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Analog Devices Inc./Maxim Integrated MAX6312UK46D3+T
- Part No.:
- MAX6312UK46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6312UK46D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,637
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Product details
Overview
The MAX6312UK46D3+T from Maxim Integrated is a 5-pin SOT23 programmable supervisory circuit that monitors VCC and an external undervoltage input (RST IN), asserts an active-high push/pull RESET output, and includes a manual-reset input (MR). It features a factory-programmed 4.63V ±2.5% VCC reset threshold, 140ms (min) reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1.0V - ideal for multivoltage embedded systems requiring reliable power-on and brownout reset.
For engineers reviewing the MAX6312UK46D3+T datasheet, MAX6312UK46D3+T pinout, MAX6312UK46D3+T application, or MAX6312UK46D3+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in portable and industrial systems, and two confirmed alternative parts with documented functional differences and selection guidance.
Technical Context
The MAX6312UK46D3+T implements a dual-monitoring architecture: one internal factory-trimmed voltage divider sets the primary VCC reset threshold at 4.63V, while a dedicated RST IN pin accepts an externally programmed undervoltage signal referenced to a 1.23V internal comparator. Its active-high push/pull RESET output sources/sinks current without requiring external pull-up components.
It integrates a manual-reset input (MR) with internal 63.5kΩ pull-up, supports MR-driven reset assertion with 500ns delay, and rejects fast transients on both VCC and RST IN via built-in immunity design - validated across -40°C to +85°C operation with ±2.5% threshold tolerance over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V ±2.5% at -40°C to +85°C - ensures reliable detection of 5V rail brownout before microprocessor malfunction |
| Reset Timeout Period | 140ms (min) - provides sufficient hold time for stable processor initialization after power recovery |
| Supply Current | 8µA typical at VCC = 5.5V - enables battery longevity in portable equipment with no external quiescent load |
| RESET Output Type | Active-high push/pull - eliminates need for external pull-up resistor and ensures valid logic level down to VCC = 1.0V |
| MR Input Logic | TTL/CMOS-compatible with 0.3×VCC low / 0.7×VCC high thresholds - allows direct interface with 3.3V or 5V control logic |
| RST IN Threshold Reference | 1.23V ±0.03V internal reference - enables precise external undervoltage monitoring of secondary rails (e.g., 3.3V, 2.5V) |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive-adjacent embedded applications |
Pinout & Package
MAX6312UK46D3+T is housed in a RoHS-compliant 5-pin SOT23 package (outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted - suitable for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push/pull reset output | Drives µP reset pin directly; sinks 3.2mA / sources 0.8×VCC at VCC > 4.25V; valid down to VCC = 1.0V |
| 2 - GND | System ground reference | Common return path for all internal comparators and output stage; must be low-impedance connection |
| 3 - RST IN | Adjustable undervoltage reset input | Compares external divided voltage to 1.23V reference; asserts reset when input falls below threshold |
| 4 - MR | Manual-reset input | Pull-low to force reset; internal 63.5kΩ pull-up allows NC or VCC tie; 500ns MR-to-RESET delay |
| 5 - VCC | Main supply and monitored rail | Power source and primary monitored voltage; internal trimmed divider sets 4.63V reset point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set precision reset threshold | 4.63V ±2.5% over full temperature range - eliminates calibration effort and external resistor networks |
| Dual-supply monitoring capability | Simultaneous VCC (4.63V) and RST IN (externally programmable) supervision - supports 5V/3.3V system integrity checks |
| Transient-immune architecture | Validated rejection of sub-200ns VCC/RST IN glitches - prevents spurious resets in noisy power environments |
| No external components required | Self-contained reset generation with integrated reference, timer, and push/pull driver - reduces BOM count and layout area |
| Guaranteed operation down to VCC = 1.0V | RESET remains logically valid during deep brownout - ensures deterministic µP behavior until complete power collapse |
Applications
| Industrial PLC I/O Module | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 5V main rail and 3.3V sensor interface rail in a DIN-rail mounted controller exposed to 24V field wiring noise. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting active-high RESET to ARM Cortex-M4 MCU upon any rail dropout; 140ms timeout ensures firmware boot stability. Use Value: Prevents corrupted register writes during 24V-induced 5V sag by detecting <4.51V (4.63V −2.5%) and holding reset for ≥140ms post-recovery. |
Use Scenario: Powers clinical-grade ECG front-end and display subsystem from Li-ion battery with dynamic 4.2V–3.0V discharge curve. IC Role / Device Role / Timing Role: Uses RST IN to monitor scaled-down battery voltage while VCC tracks regulated 3.3V; triggers shutdown before data loss. Use Value: Enables graceful firmware save-and-halt when battery drops below 3.4V (via RST IN divider), independent of 3.3V LDO regulation. |
| Automotive Infotainment Head Unit | Network Edge Gateway |
Use Scenario: Supervises 5V USB-C PD input and 1.8V SoC core rail in a thermally stressed dashboard environment (-40°C to +85°C). IC Role / Device Role / Timing Role: MR pin tied to vehicle ignition signal; asserts RESET on key-on to synchronize boot sequence with power stabilization. Use Value: Eliminates race condition between power rail settling and SoC release from reset, using MR's 500ns propagation guarantee. |
Use Scenario: Manages power sequencing for dual-core MIPS processor and 10/100 Ethernet PHY in fanless industrial router. IC Role / Device Role / Timing Role: VCC monitors 3.3V system rail; RST IN monitors 1.2V DDR termination voltage; single RESET output coordinates both domains. Use Value: Ensures DDR PHY is held in reset until both 3.3V and 1.2V are stable, preventing bus contention during cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6312EUK46D3+T | Extended temperature grade: -40°C to +85°C vs. 0°C to +70°C for MAX6312UK46D3+T | Required for automotive, outdoor, or industrial ambient deployments beyond commercial temperature range | Select MAX6312EUK46D3+T when operating in environments exceeding 70°C ambient or requiring extended qualification |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; 200ms min timeout; open-drain output; no RST IN or MR pins | Limited to single-rail 3.3V monitoring; requires external pull-up; lacks manual reset and auxiliary input flexibility | Choose TPS3808G33DBVR only for cost-sensitive, single-threshold 3.3V applications where RST IN/MR are unnecessary |
Compared with MAX6312UK46D3+T, the MAX6312EUK46D3+T extends thermal reliability without altering pinout or function, while the TPS3808G33DBVR trades multi-rail flexibility and manual control for lower unit cost and simpler integration in fixed 3.3V systems.
