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Texas Instruments TL7757ILPR
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- Part No.:
- TL7757ILPR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL7757ILPR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
TL7757ILPR from Texas Instruments is a precision supply-voltage supervisor IC designed for microcomputer and microprocessor systems. It monitors VCC for undervoltage conditions, asserts active-low RESET below 4.55 V ±120 mV threshold, features 20 µA standby current, 20 mA output sink capability, and operates across −40°C to +85°C. It ensures reliable power-on reset generation in embedded control and industrial instrumentation.
For engineers reviewing the TL7757ILPR datasheet, TL7757ILPR pinout, TL7757ILPR application, or TL7757ILPR equivalent, this page delivers verified technical context, exact pin functions for TO-92 (LP) package, real-world timing behavior (tPHL ≤ 5 µs), hysteresis-enabled noise immunity, and validated alternatives for automotive-grade voltage monitoring designs.
Technical Context
The TL7757ILPR implements a comparator-based precision voltage detection circuit with built-in hysteresis (30–70 mV) to prevent oscillatory resets during slow or noisy VCC transitions. Its internal reference and threshold network enables accurate negative-going detection at VIT− = 4.55 V ±120 mV over full temperature range.
RESET output is open-drain compatible, sinking up to 20 mA at VCC ≥ 4.3 V, with VOL ≤ 0.8 V. The device activates RESET when VCC drops below threshold and maintains it until VCC rises above VIT+, ensuring clean system initialization after brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 4.55 V ±120 mV - precise undervoltage detection point for 5 V nominal rails |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial and automotive under-hood environments |
| Standby Current | 20 µA max - enables low-power operation in battery-backed or energy-sensitive systems |
| Output Sink Current | 20 mA - drives standard logic inputs and RC reset networks without external buffer |
| Hysteresis | 30–70 mV - suppresses false triggering from supply ripple or transient noise |
| Reset Propagation Delay | tPHL ≤ 5 µs - ensures timely assertion of reset signal during fast voltage collapse |
| Power-Up Reset Activation | Vres ≤ 1.2 V - guarantees RESET remains active until VCC stabilizes above functional minimum |
Pinout & Package
TL7757ILPR uses the TO-92 (LP) through-hole package (3-pin, straight or formed leads), with pin 1 = GND, pin 2 = VCC, pin 3 = RESET (open-drain output). The tab is electrically connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | GND | Ground reference for internal comparator and output stage; electrically tied to metal tab |
| Pin 2 | VCC | Supply input (1 V to 7 V); powers internal circuitry and defines detection threshold reference |
| Pin 3 | RESET | Active-low open-drain output; sinks current to assert system reset when VCC < VIT− |
Key Features
| Feature | Design Value |
|---|---|
| Precision Threshold Detection | 4.55 V ±120 mV over −40°C to +85°C - eliminates need for external resistor divider calibration |
| Low Quiescent Current | 20 µA max - extends battery life in always-on supervisory applications |
| Robust Output Drive | 20 mA sink capability - directly interfaces with 74HC, 74LV, and microcontroller reset inputs |
| Noise-Immune Hysteresis | 30–70 mV programmable window - prevents chatter during marginal supply conditions |
| Early Power-On Reset | Asserts RESET down to VCC = 1 V - guarantees controlled startup before logic becomes active |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5 V rail powering MCU, CAN transceiver, and I/O drivers in harsh factory-floor environment with wide ambient temperature swings and conducted EMI. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to hold MCU in reset until stable 5 V is confirmed post-power-up or brownout recovery. Use Value: Prevents undefined MCU state and peripheral misconfiguration by guaranteeing >100 ms reset pulse width during slow-ramp 5 V supplies. |
Use Scenario: Embedded in door module PCB to supervise 5 V supply feeding microcontroller and LIN transceiver, operating from −40°C cold crank to +85°C under-dash thermal stress. IC Role / Device Role / Timing Role: Precision threshold detector with hysteresis ensuring glitch-free reset assertion during alternator load dump transients. Use Value: Eliminates need for external RC timing network while maintaining compliance with ISO 16750-2 pulse 4a/b voltage dip requirements. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Supervises isolated 5 V DC/DC output powering safety-critical ARM Cortex-M4 MCU and motor driver gate logic in Class II medical equipment. IC Role / Device Role / Timing Role: Fail-safe voltage monitor that forces hardware reset on any sub-threshold event, independent of software watchdog. Use Value: Meets IEC 62304 SW safety Class C requirement for deterministic power-fail response within 5 µs latency. |
Use Scenario: Watches main 5 V rail derived from AC/DC converter in DIN-rail mounted meter with long-term field deployment and wide seasonal temperature variation. IC Role / Device Role / Timing Role: Low-current supervisor enabling >10-year battery-backed RTC operation during mains failure while retaining accurate voltage trip point. Use Value: 20 µA quiescent current minimizes backup battery drain; ±120 mV threshold tolerance ensures consistent reset behavior across 20-year product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3 V threshold; 1.8 µA IQ; SOT-23-6 package; requires external pull-up on RESET | Better suited for low-voltage 3.3 V systems; lacks direct 5 V compatibility | Select when optimizing for ultra-low IQ and 3.3 V rail supervision; not drop-in for TL7757ILPR's 4.55 V threshold or TO-92 footprint |
| MAX6326UR31+T | 3.08 V threshold; 1.6 µA IQ; SC70-3 package; push-pull RESET output | Designed for portable 3 V systems; no hysteresis adjustment; higher accuracy (±0.5%) but narrower temp range (−40°C to +85°C same) | Choose for space-constrained 3 V designs requiring push-pull output; not functionally equivalent for 5 V rail monitoring or TO-92 mounting |
Compared with TPS3808G33DBVR and MAX6326UR31+T, TL7757ILPR uniquely provides 4.55 V threshold accuracy, TO-92 through-hole robustness, and integrated hysteresis-making it optimal for legacy industrial 5 V systems where board-level reliability and mechanical stability outweigh ultra-low IQ demands.
