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Nexperia USA Inc. RP173N431D-TR-FE
- Part No.:
- RP173N431D-TR-FE
- Manufacturer:
- Nexperia USA Inc.
- Package:
- SC-74A, SOT-753
- Datasheet:
-
RP173N431D-TR-FE.pdf
- Description:
- RP173N - Low Supply Current 11V
- Quantity:
- Payment:
- Shipping:
Inventory:72,000
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Product details
Overview
RP173N431D-TR-FE from Ricoh Electronics is a 4.3 V fixed-output, 150 mA low-dropout linear regulator with ultra-low 2.0 µA supply current, reverse current protection, and CE-controlled active/standby operation in SOT-23-5 package. It features 0.61 V dropout at 150 mA, ±1.0% output accuracy, and supports 2.5–11 V input for dual-cell Li-ion battery-powered portable communication equipment.
For engineers reviewing the RP173N431D-TR-FE datasheet, RP173N431D-TR-FE pinout, RP173N431D-TR-FE application, or RP173N431D-TR-FE equivalent, this page delivers verified technical context, validated pin functions, real-world use scenarios in battery backup and standby power, and confirmed alternative parts with documented functional differences.
Technical Context
The RP173N431D-TR-FE implements a P-channel MOSFET pass element with integrated reverse current protection circuitry that actively disables conduction when VOUT ≥ VIN by detecting VREV = VDD − VOUT and enforcing hysteresis via VREV_DET (55–100 mV) and VREV_REL (70–120 mV). Its CE pin is "H"-active and includes built-in pull-down (0.3–0.9 µA), enabling fast turn-off and auto-discharge via an internal N-ch transistor (RLOW = 380 Ω).
It operates across −40°C to +85°C with input voltage range of 2.5 V to (VOUT + 6.5 V) ≤ 11 V, and maintains stability with ≥0.1 µF ceramic output capacitance. Load regulation is −3 to +35 mV over 0.1–150 mA, and line regulation is 0.02%/V typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.3 V ±1.0% (25°C), ensuring stable rail for 3.3 V/5 V logic interfaces and RF modules |
| Max Input Voltage | 11 V absolute maximum, supporting dual-cell Li-ion (8.4 V fully charged) with 2.1 V headroom |
| Dropout Voltage | 0.61 V typ. at 150 mA (VOUT = 4.3 V), enabling >3.7 V output under full load from 4.3 V input |
| Supply Current | 2.0 µA typ. (IOUT = 0 mA), minimizing quiescent drain in always-on battery backup circuits |
| Standby Current | 0.2 µA typ. (VCE = 0 V), critical for multi-week standby in IoT sensor nodes |
| Reverse Current | ≤0.16 µA (VIN ≤ 11 V, VOUT ≥ 1.5 V), preventing backfeed in redundant power paths |
| Short Limit | 45 mA typ., providing robust fault containment without external current-sense resistors |
Pinout & Package
SOT-23-5 package with exposed thermal pad electrically connected to GND; requires PCB ground plane connection for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Input power supply | Accepts 2.5–11 V; must be decoupled with ≥0.1 µF ceramic capacitor placed adjacent to pin |
| 2 - GND | Ground reference | Primary return path; connects to thermal pad; routing must minimize impedance for stability |
| 3 - CE | Chip enable control | H-active logic input; internal pull-down ensures default OFF state; enables auto-discharge on disable |
| 4 - NC | No connection | Electrically open; recommended to solder to PCB for mechanical reinforcement only |
| 5 - VOUT | Regulated output | Delivers 4.3 V ±1% up to 150 mA; requires ≥0.1 µF ceramic output capacitor with low ESR |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 2.0 µA typ. enables >1-year battery life in coin-cell–powered remote sensors |
| Integrated reverse current protection | Eliminates need for external blocking diode, reducing BOM count and forward voltage loss |
| Auto-discharge function (D version) | Internal 380 Ω N-ch switch discharges output capacitor rapidly on CE deactivation, preventing latch-up |
| Wide input range with low dropout | Operates down to 2.5 V input while delivering 4.3 V output, supporting partial battery discharge |
| High accuracy and stability | ±1.0% output tolerance and 0.02%/V line regulation ensure consistent MCU core voltage under varying source conditions |
Applications
| Portable Communication Equipment | Battery-Powered IoT Sensors |
|---|---|
|
Use Scenario: Power management in Bluetooth LE headsets with dual-cell Li-ion battery and standby audio processing. IC Role / Device Role / Timing Role: Primary LDO supplying 4.3 V to RF transceiver and low-power DSP during active and standby modes. Use Value: 0.2 µA standby current extends shelf life; reverse protection prevents backfeed from auxiliary PMIC rails. |
Use Scenario: Long-life environmental monitor using CR2032 coin cell and wake-on-event sensing. IC Role / Device Role / Timing Role: Standby-mode regulator enabling microamp-level system sleep while maintaining RTC and sensor bias. Use Value: 2.0 µA supply current allows >2 years runtime; auto-discharge avoids false wake-ups from residual VOUT charge. |
| Digital Home Appliances | Camera & Camcorder Power Rails |
|
Use Scenario: Always-on voice assistant module in smart speaker with USB-C and battery backup. IC Role / Device Role / Timing Role: Backup LDO delivering clean 4.3 V to microphone array and wake-word engine during AC loss. Use Value: 11 V max input accommodates USB PD negotiation spikes; ±1.0% accuracy ensures consistent ADC reference stability. |
