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Texas Instruments LP3470IM5X-2.93/NOPB
- Part No.:
- LP3470IM5X-2.93/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3470IM5X-2.93/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP3470IM5X-2.93/NOPB from Texas Instruments is a micropower voltage supervisor IC with 2.93 V ±1% reset threshold, programmable reset timeout via external capacitor (tRP = 2000 × C1), open-drain active-low reset output, and operation down to VCC = 0.5 V. It monitors microprocessor supply rails in battery-powered systems to ensure reliable power-on-reset and brownout recovery.
For engineers reviewing the LP3470IM5X-2.93/NOPB datasheet, LP3470IM5X-2.93/NOPB pinout, LP3470IM5X-2.93/NOPB application, or LP3470IM5X-2.93/NOPB equivalent, this page delivers verified specifications, SOT-23-5 pin mapping, real-world timing behavior, and validated alternative options for critical µP supervision in portable and industrial embedded designs.
Technical Context
The LP3470IM5X-2.93/NOPB implements a precision bandgap-based voltage reference with hysteresis (VHYST = 15–65 mV) and a comparator-driven open-drain output stage. Its reset assertion logic includes built-in immunity to sub-100 ns VCC transients and guarantees valid reset signaling even during deep undervoltage conditions (VCC ≥ 0.5 V).
Reset timeout is fully external-programmable via capacitor on SRT pin (e.g., 1 nF → 2 ms tRP), while quiescent current remains fixed at 16 µA typical across –40°C to 85°C. The device requires no internal oscillator or trimming circuitry-timing and threshold accuracy derive solely from passive component selection and factory-laser-trimmed reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±1% over –40°C to 85°C - ensures precise POR activation without margin loss in 3.3 V rail monitoring. |
| Quiescent Current | 16 µA typical at 4.5 V - enables multi-year battery life in always-on supervision circuits. |
| Minimum Operating VCC | 0.5 V - guarantees reset validity during deep brownout or backup-supply handover. |
| Reset Output Type | Open-drain, active-low - allows wired-OR configuration and flexible pullup to any logic rail (0.68–68 kΩ). |
| Reset Timeout Range | 1–3.5 ms (with C1 = 1 nF) - programmable up to seconds via larger capacitor (tRP = 2000 × C1, C1 in µF). |
| VCC Transient Immunity | Immune to <100 ns negative glitches below VRTH - eliminates false resets from switching noise or ESD coupling. |
| Hysteresis Voltage | 15–65 mV - prevents chatter during slow-rising/falling VCC transitions near threshold. |
Pinout & Package
LP3470IM5X-2.93/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, with JEDEC-standard footprint and RoHS-compliant Sn lead finish. Pin 1 orientation is quadrant Q3 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Reset timeout programming input | Connect external capacitor to GND; sets tRP = 2000 × C1 (C1 in µF, tRP in ms). Floating = minimal delay. |
| 2 - GND | Ground reference | Primary return path for internal reference and comparator; must be low-impedance connection to system ground plane. |
| 3 - VCC1 | Internal supply tie | Must be shorted directly to VCC (Pin 4); not an independent input - internal bias node for reference generation. |
| 4 - VCC | Supply voltage & monitor input | Monitored rail input; powers device and triggers reset when falling below 2.93 V; functional down to 0.5 V. |
| 5 - Reset | Open-drain reset output | Active-low signal; requires external pullup (20 kΩ typical); sinks ≤4 mA; valid logic low for VCC ≥ 0.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% reset threshold accuracy | Eliminates need for external calibration or margin padding in 3.3 V system POR design. |
| Programmable reset timeout | Enables precise match to µP reset hold time requirements without custom ASIC or firmware intervention. |
| 0.5 V minimum VCC operation | Supports seamless handover between main and backup supplies (e.g., coin cell) without reset loss. |
| 16 µA quiescent current | Reduces standby power by >90% vs. legacy bipolar supervisors, critical for IoT endpoint longevity. |
| Open-drain output with wide pullup range | Permits interoperability with 1.8 V, 3.3 V, or 5 V logic domains using single external resistor. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable glucose monitor operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.3 V LDO output; asserts reset if battery sags below 2.93 V during RF burst, holding µC in reset until stable supply returns. Use Value: Prevents corrupted sensor readings or failed BLE handshakes during voltage droop, extending usable battery life by avoiding spurious reboots. |
Use Scenario: DIN-rail mounted analog input module exposed to 24 V DC field wiring with surge risk. IC Role / Device Role / Timing Role: Monitors isolated 5 V logic supply; detects brownout from induced transients on 24 V bus and holds controller in reset for 200 ms after recovery. Use Value: Ensures deterministic state recovery after EFT events, eliminating firmware lockups that require manual power cycle. |
| Smart Meter Data Loggers | Automotive Body Control Units |
|
Use Scenario: AMI meter storing hourly consumption data to FRAM during mains outage using supercap backup. IC Role / Device Role / Timing Role: Tracks 3.3 V backup rail; triggers reset when supercap voltage falls below 2.93 V, halting writes until safe shutdown sequence completes. Use Value: Guarantees FRAM write integrity by preventing partial writes during final voltage decay phase. |
Use Scenario: BCM managing door locks, lighting, and CAN gateway with 12 V battery input subject to load dump. IC Role / Device Role / Timing Role: Supervises 5 V MCU supply; ignores <100 ns transients from alternator ripple but asserts reset on sustained undervoltage during cranking. Use Value: Maintains functional safety compliance (ISO 26262 ASIL-B) by ensuring deterministic reset behavior under automotive electrical stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G125DBVR | Fixed 1.25 V threshold; 360 ms factory-programmed timeout; 2.5 µA IQ | Not suitable for 2.93 V rail monitoring; requires different PCB layout due to non-programmable timing. | Select only if system uses 1.25 V reference rail and fixed delay suffices. |
| MAX6326UT29D3+T | 2.93 V threshold; 140 ms fixed timeout; 1.6 µA IQ; push-pull output | Lacks external timeout adjustment; push-pull output eliminates need for pullup but limits voltage domain flexibility. | Choose when ultra-low IQ dominates design priority and timing is fixed across production units. |
Compared with LP3470IM5X-2.93/NOPB, TPS3808G125DBVR offers lower IQ but cannot supervise 2.93 V rails, while MAX6326UT29D3+T matches the threshold and reduces IQ further but sacrifices programmable delay and open-drain versatility-making LP3470IM5X-2.93/NOPB optimal for adaptable, rail-specific µP reset control.
