Product Overview
Archer 1N4739 Series 9.1-Volt 1-Watt DO-41 Voltage Regulators
Condition
New old stock (NOS). Both axial-lead diodes remain sealed on the original card packaging under catalog number 276-562. Components are unused with straight leads and clear cathode band markings.
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Product Overview
This Archer catalog 276-562 package contains two 1N4739 9.1-volt, 1-watt Zener diodes distributed for Radio Shack by Tandy Corporation. Encapsulated in DO-41 hermetic glass axial packages, these diodes serve as stable voltage references and shunt regulators for vintage electronics repairs, bench power supplies, and analog circuit builds.
Key Features
- Nominal Zener voltage: 9.1 V
- Power dissipation: 1.0 W maximum
- Test current (Iz): 28 mA
- Package type: DO-41 hermetic glass axial lead
- Polarity: Marked cathode band
- Package quantity: 2 diodes on original retail card
Applications
- Shunt voltage regulation and rail clamping in audio preamps and analog circuits
- Voltage reference stabilization in discrete power supply builds
- Restoration and component replacement for vintage Radio Shack electronics kits
- Breadboard prototyping and educational bench experiments
Frequently Asked Questions
What are the voltage and power ratings for these diodes?
These 1N4739 diodes feature a nominal Zener breakdown voltage of 9.1 volts with a 1.0-watt maximum power dissipation rating and a standard test current of 28 mA.
How is the polarity identified on the diode body?
A printed band marks the cathode end of the glass axial body. In typical Zener shunt regulator circuits, the cathode connects toward the positive supply rail to operate in reverse breakdown mode.
Why buy this carded two-pack instead of an unsorted surplus lot?
You receive the exact two carded components shown, with verified specifications and straight leads, eliminating the risk of mismatched or damaged loose pulls. Orders ship for an $8 flat rate, qualify for free shipping over $28, and ship from our Idaho warehouse the same or next business day.
Nothing anchors a breadboard build quite like reaching for classic carded Archer silicon. It is an honest piece of workbench history ready to drop into circuit and hold nine point one volts steady.
