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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Texas Instruments TL7733BCDE4

Name: TL7733BCDE4
Brand: Texas Instruments
SKU: TL7733BCDE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TL7733BCDE4

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TL7733BCDE4.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

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Product details

Overview

TL7733BCDE4 from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microprocessor and microcontroller systems. It monitors the SENSE input for undervoltage conditions, provides true/complement RESET outputs, features a 3.08 V nominal threshold (±0.05 V), operates from 3.6 V to 18 V supply, and supports externally adjustable reset pulse duration via CT capacitor. It is used in notebook computers to ensure reliable power-on and brownout reset sequencing.

For engineers reviewing the TL7733BCDE4 datasheet, TL7733BCDE4 pinout, TL7733BCDE4 application, or TL7733BCDE4 equivalent, key selection considerations include its 3.08 V trip point, SOIC-8 package, dual active-high/active-low reset outputs, temperature-compensated reference, and compatibility with 0°C to 70°C industrial operation.

Technical Context

The TL7733BCDE4 implements a precision voltage-sense comparator with hysteresis (10 mV) and an internal temperature-compensated 2.53 V reference. Its SENSE input detects supply drops below 3.08 V (typical), triggering simultaneous active-high RESET and active-low RESET outputs with propagation delays under 500 ns.

Reset pulse duration is user-defined via external CT capacitor (td ≈ 26 ms per µF), and RESIN allows manual reset override. The REF output delivers a stable 2.53 V reference (±0.05 V) for external circuitry, requiring a 0.1 µF decoupling capacitor.

Key Specifications

Parameter	Value and Actual Design Meaning
V_IT– Threshold	3.08 V nominal (3.03–3.13 V range); defines precise undervoltage detection point for 3.3 V rail monitoring
Hysteresis	10 mV; prevents chatter during slow supply recovery near trip point
Supply Range	3.6 V to 18 V; supports wide-input systems including 5 V, 12 V, and industrial rails
REF Output	2.53 V ±0.05 V; stable, temperature-compensated reference for external biasing or ADC reference
Operating Temp	0°C to 70°C; qualified for commercial/industrial ambient environments
Output Drive	RESET: 16 mA sink (V_OL ≤ 0.4 V); RESET: 16 mA source (V_OH ≥ V_CC – 1.5 V); enables direct interface to MCU reset pins
Propagation Delay	<500 ns (t_PLH/t_PHL); ensures fast, deterministic reset assertion on fault

Pinout & Package

TL7733BCDE4 is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard gull-wing leads and RoHS-compliant NiPdAu plating.

Pin/Terminal	Circuit Role	Design Meaning
1 (REF)	Reference voltage output	Provides stable 2.53 V reference; requires 0.1 µF bypass capacitor to GND for noise immunity
2 (RESIN)	Manual reset input	Active-low override: pulls RESET high / RESET low when asserted; VIH = 2 V, VIL = 0.8 V
3 (CT)	Timing capacitor connection	Sets reset pulse duration (td ≈ 26 ms/µF); internal current source charges CT to ~1.8 V
4 (GND)	Ground reference	Primary return path for all internal circuits and output drivers
5 (RESET)	Active-low reset output	Open-collector output; requires external pullup; sinks 16 mA at V_OL ≤ 0.4 V
6 (RESET)	Active-high reset output	Push-pull output; sources 16 mA at V_OH ≥ V_CC – 1.5 V; no external pullup needed
7 (SENSE)	Supply voltage monitor input	High-impedance input sensing V_CC or regulated rail; triggers reset when voltage falls below 3.08 V
8 (V_CC)	Power supply input	Accepts 3.6–18 V; powers internal circuitry and enables RESET output drive

Key Features

Feature	Design Value
Precision voltage sensing	3.08 V threshold with ±2.5% tolerance over temperature ensures accurate 3.3 V rail supervision
Dual complementary reset outputs	Simultaneous active-high and active-low signals eliminate need for external inverters in mixed-logic systems
Externally adjustable reset timeout	CT pin enables programmable delay (e.g., 2.6 ms with 0.1 µF) to guarantee full system reset completion
True power-on reset generation	RESET activates when V_CC ≥ 1 V, ensuring reset assertion before core logic becomes operational
Temperature-compensated reference	Internal 2.53 V reference maintains ±0.05 V stability from 0°C to 70°C, enabling reliable threshold accuracy

