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onsemi MC78PC28NTR
- Part No.:
- MC78PC28NTR
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MC78PC28NTR.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:138,500
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Product details
Overview
MC78PC28NTR from onsemi is a CMOS low-dropout linear voltage regulator delivering 2.8 V ±2.0% output with 150 mA nominal current, 0.20 V typical dropout at 100 mA, and 70 dB ripple rejection at 1 kHz - designed for battery-powered hand-held communication equipment requiring ultra-low quiescent current (35 µA typical in ON mode).
For engineers reviewing the MC78PC28NTR datasheet, pinout, applications, or equivalent options, this page provides verified technical context, SOT-23-5 pin mapping, real-world application constraints, and validated alternative options for portable power management design.
Technical Context
The MC78PC28NTR integrates an internal voltage reference, error amplifier, resistor divider network (R1/R2), current-limiting circuit, and chip-enable logic to regulate output voltage with high accuracy and fast transient response. Its CMOS architecture enables ultra-low supply current and low temperature drift (±100 ppm/°C).
It operates across −40°C to +85°C ambient, supports input voltages up to 8.0 V, and maintains regulation down to VIN = VOUT + 0.20 V at 100 mA load. The CE pin allows active control of ON/OFF states, with VIH ≥ 1.5 V and VIL ≤ 0.25 V defining logic thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.80 V ±2.0% - tightly regulated for stable 2.8 V rail in RF front-ends or baseband ICs |
| Max Output Current | 150 mA - sufficient for GSM/CDMA transceiver modules and low-power microcontrollers |
| Dropout Voltage | 0.20 V typical @ 100 mA - enables operation from single-cell Li-ion (3.0 V min) or two-cell alkaline |
| Ripple Rejection | 70 dB @ 1 kHz - suppresses switching noise from DC-DC converters feeding the LDO input |
| Supply Current | 35 µA typical (ON), 0.1 µA typical (standby) - extends battery life in always-on sensor nodes |
| Output Noise | 30 µVrms (10 Hz–100 kHz) - low enough for analog signal chains and ADC reference supplies |
| Line Regulation | 0.05%/V - minimizes output variation during battery discharge or input ripple |
Pinout & Package
SOT-23-5 package (Case 1212, N suffix), 2.8 mm × 2.5 mm footprint, 1.0–1.3 mm height, Pb-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply connection | Accepts 2.98 V to 8.0 V; requires local 1.0 µF ceramic bypass capacitor |
| 2 - GND | Ground reference | Low-impedance return path; must be routed wide and short to minimize noise coupling |
| 3 - CE | Chip enable input | Active-high logic control: ≥1.5 V enables regulation; ≤0.25 V disables output and reduces current to 0.1 µA |
| 4 - N/C | No connection | Internally unconnected; must remain floating - no external tie or pull-up/down |
| 5 - VOUT | Regulated output | Delivers 2.8 V ±2.0%; requires 4.7–10 µF output capacitor with ESR < 1 Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ON-mode supply current | 35 µA typical - enables multi-year operation from coin cells in IoT endpoints |
| Built-in chip enable (CE) circuit | 0.1 µA standby current with CE = LOW - supports deep-sleep modes in portable devices |
| Low temperature drift | ±100 ppm/°C - ensures < ±3 mV output shift over −40°C to +85°C operating range |
| Fast dynamic line/load response | Stabilizes within microseconds after input or load step - critical for burst-mode RF transmission |
| Identical pinout to LP2980 series | Drop-in layout compatibility with LP2980-2.8/LP2981-2.8 - simplifies second-source qualification |
Applications
| Cellular Phone Power Supply | Cordless Phone Base Station |
|---|---|
Use Scenario: Powers RF transceiver and baseband processor in dual-mode GSM/CDMA handsets using single Li-ion cell. IC Role / Device Role / Timing Role: Primary 2.8 V LDO supplying sensitive analog blocks and digital core logic. Use Value: 70 dB ripple rejection prevents switching noise from DC-DC converter from degrading RF SNR and bit error rate. |
Use Scenario: Supplies 2.8 V to PHS/DECT cordless phone base station controller and audio codec. IC Role / Device Role / Timing Role: Low-noise post-regulator for clean power to crystal oscillator and PLL circuits. Use Value: 30 µVrms output noise avoids phase jitter in 1.9 GHz RF synthesizers and improves voice call clarity. |
| Digital Camera Image Sensor Bias | Portable Medical Monitor Front-End |
Use Scenario: Provides 2.8 V bias to CMOS image sensor and analog front-end in compact digital cameras. IC Role / Device Role / Timing Role: Precision voltage source for sensor pixel array and column ADC reference. Use Value: ±2.0% output accuracy and ±100 ppm/°C drift ensure consistent exposure calibration across operating temperatures. |
Use Scenario: Powers ECG amplifier and low-noise instrumentation ADC in handheld patient monitors. IC Role / Device Role / Timing Role: Ultra-low-noise, low-drift supply for analog signal conditioning chain. Use Value: 30 µVrms noise floor preserves microvolt-level biopotential signals without amplifying supply-induced artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2980AIM5-2.8/NOPB | Same SOT-23-5 pinout; 60 µA typical supply current (vs. 35 µA); 0.35 V dropout @ 100 mA (vs. 0.20 V) | Higher dropout limits use with lower VIN sources (e.g., discharged Li-ion below 3.15 V) | Select when legacy LP2980 footprint reuse is required and ultra-low IQ is not critical |
| MCP1700T-2802E/TT | 350 nA standby current (vs. 0.1 µA); 125 mA max output (vs. 150 mA); 600 mV dropout @ 250 mA | Lower max current and higher dropout restrict use in high-pulse-load scenarios like GSM transmit bursts | Select when nanowatt standby dominates design priority and peak load stays below 125 mA |
Compared with LP2980AIM5-2.8/NOPB and MCP1700T-2802E/TT, the MC78PC28NTR offers the lowest dropout and best balance of ultra-low IQ (35 µA), 150 mA capability, and 2.8 V precision - making it optimal for space-constrained, battery-critical hand-held RF systems where input headroom is minimal.
