My Inquiry
My Account
Texas Instruments TL7770-12CDWG4
- Part No.:
- TL7770-12CDWG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TL7770-12CDWG4.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,334
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL7770-12CDWG4 from Texas Instruments is a dual-channel power-supply supervisor IC designed for microcomputer and microprocessor systems requiring precise overvoltage and undervoltage monitoring. It features 12-V undervoltage sensing on Channel 1 (1VSU), programmable 1.5-V undervoltage threshold on Channel 2 (2VSU), 2.6-V overvoltage detection at VSO, true/complementary reset outputs, and 250-mA peak SCR gate drive capability - deployed in industrial control power-up sequencing and fault protection circuits.
For engineers reviewing the TL7770-12CDWG4 datasheet, TL7770-12CDWG4 pinout, TL7770-12CDWG4 application, or TL7770-12CDWG4 equivalent, key selection criteria include its dual independent voltage thresholds, externally adjustable reset pulse duration via timing capacitor, SCR-triggered overvoltage response, and SOIC-16 package compatibility with legacy 5-V/12-V system rails.
Technical Context
The TL7770-12CDWG4 implements two independent supervisor channels: Channel 1 monitors a fixed 12-V supply (VIT+ = 10.9 V typical) with 36-mV hysteresis, while Channel 2 supports programmable undervoltage detection down to 1.5 V (VIT– = 1.5 V typical) with only 5-mV hysteresis. Each channel integrates a precision temperature-compensated voltage reference and separate RESIN-triggered time-delay latching logic.
Its overvoltage protection circuit uses an internal SCR triggered when VSO exceeds 2.6 V, delivering 250-mA peak current to the SCR DRIVE terminal for driving external high-current SCRs or warning indicators. Reset assertion is guaranteed once VCC exceeds 1 V, and both RESET and RESET outputs remain active until VSU crosses its threshold with built-in timing delay determined by external CT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Undervoltage Threshold (1VSU) | 10.9 V typical - sets precise 12-V rail monitoring point with ±0.22 V tolerance |
| Undervoltage Threshold (2VSU) | 1.5 V typical - enables flexible low-voltage monitoring of auxiliary or logic supplies |
| Overvoltage Threshold (VSO) | 2.6 V typical - triggers SCR-based overvoltage shutdown at fixed reference level |
| SCR Drive Peak Current | 250 mA - sufficient to directly trigger high-current external SCRs without buffer stages |
| Reset Activation Voltage | 1 V minimum - ensures reliable power-on reset initiation even during slow-ramp VCC startup |
| Supply Voltage Range | 3.5 V to 18 V - supports wide-input industrial and automotive power rails |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded systems with stable thermal environments |
Pinout & Package
TL7770-12CDWG4 is housed in a 16-pin SOIC (DW) package with standard 1.27-mm pitch, RoHS-compliant green finish, and moisture sensitivity level (MSL) 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1RESIN, 2RESIN | Manual reset input (active-low) | External trigger to initiate time-delayed reset sequence during normal operation |
| 1CT, 2CT | Timing capacitor connection | Determines reset pulse duration (td ≈ 20 × 10³ × C); requires series resistor RT per TI design note |
| 1RESET, 2RESET | Active-low reset output | Drives microcontroller reset input directly; sinks up to 16 mA |
| 1RESET, 2RESET | Active-high reset output | Complementary signal for logic-level interface or OR-ing with other reset sources |
| 1VSU, 2VSU | Undervoltage sense inputs | Monitor supply rails; 1VSU fixed for ~12 V, 2VSU programmable for lower voltages |
| 1VSO, 2VSO | Overvoltage sense inputs | Fixed 2.6-V threshold; triggers SCR DRIVE when exceeded |
| 1SCR DRIVE, 2SCR DRIVE | SCR gate drive output | Delivers 250-mA peak current to fire external SCRs during overvoltage events |
| VCC | Positive supply input | Power source for internal circuitry; must be ≥3.5 V for full functionality |
| GND | Ground reference | Common return path for all analog and digital functions |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supervisors | Enables simultaneous monitoring of main 12-V rail and auxiliary low-voltage rail (e.g., 3.3 V or 1.8 V) with separate thresholds and timing |
| Programmable reset pulse duration | External CT capacitor allows precise tailoring of reset hold time (e.g., 100 ms to 1 s) to match processor requirements |
| 250-mA SCR gate drive | Eliminates need for discrete SCR driver transistors or optocouplers in overvoltage crowbar circuits |
| True + complementary reset outputs | Supports direct connection to both active-low and active-high reset inputs without external inverters |
| Temperature-compensated reference | Maintains ±1.5% threshold accuracy across 0°C to 70°C, critical for reliable reset across environmental conditions |
Applications
| Industrial PLC Power Sequencing | Telecom Line Card Protection |
|---|---|
|
Use Scenario: Sequential power-up of multiple voltage domains (12 V, 5 V, 3.3 V) in programmable logic controllers. IC Role / Device Role / Timing Role: TL7770-12CDWG4 supervises 12-V primary rail and 1.5-V auxiliary rail, asserting synchronized reset until both stabilize. Use Value: Prevents firmware lockup due to partial power delivery; eliminates need for discrete RC timers or multiple single-channel supervisors. |
Use Scenario: Overvoltage fault response in telecom line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: TL7770-12CDWG4 detects >2.6 V on VSO and fires 250-mA SCR gate drive to short-circuit input rail. Use Value: Achieves sub-microsecond overvoltage shutdown without external comparator or driver circuitry. |
| Embedded Medical Instrument Boot Control | Automotive Body Control Module (BCM) |
|
Use Scenario: Ensuring clean boot of ARM-based medical data loggers after battery insertion or cold start. IC Role / Device Role / Timing Role: TL7770-12CDWG4 monitors 12-V battery input and 3.3-V LDO output, holding reset until both exceed thresholds with configurable delay. Use Value: Guarantees CPU enters known state before firmware execution, meeting IEC 62304 power-on reliability requirements. |
Use Scenario: Monitoring 12-V vehicle battery and 5-V microcontroller supply in body control modules subject to load-dump transients. IC Role / Device Role / Timing Role: TL7770-12CDWG4 provides dual-rail supervision with SCR-driven crowbar for >28-V load dump events. Use Value: Integrates undervoltage lockout, overvoltage shutdown, and reset generation in one SOIC-16 device, reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3619-12DBVR | Single-channel, 12-V supervisor with watchdog timer; no SCR drive or dual-channel capability | Lacks overvoltage protection and second monitoring channel; suitable only for basic reset-only use cases | Select when only 12-V monitoring and reset are needed, and SCR crowbar is unnecessary |
| MAX6822TUT+T | Single-supply, 12-V supervisor with 200-ms fixed reset timeout; no programmable CT or SCR output | No overvoltage response or manual reset latching; limited to simple power-on reset | Choose for cost-sensitive designs where timing flexibility and overvoltage protection are not required |
Compared with TL7770-12CDWG4, both alternatives lack dual independent supervision, programmable reset timing, and integrated 250-mA SCR drive - making them unsuitable replacements in applications requiring coordinated multi-rail monitoring and active overvoltage fault response.
