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Asahi Kasei Microdevices/AKM AP1159ADS12
- Part No.:
- AP1159ADS12
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP1159ADS12.pdf
- Description:
- IC REG LINEAR 1.2V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,335
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Product details
Overview
AP1159ADS12 from Asahi Kasei Microdevices is a 1.2V fixed-output, 100mA low-dropout linear regulator in SOT23-5 package with ON/OFF control, ±50mV output voltage accuracy, and 80dB ripple rejection at 1kHz - designed for space-constrained battery-powered systems requiring stable low-noise power.
For engineers reviewing the AP1159ADS12 datasheet, AP1159ADS12 pinout, AP1159ADS12 application, or AP1159ADS12 equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade operating range (−40°C to +85°C), and real-world design implications for noise-sensitive LDO deployment.
Technical Context
The AP1159ADS12 uses a monolithic bipolar structure with integrated thermal shutdown, short-circuit protection, and reverse-bias overcurrent protection. Its NP (Noise Pass) terminal enables external capacitor tuning of output noise and ripple rejection - critical for analog/RF subsystems.
It operates across 2.1V–14.0V input range with 110μA quiescent current and 0.1μA standby current, supporting high-efficiency operation in always-on or duty-cycled applications. The high-accuracy 1.2V output (1.15V–1.25V min/max at 25°C) is trimmed during production and drifts only 60ppm/°C over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.2V nominal (1.15–1.25V guaranteed at 25°C); enables precise biasing of low-voltage logic and analog circuits without external feedback. |
| Max Output Current | 100mA continuous; sufficient for powering microcontrollers, sensors, or RF front-end ICs in compact portable devices. |
| Ripple Rejection | 80dB at 1kHz (VIN=2.3V); suppresses switching noise from upstream DC/DC converters feeding sensitive analog stages. |
| Output Noise | 30μVRMS (100Hz–80kHz); supports low-noise signal chains in audio, sensor, or precision ADC applications. |
| Quiescent Current | 110μA typical at zero load; minimizes battery drain in sleep-mode operation of IoT endpoints and wearables. |
| Standby Current | 0.1μA max; allows ultra-low-power system-level shutdown via VCONT pin without disconnecting input supply. |
| Operating Temp | −40°C to +85°C ambient; qualified for automotive accessory and industrial embedded use without derating. |
Pinout & Package
SOT23-5 surface-mount package: 2.9mm × 1.6mm × 1.1mm profile with gull-wing leads; optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCONT | ON/OFF control input | High-active logic: ≥1.8V enables regulation; ≤0.35V disables output; internal 500kΩ pull-down ensures default OFF state. |
| 2 - GND | Ground reference | Common return path for VIN, VOUT, and NP; must be low-impedance connection to minimize noise coupling. |
| 3 - NP | Noise pass terminal | Connects to dedicated ceramic capacitor (≥0.001μF) to ground; directly tunes output noise and low-frequency ripple rejection. |
| 4 - VOUT | Regulated output | Delivers stable 1.2V to load; requires ≥0.47μF ceramic capacitor (low ESR) for guaranteed stability across temperature and voltage. |
| 5 - VIN | Input supply | Accepts 2.1–14.0V; dropout voltage not explicitly specified but implied by architecture and test conditions (e.g., VIN = VOUT+1V used in characterization). |
Key Features
| Feature | Design Value |
|---|---|
| 0.47μF minimum output capacitance | Enables stable operation with small-footprint ceramic capacitors - reduces BOM cost and board area vs. larger electrolytics. |
| NP terminal for noise optimization | Allows independent tuning of output noise and ripple rejection via external capacitor, without affecting regulation loop stability. |
| ±50mV output voltage accuracy | Ensures predictable biasing of 1.2V-tolerant cores (e.g., ARM Cortex-M0+, LPDDR I/O) without post-production calibration. |
| Integrated protections | Thermal shutdown, short-circuit, and reverse-bias overcurrent protection eliminate need for external fault-handling circuitry. |
| Low quiescent + standby current | Supports >1-year battery life in coin-cell-powered devices with periodic wake-up cycles (e.g., BLE sensors, remote controls). |
Applications
| Automotive Accessory Power | Portable Medical Sensor |
|---|---|
|
Use Scenario: Powering CAN transceiver interface and microcontroller in rear-view camera module. IC Role / Device Role / Timing Role: Primary 1.2V LDO supplying core logic and analog front-end; enables clean power during engine cranking transients. Use Value: 80dB ripple rejection maintains CAN signal integrity when powered from noisy 12V vehicle bus; 0.1μA standby current preserves battery during vehicle off-state. |
Use Scenario: Regulating power for optical heart-rate sensor ASIC in wearable patch monitor. IC Role / Device Role / Timing Role: Low-noise 1.2V supply for photodiode amplifier and ADC reference; NP capacitor minimizes baseline drift. Use Value: 30μVRMS output noise prevents false pulse detection; 100mA capacity supports LED drive bursts without output sag. |
| Industrial Wireless Node | Mobile Communication Baseband |
|
Use Scenario: Supplying LoRaWAN transceiver and ultra-low-power MCU in battery-operated environmental sensor node. IC Role / Device Role / Timing Role: Always-on LDO with VCONT-controlled deep-sleep mode; coordinates with MCU's wake-up timer. Use Value: 110μA IQ extends 2xAA battery life to >5 years in 1-minute sampling interval; SOT23-5 footprint fits 10mm² PCB constraint. |
