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Diodes Incorporated 1N4743A-T
- Part No.:
- 1N4743A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743A-T.pdf
- Description:
- DIODE ZENER 13V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:3,021
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Product details
Overview
1N4743A-T from Diodes Incorporated is a 13 V, 1.0 W silicon Zener diode in DO-41 glass package, rated for 19 mA test current (IZT), 10 Ω maximum Zener impedance at IZT, and ±5% nominal voltage tolerance, used for precision voltage regulation and reference in low-power linear power supplies and analog circuit biasing.
For engineers reviewing the 1N4743A-T datasheet, 1N4743A-T pinout, 1N4743A-T application, or 1N4743A-T equivalent, this part serves as a standard through-hole Zener reference with verified thermal resistance (175 °C/W), defined surge rating (344 mA @ 8.3 ms), and RoHS-compliant Sn96.5Ag3.5 terminations suitable for industrial and consumer PCB-level voltage clamping.
Technical Context
This device operates in reverse breakdown mode to maintain stable DC voltage across its terminals under varying load and input conditions. Its Zener voltage exhibits a positive temperature coefficient (+0.05 to +0.085 %/°C), enabling predictable drift behavior in temperature-sensitive references.
The 1N4743A-T delivers regulated output at 13 V with 10 Ω dynamic impedance at 19 mA, supporting low-noise analog circuits where tight voltage stability and minimal AC impedance are required. It is not intended for high-frequency or transient suppression applications due to inherent junction capacitance (~15 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V nominal, ±5% tolerance - defines precise regulation point for feedback loops and reference rails |
| Test Current (IZT) | 19 mA - operating point at which VZ and ZZT are specified; sets minimum bias requirement |
| Zener Impedance (ZZT) | 10 Ω max at IZT - ensures low AC impedance for stable regulation under small-signal variations |
| Power Dissipation (Pd) | 1.0 W @ TA = 25°C - limits continuous DC power handling; derates linearly above 50°C |
| Thermal Resistance (RθJA) | 175 °C/W - determines junction temperature rise under ambient conditions with standard lead length |
| Surge Current (IZS) | 344 mA @ 8.3 ms - defines single-pulse energy handling capability per IEC 61000-4-5 waveform |
| Reverse Leakage (IR) | 5.0 µA max @ VR = 9.9 V - quantifies off-state conduction loss below breakdown threshold |
Pinout & Package
Package: DO-41 glass axial-leaded case, UL 94V-0 rated, cathode identified by band marking, weight ≈ 0.35 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower potential side in regulation configuration; forms reference node with cathode |
| Cathode | Zener breakdown terminal / voltage regulation output | Connected to higher potential side; maintains 13 V relative to anode during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| 1.0 W Power Rating | Enables use in mid-range analog references without forced cooling or oversized heatsinking |
| ±5% Voltage Tolerance | Provides cost-effective precision for non-critical voltage references where tighter tolerance is unnecessary |
| Sn96.5Ag3.5 Termination | Ensures reliable solderability per MIL-STD-202 Method 208 and compatibility with lead-free reflow profiles |
| +0.05 to +0.085 %/°C Tempco | Allows predictable voltage drift compensation in temperature-stable reference designs |
Applications
| Linear Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in discrete 78xx-style regulator feedback networks or shunt-regulated SMPS auxiliary supplies. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 13 V reference to error amplifier inputs. Use Value: Maintains ±1% output regulation over line/load variation using only passive components and known Zener characteristics. | Use Scenario: Protecting microcontroller I/O pins or ADC inputs from transient overvoltage events in industrial sensor interfaces. IC Role / Device Role / Timing Role: Passive clamp limiting voltage to 13 V before reaching sensitive downstream circuitry. Use Value: Absorbs up to 344 mA surge pulses (8.3 ms) without failure, preventing latch-up or gate oxide damage. |
| Temperature-Compensated Reference | Analog Circuit Biasing |
Use Scenario: Building two-Zener temperature-compensated references (e.g., paired with 1N4733A) for stable 5–10 V outputs over -40°C to +85°C. IC Role / Device Role / Timing Role: Positive-tempco element balancing negative-tempco Zeners in series reference strings. Use Value: Achieves <±50 ppm/°C drift in composite references by leveraging its +0.05 to +0.085 %/°C coefficient. | Use Scenario: Setting bias points for op-amp input stages, transistor amplifiers, or comparator hysteresis thresholds. IC Role / Device Role / Timing Role: Fixed-voltage node generator establishing DC operating points independent of supply variation. Use Value: Provides repeatable 13 V bias with <10 Ω dynamic impedance, minimizing signal-dependent offset shifts. |
