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Diodes Incorporated APX812-23UG-7
- Part No.:
- APX812-23UG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
APX812-23UG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
APX812-23UG-7 from Diodes Incorporated is an active-high microprocessor supervisor IC in SOT143 package, monitoring 2.25 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 low-voltage embedded controllers and battery-powered instrumentation.
For engineers reviewing the APX812-23UG-7 datasheet, APX812-23UG-7 pinout, APX812-23UG-7 application, or APX812-23UG-7 equivalent, key selection criteria include reset threshold tolerance, MR timing compatibility, industrial temperature operation, push-pull drive strength, and SOT143 footprint constraints in space-constrained PCB layouts.
Technical Context
The APX812-23UG-7 implements a precision bandgap-based voltage monitor with internal 200 ms timeout timer and active-low manual reset input (MR). Its reset assertion logic holds RESET high for ≥240 ms after VCC rises above 2.25 V, and reasserts immediately on brownout or MR pull-down.
It operates across 1.1 V to 5.5 V supply range with 30 µA typical quiescent current at 25°C, delivers 800 µA source/sink capability on RESET, and maintains valid logic levels down to VCC = 1.0 V - requiring external 100 kΩ pull-up for RESET validity below 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.25 V ±1.5% at 25°C; ensures reliable detection of 2.25 V rail collapse without false triggering near nominal voltage. |
| Reset Timeout Delay | 200 ms typ. (140–280 ms); guarantees minimum reset pulse width for full microprocessor initialization. |
| Supply Current | 30 µA typ. at 25°C; enables ultra-low-power operation in always-on monitoring circuits. |
| RESET Output Type | Push-pull active-high; eliminates need for external pull-up resistor in most MCU interface designs. |
| Operating Temperature | –40°C to +85°C; supports industrial-grade reliability without derating in ambient-constrained enclosures. |
| MR Input Logic | Active-low with 100 ns minimum pulse width; compatible with standard GPIO or momentary switch debouncing. |
| Package | SOT143 (4-pin); 2.9 mm × 1.3 mm footprint ideal for compact portable and automotive control modules. |
Pinout & Package
SOT143 surface-mount package with 1.3 mm height, 2.9 mm × 1.3 mm body, and gull-wing leads; RoHS-compliant, lead-free finish, green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Power supply input | Accepts 1.1–5.5 V; powers internal reference, timer, and output driver. |
| 2 (MR) | Manual reset input | Active-low; asserts RESET high when pulled ≤0.3×VCC for ≥100 ns. |
| 3 (GND) | Ground reference | Return path for all internal circuitry and RESET output sink current. |
| 4 (RESET) | Active-high reset output | Push-pull output drives high (≥0.8×VCC) or low (≤0.4 V) with 800 µA source / 3.2 mA sink capability. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.25 V threshold | ±1.5% tolerance over full temperature range ensures deterministic reset behavior in 2.25 V systems without margining. |
| 200 ms fixed reset timeout | Guaranteed minimum delay prevents premature MCU release during slow-rising or noisy power rails. |
| Push-pull active-high RESET | Eliminates external pull-up, reduces BOM count, and improves noise immunity vs. open-drain alternatives. |
| Manual reset input (MR) | Supports field-initiated system recovery via button or host-controlled GPIO without power cycle. |
| Low 30 µA supply current | Enables continuous supervision in battery-backed or energy-harvesting applications with multi-year runtime. |
Applications
| Industrial PLC I/O Module | Portable Medical Monitor |
|---|---|
Use Scenario: Power sequencing during cold start and brownout recovery in DIN-rail mounted programmable logic controller modules. IC Role / Device Role / Timing Role: Supervisor asserts active-high RESET to hold ARM Cortex-M4 core in reset until 2.25 V rail stabilizes and remains asserted for ≥240 ms. Use Value: Prevents firmware corruption by guaranteeing full clock stabilization and memory initialization before code execution begins. |
Use Scenario: Battery-powered handheld ECG device requiring fail-safe boot under fluctuating Li-ion voltage (3.0–4.2 V). IC Role / Device Role / Timing Role: Monitors regulated 2.25 V analog front-end supply; triggers reset on discharge-induced sag below threshold. Use Value: Maintains clinical data integrity by blocking ADC sampling and Bluetooth transmission until stable bias is confirmed. |
| Automotive Body Control Unit | Smart Energy Meter |
Use Scenario: Supervision of 2.25 V microcontroller supply in junction box electronics exposed to load-dump transients. IC Role / Device Role / Timing Role: Detects undervoltage events during alternator failure; uses MR pin for diagnostic reset via CAN command. Use Value: Enables controlled safe shutdown and nonvolatile fault logging before power loss, meeting ISO 16750-2 requirements. |
