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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Nexperia USA Inc. RP512Z321D-TR-F

Name: RP512Z321D-TR-F
Brand: Nexperia USA Inc.
SKU: RP512Z321D-TR-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RP512Z321D-TR-F

Manufacturer:: Nexperia USA Inc.

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: -

Datasheet:: RP512Z321D-TR-F.pdf

Description:: RP512Z - 0.3 IQ Low Quiescent Cu

Quantity:: RFQ Add To RFQ list

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Inventory:110,000

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Product details

Overview

RP512Z321D-TR-F from Ricoh Electronics is a 300 mA, ultra-low-quiescent-current (0.3 µA) synchronous buck DC/DC converter in WLCSP-8-P1 package, designed for battery-powered wearable and IoT devices requiring long runtime and miniaturization. It delivers fixed 3.2 V output with ±1.5% accuracy (VSET ≥ 1.2 V), operates from 2.0–5.5 V input, and features VFM control enabling high light-load efficiency.

For engineers reviewing the RP512Z321D-TR-F datasheet, RP512Z321D-TR-F pinout, RP512Z321D-TR-F application, or RP512Z321D-TR-F equivalent, key selection considerations include its 0.3 µA operating IQ, 0.01 µA standby current, auto-discharge function (D-version), WLCSP-8-P1 footprint (1.45 mm × 1.48 mm, 0.4 mm max height), and compatibility with coin-cell and USB-supplied systems.

Technical Context

The RP512Z321D-TR-F implements a VFM (Variable Frequency Modulation) control architecture to maintain ultra-low quiescent current across load conditions while delivering regulated 3.2 V output. Its internal synchronous rectification uses matched PMOS/NMOS switches (0.15 Ω typ. R_ON at VIN = 3.6 V) to minimize conduction loss.

It integrates undervoltage lockout (UVLO: 1.55–1.80 V rising threshold), soft-start (10 ms), and auto-discharge functionality that actively discharges C_OUT via an internal NMOS (R_DISN = 60 Ω) when CE is deasserted - critical for rapid system power-down in energy-harvesting and sensor nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	300 mA continuous - supports low-power microcontrollers, BLE radios, and MEMS sensors without external boost or LDO staging.
Quiescent Current	0.3 µA typical - enables multi-year battery life in always-on wearables powered by CR2032 or similar coin cells.
Standby Current	0.01 µA - ensures negligible drain during deep-sleep modes, preserving charge in intermittent-sensing applications.
Output Voltage Accuracy	±1.5% (at VSET ≥ 1.2 V) - guarantees stable 3.2 V supply for precision analog front-ends and ADC references.
Input Voltage Range	2.0 V to 5.5 V - accommodates single-cell Li-ion (3.0–4.2 V), alkaline (up to 3.2 V), and USB 5 V sources without input conditioning.
Auto-discharge Function	Enabled (D-version) - discharges output capacitor within milliseconds of CE deactivation, preventing residual voltage from interfering with system reset sequencing.
Switching Control	VFM mode - dynamically adjusts frequency (up to 1 MHz) to sustain >85% efficiency at 100 µA loads, reducing EMI vs. fixed-frequency PWM.

Pinout & Package

RP512Z321D-TR-F uses the WLCSP-8-P1 package (1.45 mm × 1.48 mm, 0.4 mm max thickness), optimized for space-constrained IC cards and thin wearables. The bottom-side thermal pad is electrically connected to GND and must be soldered to PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
A1, B1	VIN	Dual input power pins - reduce trace impedance and IR drop; require local 10 µF ceramic decoupling directly at A1/B1-to-GND.
C1	LX	Switch node - connects to external 2.2 µH inductor; high dv/dt demands short, wide routing away from sensitive analog traces.
A2	VOUT	Regulated output - feeds load directly; requires 22 µF low-ESR ceramic capacitor placed adjacent to pin with minimal loop area.
C2, B3, C3	GND	Three ground terminals - establish low-impedance return path; must be tied to solid ground plane under chip and inductor.
A3	CE	Active-high enable - logic-compatible with 1.0 V min high-level; open-circuit state is undefined; must be pulled high or low externally.

Key Features

Feature	Design Value
Ultra-low IQ operation	0.3 µA enables >10-year battery life in CR2032-powered devices drawing average 1 µA system current.
WLCSP-8-P1 footprint	1.45 mm × 1.48 mm area - reduces total solution size to 10.6 mm² including C_IN, C_OUT, and inductor, ideal for smart bands and patches.
Auto-discharge (D-version)	60 Ω NMOS discharge path lowers VOUT to 0 V in <10 ms after CE deactivation - eliminates need for external discharge circuitry.
VFM control with 1 MHz max f_SW	Maintains >90% efficiency at 100 µA load (VIN = 3.6 V) while avoiding audible switching noise common in fixed-frequency converters.
Integrated UVLO and soft-start	1.55–1.80 V UVLO hysteresis prevents brown-out oscillation; 10 ms soft-start limits inrush current into 22 µF C_OUT.

Applications

Smart Wearable Power Management

BLE Sensor Node Supply

Use Scenario: Powering a wrist-worn health monitor with optical heart-rate sensor, accelerometer, and BLE SoC.

IC Role / Device Role / Timing Role: Primary step-down regulator converting CR2032 (2.0–3.0 V) to stable 3.2 V for MCU and analog front-end.

Use Value: 0.3 µA IQ extends battery life beyond 2 years; auto-discharge ensures clean reset between measurement cycles.

Use Scenario: Energy-efficient environmental sensor node using ambient light harvesting and BLE 5.0 transmission.

