LM337LZ/NOPB

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LM337LZ/NOPB

IC REG LIN NEG ADJ 100MA TO92-3

  • Fabricante
  • Mfr. Parte #LM337LZ/NOPB
  • Paquete TO-92 (LP)-3
  • Hoja de datos
  • En stock4369

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Especificaciones

Package Bulk
ProductStatus Active
OutputConfiguration Negative
OutputType Adjustable
NumberofRegulators 1
Voltage-Input(Max) -40V
Voltage-Output(Min/Fixed) -1.2V
Voltage-Output(Max) -37V
Current-Output 100mA
PSRR 60dB (120Hz)
ProtectionFeatures Over Temperature, Short Circuit
OperatingTemperature -25°C ~ 125°C
MountingType Through Hole
Package/Case TO-226-3, TO-92-3 (TO-226AA)

Descripción general

Description

The LM337LZ/NOPB is a low-power, three-terminal negative adjustable voltage regulator (TO-92 “LZ” package; NOPB = RoHS/no-lead). It provides a negative output from about -1.25 V down to roughly -37 V, with current up to ~1 A (depends on heat sinking).
Key points:
- Output set with external resistors: Vout ≈ -Vref (1 + R2/R1) − Iadj·R2, where Vref ≈ 1.25 V and Iadj ≈ 50 µA.
- Typical values: R1 ≈ 240 Ω; adjust R2 to obtain the desired negative voltage.
- Requires input-output headroom (dropout ~ 2 V) and stabilization capacitors on input and output for stability.
- Used for negative-power rails and to create symmetric supplies when paired with a positive regulator.
In short: a RoHS-compliant, adjustable negative regulator suitable for generating negative voltages from a negative input rail, with external resistors to set the desired output.

Features

LM337LZ/NOPB features (concise):
- Negative adjustable three-terminal regulator (LM337 family)
- Output range: -1.25 V to -37 V using external resistor network
- Maximum output current: up to about 1.5 A (depends on package/heatsinking)
- Dropout voltage around 3 V (typical)
- Internal reference of 1.25 V
- Requires a minimum load current (≈ 10 mA) for proper regulation
- Protections: current limit, thermal shutdown, and safe-operating-area protection
- Pin-compatible with standard LM337 schemes; suitable for symmetric supply designs
- Packaging options include RoHS-compliant LZ (Pb-free) versions; NOPB indicates no lead
Note: Always add appropriate input/output capacitors per datasheet recommendations for stability.

Package

TO-92 3-pin plastic package. The LZ code identifies the package type, and NOPB means the lead-free (Pb-free) version.

Pinout

- Pin count: 3 pins.
- Function: Negative adjustable voltage regulator. Pin 1 – Adjust; Pin 2 – Output (Vout); Pin 3 – Input (Vin).

Manufacturer

The LM337LZ/NOPB is manufactured by Texas Instruments (TI). TI is an American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits and embedded processing products. It is one of the world’s largest semiconductor companies, headquartered in Dallas, Texas (formed after acquiring National Semiconductor).

Application

LM337LZ/NOPB is a negative adjustable voltage regulator. Common applications:
- Providing a precise negative rail in dual (±) power supplies
- Regulating the negative supply for op-amps, instrumentation, and analog/audio circuits
- Post-regulator in battery-powered equipment needing a negative output
- Generating adjustable outputs from -1.2 V to about -37 V with external resistors
- Often used with LM317 to realize complete ± supplies

Equivalent

Equivalent parts are other negatives in the LM337 family. Cross references include:
- LM337LZ/NOPB (same device in RoHS lead-free)
- LM337 (in other packages)
- LM337L
- KA337 (Fairchild/ON Semiconductor lineage)
- NCP337 (ON Semiconductor)
All are -1.25 V reference, adjustable output from about -1.25 to -37 V, up to ~1.5 A, RoHS variants available.

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