Availability
TL7770-12CDWG4 is available at Aetrix Electronics and suitable for industrial PLC power sequencing, telecom line card protection, embedded medical instrument boot control, and automotive body control module designs requiring stable component supply and long-term manufacturability.
Supply support for TL7770-12CDWG4 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, specializing in analog, embedded processing, and power management technologies since 1930.
The TL7770 family was developed to provide robust, dual-rail power supervision with integrated overvoltage protection for microcomputer systems in industrial and telecom infrastructure where reliability under voltage fault conditions is critical.
FAQ
What is the undervoltage threshold accuracy of TL7770-12CDWG4 across temperature?
The TL7770-12CDWG4 specifies a 12-V undervoltage threshold (1VSU) of 10.68 V to 11.12 V over 0°C to 70°C, yielding ±2% tolerance. This accuracy is maintained by an internal temperature-compensated voltage reference, ensuring consistent reset behavior without external calibration. The TL7770-12CDWG4 meets this spec under recommended operating conditions with VCC between 3.5 V and 18 V.
Can TL7770-12CDWG4 monitor both 12-V and 5-V rails simultaneously?
Yes - TL7770-12CDWG4 has two independent supervisor channels: Channel 1 (1VSU) is factory-configured for ~12-V monitoring (10.9 V typical), while Channel 2 (2VSU) supports programmable undervoltage detection down to 1.5 V, enabling direct 5-V rail supervision using external resistor dividers. Both channels generate synchronized reset signals with individually adjustable timing via CT pins.
Does TL7770-12CDWG4 require external components to function as a basic supervisor?
TL7770-12CDWG4 operates as a functional supervisor with only VCC, GND, and monitored supply connections - but full feature utilization requires external components: timing capacitors (CT) for reset pulse duration, resistor dividers for 2VSU programming, and an external SCR or thyristor for overvoltage protection. The TL7770-12CDWG4 datasheet provides design equations and layout guidance for each.
What is the maximum continuous current rating for the SCR DRIVE output of TL7770-12CDWG4?
The SCR DRIVE output of TL7770-12CDWG4 delivers 25 mA continuous current and 250 mA peak (1-ms pulse), as specified in the absolute maximum ratings and electrical characteristics tables. This allows direct drive of common SCRs like the MCR106-6 or BT169G without additional transistor buffering. Exceeding 25 mA continuous may cause thermal stress beyond safe operating area limits.
Is TL7770-12CDWG4 pin-compatible with earlier TL7770 variants like TL7770-5CDWG4?
Yes - TL7770-12CDWG4 shares identical SOIC-16 (DW) packaging, pinout, and functional architecture with TL7770-5CDWG4 and other TL7770-xCDWG4 variants. The only difference is the factory-trimmed undervoltage threshold on Channel 1 (12 V vs. 5 V). System designers can substitute TL7770-12CDWG4 into existing TL7770-5CDWG4 layouts without PCB changes, provided the 1VSU sense network matches the 12-V rail.
TL7770-12CDWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 12V, Adj
- 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:
- 16-SOIC
TL7770-12CDWG4 FAQ
1.How can I place an order for TL7770-12CDWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL7770-12CDWG4 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 TL7770-12CDWG4 reliable?
The price and inventory of TL7770-12CDWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL7770-12CDWG4 is usually 5 days.
3.What payment methods are accepted for TL7770-12CDWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL7770-12CDWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL7770-12CDWG4?
TL7770-12CDWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL7770-12CDWG4 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 TL7770-12CDWG4?
For technical support, including TL7770-12CDWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL7770-12CDWG4 requirements.
6.How does Aetrix verify that TL7770-12CDWG4 is sourced from the original manufacturer or authorized distributors?
All TL7770-12CDWG4 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 TL7770-12CDWG4 meets industry standards.
7.What is the process for return or replacement of TL7770-12CDWG4?
All TL7770-12CDWG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL7770-12CDWG4, 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 TL7770-12CDWG4 part is unused and in its original packaging.
Return procedure for TL7770-12CDWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL7770-12CDWG4 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
