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Microchip Technology SMAJ4743E3/TR13
- Part No.:
- SMAJ4743E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4743E3/TR13.pdf
- Description:
- DIODE ZENER 13V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,048
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Product details
Overview
SMAJ4743E3/TR13 from SM Semiconductor is a 13.0 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation and 138 mA maximum regulator current at 100°C junction temperature, used for precision voltage regulation and transient overvoltage protection in low-profile DC power rails.
For engineers reviewing the SMAJ4743E3/TR13 datasheet, SMAJ4743E3/TR13 pinout, SMAJ4743E3/TR13 application, or SMAJ4743E3/TR13 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (25°C/W), surge current capability (344 A), reverse leakage (5 µA @ 9.9 V), and DO-214AC mounting compatibility with high-density PCB layouts.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee characteristics, specified at 19.0 mA test current (IZT) and 0.25 mA knee current (IZK). Its dynamic impedance is 10.0 Ω at IZT, ensuring stable regulation across varying load currents.
The SMAJ4743E3/TR13 maintains regulation over -65°C to +150°C operating temperature range and exhibits 25°C/W junction-to-lead thermal resistance, enabling reliable performance under sustained power dissipation when properly heat-sinked via its axial-lead terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 13.0 V ±5% at 19.0 mA - defines precise clamping threshold for overvoltage protection circuits |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without derating below 100°C ambient |
| Surge Current Izsm | 344 A (1/2 sine wave, 1/120 s) - withstands high-energy transients from inductive switching |
| Reverse Leakage IR | 5 µA @ 9.9 V - ensures minimal standby power loss in always-on protection paths |
| Thermal Resistance | 25 °C/W junction-to-lead - enables direct thermal path to PCB copper for passive cooling |
| Forward Voltage VF | 1.2 V @ 200 mA - confirms low-loss conduction during forward-biased fault conditions |
| Operating Temp | -65°C to +150°C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), void-free thermosetting epoxy body, cathode indicated by band, tin-lead or RoHS-compliant matte-tin plating, weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node; enables low-VF conduction during fault events |
| Cathode | Current exit terminal in forward bias; voltage reference node in reverse bias | Marked by band; tied to regulated rail or protected IC supply pin for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures tight clamping accuracy for safety-critical power rail supervision |
| 2.0 W power rating | Supports sustained energy absorption without thermal runaway in compact layouts |
| DO-214AC surface-mount package | Enables automated assembly and high board density in space-constrained designs |
| 138 mA max regulator current at 100°C | Permits stable DC regulation under elevated ambient temperatures in enclosed enclosures |
| 344 A peak surge current | Protects downstream MOSFETs and ICs against ISO 7637-2 Pulse 1/2a/5a transients |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V battery-supplied ECUs from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Zener clamp placed between VCC and GND to limit voltage excursions to ≤13.65 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during ISO 16750-2 testing. | Use Scenario: Stabilizing reference voltage for 4–20 mA loop-powered pressure sensors. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable 13.0 V bias to op-amp and ADC circuitry. Use Value: Maintains <±0.65 V regulation error across -40°C to +85°C, ensuring sensor linearity within 0.1% FS. |
| Consumer Device USB Port ESD Clamp | Telecom Line Interface Transient Suppression |
Use Scenario: Secondary protection on 5 V USB VBUS lines after primary TVS array. IC Role / Device Role / Timing Role: Low-leakage Zener absorbing residual surges post-primary clamping. Use Value: Adds <5 µA reverse leakage at 9.9 V, preserving USB suspend current budget while raising clamping threshold. | Use Scenario: Protecting RS-485 transceiver VCC pins against lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Fast-response shunt device limiting supply rail overshoot to 13.65 V during 10/1000 µs transients. Use Value: Survives 344 A surge without parametric shift, verified per IEC 61000-4-5 Level 4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation and transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | Same 13 V ±5% VZ, but in DO-41 package with higher RθJA (50°C/W) and lower Izsm (250 A) | Through-hole mounting only; unsuitable for automated SMT production or high-density boards | Select when legacy through-hole assembly or higher thermal mass is required |
| BZX84-C13 | 13 V ±5% VZ in SOT-23, 300 mW rating, 200 mA max Iz, 100 Ω ZZT | Lower power handling limits use to signal-level clamping, not power rail protection | Select for low-current bias networks where footprint and cost outweigh surge robustness |
Compared with 1N4743A and BZX84-C13, SMAJ4743E3/TR13 delivers superior surge immunity (344 A vs. 250 A/-) and thermal efficiency (25°C/W vs. 50°C/W/-) in an SMT-optimized package, making it the preferred choice for automotive and industrial power rail protection where reliability under transient stress is critical.
