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NXP Semiconductors LD6815TD/33P,125
- Part No.:
- LD6815TD/33P,125
- Manufacturer:
- NXP Semiconductors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LD6815TD/33P,125.pdf
- Description:
- IC REG LINEAR 3.3V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,235
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Product details
Overview
LD6815TD/33P,125 from NXP Semiconductors is a fixed-output 3.3 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 via integrated pull-down transistor. It operates from 2.3 V to 5.5 V input and targets power-sensitive portable applications requiring clean, stable voltage rails.
For engineers reviewing the LD6815TD/33P,125 datasheet, LD6815TD/33P,125 pinout, LD6815TD/33P,125 application, or LD6815TD/33P,125 equivalent, key selection criteria include its 40 µV RMS output noise (10 Hz–100 kHz), 0.1 µA shutdown quiescent current, 150 µs startup time, and SOT753 (TSOP5) package compatibility with space-constrained mobile designs.
Technical Context
The LD6815TD/33P,125 integrates a PMOS pass transistor with internal feedback loop compensation optimized for stability with 0.7–1.0 µF ceramic output capacitors. Its enable input (EN) accepts 1.1–5.5 V logic-high signals and drives the regulator into active mode with 150 µs typical startup delay.
In disabled state, the device actively pulls the output to ground via a 100 Ω internal pull-down transistor-enabling rapid discharge of downstream capacitance. This distinguishes it from high-ohmic variants (e.g., LD6815TD/33H) and supports controlled power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3 V ±2% over −40 °C to +85 °C; ensures stable core/peripheral rail for 3.3 V logic domains. |
| Max output current | 150 mA continuous; supports moderate-power subsystems like camera modules or RF front-ends. |
| Dropout voltage | 250 mV at 150 mA; enables operation down to VIN = 3.55 V while maintaining regulation. |
| PSRR | 75 dB at 1 kHz; suppresses switching noise from adjacent DC-DC converters in mixed-signal PCBs. |
| RMS output noise | 40 µV (10 Hz–100 kHz); minimizes jitter in analog/RF signal chains powered from this LDO. |
| Quiescent current | 0.1 µA in shutdown; extends battery life during system sleep modes in portable devices. |
| Startup time | 150 µs to 95% of 3.3 V; enables fast wake-up response in power-gated subsystems. |
| Shutdown discharge | Pull-down resistance = 100 Ω; discharges 10 µF load to 5% of 3.3 V in <300 µs per datasheet timing spec. |
Pinout & Package
SOT753 (TSOP5) plastic surface-mount package, 2.9 × 1.5 × 1.0 mm, 5-lead, lead pitch 0.95 mm. RoHS-compliant, moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input voltage supply | Accepts 2.3–5.5 V; requires ≥0.7 µF ceramic decoupling capacitor for stability. |
| 2 GND | Ground reference | Low-impedance return path; must connect directly to PCB ground plane for thermal and noise performance. |
| 3 EN | Enable control input | Active-HIGH logic; 1.1–5.5 V threshold; drives internal bias circuitry to activate regulator. |
| 4 n.c. | No connection | Internally unconnected; must remain floating or tied to GND per layout guidelines-no external routing. |
| 5 OUT | Regulated output | Delivers fixed 3.3 V; includes integrated 100 Ω pull-down transistor for auto-discharge on disable. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor on OUT pin enables rapid discharge of load capacitance during shutdown-critical for safe power sequencing. |
| Ultra-low shutdown IQ | 0.1 µA max quiescent current in EN = LOW state reduces standby power loss in battery-powered systems. |
| High PSRR (75 dB @ 1 kHz) | Effectively filters ripple from noisy switcher outputs, preserving signal integrity in audio, imaging, and RF subsystems. |
| ESD robustness | 6 kV HBM rating protects against handling damage during assembly and field operation without external protection diodes. |
| Stable with small ceramics | Guaranteed stability with 0.7–1.0 µF X7R MLCCs (ESR 5–500 mΩ), reducing BOM count and board area vs. tantalum alternatives. |
Applications
| Smartphone Core Power | Tablet PC I/O Rail |
|---|---|
Use Scenario: Powers baseband processor I/O banks requiring clean 3.3 V supply with fast transient response. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 3.3 V rail; enables low-noise interface signaling between AP and peripheral ICs. Use Value: 40 µV RMS noise and 75 dB PSRR prevent coupling of digital switching noise into sensitive analog interfaces. |
Use Scenario: Supplies USB PHY, SD card controller, and display interface circuits in tablet mainboard. IC Role / Device Role / Timing Role: Dedicated 3.3 V LDO with auto-discharge for controlled power-down of hot-pluggable peripherals. Use Value: 100 Ω pull-down ensures rapid discharge of bus capacitance before reconnection, preventing latch-up or data corruption. |
| Digital Still Camera Sensor Bias | Portable Media Player Audio Codec |
Use Scenario: Provides bias voltage to CMOS image sensor analog front-end and ADC reference circuitry. IC Role / Device Role / Timing Role: Low-noise 3.3 V source for precision analog blocks; activated only during capture sequence. Use Value: 150 µs startup time synchronizes with sensor initialization, while 0.1 µA shutdown IQ preserves battery during idle periods. |
