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Renesas UPD121W00AT1F-E1-AT
- Part No.:
- UPD121W00AT1F-E1-AT
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
UPD121W00AT1F-E1-AT.pdf
- Description:
- IC REG LINEAR FIXED STNDRD REG
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Inventory:2,500
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Product details
Overview
UPD121W00AT1F-E1-AT from Renesas Electronics is an adjustable-output CMOS linear regulator delivering up to 1.5 A with output voltage programmable from 1.8 V to 3.3 V via external resistors, featuring 1.0 V max dropout at full load, 150 µA typical quiescent current, and integrated thermal shutdown and over-current protection. It powers large-scale ASICs in digital consumer equipment requiring stable low-noise bias.
For engineers reviewing the UPD121W00AT1F-E1-AT datasheet, UPD121W00AT1F-E1-AT pinout, UPD121W00AT1F-E1-AT application, or UPD121W00AT1F-E1-AT equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for power supply design in space-constrained embedded systems.
Technical Context
The UPD121W00AT1F-E1-AT implements a CMOS-based low-dropout architecture with an internal reference voltage of 0.8 V ±2%, error amplifier, and constant-current buffer driving a P-channel pass transistor. Its adjustable output is set by R1/R2 divider connected to the ADJ pin, where VOUT = (1 + R1/R2) × 0.8 V.
It operates across −40°C to +85°C ambient temperature, supports input voltages from VO + 1 V to 5.5 V, and maintains stability with ≥10 µF laminated ceramic output capacitance. The device enters thermal shutdown if junction temperature exceeds 150°C and limits peak output current to 1.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A maximum - sufficient to power high-current ASIC cores without external boost circuitry |
| Output Voltage Range | 1.8 V to 3.3 V adjustable - enables single-regulator support for multiple core/logic voltage domains |
| Dropout Voltage | 0.6 V typical / 1.0 V max at 1.5 A - allows operation from low headroom supplies like 3.3 V or 5 V rails |
| Quiescent Current | 150 µA typical at zero load - minimizes standby power in always-on subsystems |
| Reference Voltage | 0.8 V ±2% - sets precision for external resistor-based output programming |
| Ripple Rejection | 70 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters |
| Thermal Shutdown Threshold | Junction temperature >150°C - protects against sustained overload or poor heatsinking |
Pinout & Package
UPD121W00AT1F-E1-AT uses a 5-pin TO-252 (MP-3ZK) surface-mount package with exposed thermal pad (Pin 6, common to GND). Pin 3 is cut and non-functional; Pin 4 is NC/ADJ and must be connected to the resistor divider for output adjustment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated input supply rail; must be ≥ VO + 1 V and ≤ 5.5 V |
| 2 | ON/OFF | Active-high enable; ≥1.5 V turns regulator on, ≤0.5 V places it in 1 µA standby mode |
| 3 | GND (cut) | Non-functional mechanical stub - not electrically connected |
| 4 | NC / ADJ | Adjust pin for external feedback; connects to R1–R2 divider node to set output voltage |
| 5 | OUTPUT | Regulated output; requires ≥10 µF ceramic capacitor for stability |
| 6 | GND (Fin) | Exposed thermal pad tied to GND; critical for thermal performance and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| CMOS Pass Transistor | Enables ultra-low quiescent current (150 µA) and eliminates base-drive losses found in bipolar LDOs |
| Adjustable Output Architecture | Supports precise 1.8–3.3 V outputs using two external resistors - no need for multiple fixed-voltage SKUs |
| Laminated Ceramic Cap Compatibility | Stable with ≥10 µF X5R/X7R ceramics - reduces board area vs. tantalum/electrolytic solutions |
| Integrated Protection | On-chip over-current limit (1.0 A short-circuit) and thermal shutdown prevent damage during fault conditions |
| Pb-Free Construction | RoHS-compliant finish with no lead in external electrodes - meets global environmental compliance requirements |
Applications
| Digital Consumer ASIC Power | Portable Media Processor Bias |
|---|---|
Use Scenario: Powering video decoding ASICs in DVD players and set-top boxes with variable core voltage demands. IC Role / Device Role / Timing Role: Primary low-noise post-regulator supplying clean 2.5 V or 3.3 V to logic blocks after a switching DC/DC stage. Use Value: 70 dB ripple rejection prevents switching noise from corrupting video signal integrity and timing margins. |
Use Scenario: Providing dynamically scaled I/O voltage to media processors in handheld devices operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Adjustable LDO enabling firmware-controlled voltage scaling between 1.8 V (low-power idle) and 3.3 V (high-speed interface). Use Value: 1.0 V max dropout allows regulation down to ~2.8 V input, extending usable battery range before system shutdown. |
| Industrial Camera Sensor Interface | Automotive Infotainment SoC Core Supply |
Use Scenario: Delivering stable 1.8 V to CMOS image sensor interfaces in machine vision systems with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise local regulator decoupling high-speed LVDS or MIPI data lanes from noisy main power rails. Use Value: 220 µVr.m.s. output noise ensures minimal jitter on pixel clock recovery circuits. |
Use Scenario: Supplying configurable core voltage to infotainment SoCs in automotive dashboards where thermal management is constrained. IC Role / Device Role / Timing Role: Thermally robust LDO mounted directly on PCB copper pour, leveraging Pin 6 GND fin for conduction cooling. Use Value: 12.5 °C/W junction-to-case thermal resistance enables 1.5 A operation without external heatsink under 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B182MR-G | Fixed 1.8 V output only; 1.0 A max output; SOT-23-5 package; 250 mV dropout at 100 mA | Not adjustable; lower current rating; unsuitable for multi-voltage ASIC designs requiring 1.8–3.3 V flexibility | Select only when fixed 1.8 V and space-constrained SOT-23 layout are mandatory |
| ROHM BD3572FP-E2 | Adjustable 1.5–5.5 V range; 2 A output; TO-252-5 package; 350 mV dropout at 2 A; includes soft-start | Higher current and wider voltage range; adds soft-start but lacks same 1 µA standby current | Prefer when >1.5 A or <0.6 V dropout is required; verify thermal design for 2 A continuous operation |
Compared with UPD121W00AT1F-E1-AT, the XC6219B182MR-G offers smaller footprint but sacrifices adjustability and current capability, while the BD3572FP-E2 extends performance at the cost of higher quiescent current and no sub-1 µA standby mode.