Availability
MC78PC28NTR is available at Aetrix Electronics and suitable for cellular phones, cordless telephony, and portable medical monitors requiring stable component supply with long-term lifecycle support.
Supply support for MC78PC28NTR 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and portable electronics.
The MC78PC00 series was developed specifically for ultra-low-noise, low-quiescent-current power regulation in hand-held wireless devices - emphasizing minimal board space, extended battery life, and robust performance under dynamic load conditions.
FAQ
What is the maximum input voltage rating for the MC78PC28NTR?
The MC78PC28NTR has an absolute maximum input voltage (VIN) rating of 9.0 V, but its recommended operating input voltage range is up to 8.0 V per electrical characteristics. Exceeding 8.0 V may degrade long-term reliability or trigger thermal shutdown under high load, so designs should maintain VIN ≤ 8.0 V for continuous operation.
Does the MC78PC28NTR require an external output capacitor, and what type is recommended?
Yes, the MC78PC28NTR requires an external output capacitor for stability. The datasheet specifies 4.7 µF to 10 µF ceramic capacitors with ESR < 1 Ω. Tantalum capacitors are also acceptable if ESR falls within the shaded region of Figure 11. Avoid mixing ceramic and tantalum types on the same VOUT node, as this can cause instability.
What is the function of Pin 4 (N/C) on the MC78PC28NTR, and how should it be handled on the PCB?
Pin 4 on the MC78PC28NTR is designated N/C (No Connection) and is internally unconnected. It must remain electrically floating - do not tie to GND, VIN, or any other net. PCB layout should avoid routing traces or copper pours near Pin 4 to prevent parasitic coupling or unintended capacitance that could affect CE pin noise immunity.
How does the MC78PC28NTR behave when the CE pin is left unconnected?
When the CE pin is left unconnected, the MC78PC28NTR enters an undefined state due to lack of defined logic level. The internal CE pull-down resistance is 2.5–10 MΩ, which may allow leakage or noise to inadvertently disable the device. Always actively drive CE with a known voltage (≥1.5 V for ON, ≤0.25 V for OFF) or use a pull-down resistor to GND for default-ON operation.
Is the MC78PC28NTR RoHS-compliant and halogen-free?
Yes, the MC78PC28NTR is RoHS-compliant and halogen-free. The "G" suffix variant (MC78PC28NTRG) explicitly denotes Pb-free packaging, and the base part meets JESD204B and IEC 61249-2-21 standards. Both NTR and NTRG versions comply with EU RoHS Directive 2011/65/EU and are suitable for green manufacturing.
MC78PC28NTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 100mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
MC78PC28NTR FAQ
1.How can I place an order for MC78PC28NTR through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78PC28NTR 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 MC78PC28NTR reliable?
The price and inventory of MC78PC28NTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78PC28NTR is usually 5 days.
3.What payment methods are accepted for MC78PC28NTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78PC28NTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78PC28NTR?
MC78PC28NTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78PC28NTR 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 MC78PC28NTR?
For technical support, including MC78PC28NTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78PC28NTR requirements.
6.How does Aetrix verify that MC78PC28NTR is sourced from the original manufacturer or authorized distributors?
All MC78PC28NTR 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 MC78PC28NTR meets industry standards.
7.What is the process for return or replacement of MC78PC28NTR?
All MC78PC28NTR units undergo pre-shipment inspection (PSI). If there is an issue with MC78PC28NTR, 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 MC78PC28NTR part is unused and in its original packaging.
Return procedure for MC78PC28NTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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