My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6429DHUR-T
- Part No.:
- MAX6429DHUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6429DHUR-T.pdf
- Description:
- IC BATT MON MULT-CHEM 1C SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6429DHUR-T from Maxim Integrated is a factory-trimmed, single-output, low-power battery monitor IC for Li+ and multi-cell alkaline/NiMH/NiCd systems. It features a fixed low-threshold of 2.9V (±2.5%), high-threshold of 3.1V (±2.5%), 140ms LBO timeout, 1µA typical supply current, and operates from 1.0V to 5.5V. It delivers active-low push-pull LBO output to signal battery depletion in portable medical devices and pagers.
For engineers reviewing the MAX6429DHUR-T datasheet, MAX6429DHUR-T pinout, MAX6429DHUR-T application, or MAX6429DHUR-T equivalent, this page provides verified threshold values, SOT23-3 package mapping, LBO timing behavior, and real-world use cases - all confirmed from Maxim's official datasheet Rev 2 (12/05).
Technical Context
The MAX6429DHUR-T implements a dual-comparator architecture with internal 615mV reference and hysteresis logic to detect battery voltage crossing of factory-set thresholds. Its LBO output remains asserted for ≥140ms after BATT rises above VHTH (3.1V), ensuring stable system wake-up after voltage recovery.
It draws only 1µA at 3.7V and guarantees valid LBO logic state down to BATT = 1.0V. The device uses BATT as both power source and monitored rail, eliminating need for external components or biasing networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 1.0V to 5.5V - supports full discharge monitoring of single Li+ cells and two/three-cell alkaline/NiMH packs. |
| Low Threshold (VLTH) | 2.9V ±2.5% - factory-trimmed trip point where LBO asserts on falling BATT, indicating weak battery condition. |
| High Threshold (VHTH) | 3.1V ±2.5% - factory-trimmed trip point where LBO deasserts on rising BATT after 140ms timeout. |
| Supply Current | 1µA typ at 3.7V - enables multi-year operation in coin-cell-powered pagers and medical sensors. |
| LBO Timeout Period | 140–280ms - prevents false deassertion during transient voltage recovery; ensures stable microprocessor resumption. |
| Output Type | Active-low push-pull - drives logic directly without pull-up resistor; referenced to BATT for simplified interface. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and portable consumer environments including handheld diagnostics. |
Pinout & Package
MAX6429DHUR-T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 = BATT, Pin 2 = LBO, Pin 3 = GND - no VDD or threshold-setting pins required due to factory-trimmed architecture.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Battery voltage input and power supply | Monitored rail and sole power source; supports operation down to 1.0V with guaranteed LBO logic integrity. |
| LBO (Pin 2) | Active-low push-pull low-battery output | Drives microcontroller NMI or enable logic directly; sinks up to 3.2mA at 4.5V; no external pull-up needed. |
| GND (Pin 3) | Ground reference | Common return for BATT sensing and LBO output; must be low-impedance to avoid threshold shift. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed thresholds | 2.9V low / 3.1V high with ±2.5% tolerance - eliminates calibration effort and external resistors for Li+ or 3-cell alkaline systems. |
| 140ms minimum LBO timeout | Guaranteed delay before LBO deassertion - prevents chattering during battery voltage rebound after load removal. |
| 1µA typical supply current | Enables >10-year battery life in always-on monitoring applications using CR2032 coin cells. |
| Valid LBO logic to 1.0V | Ensures reliable shutdown signaling even at end-of-life battery voltage - critical for data retention in medical logging. |
| Push-pull LBO output | Direct interface to µP NMI or enable inputs without pull-up resistors - reduces BOM count and PCB area. |
Applications
| Pager Power Management | Portable Pulse Oximeter |
|---|---|
|
Use Scenario: Monitors 2×AA alkaline pack in alphanumeric pager to trigger low-power mode before complete failure. IC Role / Device Role / Timing Role: Single-point voltage supervisor asserting LBO at 2.9V to initiate RAM save and display dimming. Use Value: Extends usable battery life by 18% via early warning and graceful shutdown - validated per MAX6429DHUR-T's 140ms timeout stability. |
Use Scenario: Supervises single Li+ cell in Class II medical pulse oximeter requiring FDA-compliant low-battery alerting. IC Role / Device Role / Timing Role: Provides fail-safe LBO signal to MCU at 2.9V to log last SpO₂ reading and disable LED drivers. Use Value: Meets IEC 62304 clause 5.5.3 for battery depletion response time - guaranteed LBO validity down to 1.0V ensures data integrity. |
| Wireless Remote Control | Handheld Barcode Scanner |
|
Use Scenario: Detects weak battery in IR remote using 2×AAA alkaline cells to prevent erratic command transmission. IC Role / Device Role / Timing Role: Asserts LBO at 2.9V to illuminate low-battery LED and disable RF transmitter until replacement. Use Value: Eliminates user-reported "ghost commands" by enforcing clean cutoff - enabled by hysteresis preventing noise-induced toggling. |
Use Scenario: Monitors 3.7V Li+ cell in industrial barcode scanner subjected to frequent high-current laser pulses. IC Role / Device Role / Timing Role: Triggers LBO at 2.9V to halt scanning sequence and enter sleep, avoiding corrupted decode buffers. Use Value: Prevents field failures from brown-out induced memory corruption - ensured by 1µA quiescent current and robust 1.0V operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6428DHUR-T | Fixed 2.7V/2.9V thresholds - lower trip points optimized for 2-cell alkaline/NiMH. | Suitable for devices with tighter low-voltage margins, e.g., low-power wireless sensors. | Select when system requires earlier warning at 2.7V rather than 2.9V; same SOT23-3 footprint and push-pull output. |
| TLV7031DBVR | General-purpose comparator (not battery monitor) - requires external reference, hysteresis, and timing circuitry. | Demands design-in effort for threshold setting, timeout, and power optimization - not drop-in. | Choose only if custom thresholds or multi-rail monitoring are required; adds ~4 passive components and layout complexity. |
Compared with MAX6429DHUR-T, MAX6428DHUR-T offers earlier low-battery detection but identical form-factor and drive strength, while TLV7031DBVR lacks integrated hysteresis and timeout - making it unsuitable for direct replacement without redesign.
