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Microchip Technology SMAJ4743CE3/TR13
- Part No.:
- SMAJ4743CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4743CE3/TR13.pdf
- Description:
- DIODE ZENER 13V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
SMAJ4743CE3/TR13 from SM Semiconductor is a 13.0 V, ±2% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation and 344 mA maximum regulator current at 100°C, used for precision voltage regulation and transient overvoltage protection in low-profile DC power rails.
For engineers reviewing the SMAJ4743CE3/TR13 datasheet, SMAJ4743CE3/TR13 pinout, SMAJ4743CE3/TR13 application, or SMAJ4743CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (25°C/W), reverse leakage (5 µA @ 9.9 V), surge current capability (344 mA), and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a silicon-based Zener voltage regulator with sharp breakdown knee characteristics confirmed by dual-point impedance measurement per MIL-STD-750 Method 2026. It maintains stable regulation across -65°C to +150°C operating temperature range and supports high-density mounting via axial-lead SMA package.
Zener impedance is measured at 10% of test current (IZT = 19.0 mA) using 60 Hz AC superimposed on DC bias; dynamic impedance is 10.0 Ω, and knee impedance is 700 Ω at IZK = 0.25 mA - ensuring predictable turn-on behavior under low-current conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 13.0 V ±2% at 19.0 mA test current - enables precise reference generation in feedback loops |
| Power Dissipation PM(AV) | 2.0 W steady-state - supports continuous regulation without forced cooling in compact layouts |
| Max Regulator Current IZM | 138 mA at TL = 100°C - defines usable current headroom under thermal stress |
| Reverse Leakage IR | 5 µA @ VR = 9.9 V - ensures minimal standby power loss in always-on circuits |
| Thermal Resistance RθJL | 25 °C/W junction-to-lead - allows direct thermal path to PCB copper for passive heat management |
| Surge Current Izsm | 344 mA (1/2 sine wave, 1/120 s) - withstands repetitive inductive switching transients |
| Forward Voltage VF | 1.2 V @ 200 mA - confirms low-loss conduction in forward-biased clamp configurations |
Pinout & Package
Package: SMA (DO-214AC), void-free thermosetting epoxy case meeting UL94V-0; cathode indicated by band; 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 in Zener mode | Provides low-resistance path (<1.2 V drop) when forward-conducting; must be routed with adequate current-carrying trace width |
| Cathode | Current exit terminal in forward bias; connected to higher-potential node in Zener mode | Acts as regulated output node in shunt configuration; band-marked end requires unambiguous silkscreen identification |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter regulation than standard 5% or 10% parts - critical for feedback-sensing accuracy in LDOs and DC-DC converters |
| 25°C/W junction-to-lead thermal resistance | Permits direct thermal coupling to PCB copper pour without heatsink - reduces board area and assembly cost |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation during reflow, meeting IPC-J-STD-006B solderability requirements |
| Sharp knee impedance profile (ZZK = 700 Ω @ 0.25 mA) | Guarantees stable turn-on at low currents - avoids erratic regulation in battery-powered or sleep-mode circuits |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Power Rail |
|---|---|
Use Scenario: Protecting analog front-end inputs of 12-bit ADCs from ESD and load-dump spikes in factory-floor sensor nodes. IC Role / Device Role / Timing Role: Shunt voltage clamp placed between signal line and ground, activated only during overvoltage events. Use Value: Limits transient excursions to ≤13.0 V × 1.02 = 13.26 V, preserving ADC input stage integrity without affecting normal 0–5 V operation. | Use Scenario: Stabilizing 12 V supply rail feeding microcontroller I/O banks in door module ECUs exposed to alternator ripple and relay bounce. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining reference stability across temperature and aging. Use Value: Maintains ±2% regulation over -40°C to +125°C ambient, reducing firmware calibration frequency in production units. |
| Telecom Line Interface Protection | Consumer USB-C Power Delivery Feedback Loop |
Use Scenario: Safeguarding RS-485 transceiver VCC pins against lightning-induced surges on outdoor data links. IC Role / Device Role / Timing Role: Primary overvoltage clamp absorbing energy from fast-rising transients before reaching IC substrate. Use Value: Withstands 344 mA surge current (1/2 sine, 1/120 s), exceeding IEC 61000-4-5 Level 3 requirement for telecom infrastructure. | Use Scenario: Providing accurate 13.0 V reference for error amplifier in USB-C PD sink controller feedback network. IC Role / Device Role / Timing Role: Precision voltage reference source in closed-loop regulation path. Use Value: ±2% tolerance ensures PD negotiation remains within USB-IF spec limits even after 1000-hour life testing at 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | 13 V ±5% tolerance; DO-41 package; 1.0 W rating; RθJL = 50°C/W | Lower precision and power handling; unsuitable for high-density or thermally constrained designs | Select when cost sensitivity outweighs regulation accuracy and thermal performance |
| BZX84-C13 | 13 V ±5% tolerance; SOT-23 package; 300 mW rating; no specified surge current | Surface-mount only; limited surge robustness; not rated for industrial transients | Choose for space-constrained consumer PCBs where transient immunity is secondary |
Compared with 1N4743A and BZX84-C13, SMAJ4743CE3/TR13 delivers tighter voltage control (±2% vs ±5%), double the power rating (2.0 W vs 1.0 W / 0.3 W), and validated surge endurance - making it the preferred choice for automotive, industrial, and telecom applications requiring long-term reliability under electrical stress.
