1N4744A-T50A - 15V 1W Zener Diode DO-41 | Single Zener
Référence : 1N4744A-T50A ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.18 | $0,18 |
| 10 | $0.14 | $1,40 |
| 100 | $0.09 | $9,00 |
| 500 | $0.07 | $35,00 |
| 1 000 | $0.05 | $50,00 |
| 5 000 | $0.04 | $200,00 |
1N4744A-T50A Présentation
A Zener diode is a specialized pn-junction diode engineered to operate in the reverse-breakdown (Zener) region, where the voltage across the device remains nearly constant over a wide range of reverse current. This makes Zener diodes the building blocks of shunt voltage regulators, precision references, and overvoltage protection clamps. Within the discrete semiconductor hierarchy, Zener diodes belong to the diodes family, sit alongside TVS diodes, Schottky diodes, and rectifier diodes, and form the simplest, lowest-noise class of reference voltage source used in analog and power-conversion circuits.
Key features include a nominal working voltage of 15 V at a test current of 17 mA, ±5% voltage tolerance for the A-suffix series, 1 W maximum DC power dissipation at TL = 50 °C with 3/8 inch lead length (derated above 50 °C), and a broad -65 °C to +175 °C operating and storage temperature range. The silicon-oxide passivated junction delivers stable long-term voltage characteristics under continuous bias. The -T50A suffix denotes an ammo-pack tape-and-axial reel configuration, optimized for automatic through-hole insertion.
The 1N4744A-T50A utilizes a hermetically sealed glass envelope (DO-41 / SOD66) that protects the silicon die against humidity and mechanical stress, while the axial leads simplify PCB layout and heatsinking through copper trace area on each pad. Compared to surface-mount equivalents, the DO-41 package delivers higher intrinsic power dissipation per unit and easier prototyping on perfboard and breadboards.
Typical applications include 15 V shunt voltage regulators in analog signal-conditioning circuits, overvoltage protection clamps on sensor and signal lines, reference voltage sources for ADCs, bias supplies for transistor and op-amp stages, and DC voltage step-down from higher rails. It is also widely used as a precision clamp for PCBs and as a reference for low-power instrumentation.
When designing with this part, observe the 1 W power derating curve above 50 °C lead temperature, keep lead length short to maximize heat conduction into the PCB, and provide adequate copper pad area on both anode and cathode sides to sustain continuous dissipation. For tighter tolerance or surface-mount requirements, consider 1N4744A in SMA/SMB equivalents.
This page consolidates distributor pricing, drop-in alternative MPNs, and practical design notes that extend beyond the manufacturer datasheet for the 1N4744A-T50A.
Alternatives de remplacement direct pour 1N4744A-T50A — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec 1N4744A-T50A (même facteur de forme et même empreinte) — différant par Package, Power Dissipation (Pd), RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
1N4744A
✅ Remplacement direct✓ En stock
$0.09 / unité
Voir la fiche technique →1N4744A-TAP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
1N4744A-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
1N4744A
✅ Remplacement direct✓ En stock
$0.09 / unité
Voir la fiche technique →BZX85C15
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
1N4744A-T50A Valeurs maximales et caractéristiques électriques
| Diode Type | Zener (Voltage Regulator) |
| Nominal Zener Voltage (Vz) | 15 V |
| Voltage Tolerance | ±5% |
| Zener Test Current (Izt) | 17 mA |
| Maximum Zener Impedance (Zzt) at Izt | 14 Ω |
| Maximum Zener Impedance (Zzk) at 0.25 mA | 700 Ω |
| Maximum Forward Voltage (Vf) at 200 mA | 1.2 V |
| Power Dissipation (Pd) | 1 W (at TL = 50 °C, lead length 3/8") |
| Operating and Storage Temperature Range | -65 °C to +175 °C |
| Boîtier | DO-41 (SOD66), Axial-Lead Glass |
| Type de montage | Through Hole |
| Packaging | Ammo Pack (Tape & Axial Reel, -T50A suffix) |
| Junction Passivation | Silicon-Oxide Passivated |
| Configuration | Single, Axial-Leaded Hermetic Glass |
| Statut RoHS | Compliant |
Configuration des broches de 1N4744A-T50A
| Broche 1 | Cathode — Banded end; cathode of the Zener diode |
| Broche 2 | Anode — Unbanded end; anode of the Zener diode |
Applications typiques
1N4744A-T50A convient pour 6 applications: 15 V Shunt Voltage Regulator, Overvoltage Clamp for Sensor and Signal Lines, Precision Voltage Reference Bias, Transistor and Op-Amp Stage Bias Supply, Industrial 24 V Bus Voltage Reference, Hobby and Prototyping Reference.
15 V Shunt Voltage Regulator
The 1N4744A-T50A's 15 V nominal Zener voltage at 17 mA test current and ±5% tolerance make it ideal as a low-noise shunt regulator in analog front-end and instrumentation power trees. Placed between the supply rail and ground with a series resistor (typically 470 Ω–1 kΩ at 15 V supply), it clamps the load to ~15 V with sub-millivripple output, far cleaner than any switching preregulator. Unlike op-amp references, the Zener needs no quiescent current compensation, and the 1 W dissipation budget allows sustained loads of 10–20 mA.
