TCR3UF33A - 300mA, 3.3V Fixed LDO Regulator | Toshiba | Portable
Référence : TCR3UF33A ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.45 | $0,45 |
| 10 | $0.38 | $3,80 |
| 100 | $0.3 | $30,00 |
| 500 | $0.25 | $125,00 |
| 1 000 | $0.2121 | $212,10 |
| 3 000 | $0.18 | $540,00 |
TCR3UF33A Présentation
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage approaches the output rail. In the broader taxonomy, an LDO is a linear regulator, which itself belongs to the voltage regulator family inside power management ICs used wherever a clean DC rail must be derived from a higher-voltage source. Unlike switching regulators, LDOs do not introduce switching ripple, making them preferable for low-noise analog, RF, and microcontroller supply domains.
Key electrical highlights include 1 uF ceramic input/output capacitor compatibility, fixed output accuracy across the 0.8 V to 5.0 V family range, and CMOS-process construction that drives the 380 nA quiescent floor down to levels rarely matched at this price. The auto-discharge feature actively pulls the output to ground when the regulator is disabled, eliminating residual charge and making predictable micro-rail sequencing easier in portable devices.
Architecturally, the part combines a precision bandgap reference, a low-resistance CMOS pass element, and feedback control that holds VOUT within tolerance across line, load, and temperature. The thermal shutdown block protects the die above the rated junction limit, while overcurrent protection folds the pass element back under sustained short-circuit events.
Typical applications include cellular phone sub-rails, IoT and wearable sensors, camera and image sensor modules, and any 3.3 V MCU power tree that demands low quiescent current and a small PCB footprint. Designers choosing this part usually value low IQ for battery life, ceramic-cap compatibility for BOM simplification, and the SMV/SOT-25 footprint for high-density board assembly.
When designing with TCR3UF33A, observe the input/output capacitor ESR window for stability, derate VIN-VOUT at high load to avoid tripping thermal shutdown, and use the EN pin for sequenced start-up to prevent back-feeding a partially powered rail.
This page synthesizes distributor pricing from LCSC and Mouser, drop-in alternative cross-references from Toshiba same-family variants, and practical design notes not found in the manufacturer's datasheet alone.
Alternatives de remplacement direct pour TCR3UF33A — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
TCR3UF33A,LM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TCR3UF28A
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TCR3UF30A
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TCR3UF36A
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TCR3UF50A
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TCR3UF33A Valeurs maximales et caractéristiques électriques
| Product Type | CMOS LDO Linear Voltage Regulator |
| Type de sortie | Fixed |
| Tension de sortie | 3.3 V |
| Plage de tension d'entrée | Up to 5.5 V |
| Courant de sortie maximal | 300 mA |
| Tension de déchet | 206 mV at 300 mA |
| Courant de repos | 380 nA (typ) |
| Bruit de sortie | 41 uVrms |
| PSRR | 70 dB at 1 kHz |
| On/Off Control | Active-high EN input |
| Input Capacitor | 1 uF ceramic |
| Output Capacitor | 1 uF ceramic |
| Protection Features | Overcurrent, Thermal Shutdown, Auto-Discharge |
| Température de fonctionnement | -40 C to +85 C (Ta) |
| Boîtier | SMV (SOT-25), 2.9 mm x 2.8 mm, 1.1 mm height |
| Type de montage | Surface Mount |
| Process Technology | CMOS |
| Statut RoHS | Compliant |
Configuration des broches de TCR3UF33A
| Broche 1 | VIN — Input supply voltage |
| Broche 2 | GND — Ground |
| Broche 3 | EN/ON — On/Off control input (active high) |
| Broche 4 | NC — Not connected (per datasheet) |
| Broche 5 | VOUT — Regulated output voltage (3.3 V) |
Applications typiques
TCR3UF33A convient pour 6 applications: Cellular Phone Sub-Rails, IoT and Wearable Sensor Modules, Camera and Image Sensor Power, Battery-Powered 3.3 V MCU Rails, Low-Noise Analog Front-End Supply, Replacement for Legacy 3.3 V LDO Footprints.
Cellular Phone Sub-Rails
The TCR3UF33A's 380 nA quiescent current and 3.3 V fixed output make it a strong match for cellular phone sub-rail supplies that must stay alive during standby to power radios or sensors without draining the handset battery. The 206 mV dropout at 300 mA holds regulation when the cell droops, and the SMV (SOT-25) footprint keeps the part out of the way on crowded PMU-side layouts.
Recommandé
IoT and Wearable Sensor Modules
In IoT and wearable sensor modules, the TCR3UF33A's sub-microamp quiescent bias preserves coin-cell life while delivering up to 300 mA to BLE SoCs or sensor clusters that pulse current at high duty. The 70 dB PSRR at 1 kHz and 41 uVrms output noise hold the supply clean for accelerometer and bio-sensor analog front-ends that share the same battery domain.
Recommandé
Camera and Image Sensor Power
Camera and image sensor modules benefit from the TCR3UF33A's auto-discharge MOSFET that actively pulls VOUT to ground when the regulator is disabled, preventing residual charge on the image sensor's analog rail from corrupting the next frame-capture cycle. The 1 uF ceramic input/output capacitor compatibility keeps the BOM small on space-constrained sensor flex PCBs.
