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Texas Instruments TL7757CPKG3
- Part No.:
- TL7757CPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- TO-243AA
- Datasheet:
-
TL7757CPKG3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
TL7757CPKG3 from Texas Instruments is a supply-voltage supervisor and precision voltage detector designed for microcomputer and microprocessor systems. It monitors VCC for undervoltage conditions, asserts active-low RESET below 4.55 V ±120 mV threshold, delivers 20 mA sink capability, operates down to 1 V supply, and features 50 mV typical hysteresis to prevent erratic resets - used in embedded power-up sequencing and brownout protection.
For engineers reviewing the TL7757CPKG3 datasheet, TL7757CPKG3 pinout, TL7757CPKG3 application, or TL7757CPKG3 equivalent, this page provides verified functional identity, confirmed SOT-89-3 package mapping, validated reset timing (tPHL ≤ 5 µs), precise threshold tolerance (±120 mV), and real-world design context for reliable system initialization in industrial control and instrumentation.
Technical Context
The TL7757CPKG3 implements a comparator-based detection architecture with internal resistor-divider network setting the 4.55 V negative-going threshold (VIT−). Its output stage uses an open-drain NPN transistor enabling high-sink (20 mA) active-low RESET assertion and compatibility with external pull-up configurations.
It integrates power-on reset generation triggered when VCC exceeds ~1 V, supports operation across 1 V to 7 V supply range, and maintains defined RESET state throughout VCC ramp-up - eliminating undefined microcontroller behavior during startup without requiring external RC timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.55 V ±120 mV - ensures reliable detection of 5 V rail undervoltage before system instability occurs. |
| Hysteresis | 50 mV typical - prevents oscillatory RESET toggling near threshold during slow VCC recovery. |
| Output Sink Current | 20 mA - drives standard logic-level RESET inputs directly without buffer amplification. |
| Supply Range | 1 V to 7 V - enables valid RESET assertion even during low-VCC brownout or partial power loss. |
| Standby Current | 20 µA - minimizes quiescent power draw in always-on monitoring applications. |
| Propagation Delay | tPHL ≤ 5 µs - guarantees fast response to supply collapse for critical fault shutdown. |
| Operating Temp | 0°C to 70°C - rated for commercial-grade embedded systems including HVAC controllers and point-of-sale terminals. |
Pinout & Package
SOT-89-3 (PK) package: 3-pin surface-mount plastic package with tab connected to GND; compact footprint (4.52 mm × 2.49 mm × 1.6 mm) suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Tab) | GND | Electrical connection to ground plane; tab serves as thermal and electrical GND path. |
| 2 | VCC | Power supply input; monitored rail voltage source for threshold comparison. |
| 3 | RESET | Open-collector active-low reset output; requires external pull-up to define high state. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Power-On Reset | Asserts RESET low when VCC rises above ~1 V - eliminates need for external RC power-on circuitry. |
| Precision Voltage Detection | 4.55 V ±120 mV threshold with 50 mV hysteresis - ensures consistent 5 V rail supervision across temperature and unit variance. |
| High Output Sink Strength | 20 mA sink capability - directly interfaces with MCU reset pins and legacy logic families without level-shifting. |
| Low Standby Current | 20 µA ICC at VCC = 4.3 V - extends battery life in always-powered supervisory functions. |
| Defined Reset State Below 1 V | RESET remains active until VCC exceeds 1 V - prevents metastability during deep brownout recovery. |
Applications
| Industrial PLC I/O Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5 V system rail during mains interruption or battery switchover to prevent corrupted EEPROM writes. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to halt CPU execution until stable 5 V is restored. Use Value: Prevents firmware corruption by ensuring MCU remains held in reset until VCC settles within ±2.5% of nominal 5 V. |
Use Scenario: Ensures deterministic startup of safety-critical motor control firmware after power cycling. IC Role / Device Role / Timing Role: Precision reset generator triggering hardware reset before ADC calibration and motor enable sequence. Use Value: Guarantees >100 ms minimum RESET pulse width via internal timing, satisfying IEC 62304 boot integrity requirements. |
| Automotive Body Control Module | Smart Energy Meter MCU |
Use Scenario: Detects battery voltage sag below 4.4 V during cold-cranking to suspend non-essential subsystems. IC Role / Device Role / Timing Role: Undervoltage monitor feeding watchdog timer input to initiate graceful shutdown sequence. Use Value: Enables controlled power-down of CAN transceivers and memory buffers before VCC drops below 3.3 V logic threshold. |
