Specifications
| Type | Description |
|---|---|
| Part Number | LM350 |
| Manufacturer | STMicroelectronics |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | TO-220 3L (Single Gauge), JEDEC Variation AB |
| Regulator Topology | 3-terminal positive adjustable regulator; condition: Device description |
| Output Voltage Range | 1.2 V to 33 V; condition: Adjustable output range |
| Guaranteed Output Current | 3 A; condition: Feature specification |
| Output Current Capability | In excess of 3.0 A; condition: Over output voltage range of 1.2 V to 33 V |
| Operating Temperature Range | 0 to +125 °C; condition: Ordering information / absolute maximum ratings |
| Input-Output Voltage Differential | 35 V max; condition: Absolute maximum rating, TA=25°C |
| Lead Temperature | 300 °C max; condition: Soldering, 10 sec |
| Storage Temperature Range | -65 to +150 °C; condition: Absolute maximum rating, TA=25°C |
| Power Dissipation | Internally limited; condition: Thermal characteristics, TA=25°C |
| Line Regulation | 0.015 %/V typ, 0.030 %/V max; condition: TA=+25°C, 3 V <= VI-VO <= 35 V |
| Load Regulation | 5 mV typ, 25 mV max; condition: TA=+25°C, 3 V <= VI-VO <= 35 V, VO <= 5 V |
| Load Regulation | 0.1 % typ, 0.5 % max; condition: TA=+25°C, 3 V <= VI-VO <= 35 V, VO >= 5 V |
| Adjustment Pin Current | 50 µA typ, 100 µA max; condition: VI-VO=5 V, IO=1.5 A, 0°C <= TJ <= +125°C, PD <= PDMAX |
| Adjustment Pin Current Change | 0.2 µA typ, 5.0 µA max; condition: 3 V <= VI-VO <= 35 V, 10 mA <= IO <= 3 A, PD <= PDMAX |
| Thermal Regulation | 0.002 %/W typ; condition: Pulse=20 ms, TA=+25°C |
| Reference Voltage | 1.20 V min, 1.25 V typ, 1.30 V max; condition: 3 V <= VI-VO <= 35 V, 10 mA <= IO <= 3 A, PD <= 30 W |
| Line Regulation | 0.02 typ, 0.07 max; condition: 3.0 V <= VI-VO <= 35 V |
| Load Regulation | 20 mV typ, 70 mV max; condition: 10 mA <= IO <= 3.0 A, VO <= 5.0 V |
| Load Regulation | 0.3 % typ, 1.5 % max; condition: 10 mA <= IO <= 3.0 A, VO >= 5.0 V |
| Temperature Stability | 1.0 %; condition: TJ=0°C to +125°C |
| Maximum Output Current | 3.0 A min, 4.5 A typ; condition: VI-VO <= 10 V, PD <= PDMAX |
| Maximum Output Current | 0.25 A min, 1.0 A typ; condition: VI-VO=30 V, PD <= PMAX, TA=+25°C |
| Minimum Load Current | 3.5 mA typ, 10 mA max; condition: VI-VO=35 V |
| RMS Noise | 0.003 % of VOUT typ; condition: 10 Hz <= f <= 10 kHz, TA=+25°C |
| Ripple Rejection | 65 dB typ; condition: VO=10 V, f=120 Hz, CADJ=0 |
| Ripple Rejection | 66 dB min, 80 dB typ; condition: VO=10 V, f=120 Hz, CADJ=10 µF |
| Long-Term Stability | 0.3 % typ, 1 % max per 1000 hours; condition: TJ=+125°C |
| Input Capacitor | 0.1 µF; condition: Typical application; required if regulator is appreciable distance from power supply filter |
| Output Capacitor | 1 µF shown; 1 µF to 100 µF commonly used; condition: Typical application; aluminum or tantalum electrolytic for improved output impedance and transient rejection |
| Program Resistor R1 | 120 ohm; condition: Typical application circuit |
| Output Voltage Formula | VO = 1.25 V(1 + R2/R1) + IADJ R2; condition: Typical application operation |
| Datasheet Status | request_only |
Product Overview
The STMicroelectronics LM350 is an adjustable positive voltage regulator for Power_Management designs requiring a 3-terminal positive adjustable regulator. Its output is adjustable from 1.2 V to 33 V, and the datasheet specifies a guaranteed 3 A output current with capability in excess of 3.0 A over the full adjustable output voltage range.
The regulator is supplied in a TO-220 3L (Single Gauge), JEDEC Variation AB package. Operating temperature is specified from 0 to +125 °C, storage temperature from -65 to +150 °C, and lead temperature is rated at 300 °C maximum for 10 seconds during soldering. Power dissipation is internally limited, while the input-output voltage differential absolute maximum is 35 V.
Electrical parameters include a 1.20 V to 1.30 V reference voltage range, 50 µA typical adjustment pin current, 0.003% of VOUT typical RMS noise, and ripple rejection of 65 dB typical without CADJ or 80 dB typical with 10 µF CADJ. The typical application uses a 120 ohm program resistor and the formula VO = 1.25 V(1 + R2/R1) + IADJ R2.
Key Features
- 3-terminal positive adjustable regulator topology
- 1.2 V to 33 V adjustable output range
- 3 A guaranteed output current rating
- Output current capability exceeds 3.0 A over range
- 35 V maximum input-output voltage differential
- Internally limited power dissipation
- 1.25 V typical reference voltage
- 50 µA typical adjustment pin current
- 0.003% of VOUT typical RMS noise
- 80 dB typical ripple rejection with 10 µF CADJ
- 0 to +125 °C operating temperature range
- Typical circuit uses 120 ohm program resistor
Typical Applications
- Adjustable positive power supplies
- 3 A regulated output rails
- 1.2 V to 33 V supply outputs
- TO-220 linear regulator designs
- Ripple-rejected regulator outputs
- Bench supply regulator stages
- Systems needing adjustable reference-derived output
Procurement Notes
When requesting a quote for LM350, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What output voltage range does the LM350 support?
The LM350 is specified as an adjustable positive voltage regulator with an output voltage range from 1.2 V to 33 V. The datasheet gives the output formula as VO = 1.25 V(1 + R2/R1) + IADJ R2.
How much output current is specified for the LM350?
The datasheet lists 3 A as the guaranteed output current. It also states output current capability in excess of 3.0 A over the 1.2 V to 33 V output voltage range.
What package is used for this STMicroelectronics regulator?
The LM350 is listed with a TO-220 3L (Single Gauge), JEDEC Variation AB package. Lead temperature is specified as 300 °C maximum for soldering over 10 seconds.
What capacitors are shown in the typical LM350 application?
The typical application shows a 0.1 µF input capacitor and a 1 µF output capacitor. The datasheet notes that 1 µF to 100 µF output capacitance is commonly used for improved output impedance and transient rejection.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 26, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.