Availability
SMAJ4743CE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, telecom line interface protection, and USB-C power delivery feedback loops requiring stable component supply and traceable sourcing.
Supply support for SMAJ4743CE3/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 transient voltage suppression and precision DC voltage regulation in harsh environments - emphasizing thermal robustness, tight tolerance, and repeatable surge performance.
FAQ
What is the Zener voltage tolerance of SMAJ4743CE3/TR13?
The SMAJ4743CE3/TR13 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. This means its nominal 13.0 V breakdown voltage is guaranteed between 12.74 V and 13.26 V at 19.0 mA test current and 25°C ambient. This tighter tolerance supports precision regulation tasks where standard ±5% Zeners would introduce unacceptable error margins in feedback networks or reference circuits.
Does SMAJ4743CE3/TR13 meet ROHS requirements?
Yes, SMAJ4743CE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The SMA (DO-214AC) package employs void-free thermosetting epoxy meeting UL94V-0 flammability standards. Full compliance documentation, including material declarations and test reports, is available upon request from Aetrix Electronics for design validation and audit purposes.
What is the maximum surge current rating for SMAJ4743CE3/TR13?
The SMAJ4743CE3/TR13 is rated for a peak surge current (Izsm) of 344 mA, measured using a 1/2 sine wave pulse of 1/120 second duration at 25°C ambient. This value reflects its ability to absorb transient energy from inductive switching or ESD events without degradation. It exceeds typical IEC 61000-4-5 Level 2 requirements and supports use in automotive and industrial environments where repetitive surges occur.
Can SMAJ4743CE3/TR13 be used in surface-mount assemblies?
Yes, SMAJ4743CE3/TR13 uses the SMA (DO-214AC) surface-mount package with gull-wing leads compatible with standard reflow profiles. Its 0.3 g mass and ROHS-compliant matte-tin plating ensure reliable wetting and joint formation. Designers should observe JEDEC J-STD-020 moisture sensitivity level (MSL) guidelines and apply appropriate pre-bake if stored beyond MSL limits before reflow.
How does the thermal resistance of SMAJ4743CE3/TR13 affect PCB layout?
The SMAJ4743CE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25°C/W, meaning efficient heat transfer relies on direct copper connection to its leads. For optimal thermal performance, designers should attach both anode and cathode pads to ≥10 mm² internal or external copper pours, avoid thermal isolation, and minimize trace length between device and ground/power planes - enabling full 2.0 W dissipation without active cooling.
SMAJ4743CE3/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):
- 13 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.9 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
SMAJ4743CE3/TR13 FAQ
1.How can I place an order for SMAJ4743CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4743CE3/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 SMAJ4743CE3/TR13 reliable?
The price and inventory of SMAJ4743CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4743CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4743CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4743CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4743CE3/TR13?
SMAJ4743CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4743CE3/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 SMAJ4743CE3/TR13?
For technical support, including SMAJ4743CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4743CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4743CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4743CE3/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 SMAJ4743CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4743CE3/TR13?
All SMAJ4743CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4743CE3/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 SMAJ4743CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4743CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4743CE3/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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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