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Texas Instruments LM309H/NOPB — Discrete Semiconductors
Texas Instruments

LM309H/NOPB Linear Regulator, 5.05V Fixed Output, 1A, TO-39

MPNLM309H/NOPB
End of Life

Texas Instruments LM309H/NOPB, positive fixed linear regulator, 5.05V output, 1A output current, TO-205AD / TO-39-3 metal can package, through-hole mount, 0°C to 125°C operating temperature.

$19.45Ref. price · indicative, final on quote
LM309H/NOPB datasheet
PackagingTO-205AD, TO-39-3 Metal Can
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

LM309H/NOPB Technical Specifications
ParameterValue
Output typeFixed
Mounting typeThrough Hole
Voltage - input25V
Voltage - output (Min (Fixed))5.05V
Current - output1A
Current - supply10 mA
Current - quiescent5.2 mA
Operating temperature0°C ~ 125°C
PackageBox
CaseTO-205AD, TO-39-3 Metal Can
Protection featuresOver Temperature
Number of regulators1
Output configurationPositive

Product details

1A output — thermal reality check

At 1A output, with a typical dropout of 2V or more, the TO-39 metal can will dissipate significant heat. The part includes over-temperature protection, but sustained full-load operation without a heatsink is unlikely at the upper end of the 0°C to 125°C junction range. Plan for a clip-on or bolt-on heatsink if your load draws close to 1A continuously. The quiescent current is 5.2 mA typical, max 10 mA — negligible in most designs, but worth budgeting in battery-powered gear.

Active production — no LTB risk

The LM309H/NOPB is listed as Active on the manufacturer's lifecycle status. ROHS3 compliant. For a classic linear regulator in a hermetic package, that is a solid sourcing position — no need to chase surplus or worry about an imminent EOL.

Frequently asked questions

What is the exact output voltage of LM309H/NOPB?

Design engineers need to confirm the fixed 5.05V output for circuit tolerance calculations.

Is LM309H/NOPB still active and not obsolete?

Sourcing buyers need lifecycle status to avoid supply chain risk and ensure long-term availability.

What is the pinout of LM309H/NOPB in TO-39?

Maintenance techs and engineers need correct pin assignments to replace or repair a board.

Where can I buy LM309H/NOPB with stock in the US?

Transactional buyers need immediate purchasing options from authorized distributors.

What is a direct replacement or equivalent for LM309H/NOPB?

Sourcing and broker roles need alternative parts if the original is hard to source or for second-source validation.

Can LM309H/NOPB deliver 1A output without heatsink?

Design engineers need to verify thermal management for the TO-39 package under maximum load.