DIODE ZENER 11V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,948
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Product details
Overview
SMAJ4741E3/TR13 from SM Semiconductor is a 11.0 V, ±5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 23.0 mA test current (IZT), and 414 mA maximum regulator current (IZM) at 100°C junction temperature. It serves as a precision voltage reference and transient overvoltage clamp in low-profile DC power rails.
For engineers reviewing the SMAJ4741E3/TR13 datasheet, SMAJ4741E3/TR13 pinout, SMAJ4741E3/TR13 application, or SMAJ4741E3/TR13 equivalent, key selection criteria include zener voltage tolerance, surge current capability (414 mA IZM), thermal resistance (25 °C/W), and ROHS-compliant matte-tin plating for reliable solderability in high-density PCB layouts.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee characteristics, verified by dual-point dynamic impedance measurement (ZZT = 8.0 Ω @ IZT = 23.0 mA, ZZK = 400 Ω @ IZK = 0.25 mA). Its regulation stability spans -65°C to +150°C operating range with low reverse leakage (IR ≤ 5 µA @ VR = 8.4 V).
The SMAJ4741E3/TR13 delivers stable clamping during transient events via controlled avalanche breakdown, supported by void-free thermosetting epoxy encapsulation (UL94V-0 rated) and flexible axial-lead mounting terminals compatible with standard reflow and wave soldering processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 11.0 V ±5% @ IZT = 23.0 mA - defines precise clamping threshold for 12 V rail protection |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without external heatsink in ambient ≤ 75°C |
| Dynamic Impedance | 8.0 Ω @ IZT - ensures minimal voltage deviation under load current variation |
| Reverse Leakage | ≤5 µA @ VR = 8.4 V - guarantees low standby power loss in always-on circuits |
| Thermal Resistance | 25 °C/W (junction-to-lead) - enables direct lead heat conduction for improved thermal reliability |
| Surge Current | 414 mA @ TL = 100°C - sustains repeated ESD/inductive kick transients per IEC 61000-4-2 Level 4 |
| Operating Temp | -65°C to +150°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mountable with cathode band marking; body marked with part number; weight ≈ 0.3 g; ROHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node (e.g., ground or return path) during clamping operation |
| Cathode | Current exit terminal in forward bias; zener breakdown terminal in reverse bias | Connected to protected line (e.g., 12 V supply); band-marked end provides polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| 5% zener voltage tolerance | Enables tighter regulation margin vs. 10% variants, reducing design safety margin overhead |
| 25 °C/W junction-to-lead thermal resistance | Allows direct PCB copper pour connection to leads for passive cooling without thermal vias |
| UL94V-0 epoxy encapsulation | Meets flammability requirements for consumer and industrial end-equipment safety certifications |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation during lead-free reflow (J-STD-020 MSL1) |
| 0.25 mA knee current (IZK) | Guarantees stable regulation onset at ultra-low standby currents typical in battery-backed systems |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Clamping |
|---|---|
Use Scenario: Protecting analog sensor signal lines (e.g., pressure, temperature) from load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Zener clamping diode placed between signal line and ground to shunt >11 V spikes before reaching ADC input. Use Value: Prevents ADC saturation and latch-up by limiting voltage excursion to ≤11.55 V (11.0 V × 1.05), preserving measurement integrity. | Use Scenario: Safeguarding digital input channels of programmable logic controllers against inductive switching surges from solenoid valves. IC Role / Device Role / Timing Role: Reverse-biased transient voltage suppressor across input terminal and common rail. Use Value: Absorbs 414 mA surge current without degradation, maintaining channel availability after repetitive 100 ns–1 µs transients. |
| Consumer Power Adapter Regulation | Telecom DC-DC Feedback Reference |
Use Scenario: Providing stable 11 V reference for secondary-side feedback in isolated AC-DC adapters. IC Role / Device Role / Timing Role: Precision zener reference in optocoupler feedback loop controlling primary-side PWM duty cycle. Use Value: 5% tolerance ensures output voltage accuracy within ±0.55 V, meeting Class II no-load regulation standards. | Use Scenario: Stabilizing feedback node of point-of-load regulators in 48 V telecom server power distribution. IC Role / Device Role / Timing Role: Low-impedance voltage reference establishing regulated 12 V intermediate bus from 48 V input. Use Value: 8.0 Ω dynamic impedance minimizes output ripple coupling into sensitive RF subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4741A | Same 11 V nominal zener voltage, but DO-41 through-hole package; 10% tolerance; 1.0 W power rating | Requires PCB through-hole mounting; unsuitable for automated SMT assembly or space-constrained layouts | Select when legacy through-hole compatibility or lower cost outweighs power/size requirements |
| BZX84-C11 | SOT-23 package; 11 V ±5%; 300 mW power; higher dynamic impedance (20 Ω) | Limited surge handling (IZM = 100 mA); not rated for 2.0 W continuous dissipation | Choose only for low-energy signal-line clamping where board area is critical and thermal load is minimal |
Compared with 1N4741A and BZX84-C11, the SMAJ4741E3/TR13 uniquely combines SMT compatibility, 2.0 W power handling, and 5% tolerance in a UL94V-0 package-making it optimal for automotive and industrial applications demanding robust, repeatable clamping under thermal stress.
