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Texas Instruments TL7757IPK
- Part No.:
- TL7757IPK
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-243AA
- Datasheet:
-
TL7757IPK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:966
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Product details
Overview
TL7757IPK from Texas Instruments is a precision supply-voltage supervisor IC designed for undervoltage monitoring in microcomputer and microprocessor systems. It features a 4.55 V ±120 mV threshold, 20 µA standby current, RESET output active low below threshold, defined operation down to VCC = 1 V, and 20 mA sink capability - enabling reliable power-on reset generation in industrial control and embedded instrumentation.
For engineers reviewing the TL7757IPK datasheet, TL7757IPK pinout, TL7757IPK application, or TL7757IPK equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The TL7757IPK implements a comparator-based voltage detection architecture with built-in hysteresis (30–70 mV) to prevent erratic resets during supply transients. Its internal circuitry generates an active-low RESET signal when VCC drops below the negative-going threshold (VIT− = 4.4–4.7 V) and maintains reset until VCC recovers above VIT+.
It operates across −40°C to +85°C, supports supply voltages from 1 V to 7 V, and guarantees low-level output voltage ≤0.8 V at 20 mA sink load. The device requires no external components for basic reset functionality and defines RESET state even during brown-out conditions near 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Threshold Voltage | 4.55 V ±120 mV - precise undervoltage detection point for 5 V systems with margin against noise-induced false triggers |
| Standby Current | 20 µA max - enables battery-backed or low-power embedded systems to maintain supervision without significant drain |
| Output Sink Capability | 20 mA - directly drives standard logic inputs or small MOSFET gates without external buffer |
| Hysteresis | 30–70 mV - ensures clean, bounce-free reset assertion/deassertion during slow or noisy VCC ramps |
| Reset Activation Voltage | ≤1.2 V - guarantees defined RESET behavior during power-up from very low VCC, preventing undefined MCU states |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade environments including motor controls and remote sensors |
| Propagation Delay | 2–5 µs - fast response to supply faults, supporting real-time system recovery requirements |
Pinout & Package
SOT-89 (PK) 3-pin surface-mount package with tab connected to GND; compact footprint (4.91 mm × 4.52 mm × 1.9 mm), moisture sensitivity level 2, lead finish Sn, suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Tab) | GND | Electrical connection to ground plane; tab provides thermal conduction path and mechanical anchoring |
| 2 | VCC | Supply input pin - monitors system rail; device operates from 1 V to 7 V with internal regulation |
| 3 | RESET | Active-low open-drain output - sinks up to 20 mA; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Precision threshold tolerance | ±120 mV at 4.55 V - tighter than typical ±2% supervisors, reducing need for external trimming in 5 V applications |
| Low-VCC reset definition | RESET active when VCC ≥ 1 V - eliminates undefined startup states in systems with slow-ramping supplies or backup batteries |
| Comparator hysteresis | 30–70 mV - suppresses oscillation during marginal supply conditions, improving system robustness |
| High sink current | 20 mA - supports direct interface to TTL/CMOS inputs or gate drivers without series resistors or buffers |
| Industrial temperature range | −40°C to +85°C - validated performance across full range, eliminating derating concerns in harsh environments |
Applications
| Industrial PLC I/O Module | Smart Sensor Node |
|---|---|
Use Scenario: Power rail supervision during cold-start and brown-out events in programmable logic controller field modules. IC Role / Device Role / Timing Role: Voltage supervisor generating hardware reset signal to ARM Cortex-M4 MCU upon VCC drop below 4.43 V. Use Value: Prevents firmware lockup or register corruption by ensuring deterministic reset before supply falls into invalid operating region. |
Use Scenario: Battery-powered environmental sensor transmitting data over LoRaWAN with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor asserting RESET during battery voltage sag below 4.55 V threshold. Use Value: Enables graceful shutdown and nonvolatile state save before brown-out, preserving calibration and event logs. |
| Motor Drive Control Board | Medical Diagnostic Handheld |
Use Scenario: Monitoring 5 V auxiliary supply feeding isolated gate drivers and position feedback circuits. IC Role / Device Role / Timing Role: Precision voltage detector triggering immediate disable of PWM outputs via MCU interrupt on RESET assertion. Use Value: Mitigates risk of shoot-through or uncontrolled motion by enforcing safe shutdown within 5 µs of fault detection. |
Use Scenario: Supervising main 3.3 V rail powering ADC, display controller, and wireless SoC in portable diagnostic tool. IC Role / Device Role / Timing Role: Reset generator ensuring processor remains held in reset until stable 3.3 V is confirmed post-battery insertion. Use Value: Eliminates boot failures caused by insufficient ramp time or contact bounce during battery replacement. |
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; 350 nA quiescent current; push-pull output; requires external capacitor for delay adjustment | Optimized for ultra-low-power 3.3 V systems; lacks hysteresis tuning; not pin-compatible | Select when lowest possible current draw and precise reset timing control are required, and 3.3 V threshold matches system rail |
| MAX809SEUR+T | 4.63 V threshold (±1.5%); 12 µA quiescent current; SOT-23-3 package; no hysteresis spec beyond 100 mV min | Higher threshold tolerance; smaller footprint; lower max sink current (20 mA typ, not guaranteed min) | Choose for cost-sensitive consumer designs where ±1.5% threshold accuracy suffices and SOT-23 layout reuse is prioritized |
Compared with TL7757IPK, the TPS3808G33DBVR offers dramatically lower quiescent current but targets 3.3 V rails and lacks the TL7757IPK's guaranteed 20 mA sink and explicit hysteresis specification. The MAX809SEUR+T provides a smaller SOT-23 package and lower typical current, yet trades off guaranteed sink strength and tighter threshold tolerance.
