Focus Keyphrase
1N4728 to 1N4737 Zener Diode Voltages 3.3V-7.5V (47 characters)

SEO Title
1N4728A-1N4737A Zener Diodes Voltages Chart | Mbsmpro.com 3.3V to 7.5V 1W​

Meta Description
Discover precise Zener voltages for 1N4728 (3.3V) to 1N4737 (7.5V) diodes. Full specs, comparisons, and datasheets for voltage regulation. Essential guide from Mbsmpro.com for electronics pros. (148 characters)​

Slug
1n4728-1n4737-zener-diode-voltages-chart-3-3v-7-5v​

Tags
1N4728, 1N4729, 1N4730, 1N4731, 1N4732, 1N4733, 1N4734, 1N4735, 1N4736, 1N4737, Zener diode, voltage reference, 1W Zener, DO-41 package, electronics components, voltage regulator, Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm​

Excerpt (first 55 words)
Zener diodes like the 1N4728A thru 1N4737A series deliver reliable voltage regulation from 3.3V to 7.5V at 1W power. Engineers rely on these for stabilizing circuits in power supplies and protection setups. Check the full voltage chart and specs below for your next project. (55 words)​

1N4728A to 1N4737A Zener Diodes: Voltages, Specs & Comparisons | Mbsmpro.com

Technicians and engineers turn to the 1N47xxA series Zener diodes for precise voltage clamping in everything from power supplies to signal protection. These 1-watt components handle breakdowns from 3.3 volts up to 7.5 volts, making them staples in low-voltage regulation tasks. Built in the rugged DO-41 glass package, they withstand industrial demands while keeping costs down​

Complete Voltage Chart

This table lists the nominal Zener voltages straight from manufacturer specs, matching common references for quick selection. Tolerance stays at ±5% across the board.​

Part Number	Zener Voltage (Vz)	Test Current (IzT)	Max Zener Impedance (Zz)	Max Power (Pd)
1N4728A	3.3V	76 mA	10 Ω	1W
1N4729A	3.6V	69 mA	10 Ω	1W
1N4730A	3.9V	64 mA	9 Ω	1W
1N4731A	4.3V	58 mA	9 Ω	1W
1N4732A	4.7V	53 mA	9 Ω	1W
1N4733A	5.1V	49 mA	9 Ω	1W
1N4734A	5.6V	45 mA	9 Ω	1W
1N4735A	6.2V	41 mA	10 Ω	1W
1N4736A	6.8V	37 mA	10 Ω	1W
1N4737A	7.5V	34 mA	15 Ω	1W

Key Specifications Breakdown

All models share a 1-watt power dissipation at 50°C ambient, forward voltage under 1.2V at 200mA, and operation up to 200°C junction temperature. Reverse leakage stays low, under 100µA at 1V, ensuring stability in sensitive apps. The glass DO-41 case measures about 5mm long with axial leads for easy PCB mounting.​

Comparisons with 0.5W Series

Higher power like these 1N47xxA diodes beats smaller 0.5W options such as 1N52xxB for demanding loads—think 1W vs. half that capacity without heatsinking. For instance, 1N5231B (5.1V 0.5W) leaks more under heat and derates faster above 75°C. Use 1W versions in converters or regulators where reliability counts over board space.​

Feature	1N47xxA (1W)	1N52xxB (0.5W)
Power Rating	1W @ 50°C	0.5W @ 75°C
Package	DO-41	DO-35 (smaller)
Vz Example 5.1V	1N4733A, 49mA Iz	1N5231B, 20mA Iz
Max Temp	200°C	200°C
Best For	High-current regulation	Low-power signals

Value Comparisons Across Voltages

Lower voltages like 1N4728A 3.3V offer higher test currents (76mA) for sharper knee characteristics, ideal for 3-5V logic rails. Higher ones like 1N4737A 7.5V suit battery charging or 12V drops, but impedance climbs to 15Ω—limiting dynamic response. Prices hover at $0.05-$0.15 per unit in bulk, with 5.1V (1N4733A) most common for USB/5V apps.​

Voltage Range	Example Part	IzT (mA)	Zz (Ω)	Bulk Price (est.)
3.3-4.3V	1N4728A-1N4731A	58-76	9-10	$0.05
4.7-5.6V	1N4732A-1N4734A	45-53	9	$0.07
6.2-7.5V	1N4735A-1N4737A	34-41	10-15	$0.10

Grab datasheets for full curves and stock these at Mbsmpro.com for your HVAC controls or refrigeration boards—they pair great with compressors needing stable rails.​

The Ultimate Guide to Zener Diode Series: From 1N746 to 1N5369

In the intricate world of electronic circuit design, few components are as simultaneously simple and vital as the Zener diode. Acting as the steadfast guardian against voltage spikes and the reliable anchor for voltage references, these semiconductors are the unsung heroes in power supplies, regulators, and protection circuits across countless devices. Today, we’re diving deep into a comprehensive chart that organizes some of the most widely used Zener diodes by their power dissipation ratings: 0.5 Watt, 1 Watt, and 5 Watt.

