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DL4729A
Rectron USA
DIODE ZENER 3.6V 1W LL-41
5457 Pcs New Original In Stock
Zener Diode 3.6 V 1 W ±5% Surface Mount DO-213AB (MELF, LL41)
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5.0 / 5.0
- (34 Ratings)
DL4729A
Product Overview
12950234
DiGi Electronics Part Number
DL4729A-DGManufacturer
Rectron USA
DL4729A
Description
DIODE ZENER 3.6V 1W LL-41Inventory
5457 Pcs New Original In Stock
Zener Diode 3.6 V 1 W ±5% Surface Mount DO-213AB (MELF, LL41)
Quantity
Minimum 1
Minimum 1
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DL4729A Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
3.6 V
Tolerance
±5%
Power - Max
1 W
Current - Reverse Leakage @ Vr
100 µA @ 1 V
Operating Temperature
-
Mounting Type
Surface Mount
Package / Case
DO-213AB, MELF (Glass)
Supplier Device Package
DO-213AB (MELF, LL41)
Datasheet & Documents
Datasheets
Download DL4729A Product Specification (PDF)
HTML Datasheet
DL4729A-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH info available upon request
ECCN
EAR99
HTSUS
8541.10.0080
Additional Information
Other Names
2516-DL4729ATR
Standard Package
4,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
Die Qualität der Verpackung und der Service bei DiGi Electronics überzeugen auf ganzer Linie.
грудня 02, 2025
Having a trusted supplier like DiGi Electronics with ample inventory gives us a competitive edge.
грудня 02, 2025
Swift shipping process, I was kept informed every step of the way.
грудня 02, 2025
Reliable delivery timing helps us maintain our own schedules.
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Frequently Asked Questions (FAQ)
Can the DL4729A Zener diode be safely used in a 3.3V low-power microcontroller reset circuit, and what are the risks of relying on its ±5% tolerance for accurate brown-out detection?
The DL4729A has a nominal Zener voltage of 3.6V with ±5% tolerance, meaning it can range from 3.42V to 3.78V—higher than typical 3.3V MCU brown-out thresholds (often 3.0V–3.2V). Using it directly as a voltage reference for reset logic risks false triggering or failure to detect undervoltage, especially near the lower end of its range. For reliable operation, pair the DL4729A with a comparator or supervisory IC that includes hysteresis, or consider a tighter-tolerance Zener like the BZX84C3V6 (±2%) for more predictable clamping behavior in precision applications.
Is the DL4729A a suitable drop-in replacement for the BZX84C3V6 in a 1W surface-mount Zener clamp circuit, and what layout or thermal considerations should I account for?
While both the DL4729A and BZX84C3V6 are 3.6V, 1W Zener diodes in SMD packages, they are not direct drop-in replacements due to package differences: the DL4729A uses DO-213AB (MELF, LL41), while the BZX84C3V6 typically uses SOT-23, which has lower thermal mass and different pad geometry. Mismatched footprints require PCB layout changes. Additionally, the DL4729A’s glass MELF construction offers better surge handling and thermal stability than plastic SOT-23 parts, making it preferable in high-reliability or transient-prone environments—but verify pad compatibility and reflow profiles to avoid solder joint stress during assembly.
How does the reverse leakage current of the DL4729A (100 µA @ 1V) impact power consumption in a battery-powered sensor node with a 3.6V rail, and can this affect sleep-mode efficiency?
At 100 µA of reverse leakage at just 1V bias, the DL4729A may draw significant quiescent current when reverse-biased in a 3.6V rail protection or reference role—especially in always-on circuits. In a battery-powered sensor node with µA-level sleep currents, this leakage alone could dominate total power budget and reduce battery life by 10–20%. For ultra-low-power designs, consider lower-leakage alternatives like the MMSZ5226BT1G (typically <1 µA @ 1V) or use the DL4729A only in non-critical clamping paths where leakage is acceptable, and isolate it via series resistors or MOSFET switches during sleep modes.
What derating guidelines should I follow when using the DL4729A in an industrial environment with ambient temperatures up to 85°C, and how does its MELF package influence thermal management?
The DL4729A’s 1W rating is specified at 25°C; power must be derated above this temperature. While the datasheet lacks an explicit derating curve, typical Zener diodes in DO-213AB packages derate at ~6–8 mW/°C above 25°C. At 85°C ambient, maximum allowable power drops to approximately 0.5–0.6W. The MELF package’s cylindrical glass body provides superior thermal conductivity and mechanical stability compared to flat-pak SMD diodes, enabling better heat dissipation to the PCB—but ensure adequate copper area (≥50 mm²) under the cathode pad and avoid adjacent heat sources. Always validate thermal performance with IR imaging or thermocouple testing under worst-case load.
Can the DL4729A handle repetitive ESD or inductive kickback transients in a relay driver circuit, and what protection network should I add to prevent long-term degradation?
The DL4729A’s 1W continuous rating and robust MELF construction give it better transient energy absorption than smaller Zeners, but it is not designed for repetitive high-energy spikes like those from relay coils. Without additional suppression, repeated inductive kickback can cause cumulative damage due to localized heating at the junction. To protect the DL4729A, use it in conjunction with a TVS diode (e.g., SMAJ5.0A) for fast clamping and a series resistor (10–100Ω) to limit peak current. This hybrid approach diverts most transient energy away from the Zener, preserving its lifespan while maintaining stable 3.6V regulation during normal operation.
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DL4729A CAD Models
Rectron USA DL4729A PCB symbols & footprints
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