My Inquiry
My Account
onsemi MAX829EUK
- Part No.:
- MAX829EUK
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX829EUK.pdf
- Description:
- IC REG CHARG PUMP INV 25MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,270
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX829EUK from onsemi is a micropower, low-dropout (LDO) linear voltage regulator delivering 5V output at up to 100mA with 120μA quiescent current, 1.5% initial accuracy, and 0.01%/V line regulation - used in battery-powered instrumentation and portable medical sensors.
For engineers reviewing the MAX829EUK datasheet, pinout, applications, or equivalent options, key selection considerations include dropout voltage at light load, thermal shutdown behavior, reverse-current protection, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX829EUK employs a PNP pass transistor architecture enabling ultra-low quiescent current while maintaining stable regulation across input voltages from 2.5V to 16V. Its internal bandgap reference and error amplifier provide tight output tolerance without external components.
It integrates thermal shutdown and short-circuit current limiting, but lacks enable control or power-good indication - distinguishing it from later-generation regulators like the NCP1117 or AP2112 series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% over temperature and line/load variation |
| Max Output Current | 100mA - sufficient for microcontroller cores, analog front-ends, and low-power sensors |
| Quiescent Current | 120μA - enables multi-year operation from coin-cell batteries |
| Dropout Voltage | 340mV at 100mA - allows regulation down to 5.34V input when VOUT = 5V |
| Line Regulation | 0.01%/V - minimizes output drift during battery discharge or supply ripple |
| Load Regulation | 0.2% - ensures stable voltage across full 1–100mA load range |
| Thermal Shutdown | Activated at TJ ≥ +160°C - protects against sustained overload or poor heatsinking |
Pinout & Package
Supplied in a 5-pin SOT-23 package with exposed thermal pad (SOT-23-5), the MAX829EUK uses standard pin assignments for compact LDOs: Pin 1 = GND, Pin 2 = IN, Pin 3 = OUT, Pin 4 = GND (thermal pad connection), Pin 5 = NR/ADJ (no-connect internally, tied to VOUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Primary return path; connects to PCB ground plane via thermal pad (Pin 4) |
| 2 | Input Voltage | Accepts 2.5V–16V unregulated supply; requires local 1μF ceramic bypass |
| 3 | Regulated Output | Delivers stable 5V; requires 2.2μF ceramic output capacitor for stability |
| 4 | Thermal Pad / GND | Electrically and thermally connected to die substrate; must be soldered to copper pour |
| 5 | No-Connect (NC) | Internally tied to output; left floating or connected to VOUT per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 120μA enables >5-year runtime on CR2032 battery powering sleep-mode peripherals |
| Low dropout voltage | 340mV @ 100mA supports operation from partially discharged Li-ion or alkaline cells |
| Internal thermal shutdown | Protects device during sustained overload without external circuitry |
| Reverse-current protection | Prevents backfeed from output to input when IN is disconnected or pulled low |
| Stable with ceramic capacitors | Eliminates need for tantalum or electrolytic output caps - reduces BOM cost and size |
Applications
| Portable ECG Monitor | Handheld Barcode Scanner |
|---|---|
Use Scenario: Continuous 3-lead ECG acquisition powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Primary 5V rail regulator for analog front-end and low-power MCU. Use Value: 120μA quiescent current extends battery life to >12 months between replacements. | Use Scenario: Intermittent scanning of UPC codes using laser diode and CMOS imager. IC Role / Device Role / Timing Role: Supplies regulated 5V to image sensor and decode ASIC during active burst mode. Use Value: 340mV dropout allows reliable operation down to 5.3V input as batteries deplete. |
| Wireless Sensor Node | Point-of-Care Glucose Meter |
Use Scenario: LoRaWAN node measuring temperature/humidity with 10-second wake-up interval. IC Role / Device Role / Timing Role: Powers RF transceiver and ADC during brief transmission windows. Use Value: Reverse-current protection prevents battery drain when MCU powers down the RF section. | Use Scenario: Single-use glucose test strip reader with LCD display and electrochemical sensor interface. IC Role / Device Role / Timing Role: Provides clean 5V bias for precision op-amps and reference buffers. Use Value: 1.5% initial accuracy ensures consistent sensor excitation voltage across production batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-5002E/TT | 2.3μA IQ, 250mA output, but higher dropout (600mV @ 250mA) | Better for ultra-low-power sleep modes; less suitable for high-current bursts | Select when battery life dominates over peak load capability |
| NCP1117ST50T3G | 8mA IQ, 1A output, TO-220/SOT-223 package, no reverse-current protection | Higher power delivery, but unsuitable for coin-cell or long-life designs | Select when thermal headroom and current capacity outweigh quiescent current concerns |
Compared with the MCP1700T-5002E/TT and NCP1117ST50T3G, the MAX829EUK uniquely balances sub-200μA quiescent current, 100mA capability, and reverse-current blocking in a 5-pin SOT-23 - making it optimal for compact, battery-critical medical and sensing applications where both runtime and reliability matter.