Availability
LP3470IM5X-2.93/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and automotive body control units requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LP3470IM5X-2.93/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-reliability power management and supervisory ICs.
The LP3470 family was designed specifically for micropower, precision voltage supervision in space-constrained, battery-sensitive applications-emphasizing threshold accuracy, ultra-low IQ, and external timing flexibility over integrated features.
FAQ
What is the exact reset threshold voltage of LP3470IM5X-2.93/NOPB?
The LP3470IM5X-2.93/NOPB has a factory-programmed reset threshold of 2.93 V with ±1% accuracy over the full operating temperature range (–40°C to 85°C). This value is laser-trimmed during production and specified in the Electrical Characteristics table under VRTH parameter. The device maintains this precision without external calibration or compensation components.
How do I calculate the reset timeout period for LP3470IM5X-2.93/NOPB?
The reset timeout period (tRP) for LP3470IM5X-2.93/NOPB is calculated using tRP (ms) = 2000 × C1, where C1 is the capacitance (in µF) connected between SRT (Pin 1) and GND. For example, a 100 nF capacitor yields tRP = 200 ms. The LP3470IM5X-2.93/NOPB datasheet confirms this linear relationship applies across the full operating temperature range.
Can LP3470IM5X-2.93/NOPB operate with a 1.8 V supply?
No - LP3470IM5X-2.93/NOPB requires VCC ≥ 0.5 V to assert a valid reset signal, but its 2.93 V reset threshold means it is intended for monitoring rails ≥2.93 V (e.g., 3.3 V systems). While it functions electrically down to 0.5 V, it will not trigger reset on a 1.8 V rail because the monitored voltage never reaches the 2.93 V threshold. Use a 1.8 V threshold variant (e.g., LP3470IM5X-1.80/NOPB) instead.
What is the recommended pullup resistor value for the Reset pin of LP3470IM5X-2.93/NOPB?
The recommended pullup resistor for the Reset pin of LP3470IM5X-2.93/NOPB is 20 kΩ, connected between Reset (Pin 5) and VCC. This value balances leakage current handling (R ≤ 68 kΩ) and output drive capability (R ≥ 680 Ω), ensuring clean logic-high levels while limiting sink current to <4 mA. The LP3470IM5X-2.93/NOPB datasheet specifies this as the typical design value across all operating conditions.
Does LP3470IM5X-2.93/NOPB require an external bypass capacitor?
Yes - a 0.1 µF ceramic bypass capacitor placed close to the VCC (Pin 4) and GND (Pin 2) pins is recommended to enhance immunity against high-frequency noise and transient coupling. The LP3470IM5X-2.93/NOPB datasheet explicitly states this improves rejection of negative-going VCC transients and stabilizes internal reference operation, especially in noisy industrial or automotive environments.
LP3470IM5X-2.93/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3470IM5X-2.93/NOPB FAQ
1.How can I place an order for LP3470IM5X-2.93/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3470IM5X-2.93/NOPB 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 LP3470IM5X-2.93/NOPB reliable?
The price and inventory of LP3470IM5X-2.93/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3470IM5X-2.93/NOPB is usually 5 days.
3.What payment methods are accepted for LP3470IM5X-2.93/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3470IM5X-2.93/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3470IM5X-2.93/NOPB?
LP3470IM5X-2.93/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3470IM5X-2.93/NOPB 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 LP3470IM5X-2.93/NOPB?
For technical support, including LP3470IM5X-2.93/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3470IM5X-2.93/NOPB requirements.
6.How does Aetrix verify that LP3470IM5X-2.93/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3470IM5X-2.93/NOPB 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 LP3470IM5X-2.93/NOPB meets industry standards.
7.What is the process for return or replacement of LP3470IM5X-2.93/NOPB?
All LP3470IM5X-2.93/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3470IM5X-2.93/NOPB, 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 LP3470IM5X-2.93/NOPB part is unused and in its original packaging.
Return procedure for LP3470IM5X-2.93/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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