My Inquiry
My Account
Texas Instruments UCC2946DTRG4
- Part No.:
- UCC2946DTRG4
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2946DTRG4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,018
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCC2946DTRG4 from Texas Instruments is a microprocessor supervisor IC with integrated watchdog timer, programmable reset threshold (1.235 V ±2%), programmable reset period (140–320 ms), and programmable watchdog period (0.96–2.56 s). It operates from 2.1 V to 5.5 V, draws ≤18 µA supply current, and asserts valid reset down to VDD = 1 V - used in industrial embedded systems requiring reliable power-on and fault recovery.
For engineers reviewing the UCC2946DTRG4 datasheet, UCC2946DTRG4 pinout, UCC2946DTRG4 application, or UCC2946DTRG4 equivalent, key selection criteria include its –40°C to +95°C operating temperature range, 8-pin TSSOP (PW) package, independent RES/WDO outputs, and precision 400 nA timing current sources for external capacitor-based programming of reset and watchdog intervals.
Technical Context
The UCC2946DTRG4 implements dual independent timing paths: one for power-on reset (via RP pin charging CRP at 400 nA) and another for watchdog timeout (via WP pin charging CWP at 400 nA). Its internal 1.235 V reference enables precise threshold setting via external resistor divider on RTH.
Reset assertion remains valid even when VDD drops to 1 V, and glitch immunity is enforced by voltage-duration filtering per Figure 1. Watchdog function disables during active reset, and WDO output is actively driven low upon timeout - compatible with non-maskable interrupt (NMI) inputs of industrial microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 2.1 V to 5.5 V - supports wide-input industrial rails including 3.3 V and 5 V systems |
| Reset Threshold Accuracy | 1.235 V ±2% - enables accurate undervoltage detection with <±25 mV error over temperature |
| Supply Current | ≤18 µA max - ensures minimal impact on battery-backed or low-power standby modes |
| Reset Valid Down to | VDD = 1 V - guarantees functional reset assertion even during deep brownout conditions |
| Watchdog Period Range | 0.96 s to 2.56 s (with 64 nF CWP) - provides configurable fault-detection latency for real-time recovery |
| Reset Period Range | 140 ms to 320 ms (with 64 nF CRP) - allows tuning of power-up stabilization time before processor release |
| Temperature Range | –40°C to +95°C - qualified for extended industrial environments, not commercial or automotive |
Pinout & Package
UCC2946DTRG4 is housed in an 8-pin TSSOP (PW) package (JEDEC MO-153, 3.0 mm × 4.4 mm, 0.65 mm pitch), optimized for space-constrained industrial PCBs. Pin functions are validated per SLUS247B connection diagram and block diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for all internal analog and digital circuitry; must be low-impedance connection |
| RTH (Pin 2) | Reset threshold input | High-impedance node comparing external resistor-divider voltage to 1.235 V internal reference |
| RES (Pin 3) | Active-low reset output | Open-drain output asserting low during power-up, brownout, or manual reset; requires pull-up |
| RP (Pin 4) | Reset period timing input | 400 nA constant-current source charging external CRP capacitor to set reset pulse duration |
| WDI (Pin 5) | Watchdog input | Edge-sensitive input toggled by host MCU to prevent watchdog timeout; ignores static levels |
| WP (Pin 6) | Watchdog period timing input | 400 nA constant-current source charging external CWP capacitor to define watchdog timeout interval |
| VDD (Pin 8) | Power supply | Primary supply rail; powers internal reference, comparators, and timing circuits; decoupling required |
Key Features
| Feature | Design Value |
|---|---|
| Fully programmable reset threshold | Set via external R1/R2 divider on RTH pin - supports monitoring of any voltage rail, not just VDD |
| Independent reset and watchdog outputs | Separate RES and WDO pins allow flexible system-level reset arbitration (e.g., OR-gating or priority routing) |
| Glitch-immune reset detection | Rejects transients below thresholds defined in Figure 1 - prevents spurious resets from EMI or switching noise |
| Low-quiescent-current timing | 400 nA precision current sources on RP and WP enable stable, low-power timing with NPO capacitors |
| Valid reset at 1 V VDD | Ensures deterministic behavior during deep undervoltage - critical for fail-safe shutdown sequencing |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Power-up initialization and runtime fault detection in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings and noisy 24 V DC supplies. IC Role / Device Role / Timing Role: Supervisor IC providing POR, brownout protection, and watchdog supervision - releases CPU only after stable VDD and validates continuous firmware execution. Use Value: Prevents erratic program flow during unstable input voltage; 1 V reset validity ensures safe shutdown before EEPROM corruption occurs. | Use Scenario: Long-life, battery-assisted metering unit requiring >10-year field operation with tamper-resistant firmware integrity checks. IC Role / Device Role / Timing Role: Dual-function supervisor: monitors main 3.3 V rail for reset, while WDI toggling confirms MCU health every 1–2 seconds. Use Value: 18 µA quiescent current minimizes battery drain; programmable watchdog period aligns with metering firmware cycle without oversizing capacitor footprint. |
| Factory Automation I/O Module | Medical Diagnostic Equipment |