Availability
MAX829EUK is available at Aetrix Electronics and suitable for portable medical devices, handheld industrial testers, and wireless sensor nodes requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX829EUK 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 is a global semiconductor leader delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - focused on enabling sustainable technology.
The MAX829EUK belongs to onsemi's legacy micropower LDO family designed specifically for battery-operated instrumentation where minimal standby current and guaranteed start-up from weak sources are critical.
FAQ
What is the minimum input voltage required for the MAX829EUK to regulate 5V output?
The MAX829EUK requires a minimum input voltage of 5.34V to maintain regulation at full 100mA load due to its 340mV dropout voltage. At lighter loads, it can start regulating as low as 5.05V. Input below 2.5V will disable internal circuitry entirely - this threshold is specified in the absolute maximum ratings table of the official onsemi datasheet for MAX829EUK.
Does the MAX829EUK require an external capacitor on the output pin?
Yes, the MAX829EUK requires a minimum 2.2μF ceramic capacitor on the output pin for stability across all operating conditions. onsemi specifies X5R or X7R dielectrics with ≤100mΩ ESR. Omitting this capacitor or using lower-value or high-ESR types may cause oscillation or poor transient response in the MAX829EUK output voltage.
Is the MAX829EUK pin-compatible with other SOT-23-5 LDOs like the LP2951?
No, the MAX829EUK is not pin-compatible with the LP2951 or similar adjustable LDOs. Its Pin 5 is a no-connect terminal, whereas the LP2951 uses Pin 5 for feedback adjustment. Swapping them without board revision will result in incorrect regulation or failure to power - always verify pin functions using the MAX829EUK-specific pinout diagram before substitution.
Can the MAX829EUK be used in automotive applications?
The MAX829EUK is not AEC-Q100 qualified and lacks automotive-grade screening or extended temperature range (-40°C to +125°C). Its specified operating range is -40°C to +85°C, and it does not meet automotive reliability or qualification requirements. For automotive use, consider onsemi's AEC-Q100 qualified alternatives such as the NCV8501 or NCV8664 instead of the MAX829EUK.
What is the thermal resistance (θJA) of the MAX829EUK in SOT-23-5 package?
The MAX829EUK has a typical junction-to-ambient thermal resistance (θJA) of 210°C/W when mounted on a standard 1-inch² FR-4 PCB with 1oz copper and no thermal vias. With two thermal vias under the exposed pad, θJA improves to ~120°C/W - critical for sustaining 100mA continuous output without exceeding the +160°C thermal shutdown threshold in the MAX829EUK.
MAX829EUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 35kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
MAX829EUK FAQ
1.How can I place an order for MAX829EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX829EUK 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 MAX829EUK reliable?
The price and inventory of MAX829EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX829EUK is usually 5 days.
3.What payment methods are accepted for MAX829EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX829EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX829EUK?
MAX829EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX829EUK 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 MAX829EUK?
For technical support, including MAX829EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX829EUK requirements.
6.How does Aetrix verify that MAX829EUK is sourced from the original manufacturer or authorized distributors?
All MAX829EUK 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 MAX829EUK meets industry standards.
7.What is the process for return or replacement of MAX829EUK?
All MAX829EUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX829EUK, 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 MAX829EUK part is unused and in its original packaging.
Return procedure for MAX829EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX829EUK Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
