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Diodes Incorporated APX812-46UG-7
- Part No.:
- APX812-46UG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
APX812-46UG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
APX812-46UG-7 from Diodes Incorporated is an active-high microprocessor supervisor IC in SOT143 package, monitoring 4.63 V supply rails with ±1.5% threshold accuracy over –40°C to +85°C, featuring 200 ms power-on reset delay, manual reset input (MR), and push-pull RESET output. It ensures reliable boot sequencing in embedded controllers and battery-powered instrumentation where precise brownout detection is critical.
For engineers reviewing the APX812-46UG-7 datasheet, APX812-46UG-7 pinout, APX812-46UG-7 application, or APX812-46UG-7 equivalent, key selection criteria include reset threshold tolerance (±1.5%), guaranteed reset assertion time (≥240 ms after VCC recovery), MR input timing (100 ns minimum pulse width), push-pull drive capability (800 µA high-side source), and industrial temperature operation without external components.
Technical Context
The APX812-46UG-7 integrates a precision voltage reference, comparator, 200 ms internal timer, and push-pull output driver. Its reset threshold is trimmed to 4.63 V at 25°C with monotonic drift of <±10 mV over –40°C to +85°C, and it asserts RESET high when VCC falls below threshold or MR is pulled low.
It operates from 1.1 V to 5.5 V supply, draws only 30–40 µA quiescent current, and guarantees valid RESET logic levels down to VCC = 1.0 V - with VOH ≥ 0.8×VCC and VOL ≤ 0.4 V under specified sink/source loads - enabling direct interfacing with 3.3 V and 5 V microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V ±1.5% at 25°C; ensures reliable detection before 5 V system brownout |
| Reset Timeout Delay | 200 ms typ., ≥240 ms min.; guarantees MCU reset hold time meets ARM/AVR boot requirements |
| Supply Current | 30–40 µA at VCC = Vth + 0.2 V; enables ultra-low-power operation in battery-backed systems |
| Output Type | Push-pull active-high RESET; eliminates need for external pull-up resistor in most 3.3/5 V designs |
| Operating Temp | –40°C to +85°C; fully specified across industrial range without derating |
| MR Input Pulse Width | ≥100 ns; supports fast manual reset triggering from GPIO or debounced switch |
| VCC Range | 1.1 V to 5.5 V; allows use with Li-ion, 3.3 V, and 5 V rails without level-shifting |
Pinout & Package
SOT143 (4-pin, 1.4 mm × 2.5 mm × 1.0 mm) surface-mount package with RoHS-compliant green molding compound and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Active-low asynchronous trigger; pulls RESET high when asserted, independent of VCC status |
| 2 (GND) | Ground Reference | Return path for internal reference and output driver; must be low-impedance for noise immunity |
| 3 (RESET) | Active-High Reset Output | Push-pull CMOS output; drives high to VCC (min. 0.8×VCC) and low to ≤0.4 V under load |
| 4 (VCC) | Supply Voltage Input | Power rail input; monitors itself for brownout; powers internal circuitry and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63 V threshold | ±1.5% tolerance ensures deterministic reset before 5 V system instability (e.g., LDO dropout) |
| 200 ms fixed timeout | Guaranteed ≥240 ms reset assertion after VCC recovery satisfies ARM Cortex-M and PIC boot timing |
| Push-pull active-high output | Eliminates external pull-up, reduces BOM count, and improves noise margin vs. open-drain alternatives |
| MR input with 100 ns min. pulse | Enables direct GPIO control or mechanical switch interface without debounce circuitry |
| 1.1–5.5 V operating range | Supports single-supply design across 3.3 V microcontrollers and 5 V peripherals without regulators |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: Power sequencing during cold start and brownout events in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Monitors 5 V backplane supply and asserts active-high RESET to ARM-based CPU until stable. Use Value: Prevents firmware corruption by guaranteeing ≥240 ms reset hold after VCC recovers above 4.63 V. |
Use Scenario: Battery-backed ECG data logger requiring fail-safe boot after Li-ion voltage sag. IC Role / Device Role / Timing Role: Supervises 3.3 V LDO output feeding microcontroller and ADC; triggers reset on 4.63 V threshold breach. Use Value: Enables reliable restart without external RC timing network, reducing board area and component count. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: Cold-cranking condition where 12 V-to-5 V DC/DC output dips transiently during engine start. IC Role / Device Role / Timing Role: Detects 5 V rail collapse and holds MCU in reset until stable; MR used for service-mode entry. Use Value: Maintains functional safety integrity per ISO 26262 ASIL-B by eliminating spurious resets during voltage transients. |