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 |
|---|---|---|---|
| 1N4743A-A | Identical electrical specs; differs only in DO-41 packaging format (ammo pack vs. tape & reel) | No functional difference; selection driven solely by assembly method (manual vs. pick-and-place) | Choose -A for hand-soldering or low-volume prototyping; -T for automated SMT line compatibility |
| DFLZ13-7 | Surface-mount SOD-123FL package; same 13 V, 1 W rating but lower RθJA (200 °C/W), tighter 2% tolerance, and faster response | Better suited for space-constrained PCBs and higher-density layouts; requires reflow-compatible footprint | Select when board area is limited or when tighter initial tolerance and improved thermal performance justify SMT transition |
Compared with 1N4743A-A, the -T variant enables automated placement and consistent reel-based logistics; versus DFLZ13-7, the 1N4743A-T offers legacy through-hole compatibility and broader thermal margin in free-air environments but lacks SMT scalability.
Availability
1N4743A-T is available at Aetrix Electronics and suitable for linear power supply references, overvoltage clamping, analog biasing, and temperature-compensated reference designs requiring stable component supply and long-term obsolescence management.
Supply support for 1N4743A-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-standard components for power management, signal integrity, and protection.
The 1N47xxA series belongs to Diodes' legacy Zener diode product line, designed specifically for general-purpose voltage regulation, reference, and clamping in cost-sensitive, medium-power analog and power supply applications.
FAQ
What is the maximum continuous power dissipation for 1N4743A-T at 70°C ambient?
At 70°C ambient, the 1N4743A-T must be derated from its 1.0 W rating at 25°C. Derating begins at 50°C at 6.67 mW/°C, so at 70°C the allowable power is 1.0 W − (20°C × 6.67 mW/°C) = 866.6 mW. This assumes leads are held at 50°C with 9.5 mm length from case per datasheet Note 1.
Is 1N4743A-T suitable for use as a voltage reference in precision ADC circuits?
It can serve as a basic reference in non-precision applications, but its ±5% tolerance, +0.05 to +0.085 %/°C tempco, and 10 Ω dynamic impedance limit accuracy. For 12-bit+ ADCs, dedicated bandgap or buried-Zener references with <0.1% tolerance and <10 ppm/°C drift are recommended instead.
How does the DO-41 package affect thermal performance compared to SMD alternatives?
The DO-41 package has a junction-to-ambient thermal resistance of 175 °C/W in free air, significantly higher than SMD packages like SOD-123FL (≈200 °C/W on 1-in² copper). However, DO-41's axial leads allow direct heat sinking via lead bending or chassis mounting, enabling better real-world thermal management in through-hole assemblies.
Why is 1N4743A-T marked "Not Recommended for New Design"?
This designation reflects Diodes Incorporated's strategic shift toward surface-mount alternatives like the DFLZ series, which offer tighter tolerances, smaller footprints, and improved manufacturability. The 1N4743A-T remains fully qualified and supported, but new designs are encouraged to adopt modern SMT equivalents for long-term supply assurance and assembly efficiency.
1N4743A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 1 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:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4743A-T FAQ
1.How can I place an order for 1N4743A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743A-T 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 1N4743A-T reliable?
The price and inventory of 1N4743A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743A-T is usually 5 days.
3.What payment methods are accepted for 1N4743A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743A-T?
1N4743A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743A-T 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 1N4743A-T?
For technical support, including 1N4743A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743A-T requirements.
6.How does Aetrix verify that 1N4743A-T is sourced from the original manufacturer or authorized distributors?
All 1N4743A-T 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 1N4743A-T meets industry standards.
7.What is the process for return or replacement of 1N4743A-T?
All 1N4743A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743A-T, 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 1N4743A-T part is unused and in its original packaging.
Return procedure for 1N4743A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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