1N4742A 12V Zener Diodes and Multi-Value Kits
At a glance: 1N4742A denotes a nominal 12 V Zener-voltage grade in the 1N47xx diode family. Select a variant explicitly labeled 1N4742A 12V when ordering that grade. The products below also include other voltages and multi-value kits; a shared listing title is not a specification for every option. A Zener diode's reverse voltage is defined at a specified test current and tolerance, not as a guaranteed 12 V output over arbitrary current and temperature.
What is in this collection?
- Explicit 12 V selections: multiple product menus list “1N4742A 12V,” including single-value options within larger 1N47xx selectors. A dedicated listing is titled “50pcs 1N4742A 1N4742 ... 12V”; verify its delivered code, particularly where the A suffix is omitted.
- Nearby grades are not substitutions by name: the menus also list 1N4741A 11V, 1N4743A 13V, 1N4733A 5V1 and other grades. Their stated nominal voltages differ from 1N4742A. Some variant labels omit the A suffix entirely; use the exact selected code and an applicable manufacturer's datasheet for BOM approval.
- Assortments are not single-value packs: listings include a seven-value kit with a “7Values X 10pcs Mix” option alongside a separate “100PCS 1N4742A 12V” choice. Two 14-value listings describe 140 pieces as 14 values x 10 pieces, including 12 V among the stated grades. Other kits list 30 values. Check each kit's included-value list before assuming its 12 V share; do not treat the kit total as a 1N4742A count.
- Imported specification conflicts: titles often say 1 W and DO-41, yet some product fields say surface mount, DO-35, rectifier or Schottky. One selector pairs “1N4748” with “28V,” while other entries pair the related 1N4748A grade with 22 V. These inconsistencies are not evidence of a new rating or interchangeable part. Confirm the selected component and package before procurement.
How to specify and qualify a part
- Electrical identity: record the full part number, nominal Zener voltage, tolerance, Zener test current, dynamic impedance and leakage conditions from the actual manufacturer's datasheet. The collection listing does not establish one common tolerance or test current across suppliers.
- Operating window: evaluate minimum and maximum reverse current across source, load and temperature extremes, then calculate worst-case power dissipation and apply the part's thermal derating. Do not use “1 W” in an imported heading as a universal continuous-power guarantee.
- Mechanical fit and polarity: verify axial or surface-mount package, body dimensions, lead pitch or land pattern, and cathode marking against the chosen part. A DO-41 headline and a contradictory package field cannot both define a PCB footprint.
- Purchase line: state whether the requirement is a single 12 V grade or a mixed assortment, exact variant text and required count of 1N4742A pieces. If the order needs a precision supply rail or surge-rated protection, qualify the appropriate regulator or TVS separately; nominal voltage alone does not establish those functions.
Frequently asked questions
Is every item here a 12 V 1N4742A?
No. This collection contains selectors with other voltages and assorted kits. The relevant choice must explicitly identify the 12 V grade; the product title alone is insufficient.
Does a 140-piece, 14-value kit contain 140 pieces of 1N4742A?
No. The stated composition is 14 values x 10 pieces, not 140 of one value. Verify that the particular kit includes 12 V and confirm its per-value count.
Can an 11 V 1N4741A or 13 V 1N4743A replace it?
Not without checking circuit limits and the full datasheets: their listed nominal breakdown voltages are different.
Does a “12V 1W DO-41” title establish regulated output, package and continuous rating?
No. Reverse voltage depends on specified current, tolerance and temperature; package and thermal limits must be confirmed for the exact selected device, especially where imported fields conflict.
