TLC556MJB Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments TLC556MJB is a dual CMOS timer IC capable of generating pulse and rectangular waveforms up to 1.2 MHz in a ceramic glass-sealed 14-pin DIP package. It operates at supply voltages up to 15 V with two independent timer channels for monostable and astable applications. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 14
- Lifecycle
- ACTIVE
- Datasheet
- TLC556MJB Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TLC556MJB?
- Dual independent timer channels enabling simultaneous monostable and astable operation in a single 14-pin DIP
- 1.2 MHz maximum output frequency supporting high-speed pulse generation and PWM waveform synthesis applications
- Ceramic glass-sealed DIP-14 package providing high reliability and moisture resistance for military and harsh-environment use
What is TLC556MJB used for?
The TLC556MJB serves as a versatile dual timing element in oscillator circuits, pulse-width modulation generators, and sequential timing logic for industrial and military-grade hardware. Its 1.2 MHz maximum frequency capability makes it practical for audio tone generation, frequency division chains, and time-delay circuits where dual independent channels eliminate the need for a second IC. The ceramic package qualifies the device for high-reliability applications such as aerospace instrumentation and downhole electronics where moisture and thermal cycling are concerns.
What are the specifications of TLC556MJB?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | IT CAN ALSO OPERATE AT 15V NOMINAL |
| Analog IC - Other Type | PULSE; RECTANGULAR |
| JESD-30 Code | R-GDIP-T14 |
| JESD-609 Code | e0 |
| Number of Functions | 2 |
| Output Frequency-Max | 1.2MHz |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP14,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Screening Level | MIL-STD-883 |
| Supply Current-Max (Isup) | 1.4mA |
| Supply Voltage-Max (Vsup) | 15V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| 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) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the TLC556MJB datasheet?
TLC556MJB Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for TLC556MJB?
Compatible alternatives and drop-in replacements for TLC556MJB:
Frequently Asked Questions
How does TLC556MJB's 1.2 MHz maximum frequency enable precise PWM generation in motor control applications?
The TLC556MJB can produce a continuous astable waveform up to 1.2 MHz, giving designers a wide duty-cycle adjustment range for PWM motor drives without aliasing audible noise below 20 kHz. At a typical 100 kHz switching frequency, the device provides 10 µs period resolution, suitable for brushed DC motor speed control loops that update the duty cycle every few milliseconds. Two independent channels allow simultaneous PWM generation and a separate timing reference on the same IC.
Why does the ceramic glass-sealed package of TLC556MJB make it preferable to plastic DIP versions in harsh environments?
The ceramic glass-sealed DIP-14 package of TLC556MJB achieves a hermetic seal with moisture ingress far lower than plastic packages, enabling stable operation through thermal cycles from -55 °C to +125 °C without parameter drift caused by moisture absorption. This hermetic construction meets MIL-STD-883 test requirements for shock and vibration, making TLC556MJB suitable for military electronics, avionics timing circuits, and downhole instrumentation where plastic-encapsulated parts would fail within thousands of hours.
When is TLC556MJB a better choice than a single 555 timer for sequential delay circuits?
In a two-stage sequential delay where the first timeout triggers a second delay, TLC556MJB handles both timers in a single 14-pin package, saving the board space and solder joints of two separate NE555 or TLC555 ICs. Cascading internal channels also guarantees matched supply voltage characteristics and eliminates timing skew from power-rail differences between discrete devices. For supply voltages up to 15 V and delay periods from microseconds to seconds using standard RC networks, the dual architecture simplifies routing and reduces BOM line items by one.
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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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