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STMicroelectronics LM317BT — Power Management (PMIC / Gate Driver)

LM317BT STMicroelectronics Adjustable Linear Regulator 1.5A

MPNLM317BT
Obsolete

STMicroelectronics LM317BT, adjustable positive linear regulator, 1.5 A output, TO-220-3 through-hole package, industrial temperature range -40°C to 125°C.

$0.6900Ref. price · indicative, final on quote
PackagingTO-220-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM317BT specifications
ParameterValue
Output typeAdjustable
MountingThrough Hole
Voltage - input40V
Voltage - output37V
Voltage - output (Min (Fixed))1.2V
Output current1.5A
Current - quiescent10 mA
Operating temperature-40°C ~ 125°C
PSRR80dB ~ 65dB (120Hz)
PackageTube
CaseTO-220-3
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

Adjustable 1.5 A regulator — TO-220 package

The output voltage is set by two external resistors from 1.2 V up to 37 V, with a maximum input of 40 V. PSRR is specified at 80 dB to 65 dB at 120 Hz — the 80 dB floor at line frequency means the part can suppress mains ripple by a factor of 10,000, which is useful for powering sensitive analog loads from a rectified supply. Built-in protection includes over-current, over-temperature, and short-circuit — the regulator folds back current and shuts down thermally before the die exceeds safe junction temperature.

Industrial temperature grade and thermal derating

In the TO-220 package, the 1.5 A rating is achievable only with adequate heatsinking. Without a heatsink, the junction-to-ambient thermal resistance limits practical continuous current to roughly 0.5 A at 25°C ambient — plan the copper area or clip-on heatsink accordingly. Quiescent current is 10 mA typical — this is the ground pin current that flows regardless of load, so budget it in the supply rail for low-power designs.

Availability and pricing vary by date code and quantity — confirm current stock and lead time at quote time.

Frequently asked questions

How can I order the LM317BT or check stock?

The LM317BT is obsolete from STMicroelectronics. We source it through independent distribution against your BOM quantity.

Is the LM317BT a direct replacement for the LM317T?

The LM317BT shares the same base product number LM317 and the same TO-220 package, so it is functionally identical to the LM317T. The suffix 'BT' may indicate a specific date-code or factory-origin variant — confirm the marking code against your BOM's approved supplier list before committing.