Use Scenario: Powers stereo audio DAC and headphone amplifier in battery-operated media players. IC Role / Device Role / Timing Role: Clean 3.3 V supply for analog audio path; enabled/disabled with playback state. Use Value: Ultra-low RMS noise prevents audible hiss; auto-discharge eliminates pop/click artifacts during playback stop/start transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD6815TD/33H,125 | Same 3.3 V output and SOT753 package, but uses high-ohmic (3-state) output instead of pull-down; no auto-discharge. | Used where output must float during disable-e.g., shared-bus systems requiring isolation rather than discharge. | Select LD6815TD/33H,125 only if downstream circuitry requires open-circuit behavior during shutdown. |
| Torex XC6210B332MR-G | 3.3 V, 150 mA LDO in SOT-25; PSRR = 65 dB @ 1 kHz; no integrated discharge transistor; 1 µA shutdown IQ. | Lacks auto-discharge; higher noise (60 µV RMS); suited for cost-sensitive, non-sequencing applications. | Choose XC6210B332MR-G when board-level discharge circuitry already exists or PSRR/noise requirements are less stringent. |
Compared with LD6815TD/33H,125 and XC6210B332MR-G, the LD6815TD/33P,125 uniquely delivers guaranteed 100 Ω pull-down discharge, lowest RMS noise (40 µV), and highest PSRR (75 dB), making it optimal for tightly sequenced, noise-sensitive portable power rails.
Availability
LD6815TD/33P,125 is available at Aetrix Electronics and suitable for smartphone power management, tablet I/O rail conditioning, and portable imaging subsystems requiring stable component supply with consistent parametric performance across production lots.
Supply support for LD6815TD/33P,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 startup, minimal quiescent current, and integrated discharge for reliable power sequencing.
FAQ
What is the output voltage tolerance of the LD6815TD/33P,125 over temperature?
The LD6815TD/33P,125 delivers a nominal 3.3 V output with ±2% tolerance over the full operating ambient temperature range of −40 °C to +85 °C. At +25 °C, the variation tightens to ±0.5%, ensuring precise voltage delivery for logic and analog circuitry dependent on stable 3.3 V rails. This specification is confirmed in Table 8 of the official NXP datasheet Rev. 2 (2012).
Does the LD6815TD/33P,125 require an input capacitor?
Yes, the LD6815TD/33P,125 requires an external input capacitor of 0.7–1.0 µF (X7R ceramic, ±30% tolerance) placed close to the IN pin to maintain input voltage stability and suppress transients. This is specified in Section 10.1 and Table 9 of the NXP datasheet. Omitting it risks instability under dynamic load conditions or input ripple.
How does the auto-discharge function work in the LD6815TD/33P,125?
When the EN pin is driven LOW, the LD6815TD/33P,125 activates an internal 100 Ω pull-down transistor between the OUT pin and GND. This provides a low-impedance discharge path, enabling rapid decay of output capacitance-verified at <300 µs for 1 µF load in datasheet Figure 5. This feature is exclusive to /xxP variants and absent in /xxH versions.
What is the maximum allowable input voltage for the LD6815TD/33P,125?
The absolute maximum input voltage for the LD6815TD/33P,125 is +6.0 V for 4 ms transients, per Table 5 in the NXP datasheet. For continuous operation, the recommended input range is 2.3 V to 5.5 V. Exceeding 6.0 V-even briefly-risks permanent damage due to junction overstress.
Can the LD6815TD/33P,125 be used with ceramic output capacitors smaller than 1 µF?
Yes-the LD6815TD/33P,125 is stable with output capacitance as low as 0.7 µF (X7R, ±30% tolerance), as defined in Table 9 and Section 10.1 of the datasheet. Using 1.0 µF is recommended for margin, but 0.7 µF meets minimum stability requirements and supports miniaturized layouts where space is constrained.
LD6815TD/33P,125 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 3.3V
- 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/33P,125 FAQ
1.How can I place an order for LD6815TD/33P,125 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6815TD/33P,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/33P,125 reliable?
The price and inventory of LD6815TD/33P,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/33P,125 is usually 5 days.
3.What payment methods are accepted for LD6815TD/33P,125?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6815TD/33P,125 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6815TD/33P,125?
LD6815TD/33P,125 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6815TD/33P,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/33P,125?
For technical support, including LD6815TD/33P,125 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6815TD/33P,125 requirements.
6.How does Aetrix verify that LD6815TD/33P,125 is sourced from the original manufacturer or authorized distributors?
All LD6815TD/33P,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/33P,125 meets industry standards.
7.What is the process for return or replacement of LD6815TD/33P,125?
All LD6815TD/33P,125 units undergo pre-shipment inspection (PSI). If there is an issue with LD6815TD/33P,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/33P,125 part is unused and in its original packaging.
Return procedure for LD6815TD/33P,125:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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