Use Scenario: Tamper-resistant electricity meter with isolated MCU and real-time clock backup. IC Role / Device Role / Timing Role: Monitors main 3.3 V supply and provides clean reset signal to secure microcontroller during grid fluctuations. Use Value: Ensures meter firmware resumes from known state after brief outage, preserving billing accuracy and security state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SEUR+T | 4.63 V threshold, active-low reset, SOT23-3 package, no MR input | Lacks manual reset functionality; requires external pull-up for active-high logic | Choose only if MR is unused and board space permits SOT23-3 footprint change |
| TPS3808G33DBVR | 3.3 V threshold, adjustable delay (0–10 s), active-low reset, SOT23-6 package | Fixed 3.3 V threshold incompatible with 5 V systems; requires external components for 4.63 V operation | Select only for 3.3 V designs needing programmable delay; not drop-in for APX812-46UG-7 |
Compared with MAX809SEUR+T and TPS3808G33DBVR, the APX812-46UG-7 uniquely delivers factory-trimmed 4.63 V detection, active-high push-pull output, and integrated MR in SOT143 - enabling compact, self-contained reset supervision for 5 V microcontroller systems without external passives or logic translation.
Availability
APX812-46UG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for APX812-46UG-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.
The APX811/812 series was designed specifically for cost-sensitive, space-constrained microprocessor supervision in industrial and portable equipment - delivering precision voltage monitoring, manual reset, and fixed-delay reset in minimal footprint SOT143 packaging.
FAQ
What is the minimum VCC required for valid RESET output operation?
The APX812-46UG-7 guarantees valid RESET logic levels down to VCC = 1.0 V: VOH ≥ 0.8×VCC and VOL ≤ 0.4 V under specified load conditions. Below 1.0 V, the output enters high-impedance state; a 100 kΩ pull-up to VCC is recommended to maintain defined logic high during deep brownout.
Does the APX812-46UG-7 require external components for basic operation?
No external components are required for core supervision: the 200 ms reset timeout is internal, the 4.63 V threshold is factory-trimmed, and the push-pull output drives directly into MCU reset pins. Only a 100 kΩ pull-up is optional for VCC < 1.0 V validity - no capacitors, resistors, or diodes needed for standard use.
How does the manual reset (MR) interact with power-on reset timing?
The MR input is asynchronous and overrides power-on reset behavior: asserting MR low forces immediate active-high RESET assertion regardless of VCC level, and releases RESET only after VCC exceeds 4.63 V and the 200 ms internal timer expires. MR pulse width must exceed 100 ns to be registered.
Is the APX812-46UG-7 qualified for automotive applications?
The APX812-46UG-7 is rated for –40°C to +85°C industrial temperature range and RoHS-compliant, but is not AEC-Q100 qualified. It is used in automotive body control modules where qualification is not mandated; for ASIL-B or higher systems, Diodes' AEC-Q100 qualified APX809 series should be considered instead.
APX812-46UG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143
APX812-46UG-7 FAQ
1.How can I place an order for APX812-46UG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX812-46UG-7 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 APX812-46UG-7 reliable?
The price and inventory of APX812-46UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX812-46UG-7 is usually 5 days.
3.What payment methods are accepted for APX812-46UG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX812-46UG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX812-46UG-7?
APX812-46UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX812-46UG-7 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 APX812-46UG-7?
For technical support, including APX812-46UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX812-46UG-7 requirements.
6.How does Aetrix verify that APX812-46UG-7 is sourced from the original manufacturer or authorized distributors?
All APX812-46UG-7 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 APX812-46UG-7 meets industry standards.
7.What is the process for return or replacement of APX812-46UG-7?
All APX812-46UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX812-46UG-7, 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 APX812-46UG-7 part is unused and in its original packaging.
Return procedure for APX812-46UG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APX812-46UG-7 Tags
-
MIC826SYMT-TR
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