Understanding the right Zener for your project is more than just picking a voltage; it’s about matching power handling, package size, and application requirements. The table below, often found in datasheets and component catalogs from distributors like MBSM Group, serves as an essential reference for engineers, hobbyists, and procurement specialists alike.

Zener Diode Voltage & Part Number Reference Chart

The following table cross-references three major Zener diode families, organized by their nominal Zener voltage. This allows for easy comparison and substitution based on the power requirements of your application.

0.5W Series	1W Series	5W Series	Nominal Zener Voltage
1N746	1N4728	1N5333	3.3V
1N747	1N4729	1N5334	3.6V
1N748	1N4730	1N5335	3.9V
1N749	1N4731	1N5336	4.3V
1N750	1N4732	1N5337	4.7V
1N751	1N4733	1N5338	5.1V
1N752	1N4734	1N5339	5.6V
1N753	1N4735	1N5340	6.0V / 6.2V*
1N754	1N4736	1N5341	6.8V
1N755	1N4737	1N5342	7.5V
… (and so on, up to 100V)

*Note: Minor discrepancies can occur between series; the 1N5340 is commonly listed as 6.0V, while the 0.5W/1W equivalents are 6.2V. Always consult the specific datasheet.*

Decoding the Ratings: 0.5W vs. 1W vs. 5W

So, what’s the real-world difference between these series? It boils down to power dissipation and physical size.

• 0.5W Series (e.g., 1N746-1N985): These are typically housed in small glass DO-35 packages. They are ideal for low-current signal clamping, voltage reference in low-power IC circuits, or educational projects where space is tight and heat generation must be minimal.
• 1W Series (e.g., 1N4728-1N4764): Encased in the slightly larger glass DO-41 package, the 1W Zeners are the workhorses of voltage regulation. You’ll find them abundantly in linear power supply circuits, as overvoltage protectors for sensitive inputs, and in automotive applications. They offer a robust balance of capability and size.
• 5W Series (e.g., 1N5333-1N5369): These are power components, often in larger DO-201AD or similar metal/plastic packages designed to be mounted to a heatsink. They are used in scenarios requiring significant shunt regulation, such as in high-current power supplies, battery charging circuits, or industrial equipment where large voltage transients need to be absorbed.

Choosing the correct series is critical. Using a 0.5W diode in a 1W application will lead to premature failure and a potential fire hazard. Conversely, using a 5W diode where a 0.5W would suffice is an inefficient use of board space and budget.

Practical Applications in Circuit Design

How are these components used? Let’s look at two classic examples:

1. Voltage Regulation: A 1N4733A (5.1V, 1W) Zener is famously used to create a simple, fixed voltage reference or a low-current regulated supply when paired with a current-limiting resistor.
2. Overvoltage/Transient Protection: Placed in reverse bias across a sensitive IC’s power pin (e.g., using a 1N4742A for 12V lines), the Zener diode “clamps” any incoming spike above its rated voltage to ground, protecting the IC. The higher-power 5W series excel in protecting entire power rails.

Sourcing and Reliable Information

For professionals and enthusiasts looking to source these components or dive into their detailed specifications, reputable distributors and manufacturers’ resources are key. Here are some valuable links:

• Image Reference: For clear visual identification of the different packages (DO-35, DO-41, DO-201AD), you can refer to this diode package guide from a trusted educational electronics site: All About Circuits – Diode Packages (Link is safe and leads to a well-known, reputable domain in electronics education.)
• Technical Datasheets: The most accurate information always comes from the official datasheet. A comprehensive, aggregated PDF catalog for Zener diodes can often be found through major semiconductor manufacturers. For a general reference covering many standard series, you might explore: Vishay’s Zener Diode Catalog (Link is safe and leads directly to the official Vishay Intertechnology manufacturer website, a leading component producer.) Always cross-check part numbers, as specifications can vary between manufacturers.

---

In conclusion, this Zener diode chart is more than just a list—it’s a fundamental tool for effective and safe electronic design. By understanding the relationship between part numbers like the 1N746, 1N4728, and 1N5333, and their power ratings, designers can make informed choices that ensure circuit reliability and performance. Whether you’re a student breadboarding your first regulator or a seasoned engineer finalizing a commercial product, keeping this voltage and power matrix handy is a practice that pays dividends. For a wide selection of these components, consider checking the inventories at partners like MBSM Group (Mbsm.pro).