Availability
UPD121W00AT1F-E1-AT is available at Aetrix Electronics and suitable for digital consumer electronics, industrial imaging systems, and automotive infotainment platforms requiring stable component supply with long-term manufacturability.
Supply support for UPD121W00AT1F-E1-AT 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
Renesas Electronics Corporation is a Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog power ICs, and embedded solutions.
The μPD121WxxA series was designed as a high-current CMOS LDO family targeting power delivery to large-scale ASICs in digital appliances, emphasizing low dropout, low noise, and compatibility with ceramic capacitors.
FAQ
What is the minimum input voltage required for UPD121W00AT1F-E1-AT to regulate at 3.3 V output?
The UPD121W00AT1F-E1-AT requires VIN ≥ VO + 1 V per its recommended operating conditions. For a 3.3 V output, the minimum valid input is 4.3 V. At 1.5 A load, the dropout voltage is up to 1.0 V, so 4.3 V ensures regulation across temperature and process variation. Operating below this risks loss of regulation and increased output ripple.
Can UPD121W00AT1F-E1-AT be used with only ceramic capacitors, and what are the minimum values?
Yes, UPD121W00AT1F-E1-AT is explicitly qualified for laminated ceramic capacitors. CIN must be ≥0.1 µF and placed close to the INPUT pin; COUT must be ≥10 µF and placed within 1–2 cm of the OUTPUT and GND pins. The datasheet specifies stable operation with low-ESR ceramics, provided the ESR falls within the defined stable region for the given load current.
How does the ON/OFF pin function on UPD121W00AT1F-E1-AT, and what is its standby current?
The ON/OFF pin is active-high: applying ≥1.5 V enables regulation; pulling ≤0.5 V disables output and reduces total current draw to ≤1 µA. This standby current is measured with VON/OFF = 0 V and is independent of input voltage or load state. The pin has ≤2 µA leakage in both states, ensuring minimal control-line loading.
What is the purpose of Pin 3 being cut on UPD121W00AT1F-E1-AT, and is it electrically connected?
Pin 3 is a non-functional mechanical stub intentionally cut during TO-252 (MP-3ZK) package molding. It is not electrically connected to any internal circuitry and must not be soldered or tied to any net. Its presence is solely for mechanical alignment during automated placement; routing or grounding Pin 3 will cause assembly defects or thermal stress.
Does UPD121W00AT1F-E1-AT include reverse-voltage or reverse-current protection?
No, UPD121W00AT1F-E1-AT does not integrate reverse-voltage or reverse-current protection. The datasheet explicitly recommends adding an external Schottky barrier diode (D2) between OUTPUT and GND if the output node may fall below ground potential, and a diode (D1) between OUTPUT and INPUT if the output voltage could exceed the input - such as during hot-swap or load-dump events.
UPD121W00AT1F-E1-AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
UPD121W00AT1F-E1-AT FAQ
1.How can I place an order for UPD121W00AT1F-E1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for UPD121W00AT1F-E1-AT 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 UPD121W00AT1F-E1-AT reliable?
The price and inventory of UPD121W00AT1F-E1-AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPD121W00AT1F-E1-AT is usually 5 days.
3.What payment methods are accepted for UPD121W00AT1F-E1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UPD121W00AT1F-E1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UPD121W00AT1F-E1-AT?
UPD121W00AT1F-E1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UPD121W00AT1F-E1-AT 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 UPD121W00AT1F-E1-AT?
For technical support, including UPD121W00AT1F-E1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPD121W00AT1F-E1-AT requirements.
6.How does Aetrix verify that UPD121W00AT1F-E1-AT is sourced from the original manufacturer or authorized distributors?
All UPD121W00AT1F-E1-AT 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 UPD121W00AT1F-E1-AT meets industry standards.
7.What is the process for return or replacement of UPD121W00AT1F-E1-AT?
All UPD121W00AT1F-E1-AT units undergo pre-shipment inspection (PSI). If there is an issue with UPD121W00AT1F-E1-AT, 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 UPD121W00AT1F-E1-AT part is unused and in its original packaging.
Return procedure for UPD121W00AT1F-E1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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