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Diodes Incorporated APX812-40UG-7
- Part No.:
- APX812-40UG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
APX812-40UG-7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143
- Quantity:
- Payment:
- Shipping:
Inventory:4,029
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Product details
Overview
APX812-40UG-7 from Diodes Incorporated is a 4-pin microprocessor supervisor IC with manual reset input and active-high push-pull RESET output, designed for precise 4.00 V supply monitoring in industrial systems. It features a fixed 200 ms power-on reset timeout, operates across –40°C to +85°C, consumes only 40 µA typical supply current at 25°C, and is housed in a RoHS-compliant SOT143 package.
For engineers reviewing the APX812-40UG-7 datasheet, APX812-40UG-7 pinout, APX812-40UG-7 application, or APX812-40UG-7 equivalent, key selection criteria include reset threshold accuracy (±0.03 V at 25°C), MR input timing compatibility (100 ns minimum pulse width), guaranteed RESET validity down to VCC = 1.0 V, and SOT143 thermal resistance (θJA = 240°C/W).
Technical Context
The APX812-40UG-7 implements a precision bandgap-based voltage reference (VREF) feeding a comparator that triggers reset when VCC falls below 4.00 V ±3%. Its internal delay circuit ensures a minimum 240 ms RESET assertion after VCC recovers above threshold, independent of supply ramp rate.
It uses a push-pull output stage capable of sourcing 800 µA (VOH ≥ 0.8×VCC) and sinking 3.2 mA (VOL ≤ 0.4 V), with MR input compatible with standard CMOS logic levels (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC) and ESD robustness rated at 3 kV HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00 V ±0.03 V at 25°C; ensures reliable detection of 4.0 V supply brownout without false triggering near nominal rail |
| Reset Timeout | 200 ms typ. (140–280 ms); guarantees MCU reset hold time sufficient for full processor initialization |
| Supply Current | 40 µA typ. at 25°C; enables low-power operation in battery-backed or energy-sensitive embedded systems |
| Operating Temp | –40°C to +85°C; supports deployment in industrial control, automotive under-hood, and outdoor equipment |
| Output Type | Active-high push-pull; eliminates need for external pull-up resistor and ensures fast, rail-to-rail RESET transitions |
| MR Input Pulse | ≥100 ns minimum width; accommodates mechanical switch bounce and digital debouncing circuits |
| ESD Rating | 3 kV HBM; provides robust handling during PCB assembly and field service without additional protection |
Pinout & Package
APX812-40UG-7 is packaged in a lead-free, green-compliant SOT143 (4-pin, 1.4 mm × 2.5 mm × 1.0 mm) surface-mount package with exposed pad thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Top View) | VCC | Positive supply input; powers internal circuitry and defines reset threshold reference point |
| 2 | MR | Manual reset input (active-low); asserts RESET when pulled ≤0.3×VCC, compatible with open-drain or push-button interfaces |
| 3 | GND | Ground reference; must be connected directly to system ground plane for stable threshold and noise immunity |
| 4 | RESET | Active-high push-pull output; drives high (≥0.8×VCC) when VCC > 4.03 V and timer expired, low (≤0.4 V) otherwise |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.00 V threshold | ±0.03 V tolerance at 25°C ensures deterministic reset behavior across 4.0 V systems without margining overhead |
| Guaranteed RESET validity down to VCC = 1.0 V | Enables predictable reset assertion even during deep brownout, eliminating undetermined logic states on MCU reset pin |
| Push-pull active-high output | Eliminates external pull-up resistor, reduces BOM count, and improves rise/fall time vs. open-drain alternatives |
| Full temperature specification | All parameters-including threshold, delay, and supply current-guaranteed over –40°C to +85°C industrial range |
| SOT143 green package | Halogen-free, RoHS-compliant molding compound meets environmental compliance requirements for global industrial shipments |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Power sequencing and brownout recovery in programmable logic controllers operating from 4.0 V auxiliary rails. IC Role / Device Role / Timing Role: Monitors 4.0 V VCC and asserts active-high RESET to halt CPU execution until stable supply is confirmed. Use Value: Prevents firmware corruption during line transients by guaranteeing ≥240 ms reset hold time after VCC recovery. |
Use Scenario: Supervision of 4.0 V microcontroller supply in door module ECUs exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Detects supply dips below 4.00 V and generates manual-reset-compatible RESET signal for safe state restoration. Use Value: Enables reliable restart after battery voltage sag using MR input tied to vehicle wake-up interrupt line. |
