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Texas Instruments TLC555IDG4
- Part No.:
- TLC555IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC555IDG4.pdf
- Description:
- IC OSC SGL TIMER 2.1MHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,099
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Product details
Overview
TLC555IDG4 from Texas Instruments is a CMOS monolithic timer IC functionally interchangeable with the NE555 and featuring identical 8-pin SOIC (D) package pinout. It operates from 2V to 15V, delivers rail-to-rail CMOS output swing, sinks up to 100mA, and consumes only 350µA typical at 5V - enabling precision timing in battery-powered and industrial control circuits.
For engineers reviewing the TLC555IDG4 datasheet, TLC555IDG4 pinout, TLC555IDG4 application, or TLC555IDG4 equivalent, key selection considerations include its low supply current (350µA typ @ 5V), high sink capability (100mA), wide VDD range (2–15V), rail-to-rail output compatibility with CMOS/TTL/MOS, and guaranteed operation from –40°C to +85°C.
Technical Context
The TLC555IDG4 implements a dual-comparator architecture with an SR latch and open-drain discharge switch, where trigger (TRIG) and threshold (THRES) inputs reference internal resistive divider nodes at ~1/3 and ~2/3 VDD respectively. Its high-impedance inputs (≤150pA leakage) enable use of smaller timing capacitors than bipolar 555 variants, improving accuracy and reducing component count.
Timing behavior is governed by external RC networks: in monostable mode, pulse width ≈ 1.1 × RAC; in astable mode, frequency ≈ 1.44 / [(RA + 2RB)C], with duty cycle adjustable via RA/RB ratio. The CONT pin allows dynamic threshold adjustment and bypass capacitor connection for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 15V - supports single-supply operation across battery, industrial, and automotive rails without level-shifting. |
| Supply Current (typ @ 5V) | 350µA - enables >1-year battery life in low-duty-cycle timing applications (e.g., sensor wake-up intervals). |
| Output Sink Current | 100mA typical - directly drives LEDs, relays, or MOSFET gates without external buffers. |
| Output Source Current | 10mA typical - sufficient for TTL/CMOS logic interface and small-signal loads. |
| Max Operating Frequency | 2.1MHz - supports high-speed pulse generation, PWM, and linear ramp applications beyond standard 555 limits. |
| Input Leakage Current | ≤150pA max - minimizes RC timing error and enables nanoampere-level biasing for ultra-low-power designs. |
| Temperature Range | –40°C to +85°C - qualified for extended industrial environments including motor controls and instrumentation. |
Pinout & Package
Package: SOIC-8 (D package), 4.9mm × 6.0mm body size, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal circuitry and discharge switch; must be low-impedance for stable timing. |
| TRIG (Pin 2) | Start-of-timing input | Active-low edge-sensitive trigger: falling edge below ~1/3 VDD initiates timing cycle; high-impedance (≤150pA) minimizes loading. |
| OUT (Pin 3) | Timer output | CMOS push-pull output capable of rail-to-rail swing; sources 10mA / sinks 100mA; drives logic or medium-power loads directly. |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH low regardless of TRIG/THRES state; requires pullup if unused. |
| CONT (Pin 5) | Control voltage input | Direct access to internal 2/3 VDD node; used for threshold modulation or bypass capacitor connection to reduce noise sensitivity. |
| THRES (Pin 6) | End-of-timing input | Falling edge above ~2/3 VDD terminates timing cycle; high-impedance input enables precise RC time constant control. |
| DISCH (Pin 7) | Discharge switch output | Open-drain NMOS switch tied to GND when OUT is low; discharges external timing capacitor rapidly and predictably. |
| VDD (Pin 8) | Power supply | Single positive supply input; accepts 2–15V; internal regulation ensures stable comparator thresholds across full range. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail CMOS output | Enables direct interfacing with 3.3V/5V logic families and eliminates level-shifter components in mixed-voltage systems. |
| 100mA sink capability | Drives electromechanical loads (e.g., small relays, solenoids) or high-brightness LEDs without external transistor stages. |
| 2V minimum supply voltage | Supports operation from single Li-ion (3.0–4.2V), two alkaline cells (2.4–3.2V), or energy-harvesting sources down to 2V. |
| ESD protection ≥1000V HBM | Meets ANSI/ESDA/JEDEC JS-001 requirements, reducing board-level ESD mitigation complexity in end-equipment design. |
| Functionally interchangeable with NE555 | Drop-in replacement in legacy 555 designs - same pinout, timing equations, and PCB footprint - with improved power/performance. |
Applications
| Precision Timing Circuit | Pulse Width Modulation Generator |
|---|---|
|
Use Scenario: Generating accurate, repeatable delays in microcontroller-based sensor sampling systems where timing stability over temperature is critical. IC Role / Device Role / Timing Role: Monostable timer providing fixed-duration wake-up pulses to enable low-power MCU sleep modes between measurements. Use Value: 350µA typical supply current extends battery life; ±0.5%/V supply sensitivity ensures <1% timing drift across 3.3V–5V supply variations. |
Use Scenario: Controlling LED brightness or motor speed in industrial HMI panels using analog-compatible PWM signals. IC Role / Device Role / Timing Role: Astable multivibrator generating variable-duty-cycle square waves via potentiometer-adjusted RA/RB network. Use Value: 100mA sink capability drives 20mA LEDs directly; rail-to-rail output ensures full 0–100% duty cycle range without clipping. |
| Linear Ramp Generator | Time-Delay Relay Replacement |
|
