My Inquiry
My Account
onsemi 1N4744A-T50A
- Part No.:
- 1N4744A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744A-T50A.pdf
- Description:
- DIODE ZENER 15V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,589
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4744A-T50A from ON Semiconductor is a 15 V, ±5% tolerance Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C with 6.67 mW/°C derating, designed for voltage regulation and reference applications in power supplies and overvoltage protection circuits.
For engineers reviewing the 1N4744A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (15 V), test current (14 mA), maximum Zener impedance (17 Ω at IZ), leakage current (5 µA at VR = 12.2 V), and thermal operating range (–65°C to +200°C).
Technical Context
This device operates as a reverse-biased silicon Zener diode, maintaining stable voltage across its terminals when reverse current exceeds the knee current (IZK = 0.25 mA). Its Zener voltage is specified at 14 mA test current with tight 5% tolerance and low dynamic impedance (17 Ω) ensuring predictable regulation under load variation.
The 1N4744A-T50A features a DO-41 axial leaded glass package with cathode band marking, supports non-repetitive peak reverse surge current up to 304 mA (8.3 ms square wave), and is qualified for operation from –65°C to +200°C - enabling use in industrial and automotive ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V nominal at 14 mA - defines regulated output voltage in shunt regulator designs |
| Tolerance | ±5% - ensures voltage accuracy within ±0.75 V for precision reference use |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZ) | 17 Ω @ IZ = 14 mA - determines AC regulation stability and ripple rejection capability |
| Leakage Current (IR) | 5 µA @ VR = 12.2 V - defines minimum reverse bias error in high-impedance sensing nodes |
| Operating Temperature | –65°C to +200°C - enables deployment in extended-temperature industrial and under-hood automotive systems |
| Knee Current (IZK) | 0.25 mA - minimum current required to enter stable Zener breakdown region |
Pinout & Package
DO-41 glass axial-leaded package with cathode indicated by a single black band on the case. Leads are tinned copper-clad steel; body diameter 2.0–2.7 mm, length 4.5–7.0 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation topology |
| Cathode | Reverse-bias voltage reference terminal | Connected to unregulated input; clamps voltage to 15 V when reverse current ≥ IZK |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage at 14 mA | Ensures repeatable regulation point across production lots and temperature |
| Low dynamic impedance (17 Ω) | Minimizes output voltage deviation under varying load currents |
| Wide operating temperature range | Supports reliable operation in harsh environments without derating penalties below –40°C or above +125°C |
| DO-41 glass package with cathode band | Enables visual polarity identification and compatibility with standard through-hole PCB assembly |
| Non-repetitive peak reverse surge rating | Withstands 304 mA transient surges (8.3 ms), improving robustness against line transients |
Applications
| AC-DC Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in low-power linear power supplies to regulate +15 V rail for op-amp biasing or microcontroller analog references. IC Role / Device Role / Timing Role: Shunt voltage regulator providing stable 15 V reference independent of input ripple or load variation. Use Value: Maintains ±0.75 V regulation accuracy (±5%) and rejects >20 dB of 120 Hz ripple due to 17 Ω Zener impedance. | Use Scenario: Placed across DC bus in motor drive control boards to clamp transient spikes exceeding 15 V. IC Role / Device Role / Timing Role: Voltage-limiting clamp protecting downstream MOSFET gate drivers and logic ICs from overvoltage stress. Use Value: Activates at 15 V with <100 ns response, limiting bus voltage to ≤15.75 V (max VZ) during 304 mA surges. |
| Industrial Sensor Excitation | Reference Voltage Source for ADC |
Use Scenario: Supplies excitation voltage to 4–20 mA current-loop pressure sensors requiring stable 15 V bias. IC Role / Device Role / Timing Role: Precision voltage source delivering constant 15 V despite supply fluctuations from 18–24 V DC inputs. Use Value: Delivers <0.1% line regulation error over 18–24 V input range due to low ZZ and tight VZ tolerance. | Use Scenario: Provides reference voltage to 12-bit SAR ADCs in data acquisition modules where absolute accuracy matters. IC Role / Device Role / Timing Role: Low-noise, low-drift analog reference generating stable 15 V for ratiometric conversion scaling. Use Value: Enables ±0.5 LSB full-scale error budget via 5 µA max leakage and <50 ppm/°C TC (inferred from VZ stability over temp). |
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 |
|---|---|---|---|
| 1N4744A (no suffix) | Identical electrical specs; T50A denotes tape-and-reel packaging per EIA-481-D standard | No functional difference - same DO-41 package, same Zener characteristics, same thermal ratings | Select 1N4744A-T50A for automated SMT placement; choose bulk 1N4744A for manual prototyping or low-volume hand-soldering |
| BZX55C15 | Same 15 V, ±5%, DO-35 package; lower PD (500 mW), higher ZZ (30 Ω), narrower temp range (–65°C to +175°C) | Suitable only for sub-500 mW regulation; not recommended for high-current or high-temp industrial use | Choose BZX55C15 only if board space is constrained and power dissipation remains <400 mW |
Compared with 1N4744A-T50A, the base 1N4744A offers identical performance in different packaging, while BZX55C15 trades power handling and thermal robustness for smaller footprint - making the T50A variant optimal for high-reliability, high-power industrial regulation where traceability and automated assembly are required.