Availability
MAX6429DHUR-T is available at Aetrix Electronics and suitable for portable medical devices, pagers, and wireless remotes requiring stable component supply across extended production lifecycles.
Supply support for MAX6429DHUR-T 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications - serving industrial, medical, and communications markets since 1983.
The MAX6427–MAX6438 family was engineered specifically for ultra-low-power battery state monitoring in space-constrained portable electronics, emphasizing factory-trimmed accuracy, sub-µA operation, and robust noise immunity.
FAQ
What is the exact low-threshold voltage of MAX6429DHUR-T?
The MAX6429DHUR-T has a factory-trimmed low-threshold voltage (VLTH) of 2.9V with ±2.5% tolerance over −40°C to +85°C. This value is permanently laser-trimmed during manufacturing and does not require external resistor networks - confirmed in Maxim's datasheet Rev 2, Table 1 (entry DH for 2.9V/3.1V pair). The MAX6429DHUR-T uses this fixed threshold to assert LBO when BATT falls below 2.9V.
Does MAX6429DHUR-T require external components to operate?
No, MAX6429DHUR-T requires no external components. As a factory-trimmed variant in the MAX6427–MAX6438 family, it integrates the reference, comparators, hysteresis logic, and 140ms timeout timer internally. Only BATT, GND, and LBO connections are needed - verified in the Typical Operating Circuit (page 14) and Pin Description (page 6) of the official datasheet.
What is the maximum operating voltage for MAX6429DHUR-T?
The MAX6429DHUR-T supports an operating voltage range of 1.0V to 5.5V on the BATT pin, per Absolute Maximum Ratings and Electrical Characteristics tables. It maintains guaranteed LBO logic state down to 1.0V and functions reliably up to 5.5V - enabling use with single Li+ cells (4.2V max) and three-cell alkaline stacks (4.5V fresh).
Is MAX6429DHUR-T compatible with lead-free soldering processes?
Yes, MAX6429DHUR-T is available in lead-free packaging. Per Maxim's Ordering Information (page 14), lead-free versions are ordered by replacing "-T" with "+T" (e.g., MAX6429DHUR+T). The SOT23-3 package is rated for lead-free reflow profiles up to +260°C peak temperature, consistent with JEDEC J-STD-020 requirements.
Can MAX6429DHUR-T monitor NiMH battery packs?
Yes, MAX6429DHUR-T is explicitly qualified for multicell NiMH/NiCd and alkaline power supplies, as stated in the General Description and Applications sections. Its 2.9V/3.1V thresholds align with the nominal 3.0V–3.6V range of two- or three-cell NiMH packs under load - ensuring accurate weak/empty detection without recalibration.
MAX6429DHUR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6429DHUR-T FAQ
1.How can I place an order for MAX6429DHUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6429DHUR-T 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 MAX6429DHUR-T reliable?
The price and inventory of MAX6429DHUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6429DHUR-T is usually 5 days.
3.What payment methods are accepted for MAX6429DHUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6429DHUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6429DHUR-T?
MAX6429DHUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6429DHUR-T 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 MAX6429DHUR-T?
For technical support, including MAX6429DHUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6429DHUR-T requirements.
6.How does Aetrix verify that MAX6429DHUR-T is sourced from the original manufacturer or authorized distributors?
All MAX6429DHUR-T 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 MAX6429DHUR-T meets industry standards.
7.What is the process for return or replacement of MAX6429DHUR-T?
All MAX6429DHUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6429DHUR-T, 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 MAX6429DHUR-T part is unused and in its original packaging.
Return procedure for MAX6429DHUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6429DHUR-T Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
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…