Use Scenario: Creating sawtooth waveforms for analog-to-digital conversion clocking or waveform synthesis in test equipment. IC Role / Device Role / Timing Role: Constant-current charging of capacitor via DISCH-controlled discharge path, producing linear voltage ramps. Use Value: Low input leakage (<150pA) prevents capacitor self-discharge errors; 2.1MHz max frequency supports ramp rates up to 1MHz. |
Use Scenario: Replacing electromechanical time-delay relays in HVAC control panels requiring silent, maintenance-free operation. IC Role / Device Role / Timing Role: Monostable timer driving a MOSFET gate to energize a 24VDC relay coil after user button press. Use Value: 15V absolute max rating accommodates 24V system transients; SOIC-8 package enables compact PCB layout vs. through-hole relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE555P | Bipolar process; 10mA max sink; 6mA source; 10mA supply current @ 5V; no ESD rating specified. | Limited to higher-power, lower-accuracy applications; unsuitable for battery operation or high-impedance RC networks. | Select NE555P only when cost is primary constraint and power/timing accuracy requirements are relaxed. |
| LMC555IMX/NOPB | CMOS process like TLC555; 100mA sink; 10mA source; 100µA supply current @ 5V; wider temp range (–55°C to +125°C). | Better suited for extreme-temperature environments (e.g., automotive under-hood); lower power enables longer battery life. | Choose LMC555IMX/NOPB for aerospace, automotive, or extended-temperature industrial applications where ultra-low IDD is critical. |
Compared with NE555P and LMC555IMX/NOPB, the TLC555IDG4 offers optimal balance of industrial temperature range (–40°C to +85°C), 350µA supply current, 100mA sink drive, and SOIC-8 footprint - making it ideal for cost-sensitive yet performance-demanding embedded timing tasks.
Availability
TLC555IDG4 is available at Aetrix Electronics and suitable for precision timing, pulse generation, and time-delay relay replacement applications requiring stable component supply, long-term manufacturability, and industrial-grade reliability.
Supply support for TLC555IDG4 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 specializing in analog, embedded processing, and digital signal technologies with over 90 years of innovation in precision timing and power management solutions.
The TLC555 product line was designed for general-purpose timing applications demanding low power, high output drive, and wide supply voltage tolerance - targeting industrial controls, instrumentation, and consumer electronics.
FAQ
What is the maximum operating frequency of the TLC555IDG4?
The TLC555IDG4 achieves a maximum astable operating frequency of 2.1MHz under specified conditions (RA = 470Ω, CT = 200pF, RB = 200Ω, VDD = 5V, TA = 25°C). This exceeds standard NE555 performance and supports high-speed PWM, pulse generation, and linear ramp applications where timing resolution is critical. Frequency decreases with higher VDD or temperature due to propagation delay effects.
Does the TLC555IDG4 support single-supply operation?
Yes, the TLC555IDG4 supports true single-supply operation from 2V to 15V. Its internal CMOS comparators and output stage are fully functional across this range, enabling direct use with 2-cell alkaline batteries (2.4–3.2V), Li-ion cells (3.0–4.2V), or industrial 5V/12V rails without auxiliary supplies or level shifters.
How does the TLC555IDG4 differ from the NE555 in terms of power consumption?
The TLC555IDG4 consumes only 350µA typical supply current at 5V, compared to ~6mA for the NE555 - a reduction of over 94%. This stems from its CMOS process architecture, which eliminates quiescent current paths present in bipolar NE555 designs. The result is dramatically extended battery life and reduced thermal load in portable and sealed-system applications.
Can the TLC555IDG4 drive a relay coil directly?
Yes, the TLC555IDG4 can drive small 5V or 12V relay coils directly via its OUT pin (10mA source) or DISCH pin (100mA sink). For example, a 5V/30mA relay coil may be connected between VDD and OUT, while a 12V/50mA coil is better driven between VDD and DISCH. Always verify coil resistance and ensure VDD remains within 2–15V during switching to avoid latch-up.
Is the TLC555IDG4 pin-compatible with the NE555?
Yes, the TLC555IDG4 is functionally interchangeable with the NE555 and uses the identical 8-pin SOIC (D) package pinout. All pins - GND, TRIG, OUT, RESET, CONT, THRES, DISCH, and VDD - match position-for-position, allowing drop-in replacement in existing NE555 designs without PCB modification or firmware changes.
TLC555IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 2.1MHz
- Voltage - Supply:
- 3V ~ 15V
- Current - Supply:
- 360 µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC555IDG4 FAQ
1.How can I place an order for TLC555IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC555IDG4 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 TLC555IDG4 reliable?
The price and inventory of TLC555IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC555IDG4 is usually 5 days.
3.What payment methods are accepted for TLC555IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC555IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC555IDG4?
TLC555IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC555IDG4 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 TLC555IDG4?
For technical support, including TLC555IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC555IDG4 requirements.
6.How does Aetrix verify that TLC555IDG4 is sourced from the original manufacturer or authorized distributors?
All TLC555IDG4 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 TLC555IDG4 meets industry standards.
7.What is the process for return or replacement of TLC555IDG4?
All TLC555IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC555IDG4, 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 TLC555IDG4 part is unused and in its original packaging.
Return procedure for TLC555IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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