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Texas Instruments TL7733BCP
- Part No.:
- TL7733BCP
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
TL7733BCP.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,292
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Product details
Overview
TL7733BCP 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 and complement reset outputs (RESET and RESET), features a 3.08 V nominal threshold voltage with 10 mV hysteresis, and supports adjustable reset pulse duration via external CT capacitor. It operates from 3.6 V to 18 V supply and is rated for 0°C to 70°C ambient temperature.
For engineers reviewing the TL7733BCP datasheet, TL7733BCP pinout, TL7733BCP application, or TL7733BCP equivalent, this page delivers verified functional identity, confirmed operating parameters, validated PDIP-8 package mapping, exact pin roles per TI's SLVS037O revision O, and two technically documented alternative parts for voltage supervisor selection in embedded power management.
Technical Context
The TL7733BCP implements a precision bandgap-referenced comparator architecture with temperature-compensated voltage sensing at the SENSE input and internal reference voltage generation at REF (2.53 V typical). Its dual-reset output stage delivers active-high RESET and active-low RESET signals with defined behavior down to VCC ≥ 1 V.
Reset assertion is triggered when SENSE falls below 3.03–3.16 V (full-range) and deasserted after an externally set delay determined by CT capacitance (td ≈ 2.6×10⁴ × CT seconds). The RESIN pin enables manual reset override, forcing RESET high and RESET low regardless of SENSE state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.6 V to 18 V - supports wide-input industrial and computing rails without external regulation |
| SENSE Threshold (VIT–) | 3.03 V (min) to 3.16 V (max) at full temperature range - precise 3.3 V system supervision |
| Hysteresis (VHYS) | 10 mV - prevents chatter during slow-rising/falling supply transitions |
| Reference Output (VREF) | 2.48–2.58 V at 25°C - stable internal reference usable for external circuit biasing |
| Reset Output Drive | ±20 mA - sufficient to directly drive logic inputs or small pull-up networks |
| Operating Temperature | 0°C to 70°C - commercial-grade qualification for notebooks, STB, and factory automation |
| Package Type | PDIP-8 (9.81 mm × 6.35 mm) - through-hole compatible for prototyping and legacy PCBs |
Pinout & Package
TL7733BCP is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 0.300-inch body width and standard 0.1-inch pin pitch. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference voltage output | Provides 2.53 V ±0.05 V reference; requires 0.1 µF bypass capacitor to GND for noise immunity |
| 2 (RESIN) | Reset input | Active-low manual reset control; forces RESET high / RESET low when pulled low |
| 3 (CT) | Timing capacitor connection | External capacitor sets reset pulse duration (td ≈ 26 ms per 1 nF); charges from internal current source |
| 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 pull-up; asserts low during undervoltage or RESIN activation |
| 6 (RESET) | Active-high reset output | Push-pull output; asserts high during undervoltage or RESIN activation; complements RESET |
| 7 (SENSE) | Voltage supervision input | Monitors external rail; triggers reset when voltage drops below 3.03–3.16 V threshold |
| 8 (VCC) | Power supply input | Operates from 3.6–18 V; RESET defined down to VCC ≥ 1 V for brownout detection |
Key Features
| Feature | Design Value |
|---|---|
| True and complement reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Externally adjustable reset pulse duration | CT pin enables precise timing control (e.g., 0.1 µF → ~2.6 ms delay), ensuring reliable processor initialization across varying load conditions |
| Precision voltage sensor with hysteresis | 3.08 V nominal threshold with 10 mV hysteresis prevents false resets during marginal supply recovery |
| Temperature-compensated reference | Internal 2.53 V reference maintains ±0.05 V stability over 0°C–70°C, enabling accurate threshold tracking |
| RESET output defined from VCC ≥ 1 V | Enables early fault detection during power ramp-up, critical for safe microcontroller boot sequencing |
Applications
| Industrial PLC Control | Network Router Power Management |
|---|---|
Use Scenario: Supervises 3.3 V I/O rail in programmable logic controller backplane where voltage droop may occur during high-current actuator switching. IC Role / Device Role / Timing Role: Resets ARM Cortex-M7 microcontroller upon sensed undervoltage, preventing corrupted register writes or firmware lockup. Use Value: 3.08 V threshold matches 3.3 V rail tolerance; 10 mV hysteresis avoids oscillation during transient dips caused by solenoid activation. |
Use Scenario: Monitors PoE-powered Ethernet switch ASIC supply in enterprise routing hardware. IC Role / Device Role / Timing Role: Generates synchronized reset pulse to FPGA configuration logic and PHY controllers during 3.3 V rail instability. Use Value: Complementary RESET/RESET outputs interface directly with Xilinx Spartan-7 FPGA PROG_B and INIT_B pins without level-shifting. |
| Notebook System Reset | Building Automation Gateway |
Use Scenario: Embedded in laptop motherboard to supervise main 3.3 V system rail during battery-to-AC transition. IC Role / Device Role / Timing Role: Triggers EC (Embedded Controller) reset when SENSE detects <3.03 V, ensuring clean boot after power interruption. Use Value: Adjustable CT timing allows tuning reset hold time to match Intel PCH reset specification (≥10 ms). |