Availability
SMAJ4741E3/TR13 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom power management systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ4741E3/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
SM Semiconductor is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, and rectifiers, with ISO 9001-certified production and global distribution.
The SMAJ47xxA series is designed specifically for high-reliability DC voltage regulation and transient suppression in automotive, industrial, and telecom infrastructure-emphasizing tight tolerance, thermal robustness, and UL-certified packaging.
FAQ
What is the zener voltage tolerance of SMAJ4741E3/TR13?
The SMAJ4741E3/TR13 has a nominal zener voltage of 11.0 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 10.45 V and 11.55 V when tested at 23.0 mA. This tighter tolerance compared to standard 10% Zeners allows more precise voltage clamping in critical power rails and feedback networks, and is confirmed in Table 1 of the official SM Semiconductor datasheet (Document Number: SMAJ4728A thru SMAJ4751A).
Does SMAJ4741E3/TR13 meet ROHS requirements?
Yes, SMAJ4741E3/TR13 features ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and its void-free thermosetting epoxy body meets UL94V-0 flammability standards-making it suitable for environmentally regulated markets including EU and China RoHS.
What is the maximum surge current rating for SMAJ4741E3/TR13?
The SMAJ4741E3/TR13 is rated for a peak surge current (Izsm) of 414 mA, measured using a 1/2 sine wave pulse of 1/120 second duration at 25°C ambient. This value corresponds to its maximum regulator current (IZM) at 100°C junction temperature and reflects its ability to absorb repetitive transient energy without parametric shift or failure-critical for protecting circuits exposed to inductive switching or ESD events.
Can SMAJ4741E3/TR13 be used in place of SMAJ4741A?
Yes, SMAJ4741E3/TR13 is functionally identical to SMAJ4741A in electrical specifications-including 11.0 V zener voltage, ±5% tolerance, 2.0 W power rating, and SMA package-but differs in packaging format: "E3/TR13" denotes tape-and-reel packaging (13-inch reel) optimized for automated SMT placement, whereas "A" suffix typically indicates bulk or ammo-pack formats. No electrical or thermal redesign is needed when substituting.
What is the thermal resistance junction-to-lead for SMAJ4741E3/TR13?
The thermal resistance junction-to-lead (RθJL) of SMAJ4741E3/TR13 is 25 °C/W, as specified in the Maximum Ratings table. This parameter quantifies how effectively heat transfers from the silicon die to the device's metal leads, enabling direct thermal coupling to PCB copper pours or heatsinks-supporting full 2.0 W power dissipation without additional thermal vias when leads are adequately copper-plated.
SMAJ4741E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 8.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4741E3/TR13 FAQ
1.How can I place an order for SMAJ4741E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4741E3/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 SMAJ4741E3/TR13 reliable?
The price and inventory of SMAJ4741E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4741E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4741E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4741E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4741E3/TR13?
SMAJ4741E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4741E3/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 SMAJ4741E3/TR13?
For technical support, including SMAJ4741E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4741E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4741E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4741E3/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 SMAJ4741E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4741E3/TR13?
All SMAJ4741E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4741E3/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 SMAJ4741E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4741E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4741E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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