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Diodes Incorporated 1N4744A-T
- Part No.:
- 1N4744A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744A-T.pdf
- Description:
- DIODE ZENER 15V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
1N4744A-T from Diodes Incorporated is a 1.0 W, 15 V ±5% Zener diode in DO-41 glass package, designed for voltage regulation and reference applications with 14 Ω dynamic impedance at 17 mA test current and -65°C to +175°C operating temperature range. It delivers stable clamping in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N4744A-T datasheet, 1N4744A-T pinout, 1N4744A-T application, or 1N4744A-T equivalent, key selection criteria include nominal Zener voltage (15 V), power dissipation (1.0 W), Zener impedance (14 Ω), reverse leakage (≤5 µA at 11.4 V), and thermal resistance (175 °C/W).
Technical Context
This discrete Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under varying load and input conditions. Its 15 V nominal Zener voltage is specified at 17 mA test current (IZT), with a sharp knee characteristic confirmed by dual-point Zener impedance measurement per DS18007 Rev. 19.
The device exhibits a positive temperature coefficient (+0.055 to +0.09 %/°C) and is rated for 304 mA maximum surge current (8.3 ms waveform). Thermal performance is defined for lead length = 9.5 mm at TL = 50°C, with junction-to-ambient thermal resistance of 175 °C/W at TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V ±5% at IZT = 17 mA - defines precise regulation point for feedback or reference circuits |
| Power Dissipation (Pd) | 1.0 W at TA = 25°C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 14 Ω at IZT = 17 mA - indicates low AC impedance for stable regulation under dynamic load changes |
| Reverse Leakage (IR) | ≤5 µA at VR = 11.4 V - ensures minimal standby current in high-impedance bias networks |
| Surge Current (IZS) | 304 mA (8.3 ms) - supports transient overvoltage clamping without failure |
| Temp Coefficient (TC) | +0.055 to +0.09 %/°C - quantifies voltage drift with temperature for precision reference design |
| Thermal Resistance (RθJA) | 175 °C/W - determines junction temperature rise above ambient under given power dissipation |
Pinout & Package
Package: DO-41 glass case, UL 94V-0 rated, cathode band marking, Sn96.5Ag3.5 terminations, 0.35 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; supplies regulated 15 V when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| 1.0 W Power Rating | Enables use in medium-power regulation without external heatsinking in standard PCB layouts |
| ±5% Zener Tolerance | Supports cost-sensitive designs where tight voltage accuracy is not required (e.g., non-precision power rails) |
| DO-41 Glass Package | Provides robust mechanical integrity and hermetic-like moisture resistance for industrial environments |
| RoHS-Compliant Finish | Meets EU Directive 2002/95/EC with Sn96.5Ag3.5 solderable terminations per MIL-STD-202 Method 208 |
| Wide Operating Range | -65°C to +175°C junction temperature enables deployment in automotive under-hood and industrial control systems |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-based feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side regulation circuit. Use Value: 15 V rating matches common TL431 bias requirements; 14 Ω ZZT minimizes regulation error during load transients. | Use Scenario: Placed across sensitive IC inputs to limit voltage spikes from ESD or inductive switching. IC Role / Device Role / Timing Role: Passive clamping device shunting excess energy to ground during transient events. Use Value: 304 mA 8.3 ms surge rating absorbs IEC 61000-4-5 Level 3 surges without degradation. |
| Industrial Sensor Biasing | Reference Voltage Source |
Use Scenario: Provides stable bias voltage for analog sensor signal conditioning circuits in PLC modules. IC Role / Device Role / Timing Role: Precision DC reference for op-amp gain-setting networks and ADC reference dividers. Use Value: +0.055 to +0.09 %/°C TC allows predictable drift compensation in 0–70°C operating range. | Use Scenario: Serves as primary voltage reference in low-cost microcontroller-based power monitors. IC Role / Device Role / Timing Role: Standalone Zener reference replacing more expensive IC references where 5% tolerance is acceptable. Use Value: 1.0 W rating supports direct connection to unregulated 24 V rails with series resistor; DO-41 footprint simplifies layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A-A | Same electrical specs; packaged in 5K ammo pack instead of tape-and-reel | No functional difference; suited for manual or semi-automated assembly | Select for prototyping or low-volume hand-soldered builds |
| DFLZ15-7 | Surface-mount SOD-123FL package; 15 V, 1 W, 5% tolerance; 12 Ω Zener impedance | Requires PCB rework for SMT placement; lower profile and better thermal coupling to copper | Select for space-constrained or automated SMT production requiring RoHS-compliant alternatives |
Compared with 1N4744A-T, the 1N4744A-A offers identical performance in through-hole ammo packaging, while DFLZ15-7 provides modern SMT compatibility with marginally lower impedance but different thermal and layout integration requirements.
Availability
1N4744A-T is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection clamp, and industrial sensor biasing requiring stable component supply and long-term obsolescence management.
Supply support for 1N4744A-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 components for industrial, computing, and consumer markets.
The 1N47xxA series belongs to Diodes' legacy Zener diode product line, engineered for general-purpose voltage regulation and reference applications where cost, reliability, and wide temperature operation are prioritized over ultra-low impedance or tight tolerance.
FAQ
What is the maximum reverse leakage current for 1N4744A-T at 11.4 V?
The maximum reverse leakage current is 5.0 µA at VR = 11.4 V and TA = 25°C, as specified in the Electrical Characteristics table of DS18007 Rev. 19. This value ensures minimal quiescent current draw in high-impedance bias networks and contributes to stable reference behavior under light-load conditions.
Is 1N4744A-T suitable for surface-mount assembly?
No, 1N4744A-T uses the DO-41 axial-leaded glass package and is intended for through-hole mounting only. For surface-mount equivalents, consider the DFLZ15-7 in SOD-123FL package, which shares the same 15 V Zener voltage and 1 W rating but features SMT-compatible terminals and slightly lower Zener impedance.
What does the "-T" suffix indicate in 1N4744A-T?
The "-T" suffix denotes tape-and-reel packaging: 5,000 units per reel in DO-41 glass configuration. This format supports automated pick-and-place assembly and is distinct from the "-A" (ammo pack) variant. Both share identical electrical and thermal specifications per Diodes Incorporated's ordering information.
Why is 1N4744A-T marked "Not Recommended for New Design"?
Diodes Incorporated recommends DFLZxx devices for new designs due to superior thermal performance, smaller footprint, and enhanced manufacturability of SMT packages. The 1N4744A-T remains fully functional and supported for legacy repair, maintenance, and through-hole production where DO-41 compatibility is required.
1N4744A-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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 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
1N4744A-T FAQ
1.How can I place an order for 1N4744A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744A-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 1N4744A-T reliable?
The price and inventory of 1N4744A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744A-T is usually 5 days.
3.What payment methods are accepted for 1N4744A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744A-T?
1N4744A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744A-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 1N4744A-T?
For technical support, including 1N4744A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744A-T requirements.
6.How does Aetrix verify that 1N4744A-T is sourced from the original manufacturer or authorized distributors?
All 1N4744A-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 1N4744A-T meets industry standards.
7.What is the process for return or replacement of 1N4744A-T?
All 1N4744A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744A-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 1N4744A-T part is unused and in its original packaging.
Return procedure for 1N4744A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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