TLC7135CNG4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
TLC7135CNG4 is a 4.5-digit dual-slope integrating ADC with 1-channel analog input, accepting -3 V to +6 V analog range and operating from ±5 V supplies. Its dual-slope conversion architecture delivers high noise rejection at 0.003 kSPS throughput. The 28-pin PDIP package suits precision bench instruments, digital panel meters, and laboratory measurement equipment.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 28
- Lifecycle
- OBSOLETE
- Datasheet
- TLC7135CNG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TLC7135CNG4?
- 4.5-digit dual-slope ADC for high-resolution precision measurement
- Single-channel 1 input with -3 V to +6 V analog input range
- Dual-slope integration architecture rejects 50 Hz and 60 Hz line-frequency noise
- ±5 V dual-supply operation for bipolar analog input compatibility
- 0.003 kSPS throughput rate optimized for high-accuracy low-speed sensing
- 28-pin PDIP through-hole package for bench instrument and prototyping use
- Pb-free RoHS-compliant construction
What is TLC7135CNG4 used for?
The TLC7135 is the measurement engine in digital panel meters, benchtop multimeters, and precision data loggers where 4.5-digit (±19999 count) resolution is required at low sample rates. Its dual-slope integration rejects mains-frequency interference, making it well-suited for measuring slow-changing signals such as temperature from thermocouple or RTD front-ends. Laboratory calibration instruments and educational analog measurement boards also use this ADC for its inherent noise rejection without external anti-aliasing filters.
What are the specifications of TLC7135CNG4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Analog Input Voltage-Max | 6V |
| Analog Input Voltage-Min | -3 V |
| Converter Type | ADC, DUAL-SLOPE |
| JESD-30 Code | R-PDIP-T28 |
| JESD-609 Code | e4 |
| Negative Supply Voltage-Nom | -5 V |
| Number of Analog In Channels | 1 |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Output Bit Code | BINARY CODED DECIMAL |
| Output Format | PARALLEL, 4 BITS |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP28,.6 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Sample Rate | 0.000003MHz |
| Screening Level | TS 16949 |
| Supply Current-Max | 3mA |
| Supply Voltage-Nom | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.30 |
Where can I find the TLC7135CNG4 datasheet?
TLC7135CNG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for TLC7135CNG4?
Compatible alternatives and drop-in replacements for TLC7135CNG4:
4-Bit, 1 Func, 1 Channel, Parallel, 4 Bits Access, CMOS, PDIP28
Frequently Asked Questions
How many effective counts does the TLC7135 produce, and how does 4.5 digits translate to resolution?
The 4.5-digit rating means the display or output spans from -19999 to +19999 counts — 40000 total steps — giving roughly 15 bits of effective resolution relative to a ±2 V full-scale input. This is far finer than a standard 12-bit SAR ADC's 4096 steps, making the TLC7135 appropriate for precision DC voltage and resistance measurements.
Why does dual-slope integration in the TLC7135 reject 50 Hz and 60 Hz power line interference?
Dual-slope integration averages the input signal over a fixed integration period. When that period equals one or more full cycles of the mains frequency (20 ms for 50 Hz, 16.67 ms for 60 Hz), positive and negative half-cycles cancel exactly, attenuating line-frequency noise by typically more than 60 dB. This makes the TLC7135 inherently immune to 50 Hz and 60 Hz interference without external notch filtering.
Can the TLC7135CNG4 measure signals below 0 V, and what supply voltage does it need for that?
Yes, the analog input range extends from -3 V to +6 V, and a negative -5 V supply is required for proper operation. The dual ±5 V supply allows the internal reference and integrator to handle negative input voltages, enabling direct measurement of bipolar sensor outputs such as thermocouple cold-junction compensated amplifiers without additional level-shifting circuits.
For a bench digital panel meter design, is the 28-pin PDIP package of the TLC7135CNG4 still practical in modern production?
The 28-pin PDIP remains practical for bench instruments, educational kits, and small-batch production where through-hole assembly is used. Its 2.54 mm lead pitch allows hand-soldering and DIP socket installation for easy replacement. For high-volume or compact SMT designs a dual-slope ADC in a SOIC or SSOP would be preferred, but the PDIP suits legacy instrument designs and repair-friendly professional equipment.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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