Specifications
| Type | Description |
|---|---|
| Part Number | NCP1086 |
| Manufacturer | STMicroelectronics |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | TO-220-3 Case 221A; D2PAK-3 Case 418AB; SOT-223 Case 318E |
| Component Type | Power_IC |
| Output Current | 1.5 A; adjustable or 3.3 V fixed output regulator capability |
| Adjustable Output Voltage Range | 1.25 V to 5.5 V; adjustable output version using two external resistors |
| Fixed Output Voltage | 3.3 V; fixed output version |
| Output Accuracy | ±1%; over temperature |
| Typical Dropout Voltage | 1.05 V; IOUT=1.5 A |
| Maximum Dropout Voltage | 1.4 V; IOUT=1.5 A |
| Protection Features | Current limit; thermal shutdown; fault protection circuitry |
| Supply Voltage Maximum Rating | 7.0 V; VCC absolute maximum rating |
| Operating Temperature Range | -40 to +70 °C; maximum ratings table |
| Junction Temperature | 150 °C; maximum ratings table |
| Storage Temperature Range | -60 to +150 °C; maximum ratings table |
| Lead Temperature, Wave Solder | 260 °C peak; through-hole styles only; 10 s maximum |
| Lead Temperature, Reflow | 230 °C peak; SMD styles only; 60 s maximum above 183°C |
| ESD Damage Threshold | 2.0 kV; maximum ratings table |
| Reference Voltage | Min 1.241 V, Typ 1.254 V, Max 1.266 V; adjustable output; VIN-VOUT=1.5 V; VAdj=0 V; 10 mA<=IOUT<=1.5 A |
| Line Regulation | Typ 0.02%, Max 0.2%; adjustable output; 1.5 V<=VIN-VOUT<=5.75 V; IOUT=10 mA |
| Load Regulation | Typ 0.04%, Max 0.4%; adjustable output; VIN-VOUT=1.5 V; 10 mA<=IOUT<=1.5 A |
| Dropout Voltage | Typ 1.05 V, Max 1.4 V; adjustable output; IOUT=1.5 A |
| Current Limit | Min 1.6 A, Typ 3.1 A; adjustable output; VIN-VOUT=3.0 V; TJ>=25°C |
| Minimum Load Current | Typ 0.6 mA, Max 2.0 mA; adjustable output; VIN=7.0 V; VAdj=0 |
| Adjust Pin Current | Typ 50 µA, Max 100 µA; adjustable output; VIN-VOUT=3.0 V; IOUT=10 mA |
| Thermal Regulation | Typ 0.002%/W, Max 0.02%/W; adjustable output; 30 ms pulse; TA=25°C; guaranteed by design |
| Ripple Rejection | Typ 80 dB; adjustable output; f=120 Hz; IOUT=1.5 A; VIN-VOUT=3.0 V; VRIPPLE=1.0 VP-P; guaranteed by design |
| Thermal Shutdown | Min 150°C, Typ 180°C, Max 210°C; adjustable output; functionally tested in production |
| Thermal Shutdown Hysteresis | Typ 25°C; adjustable output |
| Output Voltage | Min 3.25 V, Typ 3.3 V, Max 3.35 V; fixed output; VIN-VOUT=1.5 V; 0<=IOUT<=1.5 A |
| Output Voltage Accuracy | -1.5% to +1.5%; fixed output voltage specification |
| Line Regulation | Typ 0.02%, Max 0.2%; fixed output; 2.0 V<=VIN-VOUT<=3.7 V; IOUT=10 mA |
| Load Regulation | Typ 0.04%, Max 0.4%; fixed output; VIN-VOUT=2.0 V; 10 mA<=IOUT<=1.5 A |
| Dropout Voltage | Typ 1.05 V, Max 1.4 V; fixed output; IOUT=1.5 A |
| Current Limit | Min 1.6 A, Typ 3.1 A; fixed output; VIN-VOUT=3.0 V |
| Quiescent Current | Typ 5.0 mA, Max 10 mA; fixed output; IOUT=10 mA |
| Thermal Regulation | Typ 0.002%/W, Max 0.02%/W; fixed output; 30 ms pulse; TA=25°C; guaranteed by design |
| Ripple Rejection | Typ 80 dB; fixed output; f=120 Hz; IOUT=1.5 A; VIN-VOUT=3.0 V; VRIPPLE=1.0 VP-P; guaranteed by design |
| Thermal Shutdown | Min 150°C, Typ 180°C, Max 210°C; fixed output; functionally tested in production |
| Thermal Shutdown Hysteresis | Typ 25°C; fixed output |
| Adjustable Pin 1 Function | Adj; D2PAK-3, TO-220-3, SOT-223 adjustable output package pin description |
| Pin 2 Function | VOUT regulated output voltage; case; D2PAK-3, TO-220-3, SOT-223 adjustable and fixed output package pin description |
| Pin 3 Function | VIN input voltage; D2PAK-3, TO-220-3, SOT-223 adjustable and fixed output package pin description |
| Fixed Output Pin 1 Function | GND; D2PAK-3, TO-220-3, SOT-223 3.3 V fixed output package pin description |