Availability
TL7757IPK is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and smart sensor applications requiring stable component supply, long-term lifecycle support, and guaranteed performance across −40°C to +85°C.
Supply support for TL7757IPK 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 power management technologies, with decades of experience in high-reliability industrial and automotive ICs.
The TL77xx family was engineered specifically for robust power-supply monitoring in microcontroller-based systems, emphasizing precision threshold accuracy, wide temperature operation, and fail-safe reset behavior under marginal supply conditions.
FAQ
What is the exact reset threshold voltage of TL7757IPK?
The TL7757IPK has a nominal negative-going input threshold voltage (VIT−) of 4.55 V with a tolerance of ±120 mV, specified over −40°C to +85°C. At 25°C, the typical value is 4.55 V, ranging from 4.43 V (min) to 4.67 V (max). This threshold is factory-trimmed and does not require external calibration.
Does TL7757IPK require external components to function?
No, TL7757IPK operates autonomously with only VCC, GND, and RESET connections. It needs no external capacitors, resistors, or diodes for basic reset generation. An external pull-up resistor on the RESET pin is required only if a logic-high state must be asserted when not active - the output is open-drain.
What is the maximum sink current capability of TL7757IPK's RESET output?
The TL7757IPK RESET output guarantees 20 mA sink current capability at VCC = 4.3 V and TA = −40°C to +85°C, with VOL ≤ 0.8 V. This allows direct driving of standard logic inputs or small-signal MOSFET gates without additional buffering circuitry.
How does TL7757IPK behave during power-up when VCC rises slowly?
TL7757IPK asserts RESET (low) as soon as VCC reaches approximately 1 V and holds it active until VCC exceeds the positive-going threshold (VIT+ ≈ 4.65 V). Its hysteresis prevents chatter during slow ramps, and propagation delay remains ≤5 µs, ensuring deterministic startup sequencing for connected MCUs.
Is TL7757IPK pin-compatible with other packages in the TL7757 family?
No - TL7757IPK uses the 3-pin SOT-89 (PK) package with pinout GND–VCC–RESET, while SOIC-8 (D) and TO-92 (LP) variants have different pin counts and arrangements. The SOT-89 version shares identical electrical specifications with other TL7757I-grade parts but is not mechanically or electrically interchangeable with 8-pin or 3-pin TO-92 variants.
TL7757IPK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-243AA
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TL7757IPK FAQ
1.How can I place an order for TL7757IPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7757IPK 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 TL7757IPK reliable?
The price and inventory of TL7757IPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7757IPK is usually 5 days.
3.What payment methods are accepted for TL7757IPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7757IPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7757IPK?
TL7757IPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7757IPK 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 TL7757IPK?
For technical support, including TL7757IPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7757IPK requirements.
6.How does Aetrix verify that TL7757IPK is sourced from the original manufacturer or authorized distributors?
All TL7757IPK 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 TL7757IPK meets industry standards.
7.What is the process for return or replacement of TL7757IPK?
All TL7757IPK units undergo pre-shipment inspection (PSI). If there is an issue with TL7757IPK, 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 TL7757IPK part is unused and in its original packaging.
Return procedure for TL7757IPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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