Use Scenario: Used in BACnet/IP gateway device to monitor 5 V auxiliary supply powering RS-485 transceivers and sensor interfaces. IC Role / Device Role / Timing Role: Asserts RESET to STM32H7 MCU on undervoltage, halting Modbus TCP stack execution before data corruption occurs. Use Value: REF pin supplies stable 2.53 V reference to external ADC measuring HVAC coil current, improving measurement accuracy. |
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, 200 ms factory-programmed delay, SOT-23-6 package | Lacks adjustable timing and complementary outputs; requires external inverter for active-low reset | Select when board space is constrained and fixed delay suffices; not suitable for designs requiring manual RESIN control or dual-output logic compatibility |
| MAX6326LT33D3+T | 3.3 V threshold, 140 ms min delay, open-drain RESET only, 6-pin SOT23 | No active-high output or REF pin; no RESIN input; tighter initial threshold tolerance (±0.5%) but no hysteresis spec | Prefer for cost-sensitive consumer devices where single-reset signal and minimal footprint outweigh flexibility needs |
Compared with TPS3808G33DBVR and MAX6326LT33D3+T, the TL7733BCP offers unique value in designs requiring user-adjustable reset timing, dual complementary outputs, manual reset override (RESIN), and a buffered reference voltage - making it optimal for industrial and computing platforms needing configurable, robust power-on and brownout reset behavior.
Availability
TL7733BCP is available at Aetrix Electronics and suitable for industrial PLC control, network router power management, notebook system reset, and building automation gateway applications requiring stable component supply across extended production lifecycles.
Supply support for TL7733BCP 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 engineered specifically for reliable reset control in microprocessor-based systems, emphasizing precision threshold accuracy, temperature stability, and flexible timing - targeting industrial, computing, and communications infrastructure.
FAQ
What is the exact undervoltage threshold voltage of the TL7733BCP?
The TL7733BCP has a nominal negative-going input threshold (VIT–) of 3.08 V at 25°C, with a guaranteed range of 3.03 V (min) to 3.16 V (max) across its full 0°C to 70°C operating temperature range. This makes TL7733BCP suitable for supervising standard 3.3 V supply rails with margin for tolerance and drift.
Does the TL7733BCP require an external capacitor on the REF pin?
Yes, TL7733BCP requires a 0.1 µF ceramic capacitor connected between REF (Pin 1) and GND (Pin 4). This capacitor stabilizes the internal reference voltage and suppresses fast transients that could cause false triggering of the reset function - a mandatory design requirement per TI's SLVS037O datasheet Section 8.1.
Can the TL7733BCP be used to monitor a 5 V supply rail?
No - the TL7733BCP is specifically configured for 3.3 V system supervision with a 3.08 V threshold. For 5 V rails, TI specifies TL7705B (4.55 V threshold); using TL7733BCP on 5 V would result in immediate, continuous reset assertion. Always match the supervisor part number suffix (33 = 3.3 V, 05 = 5 V, 02 = 2.5 V) to the target rail.
What is the purpose of the CT pin on the TL7733BCP?
The CT (Capacitor Timing) pin on TL7733BCP connects to an external capacitor that sets the duration of the reset pulse after supply recovery. The internal current source charges CT, and reset deassertion occurs when CT voltage exceeds an internal reference; timing follows td ≈ 2.6×10⁴ × CT seconds (e.g., 0.1 µF yields ~2.6 ms delay), enabling design-specific reset hold times.
Is the TL7733BCP pin-compatible with other TL77xxB variants like TL7705BCP?
Yes - all TL77xxB devices including TL7733BCP, TL7705BCP, and TL7702BCP share identical PDIP-8 pinouts and electrical interfaces. Only the SENSE threshold voltage differs (3.08 V vs. 4.55 V vs. 2.53 V); no PCB layout change is needed when substituting within the same package and temperature grade (C-suffix).
TL7733BCP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
TL7733BCP FAQ
1.How can I place an order for TL7733BCP through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7733BCP 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 TL7733BCP reliable?
The price and inventory of TL7733BCP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7733BCP is usually 5 days.
3.What payment methods are accepted for TL7733BCP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7733BCP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7733BCP?
TL7733BCP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7733BCP 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 TL7733BCP?
For technical support, including TL7733BCP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7733BCP requirements.
6.How does Aetrix verify that TL7733BCP is sourced from the original manufacturer or authorized distributors?
All TL7733BCP 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 TL7733BCP meets industry standards.
7.What is the process for return or replacement of TL7733BCP?
All TL7733BCP units undergo pre-shipment inspection (PSI). If there is an issue with TL7733BCP, 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 TL7733BCP part is unused and in its original packaging.
Return procedure for TL7733BCP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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