| Input Capacitor | 10 µF; electrical characteristics test condition; CIN=10 µF |
| Output Capacitor | 22 µF tantalum; electrical characteristics test condition; COUT=22 µF tantalum |
| Recommended Output Capacitor | 22 µF tantalum; stability considerations; works for most applications |
| Maximum VIN to VOUT Differential | 7.0 V; adjustable output regulator absolute maximum specification for VIN-VOUT differential |
| Output Voltage Formula | VOUT=VREF*(R1+R2)/R1 + IAdj*R2; adjustable output resistor divider calculation |
| Minimum Divider Load Current | At least 2.0 mA; R1 chosen so minimum load current requirement is met |
| Datasheet Status | request_only |
Product Overview
The NCP1086 is a STMicroelectronics Power_Management linear voltage regulator with adjustable and fixed-output configurations. The adjustable version provides a 1.25 V to 5.5 V output range using two external resistors, while the fixed-output version provides a 3.3 V regulated output with 3.25 V minimum, 3.3 V typical, and 3.35 V maximum output voltage under the stated test condition.
The device supports 1.5 A output current and specifies 1.05 V typical dropout voltage, with 1.4 V maximum dropout at 1.5 A. Protection functions include current limit and thermal shutdown, with thermal shutdown specified from 150°C minimum to 210°C maximum and 25°C typical hysteresis.
Package options include TO-220-3 Case 221A, D2PAK-3 Case 418AB, and SOT-223 Case 318E. Pin functions are Adj or GND on pin 1 depending on version, VOUT and case on pin 2, and VIN on pin 3. Assembly-related ratings include 260°C peak wave solder for through-hole styles and 230°C peak reflow for SMD styles.
Key Features
- 1.5 A output current capability
- Adjustable output range from 1.25 V to 5.5 V
- Fixed 3.3 V output version available
- ±1% output accuracy over temperature
- 1.05 V typical dropout at 1.5 A
- 1.4 V maximum dropout at 1.5 A
- Current limit and thermal shutdown protection
- 80 dB typical ripple rejection at 120 Hz
- TO-220-3, D2PAK-3, and SOT-223 packages
- 22 µF tantalum output capacitor recommended
Typical Applications
- Adjustable regulated power rails
- Fixed 3.3 V supplies
- 1.5 A linear regulation
- Low-dropout post regulation
- Thermally protected regulator outputs
- TO-220-3 through-hole assemblies
- D2PAK-3 surface-mount assemblies
- SOT-223 compact regulator layouts
Procurement Notes
When requesting a quote for NCP1086, 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 current does the NCP1086 support?
The NCP1086 supports 1.5 A output current for both the adjustable regulator capability and the 3.3 V fixed output regulator capability.
What output voltages are specified for the NCP1086?
The adjustable version supports an output voltage range from 1.25 V to 5.5 V using two external resistors. The fixed-output version provides 3.3 V, with a specified range of 3.25 V minimum to 3.35 V maximum under the stated test condition.
What dropout voltage is specified at full output current?
At IOUT=1.5 A, the NCP1086 dropout voltage is specified as 1.05 V typical and 1.4 V maximum for both adjustable and fixed output versions.
Which package options and pin functions are listed?
Package options are TO-220-3 Case 221A, D2PAK-3 Case 418AB, and SOT-223 Case 318E. Pin 2 is VOUT and case, pin 3 is VIN, and pin 1 is Adj for adjustable versions or GND for the fixed 3.3 V version.
What capacitors are used in the stated test and stability conditions?
The electrical characteristics use a 10 µF input capacitor and a 22 µF tantalum output capacitor. The datasheet facts also list a 22 µF tantalum capacitor as the recommended output capacitor for most applications.
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.