Use Scenario: Modular I/O expansion card with isolated CAN and analog inputs, powered from shared 5 V backplane with transient coupling risk. IC Role / Device Role / Timing Role: Reset supervisor with glitch filtering on RTH - rejects fast spikes from relay switching or motor drives on shared supply. Use Value: 15 mV hysteresis and Figure 1-defined delay filtering eliminate false resets, improving system uptime in electrically harsh environments. | Use Scenario: Portable ultrasound or patient monitor requiring fail-safe boot sequence and runtime watchdog coverage for FDA Class II compliance. IC Role / Device Role / Timing Role: Primary reset generator and watchdog enforcer - RES tied to FPGA/CPU reset, WDO connected to NMI for immediate fault-handling routine invocation. Use Value: Independent RES/WDO outputs enable layered safety architecture; –40°C to +95°C rating covers clinical and transport temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT29D3+ | Fixed 2.93 V reset threshold; no programmable watchdog; 3-pin SOT23 package | Lacks watchdog and threshold programming - suitable only for basic POR, not fault-recovery systems | Select only if design requires ultra-small footprint and does not need runtime supervision |
| TPS3808G33DBVR | Fixed 3.3 V reset threshold; programmable watchdog (0.5–10 s); 6-pin SOT23 | No reset period programming; lower temp range (–40°C to +85°C); higher IQ (20 µA) | Choose when fixed 3.3 V rail monitoring suffices and wider watchdog range is needed over UCC2946DTRG4 |
Compared with MAX6326UT29D3+ and TPS3808G33DBVR, the UCC2946DTRG4 uniquely supports full programmability of both reset threshold and reset period - enabling precise adaptation to non-standard supply voltages and custom boot timing, while maintaining industrial-grade temperature performance and ultra-low current draw.
Availability
UCC2946DTRG4 is available at Aetrix Electronics and suitable for industrial automation, smart metering, and medical diagnostic equipment requiring stable component supply across extended temperature and long product lifecycles.
Supply support for UCC2946DTRG4 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The UCC2946DTRG4 belongs to TI's legacy microprocessor supervisor family designed specifically for robust, programmable power monitoring and fault recovery in harsh industrial environments - emphasizing precision, low power, and configurability over cost-optimized fixed-threshold alternatives.
FAQ
What is the operating temperature range for UCC2946DTRG4?
The UCC2946DTRG4 is rated for operation from –40°C to +95°C. This extended industrial temperature range is confirmed in the SLUS247B datasheet's Electrical Characteristics table under "UCC2946" column, where TA = –40°C to 95°C is explicitly specified. It is not qualified for automotive (–40°C to +125°C) or military (–55°C to +125°C) grades.
Can UCC2946DTRG4 monitor a voltage other than VDD?
Yes, the UCC2946DTRG4 can monitor any voltage rail using the RTH pin. As described in the "Programming the Reset Voltage" section of SLUS247B, the reset threshold is set by an external resistor divider (R1/R2) referenced to the internal 1.235 V bandgap. This allows direct monitoring of 1.8 V, 2.5 V, or 3.3 V rails - independent of the VDD supply powering the UCC2946DTRG4 itself.
How is the reset period programmed on UCC2946DTRG4?
The reset period on UCC2946DTRG4 is programmed using an external capacitor (CRP) connected to the RP pin. Per SLUS247B, TRP (ms) = 3.125 × CRP (nF), with CRP charged by a precision 400 nA current source. For example, a 64 nF capacitor yields a typical reset period of 200 ms. NPO ceramic capacitors are recommended to maintain timing accuracy.
Does UCC2946DTRG4 support connecting WDO directly to RES?
Yes, SLUS247B explicitly describes connecting WDO to RES for simplified reset arbitration. When both pins drive low, the dominant low level prevails. However, the datasheet cautions that this causes additional current flow from VDD to GND during conflicting states. If current budget is constrained, an external OR gate is recommended instead - a design choice confirmed in the "Connecting WDO to RES" subsection.
What is the minimum VDD required for UCC2946DTRG4 to assert a valid reset signal?
The UCC2946DTRG4 asserts a valid reset signal down to VDD = 1 V, as stated in the "Minimum VDD" row of the Electrical Characteristics table (Note 1) and reinforced in the Description section: "RES is guaranteed low with VDD voltages as low as 1 V." This ensures fail-safe reset behavior during deep brownout, prior to complete power collapse.
UCC2946DTRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
UCC2946DTRG4 FAQ
1.How can I place an order for UCC2946DTRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2946DTRG4 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 UCC2946DTRG4 reliable?
The price and inventory of UCC2946DTRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2946DTRG4 is usually 5 days.
3.What payment methods are accepted for UCC2946DTRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2946DTRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2946DTRG4?
UCC2946DTRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2946DTRG4 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 UCC2946DTRG4?
For technical support, including UCC2946DTRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2946DTRG4 requirements.
6.How does Aetrix verify that UCC2946DTRG4 is sourced from the original manufacturer or authorized distributors?
All UCC2946DTRG4 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 UCC2946DTRG4 meets industry standards.
7.What is the process for return or replacement of UCC2946DTRG4?
All UCC2946DTRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC2946DTRG4, 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 UCC2946DTRG4 part is unused and in its original packaging.
Return procedure for UCC2946DTRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC2946DTRG4 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…
