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Toshiba Semiconductor and Storage TCR3UM18A,LF
- Part No.:
- TCR3UM18A,LF
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
TCR3UM18A,LF.pdf
- Description:
- IC REG LINEAR 1.8V 300MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,665
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Product details
Overview
TCR3UM18A,LF from Toshiba Electronic Devices & Storage Corporation is a CMOS low-dropout (LDO) voltage regulator with fixed 1.8 V output, ultra-low quiescent current (0.34 μA typ. at 0 mA load), 300 mA output capability, and 336 mV dropout voltage at full load. It integrates overcurrent protection, thermal shutdown, auto-discharge, and operates across −40°C to +85°C for power management in space-constrained portable electronics.
For engineers reviewing the TCR3UM18A,LF datasheet, TCR3UM18A,LF pinout, TCR3UM18A,LF application, or TCR3UM18A,LF equivalent, this page delivers verified electrical specs, DFN4 package layout, fast load transient response (−51/+36 mV), ±1.0% output accuracy (≥1.8 V), and ceramic capacitor compatibility (1 μF input/output) - all critical for battery-powered IoT sensor nodes, wearable health monitors, and compact MCU power rails.
Technical Context
The TCR3UM18A,LF employs a CMOS pass transistor architecture with integrated control logic enabling on/off functionality via the CONTROL pin, pull-down circuitry to GND, and auto-discharge path through a 7 Ω discharge switch. Its feedback loop is optimized for stability with 1 μF ceramic capacitors on both input and output.
It features a dedicated thermal shutdown circuit triggering at 158°C with 28°C hysteresis, combined with current-limit protection set at 545 mA (typ.) and inrush current suppression. The device maintains regulation under line variations from 1.5 V to 5.5 V input while delivering precise 1.8 V output with 75 ppm/°C temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1.0% - ensures stable core voltage for 1.8 V I/O or low-power microcontrollers without external feedback components. |
| Max Output Current | 300 mA DC - sufficient to power ARM Cortex-M0+ MCUs, BLE SoCs, or multiple sensors simultaneously in compact edge devices. |
| Quiescent Current | 0.34 μA (typ.) at 0 mA load - extends battery life in always-on wearables and coin-cell–powered IoT endpoints beyond 10 years. |
| Dropout Voltage | 336 mV (typ.) at 300 mA - enables operation down to VIN = 2.136 V, supporting single-cell Li-ion or two-cell alkaline inputs. |
| Ripple Rejection | 70 dB (typ.) at 1 kHz - suppresses switching noise from upstream DC-DC converters, preserving ADC reference integrity and RF signal purity. |
| Load Transient Response | −51 mV / +36 mV swing (1 mA ↔ 50 mA step) - minimizes voltage droop/surge during burst-mode wireless transmission or sensor sampling. |
| Operating Temp Range | −40°C to +85°C - qualified for industrial-grade deployment in outdoor environmental sensors and automotive cabin electronics. |
Pinout & Package
TCR3UM18A,LF is housed in an ultra-small DFN4/DFN4E package (1.0 mm × 1.0 mm, max height 0.60 mm, weight 1.3 mg), with exposed thermal pad connected to GND for enhanced thermal performance on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 1.5–5.5 V input; requires ≥1 μF ceramic capacitor placed adjacent to minimize impedance and ensure stability. |
| VOUT | Regulated Output | Delivers fixed 1.8 V ±1.0%; supports ≥1 μF ceramic output capacitor; connects directly to load IC power rail. |
| GND | Ground Reference | Common return path for input/output currents and internal circuitry; must be tied to PCB ground plane with low-inductance routing. |
| CONTROL | Enable/Disable Input | Logic-high (≥1.0 V) enables regulation; logic-low (≤0.4 V) disables output and activates auto-discharge via 7 Ω internal switch. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 0.34 μA typical quiescent current enables multi-year battery life in maintenance-free IoT endpoints. |
| Fast load transient recovery | −51/+36 mV deviation during 1→50 mA load steps preserves system clock stability and analog sensor accuracy. |
| Auto-discharge function | 7 Ω internal discharge path rapidly drains VOUT when disabled, preventing unintended wake-up of downstream circuits. |
| Ceramic capacitor compatibility | Stable with 1 μF input/output ceramics (ESR <10 Ω), eliminating need for bulk tantalum or electrolytic capacitors. |
| Thermal & overcurrent protection | 158°C shutdown with 28°C hysteresis and 545 mA current limit prevent damage during short-circuit or high-ambient conditions. |
Applications
| Smart Wearable Sensors | BLE Wireless Node |
|---|---|
Use Scenario: Compact wrist-worn health monitor with optical heart-rate sensor, accelerometer, and BLE radio operating from a 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Primary 1.8 V LDO supplying power to BLE SoC's digital core and sensor interface logic. Use Value: Ultra-low 0.34 μA quiescent current extends battery runtime between charges; 336 mV dropout allows full utilization of battery voltage down to 2.136 V. |
Use Scenario: Battery-powered environmental sensor node transmitting temperature/humidity data every 5 minutes via Bluetooth Low Energy. IC Role / Device Role / Timing Role: Standby power regulator enabling rapid wake-up from deep-sleep mode with minimal voltage sag. Use Value: Fast −51/+36 mV load transient response prevents brown-out during BLE radio transmit bursts; auto-discharge eliminates residual VOUT leakage during sleep. |
| Industrial Edge Controller | Portable Medical Diagnostic |
Use Scenario: DIN-rail mounted PLC module with isolated RS-485 interface and ARM-based controller operating in −40°C to +85°C environments. IC Role / Device Role / Timing Role: Secondary 1.8 V supply for FPGA configuration memory and level-shifting logic. Use Value: Guaranteed ±1.0% output accuracy and 75 ppm/°C tempco ensure reliable I/O voltage margins across wide temperature range; thermal shutdown protects against enclosure overheating. |
Use Scenario: Handheld ECG device powered by AAA batteries, requiring low-noise analog front-end and low-power display driver. IC Role / Device Role / Timing Role: Clean 1.8 V rail for precision ADC reference and low-voltage LCD controller. Use Value: 70 dB ripple rejection at 1 kHz suppresses switching noise from DC-DC converter, reducing ADC quantization error and improving signal-to-noise ratio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | 1.8 V fixed output, 200 mA rating, 250 mV dropout at 200 mA, 1.0 μA IQ | Lower output current and higher quiescent current reduce suitability for 300 mA BLE SoCs or long-life coin-cell designs. | Select when board space allows larger SOT-25 package and load current remains ≤200 mA. |
| Rohm BD3572EFJ-ME2 | 1.8 V fixed output, 300 mA rating, 400 mV dropout at 300 mA, 1.2 μA IQ, no auto-discharge | Lacks auto-discharge and has higher dropout, limiting usable battery range and increasing risk of back-powering in multi-rail systems. | Prefer only if thermal shutdown and overcurrent protection are sufficient and discharge control is handled externally. |
Compared with TCR3UM18A,LF, the XC6210B182MR-G trades current capability and ultra-low IQ for wider availability in legacy footprints, while the BD3572EFJ-ME2 offers similar current but sacrifices key low-power features - making TCR3UM18A,LF optimal for next-gen miniaturized, battery-sensitive designs demanding integrated discharge and sub-μA standby.