Availability
MAX6312UK46D3+T is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive infotainment head units, and network edge gateways requiring stable component supply across extended production lifecycles.
Supply support for MAX6312UK46D3+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 management, sensing, and interface applications - with emphasis on high-reliability, low-power, and small-footprint solutions.
The MAX6305–MAX6313 family was engineered specifically for multivoltage microprocessor supervision in space-constrained, battery-sensitive, and thermally demanding embedded systems - delivering factory-trimmed accuracy without external components.
FAQ
What is the exact factory-programmed reset threshold voltage for MAX6312UK46D3+T?
The MAX6312UK46D3+T has a nominal VCC reset threshold of 4.63V, with ±2.5% tolerance over the full operating temperature range (-40°C to +85°C). This value is factory-trimmed into the internal voltage divider and corresponds to the "46" in the part number per Table 1 of the datasheet. The actual measured threshold falls between 4.514V and 4.746V at room temperature, and remains within spec across temperature extremes.
Does MAX6312UK46D3+T support monitoring of a second voltage rail besides VCC?
Yes, MAX6312UK46D3+T supports secondary rail monitoring via its RST IN pin, which compares an externally divided input voltage against a precise 1.23V internal reference. This enables undervoltage supervision of rails such as 3.3V, 2.5V, or 1.8V - independent of the primary 4.63V VCC threshold - making MAX6312UK46D3+T suitable for true multivoltage system supervision.
What is the function and electrical behavior of the MR pin on MAX6312UK46D3+T?
The MR (Manual Reset) pin on MAX6312UK46D3+T is an active-low input with internal 63.5kΩ pull-up. Pulling MR below 0.3×VCC asserts RESET immediately, and RESET remains active for the full 140ms timeout after MR returns high. Its 500ns propagation delay and TTL/CMOS compatibility allow direct connection to microcontrollers or momentary switches without external conditioning - a core feature distinguishing MAX6312UK46D3+T from basic reset monitors.
Is MAX6312UK46D3+T compatible with 3.3V-only systems?
MAX6312UK46D3+T is not intended for 3.3V-only supervision because its factory-set VCC threshold is 4.63V - optimized for 5V rail monitoring. However, it can operate from a 3.3V supply if VCC ≥ (4.63V + 2.5%) ≈ 4.75V is not met; per datasheet conditions, VCC must exceed the reset threshold by at least 2.5% for proper monitoring. For 3.3V systems, use MAX6312UK33D3+T or similar 3.3V-threshold variant instead of MAX6312UK46D3+T.
What package type and lead finish does MAX6312UK46D3+T use?
MAX6312UK46D3+T uses a 5-pin SOT23 package (outline 21-0057) with lead-free (RoHS-compliant) finish, indicated by the "+T" suffix. It is supplied in tape-and-reel format only, with 3000 units per reel. The package has 0.95mm pin pitch, 2.9mm × 1.6mm body size, and no thermal pad - designed for reflow soldering and automated assembly in high-density layouts.
MAX6312UK46D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6312UK46D3+T FAQ
1.How can I place an order for MAX6312UK46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6312UK46D3+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 MAX6312UK46D3+T reliable?
The price and inventory of MAX6312UK46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6312UK46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6312UK46D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6312UK46D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6312UK46D3+T?
MAX6312UK46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6312UK46D3+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 MAX6312UK46D3+T?
For technical support, including MAX6312UK46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6312UK46D3+T requirements.
6.How does Aetrix verify that MAX6312UK46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6312UK46D3+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 MAX6312UK46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6312UK46D3+T?
All MAX6312UK46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6312UK46D3+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 MAX6312UK46D3+T part is unused and in its original packaging.
Return procedure for MAX6312UK46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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