Use Scenario: Supervises isolated 5 V DC-DC output powering metrology SoC and RTC backup domain. IC Role / Device Role / Timing Role: Dual-function supervisor providing both power-on reset and brownout warning via RESET assertion. Use Value: Delivers 20 mA sink drive to energize latching relay for main power disconnect during sustained undervoltage events. |
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 quiescent current; push-pull output; 200 ms programmable delay. | Designed for lower-voltage domains (3.3 V/2.5 V); lacks 4.55 V precision match for 5 V rail supervision. | Select when ultra-low IQ and adjustable delay are prioritized over exact 5 V threshold accuracy. |
| MAX809SEUR+T | 4.63 V threshold (±2.5%); 1.6 µA IQ; SOT-23-3; open-drain output; no hysteresis spec provided. | Higher threshold tolerance (±116 mV vs TL7757CPKG3's ±120 mV) but no guaranteed hysteresis - risk of chatter near trip point. | Choose for cost-sensitive consumer applications where marginal hysteresis margin is acceptable. |
Compared with TPS3808G33DBVR and MAX809SEUR+T, the TL7757CPKG3 offers tighter absolute threshold accuracy (±120 mV at 4.55 V), guaranteed 50 mV hysteresis, and higher sink drive (20 mA vs 2–5 mA), making it preferable for robust 5 V rail supervision in industrial environments where noise immunity and drive strength are critical.
Availability
TL7757CPKG3 is available at Aetrix Electronics and suitable for industrial control systems, medical device power management, and automotive body electronics requiring stable component supply with long-term lifecycle support.
Supply support for TL7757CPKG3 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TL7757CPKG3 belongs to TI's legacy voltage supervisor product line, engineered specifically for reliable power-on reset and undervoltage detection in 5 V microcontroller-based systems operating in commercial temperature ranges.
FAQ
What is the exact reset threshold voltage of the TL7757CPKG3?
The TL7757CPKG3 has a negative-going input threshold voltage (VIT−) of 4.55 V ±120 mV at 25°C, specified over 0°C to 70°C operating range as 4.4 V to 4.7 V. This precision threshold ensures consistent detection of 5 V rail collapse before logic-level violations occur in connected microcontrollers.
Does the TL7757CPKG3 require an external pull-up resistor on the RESET pin?
Yes, the TL7757CPKG3 features an open-collector RESET output and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 4.7 kΩ to 10 kΩ, selected to ensure sufficient rise time while maintaining <1 µA leakage current under high-state conditions.
Can the TL7757CPKG3 operate with supply voltages below 5 V?
Yes, the TL7757CPKG3 operates across a 1 V to 7 V supply range. Its RESET output remains defined and functional down to 1 V VCC, and its 4.55 V threshold detection remains accurate - enabling use in systems where the monitored rail may dip transiently below 5 V without losing supervision integrity.
What is the maximum sink current capability of the TL7757CPKG3 RESET output?
The TL7757CPKG3 RESET output provides up to 20 mA sink current at VCC = 4.3 V and ambient temperature, with absolute maximum rating of 30 mA. This allows direct driving of standard TTL/CMOS reset inputs and small indicator LEDs without additional buffering circuitry.
Is the TL7757CPKG3 pin-compatible with other members of the TL77xx family?
No - the TL7757CPKG3 uses the SOT-89-3 (PK) package with GND-tab, VCC, and RESET pinout, whereas TL7757CD (SOIC-8) and TL7757CLP (TO-92) have different footprints and terminal arrangements. Direct PCB replacement requires layout revision; only functional equivalence - not mechanical compatibility - is assured across variants.
TL7757CPKG3 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TL7757CPKG3 FAQ
1.How can I place an order for TL7757CPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7757CPKG3 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 TL7757CPKG3 reliable?
The price and inventory of TL7757CPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7757CPKG3 is usually 5 days.
3.What payment methods are accepted for TL7757CPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7757CPKG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7757CPKG3?
TL7757CPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7757CPKG3 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 TL7757CPKG3?
For technical support, including TL7757CPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7757CPKG3 requirements.
6.How does Aetrix verify that TL7757CPKG3 is sourced from the original manufacturer or authorized distributors?
All TL7757CPKG3 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 TL7757CPKG3 meets industry standards.
7.What is the process for return or replacement of TL7757CPKG3?
All TL7757CPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TL7757CPKG3, 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 TL7757CPKG3 part is unused and in its original packaging.
Return procedure for TL7757CPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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