Availability
TL7757ILPR is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL7757ILPR 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 high-reliability components for industrial, automotive, and communications markets.
The TL77xx family was engineered specifically for robust, cost-effective power-supply monitoring in microcontroller-based systems-emphasizing precision threshold accuracy, hysteresis stability, and wide-temperature operation without external components.
FAQ
What is the exact reset threshold voltage of TL7757ILPR and how does it vary with temperature?
The TL7757ILPR has a nominal negative-going input threshold voltage (VIT−) of 4.55 V with tolerance ±120 mV over its full operating range of −40°C to +85°C. Per datasheet Figure 10, VIT− drifts less than ±5 mV across this range, maintaining tight regulation critical for 5 V system integrity. This specification applies directly to TL7757ILPR and is validated per TI SLVS041I revision August 2003.
Does TL7757ILPR require an external pull-up resistor on the RESET pin?
Yes, TL7757ILPR features an open-drain RESET output and requires an external pull-up resistor to VCC or another logic supply. Typical values range from 4.7 kΩ to 10 kΩ. The device sinks up to 20 mA, so the resistor must be sized to ensure VOL ≤ 0.8 V at full load-verified in TL7757ILPR's electrical characteristics table for IOL = 20 mA.
Can TL7757ILPR operate reliably at VCC = 1.2 V?
No-TL7757ILPR asserts RESET when VCC falls below ~4.4 V and remains active until VCC exceeds ~4.6 V. Its functional operation begins only when VCC ≥ 1 V, but the reset function is defined solely around the 4.55 V threshold. Operation at 1.2 V violates the 4.55 V detection requirement and is outside intended use; TL7757ILPR is not a low-voltage supervisor.
What is the maximum allowable supply voltage for TL7757ILPR?
The absolute maximum supply voltage for TL7757ILPR is 20 V, as specified in the Absolute Maximum Ratings table. However, recommended operating conditions limit VCC to 7 V maximum. Exceeding 7 V risks parametric shift or accelerated aging; sustained operation above 7 V is not supported and voids reliability guarantees for TL7757ILPR.
Is TL7757ILPR pin-compatible with other devices in the TL77xx family?
TL7757ILPR shares identical TO-92 (LP) pinout (GND-VCC-RESET) with TL7757CLP, TL7757CLPR, TL7757ILP, and TL7757ILPR-enabling direct substitution within the same temperature grade. However, it is not pin-compatible with SOIC (D) or SOT-89 (PK) variants due to differing package footprints and terminal counts; TL7757ILPR requires TO-92-specific layout.
TL7757ILPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.55V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 5µs Maximum Propagation Delay
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TL7757ILPR FAQ
1.How can I place an order for TL7757ILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7757ILPR 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 TL7757ILPR reliable?
The price and inventory of TL7757ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7757ILPR is usually 5 days.
3.What payment methods are accepted for TL7757ILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7757ILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7757ILPR?
TL7757ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7757ILPR 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 TL7757ILPR?
For technical support, including TL7757ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7757ILPR requirements.
6.How does Aetrix verify that TL7757ILPR is sourced from the original manufacturer or authorized distributors?
All TL7757ILPR 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 TL7757ILPR meets industry standards.
7.What is the process for return or replacement of TL7757ILPR?
All TL7757ILPR units undergo pre-shipment inspection (PSI). If there is an issue with TL7757ILPR, 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 TL7757ILPR part is unused and in its original packaging.
Return procedure for TL7757ILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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