Recommandé
Overvoltage Clamp for Sensor and Signal Lines
With 1.2 V maximum forward voltage at 200 mA and 14 Ω Zener impedance, the 1N4744A-T50A provides effective low-energy clamping on ADC inputs, op-amp rails, and sensor signal lines that may see transients above the 15 V rail. The hermetic DO-41 glass package resists humidity-induced drift, making it suitable for industrial and outdoor sensor interfaces. Designers pair it with a series PTC or ferrite for high-energy transient robustness, leveraging the Zener for fast sub-microsecond response.
Recommandé
Precision Voltage Reference Bias
The 1N4744A-T50A delivers a stable 15 V reference when biased at 5–20 mA, suitable for op-amp supply rails, instrumentation-amp reference nodes, and ADC reference ladders. Its ±5% tolerance can be trimmed to ±1% with a series resistor pair, and the 14 Ω Zener impedance gives a temperature coefficient of typically <0.05%/°C at the 17 mA test point. Compared to bandgap IC references, this Zener offers no minimum load requirement and tolerates capacitor-fed dynamic loads.
Recommandé
Transistor and Op-Amp Stage Bias Supply
In discrete transistor amplifier designs, the 1N4744A-T50A serves as a 15 V bias rail for Class-A amplifier collector loads, JFET drain bias, and op-amp dual-rail midpoint generation. Its 1 W dissipation budget at 50 °C lead temperature is sufficient for powering single-stage preamps and small-signal buffers. The DO-41 axial leads accept standard through-hole PCB pads, simplifying repair and rework in vintage and DIY audio designs.
Recommandé
Industrial 24 V Bus Voltage Reference
Industrial 24 V PLC and sensor-bus systems often require a 15 V reference derived via series resistor and Zener clamp. The 1N4744A-T50A at 1 W handles continuous 17 mA loads with margin for transient absorption. Its -65 °C to +175 °C operating range covers outdoor and cabinet-mounted equipment. Compared to active 15 V regulator ICs, the Zener requires only two components and provides inherent short-circuit tolerance when properly resistor-limited.
Recommandé
Hobby and Prototyping Reference
The 1N4744A-T50A is a staple part on breadboards, perfboards, and educational electronics kits because of its through-hole DO-41 form factor, easy hand-soldering, and forgiving 1 W power budget. The -T50A ammo packaging supports volume production but the same electrical die ships in bulk (1N4744A) and tape-and-ammo (1N4744A-TAP) variants. Hobbyists and repair technicians value the DO-41 axial package as a universal Zener footprint compatible with hundreds of legacy designs.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour 1N4744A-T50A — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 1N4744A | 1N4744A-TAP | 1N4744A-T | 1N4744A (NXP) | BZX85C15 |
|---|---|---|---|---|---|---|
| Package | DO-41 (SOD66) | DO-41 (SOD66) - same | DO-41 (SOD66) - same | DO-41 (SOD66) - same | DO-41 (SOD66) - same | DO-41 (SOD66) - same |
| Brand | onsemi | onsemi | onsemi | onsemi | NXP Semiconductors | Vishay Intertechnology |
| Nominal Zener Voltage | 15 V | 15 V | 15 V | 15 V | 15 V | 15 V |
| Power Dissipation | 1 W | 1 W | 1 W | 1 W | 1 W | 1.3 W |
| Voltage Tolerance | ±5% | ±5% | ±5% | ±5% | ±5% | ±5% |
| Shipping Form | Ammo Pack (-T50A) | Bulk | Tape & Ammo (-TAP) | Tape & Reel (-T) | Bulk / Ammo | Bulk / Ammo |
Principaux différenciateurs
- Industry-standard JEDEC 1N4744A registration with broad cross-brand second-sourcing (vs BZX85C15)
- Ammo-pack -T50A shipping form for high-volume assembly (vs 1N4744A (bulk))
- Wide -65 °C to +175 °C operating range (vs BZX85C15)
Notes de conception
Estimated: at Vz = 15 V and Izt = 17 mA, the 1N4744A-T50A dissipates approximately 255 mW (Vz × Iz) under typical bias, well within the 1 W rating at TL = 50 °C. To sustain continuous operation, keep lead length to 3/8 inch or less and provide at least 100 mm² of copper pad area on each lead for heat conduction. Derate linearly to zero at TL = 175 °C.
For through-hole Zener diodes in DO-41 packages, use a 1.6 mm or larger pad PCB and metal standoff to maximize thermal conduction into the copper pour. Bend leads minimally to avoid stress on the glass seal. Maintain at least 2 mm spacing between the body and adjacent components for airflow and rework clearance.
Avoid operating the 1N4744A-T50A below its Zener knee current (~1 mA for 15 V), as regulation becomes soft and impedance rises sharply. Always place a series current-limiting resistor to set Iz between 5–25 mA for stable regulation. Do not exceed the 1 W power rating at elevated ambient temperatures without derating.
Informations de conformité
RoHS and lead-free per onsemi product page; REACH compliant. AEC-Q100 not applicable for through-hole discrete Zener diodes. Halogen-free status not explicitly stated in the verified data.
