My Inquiry
My Account
NXP Semiconductors LD6815TD/18P,125
- Part No.:
- LD6815TD/18P,125
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD6815TD/18P,125.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:60,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LD6815TD/18P,125 from NXP Semiconductors is a fixed-output 1.8 V, 150 mA low-dropout linear regulator with ultra-high PSRR (75 dB at 1 kHz), 250 mV dropout at full load, and auto-discharge functionality enabled via integrated pull-down transistor. It operates from 2.3 V to 5.5 V input and delivers ultra-low 40 µV RMS output noise (10 Hz–100 kHz), making it suitable for powering noise-sensitive analog and RF circuitry in portable consumer devices.
For engineers reviewing the LD6815TD/18P,125 datasheet, LD6815TD/18P,125 pinout, LD6815TD/18P,125 application, or LD6815TD/18P,125 equivalent, key selection criteria include its 1.8 V fixed output, SOT753 package compatibility, 0.1 µA shutdown quiescent current, 150 µs startup time, and verified auto-discharge behavior-critical for battery-powered systems requiring rapid output discharge during disable.
Technical Context
The LD6815TD/18P,125 implements a PMOS pass transistor architecture enabling low dropout and high PSRR across 1 kHz–100 kHz. Its enable input (EN) is active-HIGH with VIH ≥ 1.1 V and VIL ≤ 0.4 V, and internal overcurrent protection limits peak output to 200 mA while short-circuit current is clamped at 300 mA.
Unlike high-ohmic variants (e.g., LD6815TD/18H), the /18P suffix denotes an integrated 100 Ω pull-down transistor that actively discharges the output capacitor during disable mode, achieving 300 µs shutdown time (tsd(reg)) with 1 µF load capacitance-enabling fast system-level power sequencing in multi-rail mobile platforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.8 V ±2% (Tamb = +25 °C); ±3% over −40 °C to +85 °C - ensures stable core voltage for 1.8 V I/O domains. |
| Max output current | 150 mA continuous - supports moderate-power peripherals like camera modules or audio codecs. |
| Dropout voltage | 250 mV at 150 mA - enables operation down to VIN = 2.05 V, extending battery runtime in single-cell Li-ion systems. |
| PSRR | 75 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding noisy supply rails. |
| RMS output noise | 40 µV (10 Hz–100 kHz) - minimizes jitter in clock buffers and SNR degradation in ADC front-ends. |
| Quiescent current | 0.1 µA in shutdown (VEN ≤ 0.4 V) - preserves battery life during deep sleep modes. |
| Startup time | 150 µs to 95% of VOUT - meets fast wake-up timing requirements in mobile SoC subsystems. |
Pinout & Package
SOT753 (TSOP5) plastic surface-mount package: 2.9 × 1.5 × 1.0 mm, 5-lead, lead pitch 0.95 mm, JEDEC SC-74A compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.3–5.5 V unregulated supply; requires 1 µF ceramic decoupling capacitor. |
| 2 GND | Ground reference | Common return path for input, output, and enable; must connect to low-impedance ground plane. |
| 3 EN | Enable control | Active-HIGH logic input; drives internal pass transistor and pull-down switch when asserted ≥1.1 V. |
| 4 n.c. | No connection | Internally unconnected; must remain floating or tied to GND per layout guidelines. |
| 5 OUT | Regulated output | Delivers 1.8 V ±3%; integrates 100 Ω pull-down for auto-discharge during EN = LOW. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor discharges output capacitor in <300 µs upon disable-eliminates need for external bleed resistors in battery-critical designs. |
| Ultra-low shutdown current | 0.1 µA max at VEN ≤ 0.4 V-reduces standby leakage by >10× versus standard LDOs, extending shelf life of portable devices. |
| High PSRR at 1 kHz | 75 dB rejection of ripple on input rail-enables clean 1.8 V supply even when fed from noisy buck converter outputs. |
| ESD robustness | 6 kV HBM rating-ensures reliability during board handling and end-user assembly without additional protection circuitry. |
| Stable with low-ESR capacitors | Supports 0.7–1.0 µF X7R ceramics (5–500 mΩ ESR)-reduces BOM count and PCB area vs. tantalum-based solutions. |
Applications
| Smartphone Power Management | Digital Camera Sensor Bias |
|---|---|
Use Scenario: Supplying 1.8 V I/O domain for application processors and memory interfaces during active and sleep states. IC Role / Device Role / Timing Role: Primary low-noise post-regulator delivering stable voltage to high-speed digital interfaces with tight voltage tolerance. Use Value: 40 µV RMS noise and 75 dB PSRR prevent data corruption and timing jitter in DDR I/O and MIPI D-PHY links. | Use Scenario: Biasing CMOS image sensor analog front-end and ADC reference circuits. IC Role / Device Role / Timing Role: Clean, low-drift 1.8 V source for precision analog signal chains requiring minimal thermal drift. Use Value: ±3% output accuracy over −40 °C to +85 °C and 250 mV dropout maintain SNR across battery discharge cycles. |
| Tablet PC Audio Codec | Portable Media Player RF Front-End |
Use Scenario: Powering stereo audio codec ICs with integrated DACs and headphone amplifiers. IC Role / Device Role / Timing Role: Low-noise voltage source for analog audio paths where PSRR directly impacts THD+N performance. Use Value: 75 dB PSRR at 1 kHz suppresses switching artifacts from shared system power rails, reducing audible noise by >20 dB. | Use Scenario: Supplying 1.8 V bias to RF transceiver LNA and mixer stages in Bluetooth/Wi-Fi modules. IC Role / Device Role / Timing Role: Ultra-low-noise regulator isolating sensitive RF circuitry from digital supply noise. Use Value: 40 µV RMS noise prevents reciprocal mixing and phase noise degradation in receiver sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0518PDBVR | 1.8 V, 200 mA, 200 mV dropout, 45 µV noise, no auto-discharge; SOT-23-5 package. | Lacks integrated pull-down; requires external resistor for discharge-increases BOM cost and PCB area. | Select when higher output current or lower dropout is prioritized over auto-discharge capability. |
