Specifications
| Type | Description |
|---|---|
| Part Number | MC33269 |
| Manufacturer | STMicroelectronics |
| Product Type | LDO Regulator |
| Category | Power Management |
| Component Type | Power_IC |
| Package / Case | SO-8 Case 751; DPAK Case 369C; SOT-223 Case 318E; TO-220AB Case 221AB |
| Regulator Polarity | Positive voltage regulator |
| Output Configuration | Fixed and adjustable versions |
| Nominal Fixed Output Voltages | 3.3 V, 3.5 V, 5.0 V, 12 V |
| Output Current Capability | >800 mA |
| Dropout Voltage Feature | 1.0 V |
| Input Voltage Maximum Rating | 20 V |
| Power Dissipation | Internally limited, Case 369C DPAK, TA=25°C |
| Thermal Resistance Junction-to-Ambient, DPAK | 92 °C/W, Case 369C DPAK |
| Thermal Resistance Junction-to-Case, DPAK | 6.0 °C/W, Case 369C DPAK |
| Thermal Resistance Junction-to-Ambient, SO-8 | 160 °C/W, Case 751 SO-8 |
| Thermal Resistance Junction-to-Case, SO-8 | 25 °C/W, Case 751 SO-8 |
| Thermal Resistance Junction-to-Ambient, TO-220 | 65 °C/W, Case 221A TO-220 |
| Thermal Resistance Junction-to-Case, TO-220 | 5.0 °C/W, Case 221A TO-220 |
| Thermal Resistance Junction-to-Ambient, SOT-223 | 156 °C/W, Case 318E SOT-223 |
| Thermal Resistance Junction-to-Case, SOT-223 | 15 °C/W, Case 318E SOT-223 |
| Operating Junction Temperature Range | -40 to +150 °C |
| Operating Ambient Temperature Range | -40 to +125 °C, MC33269 and NCV33269 |
| Storage Temperature Range | -55 to +150 °C |
| ESD Sensitivity, Human Body Model | 4000 V |
| ESD Sensitivity, Machine Model | 400 V |
| Output Voltage Accuracy, 3.3 Suffix | 3.27 V min, 3.3 V typ, 3.33 V max; Iout=10 mA, VCC=5.3 V, TA=25°C |
| Output Voltage Accuracy, 3.5 Suffix | 3.465 V min, 3.5 V typ, 3.535 V max; Iout=10 mA, VCC=5.5 V, TA=25°C |
| Output Voltage Accuracy, 5.0 Suffix | 4.95 V min, 5.0 V typ, 5.05 V max; Iout=10 mA, VCC=7.0 V, TA=25°C |
| Output Voltage Accuracy, 12 Suffix | 11.88 V min, 12 V typ, 12.12 V max; Iout=10 mA, VCC=14 V, TA=25°C |
| Reference Voltage, Adjustable Version | 1.235 V min, 1.25 V typ, 1.265 V max; Iout=10 mA, Vin-Vout=2.0 V, TA=25°C |
| Line Regulation | 0.3% max; Iout=10 mA, Vin=Vout+1.5 V to 20 V, TA=25°C |
| Load Regulation | 0.5% max; Vin=Vout+3.0 V, Iout=10 mA to 800 mA, TA=25°C |
| Dropout Voltage at 500 mA | 1.0 V typ, 1.25 V max |
| Dropout Voltage at 800 mA | 1.1 V typ, 1.35 V max |
| Ripple Rejection | 55 dB min; 10 Vpp, 120 Hz sinewave, Iout=500 mA |
| Current Limit | 800 mA min; Vin-Vout=10 V |
| Quiescent Current, Low Fixed Outputs | 5.5 mA typ, 8.0 mA max; fixed output, 1.5 V ≤ Vout ≤ 3.5 V |
| Quiescent Current, 5 V to 12 V Fixed Outputs | 20 mA max; fixed output, 5 V ≤ Vout ≤ 12 V |
| Minimum Required Load Current, Fixed Output | 0 mA max |
| Minimum Required Load Current, Adjustable Output | 8.0 mA min |
| Adjustment Pin Current | 120 µA max, adjustable version |
| Output Capacitor Requirement | At least 10 µF, external output capacitor required for stability |
| Output Capacitor ESR Requirement | >0.2 Ω and <10 Ω across anticipated operating temperature range |
| Recommended Input Bypass Capacitor | 0.33 µF or larger for transient response or long input leads |
| Thermal Shutdown Activation | 170 °C typ, internal thermal limiting output disable threshold |
| Datasheet Status | request_only |
Product Overview
The MC33269 is an STMicroelectronics low dropout voltage regulator in the Power_Management category. It is described as a positive voltage regulator series with both fixed and adjustable output configurations. Fixed nominal output voltage options are 3.3 V, 3.5 V, 5.0 V, and 12 V, while the adjustable version uses a 1.25 V typical reference voltage under the stated test condition.
Electrical limits include a 20 V maximum input voltage rating, output current capability above 800 mA, 0.3% maximum line regulation, and 0.5% maximum load regulation. Dropout voltage is specified as 1.0 V typical at 500 mA and 1.1 V typical at 800 mA, with ripple rejection of 55 dB minimum at 120 Hz and 500 mA.
Package cases listed for the device include SO-8 Case 751, DPAK Case 369C, SOT-223 Case 318E, and TO-220AB Case 221AB. Thermal data varies by package, including junction-to-ambient values from 65 °C/W for TO-220 to 160 °C/W for SO-8. External stability requires at least a 10 µF output capacitor with ESR greater than 0.2 Ω and less than 10 Ω across the operating temperature range.
Key Features
- Positive low dropout voltage regulator series
- Fixed and adjustable output voltage versions
- Nominal fixed outputs: 3.3 V, 3.5 V, 5.0 V, 12 V
- Output current capability greater than 800 mA
- Maximum input voltage rating of 20 V
- 0.3% maximum line regulation at TA=25°C
- 0.5% maximum load regulation at TA=25°C
- 55 dB minimum ripple rejection at 120 Hz
- Internally limited power dissipation in DPAK case
- Thermal shutdown activates at 170°C typical
- Requires at least 10 µF output capacitor
- Output capacitor ESR must be 0.2 Ω to 10 Ω
Typical Applications
- Positive regulated supply rails
- Fixed 3.3 V regulator outputs
- Fixed 5.0 V regulator outputs
- Fixed 12 V regulator outputs
- Adjustable voltage regulator circuits
- 800 mA-class regulated outputs
- Low dropout power regulation
- Long input lead bypass designs
- Thermally limited regulator assemblies
Procurement Notes
When requesting a quote for MC33269, 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 type of regulator is the MC33269?
The MC33269 is a low dropout positive voltage regulator from STMicroelectronics. The series includes both fixed and adjustable versions, with fixed nominal outputs of 3.3 V, 3.5 V, 5.0 V, and 12 V.
What output current can the MC33269 support?
The extracted datasheet facts specify output current capability greater than 800 mA. Current limit is listed as 800 mA minimum with Vin-Vout equal to 10 V.
What capacitor is required for MC33269 stability?
The MC33269 requires an external output capacitor of at least 10 µF for stability. The output capacitor ESR must be greater than 0.2 Ω and less than 10 Ω across the anticipated operating temperature range.
Which package cases are listed for the MC33269?
The listed package cases are SO-8 Case 751, DPAK Case 369C, SOT-223 Case 318E, and TO-220AB Case 221AB. Thermal resistance values are specified separately for DPAK, SO-8, TO-220, and SOT-223 cases.
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.