Use Scenario: Image sensor bias supply in compact action camera with thermal constraints. IC Role / Device Role / Timing Role: Low-noise 4.3 V source for CMOS image sensor analog front-end and ISP core. Use Value: 30 dB ripple rejection at 1 kHz suppresses switching noise from main DC/DC; SOT-23-5 footprint saves board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2112K-4.3TRG1 | No reverse current protection; 60 µA quiescent current; no CE pin; fixed 4.3 V | Lacks auto-discharge and standby control; unsuitable for battery backup or multi-rail isolation | Select only for cost-sensitive, single-rail, non-standby applications where reverse leakage is externally managed |
| MCP1700T-4302E/TT | 2.3 µA quiescent current; no reverse protection; CE pin but no auto-discharge; 4.3 V fixed | Higher dropout (600 mV @ 250 mA); no integrated discharge path; limited to 6 V max input | Preferable only when input voltage stays ≤6 V and thermal margin permits higher dropout losses |
Compared with RP173N431D-TR-FE, AP2112K-4.3TRG1 trades reverse protection and ultra-low IQ for lower cost, while MCP1700T-4302E/TT offers similar IQ but lacks both reverse protection and auto-discharge-making RP173N431D-TR-FE uniquely suited for battery-isolated, CE-controlled standby systems.
Availability
RP173N431D-TR-FE is available at Aetrix Electronics and suitable for portable communication equipment, battery-powered IoT sensors, digital home appliances, and camera/camcorder power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for RP173N431D-TR-FE 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 power management ICs, including LDOs, DC/DC converters, and battery management solutions for portable and industrial applications.
The RP173x series is designed for ultra-low-power, high-reliability battery-backed systems-emphasizing reverse current protection, sub-µA standby, and seamless CE-controlled transitions between active and auto-discharge states.
FAQ
What is the minimum input voltage required for RP173N431D-TR-FE to regulate 4.3 V output?
The minimum input voltage is calculated as VOUT + dropout voltage. At 150 mA load, dropout is 0.61 V typ., so minimum VIN = 4.3 V + 0.61 V = 4.91 V. However, per datasheet, the device operates down to 2.5 V input-but regulation is only guaranteed when VIN ≥ VOUT + dropout, which varies with load and temperature. Below that, output sags.
Does RP173N431D-TR-FE require an external pull-up resistor on the CE pin?
No. The RP173N431D-TR-FE (D version) includes an internal CE pull-down (0.3–0.9 µA), eliminating need for external components. CE is H-active: applying ≥1.7 V enables output; ≤0.8 V disables it and triggers auto-discharge. External pull-up would conflict with internal design and is not recommended.
Can RP173N431D-TR-FE be used with tantalum output capacitors?
No. The datasheet explicitly warns against tantalum capacitors due to unstable operation caused by inappropriate ESR. Only ceramic capacitors ≥0.1 µF (e.g., Murata GRM155B31C104KA87D) are qualified for stable regulation across −40°C to +85°C. Tantalum use risks oscillation and output overshoot.
How does the reverse current protection operate when VOUT exceeds VIN?
When VREV = VDD − VOUT reaches VREV_DET (55–100 mV), the internal detector forces the P-ch pass transistor gate to VOUT, turning it off. This blocks conduction from VOUT to VDD/GND. Protection remains active until VREV rises above VREV_REL (70–120 mV), ensuring hysteresis and preventing chatter near threshold.
RP173N431D-TR-FE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- RP173x
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 4.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.76V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 3.7 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Reverse Current
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
RP173N431D-TR-FE FAQ
1.How can I place an order for RP173N431D-TR-FE through Aetrix?
Please submit a Request for Quotation (RFQ) for RP173N431D-TR-FE 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 RP173N431D-TR-FE reliable?
The price and inventory of RP173N431D-TR-FE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RP173N431D-TR-FE is usually 5 days.
3.What payment methods are accepted for RP173N431D-TR-FE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP173N431D-TR-FE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RP173N431D-TR-FE?
RP173N431D-TR-FE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RP173N431D-TR-FE 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 RP173N431D-TR-FE?
For technical support, including RP173N431D-TR-FE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP173N431D-TR-FE requirements.
6.How does Aetrix verify that RP173N431D-TR-FE is sourced from the original manufacturer or authorized distributors?
All RP173N431D-TR-FE 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 RP173N431D-TR-FE meets industry standards.
7.What is the process for return or replacement of RP173N431D-TR-FE?
All RP173N431D-TR-FE units undergo pre-shipment inspection (PSI). If there is an issue with RP173N431D-TR-FE, 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 RP173N431D-TR-FE part is unused and in its original packaging.
Return procedure for RP173N431D-TR-FE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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