| MCP1700-1802E/TO | 1.8 V, 250 mA, 600 mV dropout, 30 µV noise, no auto-discharge; TO-92 through-hole package. | Higher dropout limits use below 2.4 V input; through-hole mounting incompatible with high-density SMT layouts. | Select only for legacy through-hole designs where space and input voltage headroom are not constraints. |
Compared with TPS7A0518PDBVR and MCP1700-1802E/TO, the LD6815TD/18P,125 uniquely combines 1.8 V regulation, SOT753 footprint, sub-300 µs auto-discharge, and 75 dB PSRR-making it optimal for compact, battery-constrained mobile systems requiring rapid power-state transitions and ultra-clean analog supplies.
Availability
LD6815TD/18P,125 is available at Aetrix Electronics and suitable for smartphone power management, digital camera sensor bias, tablet PC audio codec, and portable media player RF front-end applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LD6815TD/18P,125 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.
The LD6815 series was designed specifically for ultra-low-noise, high-PSRR power regulation in space-constrained portable electronics-emphasizing fast transient response, minimal quiescent current, and integrated auto-discharge for efficient power sequencing.
FAQ
What is the output voltage tolerance of the LD6815TD/18P,125 over temperature?
The LD6815TD/18P,125 maintains ±3% output voltage accuracy across the full operating ambient temperature range of −40 °C to +85 °C. At +25 °C, the tolerance tightens to ±2% for 1.8 V nominal output, ensuring reliable operation for 1.8 V I/O standards in consumer-grade mobile platforms.
Does the LD6815TD/18P,125 require external capacitors, and what values are recommended?
Yes, the LD6815TD/18P,125 requires a 1.0 µF X7R ceramic capacitor on both IN and OUT pins, with minimum ESR of 5 mΩ and maximum of 500 mΩ. The datasheet specifies 0.7 µF as the absolute minimum for stability, but 1.0 µF is recommended to ensure robust transient response and meet the 150 µs startup specification.
How does the auto-discharge function of the LD6815TD/18P,125 operate during shutdown?
When the EN pin is driven LOW (<0.4 V), the LD6815TD/18P,125 activates an internal 100 Ω pull-down transistor between OUT and GND, discharging the output capacitor in 300 µs (with 1 µF load). This eliminates residual voltage on downstream circuitry, enabling safe and rapid power-state transitions without external components.
What is the maximum input voltage the LD6815TD/18P,125 can withstand during transient conditions?
The LD6815TD/18P,125 supports a transient input voltage of up to +6.0 V for durations ≤4 ms, as specified in the Absolute Maximum Ratings table. Continuous operation remains limited to 2.3–5.5 V, but this transient rating allows safe handling of brief supply spikes common in battery-fed systems with switching regulators.
Is the LD6815TD/18P,125 compatible with lead-free reflow soldering processes?
Yes, the LD6815TD/18P,125 in SOT753 package is qualified for lead-free reflow soldering per J-STD-020C. Its package thickness (<1.6 mm) and volume (<350 mm³) require a peak reflow temperature of 260 °C, matching standard Pb-free profiles used in high-volume SMT assembly lines.
LD6815TD/18P,125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- 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):
- 0.25V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 35 µA
- Current - Supply (Max):
- 150 µA
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Transient Voltage
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
LD6815TD/18P,125 FAQ
1.How can I place an order for LD6815TD/18P,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6815TD/18P,125 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 LD6815TD/18P,125 reliable?
The price and inventory of LD6815TD/18P,125 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6815TD/18P,125 is usually 5 days.
3.What payment methods are accepted for LD6815TD/18P,125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6815TD/18P,125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6815TD/18P,125?
LD6815TD/18P,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6815TD/18P,125 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 LD6815TD/18P,125?
For technical support, including LD6815TD/18P,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6815TD/18P,125 requirements.
6.How does Aetrix verify that LD6815TD/18P,125 is sourced from the original manufacturer or authorized distributors?
All LD6815TD/18P,125 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 LD6815TD/18P,125 meets industry standards.
7.What is the process for return or replacement of LD6815TD/18P,125?
All LD6815TD/18P,125 units undergo pre-shipment inspection (PSI). If there is an issue with LD6815TD/18P,125, 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 LD6815TD/18P,125 part is unused and in its original packaging.
Return procedure for LD6815TD/18P,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD6815TD/18P,125 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