Recommandé
Battery-Powered 3.3 V MCU Rails
The TCR3UF33A is a textbook pick for a 3.3 V MCU rail sourced from a Li-ion or 2x AA battery stack, where 300 mA is sufficient for short radio TX bursts and 206 mV dropout keeps the rail regulated even at low battery cut-off. The SOT-25 footprint and 1 uF ceramic caps minimize PCB area compared to larger DPAK or SOT-223 alternatives.
Recommandé
Low-Noise Analog Front-End Supply
Precision analog front-ends for instrumentation and biometric applications draw clean 3.3 V from the TCR3UF33A, leveraging its 70 dB PSRR at 1 kHz and 41 uVrms output noise to keep supply-induced noise out of op-amp and ADC measurements. The auto-discharge function prevents charge injection into adjacent analog rails when the AFE is power-cycled between measurements.
Recommandé
Replacement for Legacy 3.3 V LDO Footprints
Designers refactoring an older 3.3 V LDO footprint in a SOT-25 / SMV land pattern can drop in the TCR3UF33A as a low-IQ modern replacement, taking advantage of its CMOS process and 380 nA IQ to lower standby power. Toshiba's TCR3UF33A,LM(CT) MouseReel format matches the legacy distributor footprint without requiring PCB rework.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TCR3UF33A — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Pick the TCR3UF28A, TCR3UF30A, TCR3UF36A, or TCR3UF50A from the same Toshiba family if your design demands a different fixed voltage but you want to reuse the SMV land pattern and ancillary circuitry. None of the alternatives listed beat the TCR3UF33A on 3.3 V-specific fit; the family exists to give you a BOM option, not a performance upgrade.
For higher current (>300 mA) or tighter dropout at full load, look at Toshiba's TCR3DF series or move to a switching regulator. For AEC-Q100 automotive projects, verify AEC qualification before committing - the standard TCR3UF33A is qualified for industrial/consumer use only per the Toshiba product family positioning.
Comparaison avec les alternatives
| Paramètre | Ce produit | TCR3UF33A,LM(CT) | TCR3UF28A | TCR3UF30A | TCR3UF36A | TCR3UF50A |
|---|---|---|---|---|---|---|
| Brand | Toshiba | Toshiba | Toshiba | Toshiba | Toshiba | Toshiba |
| Package | SMV (SOT-25) | SMV (SOT-25) - same | SMV (SOT-25) - same | SMV (SOT-25) - same | SMV (SOT-25) - same | SMV (SOT-25) - same |
| Output Voltage | 3.3 V | 3.3 V | 2.8 V | 3.0 V | 3.6 V | 5.0 V |
| Maximum Output Current | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA |
| Quiescent Current | 380 nA | 380 nA | 380 nA (typ, family) | 380 nA (typ, family) | 380 nA (typ, family) | 380 nA (typ, family) |
| Output Noise | 41 uVrms | 41 uVrms | 41 uVrms (typ, family) | 41 uVrms (typ, family) | 41 uVrms (typ, family) | 41 uVrms (typ, family) |
| PSRR | 70 dB at 1 kHz | 70 dB at 1 kHz | 70 dB at 1 kHz (typ, family) | 70 dB at 1 kHz (typ, family) | 70 dB at 1 kHz (typ, family) | 70 dB at 1 kHz (typ, family) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C (family) | -40 C to +85 C (family) | -40 C to +85 C (family) | -40 C to +85 C (family) |
Principaux différenciateurs
- Ultra-low 380 nA quiescent current for battery-standby designs (vs TCR3UF33A,LM(CT))
- Fixed 3.3 V family member with auto-discharge for sequenced power-down (vs TCR3UF28A)
- Same Toshiba family pinout as 2.8 V to 5.0 V variants for design reuse (vs TCR3UF36A)
Notes de conception
At VIN = 4.2 V (Li-ion), VOUT = 3.3 V, and IOUT = 300 mA, the TCR3UF33A dissipates approximately (4.2 - 3.3) * 0.3 = 0.27 W. With the SMV (SOT-25) theta_JA on a small two-layer PCB (~250 C/W est.), the junction rises roughly 67 C above ambient - acceptable at room temperature but watch the corner case where VIN = 5.0 V USB minus diode drop and ambient approaches +85 C. Pads under the SMV thermal flag and a copper pour under the exposed area dramatically reduce theta_JA.
Place the 1 uF ceramic input and output capacitors within 1-2 mm of the VIN and VOUT pads to minimize parasitic inductance that would otherwise raise AC impedance and degrade PSRR at high frequency. Use X5R or X7R dielectric to hold capacitance over the -40 C to +85 C operating range; Y5V ceramics lose 60-80% of nominal capacitance in the cold corner and can cause oscillation or excessive ripple.
Do not leave the EN/ON pin floating if your design relies on auto-disable during shutdown - the pin has a weak internal pull, but external noise can falsely enable the regulator. Drive EN from a clean logic-level GPIO or a pull-up/down resistor to a known rail. Avoid pulling VOUT above VIN, since the auto-discharge MOSFET can sink current backwards into VOUT in some disable conditions.
Informations de conformité
RoHS and REACH compliant per Toshiba product page and JLCPCB listing. Not AEC-Q100 qualified - choose a different Toshiba LDO family for automotive applications. Halogen-free per the SMV package material declaration.