Applications

Industrial PLC Controllers	Notebook Power Management
Use Scenario: Monitoring 3.3 V I/O rail in programmable logic controllers subject to voltage sags during motor switching transients. IC Role / Device Role / Timing Role: Supervises SENSE input connected to 3.3 V rail; asserts RESET/RESET within 500 ns of undervoltage detection to halt CPU execution and prevent corrupted state. Use Value: 10 mV hysteresis prevents false resets during marginal recovery; REF output supplies stable bias to analog sensor front-end.	Use Scenario: Ensuring clean boot sequence in Intel Core-based notebooks where 3.3 V standby rail must stabilize before southbridge initialization. IC Role / Device Role / Timing Role: TL7733BCDE4 senses 3.3 V rail via SENSE; generates 2.6 ms reset pulse (0.1 µF CT) long enough to meet chipset t_RST requirements. Use Value: Dual RESET outputs directly drive both southbridge (active-low) and EC (active-high) reset inputs without level-shifting components.
Factory Automation Gateways	Network Attached Storage (NAS) Controllers
Use Scenario: Protecting ARM-based gateway SoCs in harsh factory environments where 5 V DC-DC converters experience load-induced dips. IC Role / Device Role / Timing Role: Monitors 5 V rail through resistive divider at SENSE; RESIN tied to watchdog timer output for fail-safe recovery. Use Value: Wide 3.6–18 V supply range accommodates 5 V input with margin; SOIC-8 footprint simplifies layout in space-constrained gateways.	Use Scenario: Supervising 3.3 V auxiliary rail powering SATA controller and USB hub in multi-bay NAS enclosures. IC Role / Device Role / Timing Role: TL7733BCDE4's 3.08 V threshold matches 3.3 V rail tolerance; REF output stabilizes voltage reference for thermal sensor ADC. Use Value: 2.53 V REF output eliminates need for separate voltage reference IC, reducing BOM count and board area.

Industrial PLC Controllers

Notebook Power Management

Use Scenario: Monitoring 3.3 V I/O rail in programmable logic controllers subject to voltage sags during motor switching transients.

IC Role / Device Role / Timing Role: Supervises SENSE input connected to 3.3 V rail; asserts RESET/RESET within 500 ns of undervoltage detection to halt CPU execution and prevent corrupted state.

Use Value: 10 mV hysteresis prevents false resets during marginal recovery; REF output supplies stable bias to analog sensor front-end.

Use Scenario: Ensuring clean boot sequence in Intel Core-based notebooks where 3.3 V standby rail must stabilize before southbridge initialization.

IC Role / Device Role / Timing Role: TL7733BCDE4 senses 3.3 V rail via SENSE; generates 2.6 ms reset pulse (0.1 µF CT) long enough to meet chipset t_RST requirements.

Use Value: Dual RESET outputs directly drive both southbridge (active-low) and EC (active-high) reset inputs without level-shifting components.

Factory Automation Gateways

Network Attached Storage (NAS) Controllers

Use Scenario: Protecting ARM-based gateway SoCs in harsh factory environments where 5 V DC-DC converters experience load-induced dips.

IC Role / Device Role / Timing Role: Monitors 5 V rail through resistive divider at SENSE; RESIN tied to watchdog timer output for fail-safe recovery.

Use Value: Wide 3.6–18 V supply range accommodates 5 V input with margin; SOIC-8 footprint simplifies layout in space-constrained gateways.

Use Scenario: Supervising 3.3 V auxiliary rail powering SATA controller and USB hub in multi-bay NAS enclosures.

IC Role / Device Role / Timing Role: TL7733BCDE4's 3.08 V threshold matches 3.3 V rail tolerance; REF output stabilizes voltage reference for thermal sensor ADC.

Use Value: 2.53 V REF output eliminates need for separate voltage reference IC, reducing BOM count and board area.