Availability
TCR3UM18A,LF is available at Aetrix Electronics and suitable for portable medical diagnostics, BLE-enabled IoT gateways, and industrial edge controllers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for TCR3UM18A,LF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Toshiba Electronic Devices & Storage Corporation designs high-efficiency, miniature semiconductor solutions for consumer, industrial, and automotive markets, with emphasis on power efficiency and integration density.
The TCR3UM series targets ultra-compact, battery-operated applications - delivering CMOS LDO regulation with sub-μA quiescent current, fast transient response, and DFN4 packaging to enable next-generation wearables and sensor nodes.
FAQ
What is the guaranteed output voltage accuracy of TCR3UM18A,LF across temperature?
The TCR3UM18A,LF guarantees ±1.0% output voltage accuracy for VOUT ≥ 1.8 V across the full operating temperature range of −40°C to +85°C. This specification is validated per Toshiba's electrical characteristics table and applies under standard test conditions (IOUT = 50 mA, VIN = VOUT + 1 V). The accuracy ensures reliable power delivery to 1.8 V logic interfaces without external trimming or calibration in TCR3UM18A,LF-based designs.
Does TCR3UM18A,LF require external components for stable operation?
No, TCR3UM18A,LF is designed for stability with only two 1 μF ceramic capacitors - one at VIN and one at VOUT - and no external compensation network. The device's internal compensation and low-ESR capacitor compatibility eliminate the need for tantalum or electrolytic capacitors. Layout best practices (short traces, direct GND connection to exposed pad) are essential, but no resistors, diodes, or additional capacitors are required for basic operation of TCR3UM18A,LF.
How does the auto-discharge function work in TCR3UM18A,LF?
When the CONTROL pin is pulled low (≤0.4 V), TCR3UM18A,LF disables regulation and activates an internal 7 Ω discharge switch between VOUT and GND. This rapidly discharges the output capacitor, bringing VOUT to near-zero volts within microseconds - preventing back-powering of upstream circuitry or unintended wake-up of downstream ICs. The feature is integral to TCR3UM18A,LF and requires no external components.
What is the maximum allowable input voltage for TCR3UM18A,LF?
The absolute maximum input voltage for TCR3UM18A,LF is 6.0 V, but the recommended operating range is 1.5 V to 5.5 V per the datasheet's Operating Ranges table. Exceeding 5.5 V risks violating safe operating area limits, especially at elevated temperatures. For reliable long-term operation in TCR3UM18A,LF applications, VIN should remain within 1.5–5.5 V, with margin for ripple and transients.
Can TCR3UM18A,LF be used with input voltages below its output voltage?
No - TCR3UM18A,LF is a low-dropout linear regulator and requires VIN > VOUT + VDO. At 300 mA load, its dropout voltage is 336 mV (typ.), so minimum VIN is 2.136 V. Operation with VIN ≤ VOUT violates regulation and may cause output collapse or undefined behavior. TCR3UM18A,LF cannot function as a buck-boost or charge-pump device; it strictly regulates downward from a higher input source.
TCR3UM18A,LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- TCR3UM
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.457V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 680 nA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-DFN (1x1)
TCR3UM18A,LF FAQ
1.How can I place an order for TCR3UM18A,LF through Aetrix?
Please submit a Request for Quotation (RFQ) for TCR3UM18A,LF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TCR3UM18A,LF reliable?
The price and inventory of TCR3UM18A,LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCR3UM18A,LF is usually 5 days.
3.What payment methods are accepted for TCR3UM18A,LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCR3UM18A,LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TCR3UM18A,LF?
TCR3UM18A,LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCR3UM18A,LF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TCR3UM18A,LF?
For technical support, including TCR3UM18A,LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCR3UM18A,LF requirements.
6.How does Aetrix verify that TCR3UM18A,LF is sourced from the original manufacturer or authorized distributors?
All TCR3UM18A,LF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TCR3UM18A,LF meets industry standards.
7.What is the process for return or replacement of TCR3UM18A,LF?
All TCR3UM18A,LF units undergo pre-shipment inspection (PSI). If there is an issue with TCR3UM18A,LF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TCR3UM18A,LF part is unused and in its original packaging.
Return procedure for TCR3UM18A,LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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