| Medical Diagnostic Handhelds | Smart Energy Meters |
|
Use Scenario: Battery-backed 4.0 V logic rail supervision in portable ultrasound or glucose monitor devices. IC Role / Device Role / Timing Role: Provides low-quiescent-current (40 µA) reset generation with minimal impact on standby battery life. Use Value: Extends operational runtime between charges while maintaining deterministic reset behavior across temperature extremes. |
Use Scenario: Monitoring isolated 4.0 V DC-DC output powering metrology SoC in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Ensures meter firmware initializes correctly after power interruption or grid disturbance events. Use Value: Meets IEC 62056-21 reset timing requirements via guaranteed 200 ms timeout and ±0.03 V threshold accuracy. |
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 | 4.00 V threshold, active-low output, SOT23-3 package, 1.6 µA max quiescent current | Requires external pull-up for active-high logic; lacks manual reset input | Select when ultra-low power (<2 µA) is critical and MR functionality is unnecessary |
| TPS3808G33DBVR | 3.3 V threshold, adjustable delay (0–10 s), active-high output, SOT23-6 package, 16 µA typical ICC | Fixed 3.3 V threshold incompatible with 4.0 V systems; requires external capacitor for delay tuning | Choose only if system redesign permits 3.3 V rail supervision and programmable timeout is required |
Compared with MAX809SEUR+T and TPS3808G33DBVR, APX812-40UG-7 uniquely delivers factory-trimmed 4.00 V accuracy, integrated manual reset, and SOT143 space efficiency-making it optimal for compact 4.0 V industrial designs where pin count, threshold match, and MR support are mandatory.
Availability
APX812-40UG-7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for APX812-40UG-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 automotive markets.
The APX811/812 series was developed specifically for cost-sensitive, space-constrained microprocessor supervision in 2.5 V–5.0 V systems requiring precision reset thresholds and manual reset capability across extended temperature ranges.
FAQ
What is the exact reset threshold voltage for APX812-40UG-7?
The APX812-40UG-7 has a factory-trimmed reset threshold of 4.00 V with ±0.03 V tolerance at 25°C, and maintains ±0.06 V variation over the full –40°C to +85°C operating range per datasheet DS31960 Rev. 2 page 4.
Can APX812-40UG-7 drive a 10 kΩ pull-down load on its RESET pin?
No-APX812-40UG-7 has an active-high push-pull output optimized to source up to 800 µA (VOH ≥ 0.8×VCC) and sink up to 3.2 mA (VOL ≤ 0.4 V). A 10 kΩ pull-down would force RESET low during normal operation; use only with high-impedance MCU inputs or optional 100 kΩ pull-up for sub-1 V VCC validity.
Does APX812-40UG-7 require an external capacitor for reset timing?
No. The 200 ms reset timeout is generated by an internal RC timer; no external capacitor is needed. This simplifies layout, improves reliability, and eliminates capacitor aging or temperature drift effects on reset duration.
Is APX812-40UG-7 qualified for automotive AEC-Q100?
No. APX812-40UG-7 is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. For automotive applications, Diodes Incorporated offers the pin-compatible APX812Q series with AEC-Q100 Grade 2 qualification and extended temperature testing.
APX812-40UG-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:
- 4V
- 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
APX812-40UG-7 FAQ
1.How can I place an order for APX812-40UG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for APX812-40UG-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 APX812-40UG-7 reliable?
The price and inventory of APX812-40UG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APX812-40UG-7 is usually 5 days.
3.What payment methods are accepted for APX812-40UG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APX812-40UG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APX812-40UG-7?
APX812-40UG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APX812-40UG-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 APX812-40UG-7?
For technical support, including APX812-40UG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APX812-40UG-7 requirements.
6.How does Aetrix verify that APX812-40UG-7 is sourced from the original manufacturer or authorized distributors?
All APX812-40UG-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 APX812-40UG-7 meets industry standards.
7.What is the process for return or replacement of APX812-40UG-7?
All APX812-40UG-7 units undergo pre-shipment inspection (PSI). If there is an issue with APX812-40UG-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 APX812-40UG-7 part is unused and in its original packaging.
Return procedure for APX812-40UG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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