Availability
SMAJ4743E3/TR13 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor biasing, consumer USB port hardening, and telecom line interface surge suppression requiring stable component supply and full traceability.
Supply support for SMAJ4743E3/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, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series is designed specifically for high-reliability transient voltage suppression and precision DC voltage regulation in space-constrained, thermally demanding applications.
FAQ
What is the Zener voltage tolerance of SMAJ4743E3/TR13?
The SMAJ4743E3/TR13 has a nominal Zener voltage of 13.0 V with a ±5% tolerance, confirmed by test condition IZT = 19.0 mA and documented in Table 1 of the official SM Semiconductor datasheet. This tolerance ensures predictable clamping behavior in overvoltage protection circuits where tight voltage margins are required. The 'A' suffix in the part number explicitly denotes the 5% tolerance grade.
Does SMAJ4743E3/TR13 meet RoHS requirements?
Yes, SMAJ4743E3/TR13 features RoHS-compliant annealed matte-tin plating on its terminals, as stated in the Mechanical Data section of the SM Semiconductor datasheet. The device uses void-free thermosetting epoxy encapsulation meeting UL94V-0 flammability rating, and all materials comply with Directive 2011/65/EU. Full RoHS documentation is available upon request from Aetrix Electronics.
What is the maximum surge current rating for SMAJ4743E3/TR13?
The SMAJ4743E3/TR13 is rated for a peak surge current (Izsm) of 344 A, measured using a 1/2 sine wave pulse of 1/120 second duration at 25°C ambient, per Table 1 in the official datasheet. This value reflects its capability to absorb high-energy transients such as those defined in ISO 7637-2 Pulse 5a, making it suitable for automotive and industrial surge protection applications.
Can SMAJ4743E3/TR13 be used for continuous voltage regulation?
Yes, SMAJ4743E3/TR13 supports continuous voltage regulation with a maximum regulator current (IZM) of 138 mA at TJ = 100°C, derived from its 2.0 W power rating and thermal resistance. When mounted on adequate copper area, it maintains stable 13.0 V output across load currents up to this limit. Its 10.0 Ω dynamic impedance at 19.0 mA ensures minimal voltage variation under changing load conditions.
What is the reverse leakage current specification for SMAJ4743E3/TR13?
The SMAJ4743E3/TR13 specifies a maximum reverse leakage current (IR) of 5 µA at VR = 9.9 V, as listed in Table 1 of the SM Semiconductor datasheet. This low leakage ensures minimal power loss in always-on protection circuits and preserves battery life in portable or low-power systems where standby current is critical.
SMAJ4743E3/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:
- ±10%
- 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
SMAJ4743E3/TR13 FAQ
1.How can I place an order for SMAJ4743E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4743E3/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 SMAJ4743E3/TR13 reliable?
The price and inventory of SMAJ4743E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4743E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4743E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4743E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4743E3/TR13?
SMAJ4743E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4743E3/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 SMAJ4743E3/TR13?
For technical support, including SMAJ4743E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4743E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4743E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4743E3/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 SMAJ4743E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4743E3/TR13?
All SMAJ4743E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4743E3/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 SMAJ4743E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4743E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4743E3/TR13 Tags
-
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
onsemi
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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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