Use Scenario: Tamper-resistant meter with real-time clock and secure bootloader requiring deterministic reset on capacitor discharge. IC Role / Device Role / Timing Role: Provides 200 ms reset pulse synchronized to backup supercapacitor decay profile. Use Value: Ensures cryptographic key reload completes before RTC registers lose coherence during mains interruption. |
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 | 2.5 V fixed threshold, 140 ms reset timeout, SOT23-3 package, no MR input. | Lacks manual reset and has higher threshold; unsuitable for 2.25 V systems or field-recovery use cases. | Select only if 2.5 V rail supervision suffices and board space permits SOT23-3 instead of SOT143. |
| TPS3808G12QDBVRQ1 | Adjustable threshold (via external resistor), 200 ms timeout, automotive-grade AEC-Q100, SOT23-6. | Requires external components for 2.25 V setting; larger package and higher cost; overqualified for commercial industrial use. | Prefer only for automotive production where AEC-Q100 qualification and design flexibility outweigh cost and size penalties. |
Compared with MAX809SEUR+T and TPS3808G12QDBVRQ1, the APX812-23UG-7 delivers exact 2.25 V threshold matching, integrated MR functionality in minimal SOT143 footprint, and optimized cost-performance balance for commercial/industrial 2.25 V microcontroller supervision.
Availability
APX812-23UG-7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, and smart energy meters requiring stable component supply with guaranteed long-term sourcing.
Supply support for APX812-23UG-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 and consumer markets.
The APX812 belongs to Diodes' microprocessor supervisor product line, engineered for precise voltage monitoring and deterministic reset generation in space-constrained, temperature-varying embedded systems.
FAQ
What is the exact reset threshold voltage and its tolerance for APX812-23UG-7?
The APX812-23UG-7 has a nominal reset threshold of 2.25 V with ±1.5% tolerance at 25°C, and maintains this accuracy across –40°C to +85°C per datasheet DS31960 Rev. 2. This is confirmed by electrical characteristics table on page 4, where Vth min/typ/max values are 2.22 V / 2.25 V / 2.28 V.
Does APX812-23UG-7 require an external pull-up resistor on the RESET pin?
No - the APX812-23UG-7 features a push-pull output that actively drives RESET high or low. However, a 100 kΩ pull-up to VCC is recommended if RESET must remain valid when VCC drops below 1.0 V, as the output enters high-impedance state below that voltage.
Can the manual reset (MR) pin be left unconnected in normal operation?
Yes - the MR pin is internally pulled up and can be left floating or tied to VCC for normal operation. It only requires connection to ground (via switch or GPIO) when manual system reset is needed. The datasheet specifies MR is active-low with no external pull required.
What is the maximum supply voltage and absolute maximum rating for VCC?
The APX812-23UG-7 operates up to 5.5 V per Recommended Operating Conditions (page 4), and its Absolute Maximum Rating for VCC is –0.3 V to +7.0 V. Exceeding 5.5 V continuously may cause parametric shift or reliability degradation, though short transients up to 7 V are survivable.
APX812-23UG-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:
- 2.25V
- 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
APX812-23UG-7 FAQ
1.How can I place an order for APX812-23UG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX812-23UG-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 APX812-23UG-7 reliable?
The price and inventory of APX812-23UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX812-23UG-7 is usually 5 days.
3.What payment methods are accepted for APX812-23UG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX812-23UG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX812-23UG-7?
APX812-23UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX812-23UG-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 APX812-23UG-7?
For technical support, including APX812-23UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX812-23UG-7 requirements.
6.How does Aetrix verify that APX812-23UG-7 is sourced from the original manufacturer or authorized distributors?
All APX812-23UG-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 APX812-23UG-7 meets industry standards.
7.What is the process for return or replacement of APX812-23UG-7?
All APX812-23UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX812-23UG-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 APX812-23UG-7 part is unused and in its original packaging.
Return procedure for APX812-23UG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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