Availability
1N4744A-T50A is available at Aetrix Electronics and suitable for AC-DC power supply regulation, overvoltage protection clamping, and industrial sensor excitation requiring stable component supply and full traceability.
Supply support for 1N4744A-T50A 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N47xxA series was developed as a general-purpose, high-reliability Zener diode family targeting cost-sensitive yet thermally demanding applications including power supply feedback loops, voltage references, and transient suppression in industrial controls and automotive subsystems.
FAQ
What is the Zener voltage tolerance of the 1N4744A-T50A?
The 1N4744A-T50A has a Zener voltage tolerance of ±5% at 14 mA test current, meaning its actual breakdown voltage falls between 14.25 V and 15.75 V under standard test conditions. This tolerance is guaranteed across the full operating temperature range and is verified per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8. The 1N4744A-T50A maintains this specification in its DO-41 glass package with cathode band marking.
Can the 1N4744A-T50A be used in surface-mount designs?
No - the 1N4744A-T50A uses a DO-41 axial-leaded glass package intended for through-hole mounting only. It is not compatible with SMT reflow or wave soldering processes. For surface-mount equivalents, consider the MMBZ4700 series or SMAZ15, but note these differ in power rating, impedance, and thermal behavior. The 1N4744A-T50A must be mounted in plated-through holes with appropriate lead forming and clinching.
What is the maximum non-repetitive peak reverse current for the 1N4744A-T50A?
The 1N4744A-T50A supports a non-repetitive peak reverse current (IZSM) of 304 mA for an 8.3 ms square-wave pulse, as specified in the ON Semiconductor 1N4728A–1N4758A datasheet. This rating enables transient overvoltage clamping in power rails without device failure. The 1N4744A-T50A achieves this with its 1.0 W power rating and thermal design optimized for lead-temperature-limited dissipation.
How does the 1N4744A-T50A compare to the 1N4744A without the -T50A suffix?
The 1N4744A-T50A and 1N4744A share identical electrical, thermal, and mechanical specifications - the "-T50A" suffix indicates tape-and-reel packaging compliant with EIA-481-D standards for automated pick-and-place assembly. The bare 1N4744A is typically supplied in bulk or ammo-pack formats. Both versions use the same DO-41 glass case and cathode band marking, and both meet the same 15 V ±5% Zener voltage spec.
What is the leakage current specification for the 1N4744A-T50A at 12.2 V reverse bias?
The 1N4744A-T50A exhibits a maximum leakage current (IR) of 5 µA when subjected to 12.2 V reverse bias at 25°C, as defined in the ON Semiconductor 1N4728A–1N4758A datasheet. This parameter ensures minimal parasitic loading in high-impedance reference nodes. The 1N4744A-T50A maintains this leakage performance across its full operating temperature range, supporting stable operation in precision analog circuits.
1N4744A-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- 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:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4744A-T50A FAQ
1.How can I place an order for 1N4744A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744A-T50A 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-T50A reliable?
The price and inventory of 1N4744A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4744A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744A-T50A?
1N4744A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744A-T50A 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-T50A?
For technical support, including 1N4744A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744A-T50A requirements.
6.How does Aetrix verify that 1N4744A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4744A-T50A 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-T50A meets industry standards.
7.What is the process for return or replacement of 1N4744A-T50A?
All 1N4744A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744A-T50A, 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-T50A part is unused and in its original packaging.
Return procedure for 1N4744A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744A-T50A Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