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 (±0.5%), 200 ms min reset timeout, lower quiescent current (1.1 µA)	Lacks adjustable timeout and complementary outputs; requires external inverter for active-high reset	Preferred for ultra-low-power battery-backed systems where fixed timing suffices
MAX6326UT33D3+	3.3 V threshold (±1.5%), push-pull RESET only, no REF output, -40°C to 125°C rating	No reference voltage output; single reset signal limits flexibility in mixed-logic designs	Selected when extended temperature range and minimal footprint (SOT-23-3) outweigh need for dual outputs

Compared with TPS3808G33DBVR and MAX6326UT33D3+, TL7733BCDE4 uniquely delivers adjustable reset duration, true/complement outputs, and a buffered 2.53 V reference - making it optimal for complex embedded systems requiring flexible, deterministic reset control and auxiliary voltage references.

Availability

TL7733BCDE4 is available at Aetrix Electronics and suitable for industrial PLC controllers, notebook power management, factory automation gateways, and network attached storage (NAS) controllers requiring stable component supply across production lifecycles.

Supply support for TL7733BCDE4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and microcontrollers.

The TL77xxB family was designed specifically for robust, precision supply-voltage supervision in microprocessor-based systems - emphasizing threshold accuracy, noise immunity, and flexible reset signaling for industrial and computing applications.

FAQ

What is the exact undervoltage threshold voltage of the TL7733BCDE4?

The TL7733BCDE4 has a nominal negative-going input threshold voltage (V_IT–) of 3.08 V at 25°C, with a guaranteed range of 3.03 V to 3.13 V across the full 0°C to 70°C operating temperature range. This threshold is optimized for monitoring standard 3.3 V power rails and is internally generated using a temperature-compensated bandgap reference.

Does the TL7733BCDE4 require an external pullup resistor on the RESET pin?

No, the TL7733BCDE4 RESET pin is a push-pull output and does not require an external pullup resistor. It actively drives high (V_OH ≥ V_CC – 1.5 V) and low (V_OL ≤ 0.4 V at 16 mA). However, the complementary RESET pin is open-collector and requires an external pullup resistor - typically 10 kΩ - to ensure proper logic levels for the target microcontroller.

How is the reset pulse duration set on the TL7733BCDE4?

The reset pulse duration on the TL7733BCDE4 is set by an external capacitor connected to the CT pin. The relationship is approximately t_d ≈ 26 ms per µF (td ≈ 2.6 × 10⁴ × C_T). For example, a 0.1 µF capacitor yields ~2.6 ms of reset assertion time after the SENSE voltage exceeds the threshold. TI recommends a 0.1 µF ceramic capacitor for typical applications.

Can the TL7733BCDE4 be used to monitor a 5 V supply rail?

Yes, the TL7733BCDE4 can monitor a 5 V rail using a resistive voltage divider at the SENSE input to scale the voltage down to its 3.08 V threshold. The device's wide 3.6 V to 18 V V_CC range supports direct connection to 5 V, and its high-impedance SENSE input minimizes loading. Ensure the divider ratio yields ~3.08 V at SENSE when the rail is at nominal 5 V.

What is the function of the REF pin on the TL7733BCDE4?

The REF pin on the TL7733BCDE4 outputs a precision 2.53 V ±0.05 V reference voltage, derived from an internal temperature-compensated bandgap circuit. It is intended for use as a stable bias or ADC reference in associated circuitry and requires a 0.1 µF bypass capacitor to GND to suppress noise and ensure regulation stability.

TL7733BCDE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 3.08V

Output:: Open Drain or Open Collector

Reset:: Active High/Active Low

Reset Timeout:: 270ns Typical Propagation Delay

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

TL7733BCDE4 FAQ

1.How can I place an order for TL7733BCDE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for TL7733BCDE4 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 TL7733BCDE4 reliable?

The price and inventory of TL7733BCDE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7733BCDE4 is usually 5 days.

3.What payment methods are accepted for TL7733BCDE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7733BCDE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TL7733BCDE4?

TL7733BCDE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TL7733BCDE4 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 TL7733BCDE4?

For technical support, including TL7733BCDE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7733BCDE4 requirements.

6.How does Aetrix verify that TL7733BCDE4 is sourced from the original manufacturer or authorized distributors?

All TL7733BCDE4 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 TL7733BCDE4 meets industry standards.

7.What is the process for return or replacement of TL7733BCDE4?

All TL7733BCDE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL7733BCDE4, 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 TL7733BCDE4 part is unused and in its original packaging.

Return procedure for TL7733BCDE4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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