IC Role / Device Role / Timing Role: Main power stage regulating variable harvester output (2.2–5.0 V) to fixed 3.2 V for ultra-low-power MCU and temperature/humidity sensors.

Use Value: VFM mode sustains >85% efficiency down to 10 µA load, maximizing harvested energy utilization.

Coin-Cell–Powered Medical Patch

Miniaturized IoT Edge Device

Use Scenario: Disposable ECG patch with 30-day monitoring duration powered by single AG13 alkaline cell.

IC Role / Device Role / Timing Role: Single-stage buck converter delivering precise 3.2 V to analog signal chain and low-power radio.

Use Value: ±1.5% output accuracy ensures consistent ADC reference; 0.4 mm profile fits sub-2 mm total device thickness.

Use Scenario: Asset tracker embedded in logistics tag, operating intermittently on Li-SOCl₂ primary cell.

IC Role / Device Role / Timing Role: Always-on power manager supplying 3.2 V to GPS module, cellular modem, and motion wake-up circuit.

Use Value: 0.01 µA standby current minimizes self-discharge; WLCSP package enables conformal coating over entire PCB assembly.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC9275B32ER-G	0.6 µA IQ, same 3.2 V fixed output, SOT-25 package (2.9 mm × 2.8 mm) - 4× larger footprint than WLCSP.	Lacks auto-discharge; requires external circuit for rapid VOUT discharge.	Select if board space allows larger package and auto-discharge is not required.
Analog Devices ADP5302ACBZ-3.2-R7	250 nA IQ (lower), but only 200 mA output; 1.22 mm × 0.83 mm WLCSP - smaller but lower current capability.	Optimized for sub-100 µA systems; insufficient for 300 mA BLE + sensor peak loads.	Select only for ultra-low-IQ niche applications where 200 mA output suffices.

Compared with XC9275B32ER-G and ADP5302ACBZ-3.2-R7, RP512Z321D-TR-F uniquely balances ultra-low IQ (0.3 µA), 300 mA capability, auto-discharge, and minimal WLCSP footprint - making it optimal for space- and battery-limited wearables where all four attributes are simultaneously required.

Availability

RP512Z321D-TR-F is available at Aetrix Electronics and suitable for wearable electronics, coin-cell–powered medical devices, and Bluetooth Low Energy sensor nodes requiring stable component supply and long-term design continuity.

Supply support for RP512Z321D-TR-F 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

Ricoh Electronics is a Japanese semiconductor manufacturer specializing in high-efficiency, low-power analog and power management ICs for portable and industrial applications.

The RP512x series was developed specifically for ultra-low-power battery-operated systems such as wearables, IoT endpoints, and energy-harvesting devices where miniaturization and multi-year runtime are critical design constraints.

FAQ

What is the purpose of the auto-discharge function in RP512Z321D-TR-F?

The auto-discharge function rapidly pulls VOUT to 0 V via an internal 60 Ω NMOS transistor when the CE pin transitions from high to low. This prevents residual voltage on C_OUT from interfering with system reset timing or causing latch-up in downstream logic, eliminating the need for external discharge resistors or FETs in compact designs.

Can RP512Z321D-TR-F operate from a single AA alkaline cell?

Yes - its 2.0–5.5 V input range supports operation from fresh AA alkaline (1.6 V nominal, up to 1.65 V per cell) through end-of-life (~0.9 V), though practical minimum VIN is 2.0 V. For single-cell alkaline use, pairing with a low-dropout pre-regulator or selecting a 1.8 V output variant (e.g., RP512Z181D) is recommended to extend usable voltage range.

Why does RP512Z321D-TR-F specify dual VIN pins (A1 and B1)?

The dual VIN pins reduce effective input trace resistance and inductance, minimizing voltage drop and noise coupling during high di/dt switching events. They must be independently decoupled with 10 µF ceramic capacitors placed as close as possible to each pin and connected to the same low-impedance ground plane - a layout requirement critical for stable operation at 0.3 µA IQ.

Is RP512Z321D-TR-F compatible with ceramic output capacitors rated below 6.3 V?

Yes, but with caution: the datasheet recommends C_OUT voltage rating ≥1.5× VOUT (i.e., ≥4.8 V) due to potential LX node voltage spikes during switch turn-off. Using a 6.3 V-rated 22 µF X5R/X7R ceramic capacitor (e.g., TAIYO YUDEN JMK107BBJ226MA-T) meets this requirement while maintaining low ESR and bias stability across temperature.

RP512Z321D-TR-F Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

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:: -

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Supplier Device Package:: -

RP512Z321D-TR-F FAQ

1.How can I place an order for RP512Z321D-TR-F through Aetrix?

Please submit a Request for Quotation (RFQ) for RP512Z321D-TR-F 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 RP512Z321D-TR-F reliable?

The price and inventory of RP512Z321D-TR-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RP512Z321D-TR-F is usually 5 days.

3.What payment methods are accepted for RP512Z321D-TR-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP512Z321D-TR-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RP512Z321D-TR-F?

RP512Z321D-TR-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RP512Z321D-TR-F 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 RP512Z321D-TR-F?

For technical support, including RP512Z321D-TR-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP512Z321D-TR-F requirements.

6.How does Aetrix verify that RP512Z321D-TR-F is sourced from the original manufacturer or authorized distributors?

All RP512Z321D-TR-F 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 RP512Z321D-TR-F meets industry standards.

7.What is the process for return or replacement of RP512Z321D-TR-F?

All RP512Z321D-TR-F units undergo pre-shipment inspection (PSI). If there is an issue with RP512Z321D-TR-F, 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 RP512Z321D-TR-F part is unused and in its original packaging.

Return procedure for RP512Z321D-TR-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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