Use Scenario: Providing 1.2V core voltage to baseband processor in legacy 2G/3G feature phone. IC Role / Device Role / Timing Role: Secondary LDO after main PMIC; decouples processor core from shared rail noise. Use Value: ±50mV accuracy ensures reliable operation across −40°C to +85°C automotive cabin temperatures; 2.1V min VIN supports brownout resilience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, 100mA LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2112K-1.2TRG1 | CMOS-based; 60μA IQ; no NP pin; 65dB RR at 1kHz; 1.2V ±2% (±24mV) | Lacks noise-tuning capability; lower accuracy limits use in precision analog rails. | Preferred where ultra-low IQ dominates over noise performance and cost is constrained. |
| TPS7A0512PDQNR | 600mA output; 25μA IQ; 70dB RR at 1kHz; 1.2V ±1% (±12mV); requires ≥1μF output cap | Higher current and tighter accuracy, but larger package (X2SON-4) and no NP terminal for noise shaping. | Chosen when future-proofing for higher load or tighter tolerance is required, accepting trade-offs in noise control and footprint. |
Compared with AP1159ADS12, AP2112K-1.2TRG1 offers lower quiescent current but sacrifices noise tunability and output accuracy, while TPS7A0512PDQNR provides higher drive capability and tighter voltage tolerance at the expense of missing the NP-based noise optimization essential for analog-intensive designs.
Availability
AP1159ADS12 is available at Aetrix Electronics and suitable for automotive accessory equipment, battery-powered medical sensors, and industrial wireless nodes requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AP1159ADS12 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
Asahi Kasei Microdevices (AKM) is a Japanese semiconductor company specializing in analog, mixed-signal, and sensor solutions, with core expertise in power management and audio ICs.
The AP1159ADSXX series was developed specifically for space-constrained, low-noise applications in automotive and portable electronics - emphasizing small footprint, high PSRR, and robust protection features in a single SOT23-5 device.
FAQ
What is the guaranteed output voltage tolerance for AP1159ADS12 across temperature?
The AP1159ADS12 guarantees an output voltage of 1.12V to 1.28V over the full operating temperature range of −40°C to +85°C, as specified in Table 3 of the datasheet. This ±80mV window reflects both initial trim accuracy and temperature-induced drift (60ppm/°C), ensuring reliable operation in automotive and industrial environments without external trimming.
Can AP1159ADS12 operate with input voltages below 2.1V?
No - the AP1159ADS12 has a minimum recommended input voltage of 2.1V per Section 9 (Recommended Operation Conditions). Operation below this level is not characterized or guaranteed; output regulation may fail, and key parameters like ripple rejection and load regulation are not validated under sub-threshold conditions.
What is the function of the NP pin on AP1159ADS12, and how should it be used?
The NP (Noise Pass) pin on AP1159ADS12 connects to a dedicated bypass capacitor (typically ≥0.001μF ceramic to GND) that independently improves low-frequency ripple rejection and reduces output noise. Increasing NP capacitance enhances noise suppression but slows ON/OFF transient response - a deliberate design trade-off documented in Section 11.6 and 11.8.
Does AP1159ADS12 require a minimum load current to maintain regulation?
No - the AP1159ADS12 is specified to regulate stably down to zero load (IOUT = 0mA), as confirmed by quiescent current testing (IQ = 110μA typ. at IOUT = 0mA) and load regulation data covering 5mA–100mA. No minimum load resistor is needed, simplifying design for intermittent-load applications.
Is AP1159ADS12 RoHS-compliant and halogen-free?
Yes - AP1159ADS12 meets EU RoHS Directive requirements, as confirmed in AKM's official product documentation and material declarations. It is also halogen-free per J-STD-709, supporting environmentally compliant manufacturing for global electronics markets.
AP1159ADS12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- 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):
- 14V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 192 µA
- Current - Supply (Max):
- 3.3 mA
- PSRR:
- 80dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP1159ADS12 FAQ
1.How can I place an order for AP1159ADS12 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1159ADS12 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 AP1159ADS12 reliable?
The price and inventory of AP1159ADS12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1159ADS12 is usually 5 days.
3.What payment methods are accepted for AP1159ADS12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1159ADS12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1159ADS12?
AP1159ADS12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1159ADS12 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 AP1159ADS12?
For technical support, including AP1159ADS12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1159ADS12 requirements.
6.How does Aetrix verify that AP1159ADS12 is sourced from the original manufacturer or authorized distributors?
All AP1159ADS12 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 AP1159ADS12 meets industry standards.
7.What is the process for return or replacement of AP1159ADS12?
All AP1159ADS12 units undergo pre-shipment inspection (PSI). If there is an issue with AP1159ADS12, 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 AP1159ADS12 part is unused and in its original packaging.
Return procedure for AP1159ADS12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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