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Texas Instruments TLC555QDRG4
- Part No.:
- TLC555QDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TLC555QDRG4.pdf
- Description:
- IC OSC SGL TIMER 2.1MHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,113
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Product details
Overview
TLC555QDRG4 from Texas Instruments is a CMOS monolithic timer IC designed for precision timing, pulse generation, and sequential control in automotive-grade systems. It operates from 5V to 15V supply, delivers rail-to-rail CMOS output swing, sinks up to 100mA, sources 10mA, and supports astable/monostable modes up to 2.1MHz - deployed in engine control modules requiring stable, low-power timing under extended temperature ranges.
For engineers reviewing the TLC555QDRG4 datasheet, TLC555QDRG4 pinout, TLC555QDRG4 application, or TLC555QDRG4 equivalent, this page provides verified electrical specs, automotive-qualified thermal behavior (–40°C to +125°C), SOIC-8 package mapping, functional interchangeability with NE555, and validated alternative options for timing-critical designs.
Technical Context
The TLC555QDRG4 implements a dual-comparator architecture with an SR latch and high-current output stage, where trigger (TRIG) and threshold (THRES) inputs reference internal resistor-divider voltages at ~1/3 VDD and ~2/3 VDD respectively. The CONT pin allows direct adjustment of these thresholds via external voltage or bypass capacitor.
Its discharge (DISCH) terminal functions as an open-collector output tied to GND when OUT is low, enabling precise RC-based timing cycles. Reset (RESET) is active-low and overrides all other inputs, ensuring deterministic reinitialization in safety-critical automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5V to 15V - enables operation across automotive battery transients without external regulation |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 for under-hood and powertrain applications |
| Max Output Sink Current | 100mA typical at VDD = 15V - drives relays, LEDs, or MOSFET gates directly without buffer stages |
| Supply Current (VDD = 5V) | 180–350µA typical - reduces system-level power consumption and thermal load in always-on modules |
| Timing Frequency Max | 2.1MHz - supports high-speed PWM generation and fast-response timing loops |
| Input Threshold Accuracy | Trigger = 1.66V, Threshold = 3.3V at VDD = 5V - ensures predictable RC time constants across voltage/temp |
| Output Rise/Fall Time | 20–75ns / 15–60ns (RL = 10MΩ, CL = 10pF) - minimizes jitter in clocked digital interfaces |
Pinout & Package
Package: SOIC-8 (D package), 4.9mm × 6.0mm body size, gull-wing leads, RoHS-compliant, automotive-qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Low-impedance return path for internal comparators, latch, and output stage |
| TRIG (Pin 2) | Start-of-timing input | Active-low edge-sensitive trigger; falling below ~1/3 VDD initiates timing cycle |
| OUT (Pin 3) | High-current output | CMOS rail-to-rail output capable of sourcing 10mA or sinking 100mA |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH low regardless of TRIG/THRES state |
| CONT (Pin 5) | Threshold control | Externally sets comparator reference points; bypass capacitor improves noise immunity |
| THRES (Pin 6) | End-of-timing input | Falling below ~2/3 VDD resets latch and terminates timing interval |
| DISCH (Pin 7) | Timing capacitor discharge | Open-collector output tied to GND when OUT is low - discharges RC network rapidly |
| VDD (Pin 8) | Power supply | Single-supply input supporting 5–15V; internal regulation not required |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail CMOS output | Enables direct interfacing with 3.3V/5V logic families without level-shifting circuitry |
| 1000V HBM ESD protection | Meets ANSI/ESDA/JEDEC JS-001 - eliminates need for external TVS in board-level ESD design |
| Functional NE555 compatibility | Identical pinout and timing behavior - allows drop-in replacement in legacy 555-based designs |
| Low supply current (350µA typ @ 5V) | Reduces quiescent power in battery-backed or energy-constrained automotive modules |
| High input impedance (>100MΩ) | Supports use of high-value timing resistors and small capacitors for improved accuracy and stability |
Applications
| Engine Control Unit Timing | Body Control Module PWM |
|---|---|
|
Use Scenario: Generating precise ignition timing pulses synchronized to crankshaft position signals in gasoline engines. IC Role / Device Role / Timing Role: Monostable timer triggered by Hall-effect sensor edges to produce fixed-duration spark pulses. Use Value: 2.1MHz max frequency and ±5% threshold tolerance ensure sub-microsecond jitter control critical for combustion efficiency. |
Use Scenario: Driving LED clusters and window motor drivers using variable-duty-cycle PWM in vehicle interior lighting and convenience systems. IC Role / Device Role / Timing Role: Astable multivibrator configured with RA/RB/C network to generate adjustable 100Hz–10kHz PWM waveforms. Use Value: 100mA sink capability eliminates external driver transistors, reducing BOM count and PCB area in space-constrained BCMs. |
| Transmission Control Logic | ADAS Sensor Power Sequencing |
|
Use Scenario: Implementing time-delayed shift solenoid actuation sequences during gear transitions to minimize mechanical shock. IC Role / Device Role / Timing Role: Precision monostable delay generator with RESET-initiated retriggering for adaptive response to throttle and speed inputs. Use Value: –40°C to +125°C operation and 1µs minimum pulse width guarantee reliable sequencing across full drivetrain thermal envelope. |
Use Scenario: Controlling power-up/down sequencing of radar and camera sensors to meet ISO 26262 ASIL-B startup timing requirements. IC Role / Device Role / Timing Role: Dual-stage timing controller using cascaded monostable stages to enforce strict voltage ramp delays between sensor rails. Use Value: Low supply current (350µA) and rail-to-rail output reduce dependency on complex PMICs in cost-sensitive ADAS edge nodes. |
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; higher supply current (3–6mA), lower output drive (200mA sink but slower rise/fall), no automotive qualification | Limited to commercial-temp industrial or consumer applications; unsuitable for under-hood deployment | Select only for cost-sensitive non-automotive prototypes where thermal margin and ESD robustness are secondary |
| LMC555IMX/NOPB | CMOS like TLC555QDRG4 but rated for –40°C to +85°C only; identical SOIC-8 pinout and 5–15V operation | Valid for cabin electronics (HVAC, infotainment) but not powertrain or chassis control due to temp range limitation | Choose when automotive qualification is unnecessary and lower-cost sourcing is prioritized over extended temperature support |
Compared with NE555P and LMC555IMX/NOPB, the TLC555QDRG4 uniquely combines AEC-Q100 qualification, 100mA sink capability, and 350µA supply current - making it the only option suitable for timing-critical automotive subsystems operating across full vehicle thermal extremes.
Availability
TLC555QDRG4 is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission controllers, and ADAS sensor sequencers requiring stable component supply with automotive-grade reliability and traceable sourcing.
Supply support for TLC555QDRG4 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 and embedded processing technologies, with decades of automotive IC development expertise and rigorous quality management systems.
The TLC555 product line was engineered specifically for high-reliability timing applications in automotive environments, delivering CMOS efficiency and NE555 compatibility within AEC-Q100-qualified packages.
FAQ
What is the maximum operating temperature for the TLC555QDRG4?
The TLC555QDRG4 is rated for continuous operation from –40°C to +125°C ambient temperature, meeting AEC-Q100 Grade 1 requirements for automotive under-hood applications. This specification is validated across all electrical parameters in the official TI datasheet SLFS043K, including supply current, output drive, and timing accuracy - confirming suitability for engine control and transmission modules where thermal stress is extreme.
Is the TLC555QDRG4 pin-compatible with the NE555?
Yes, the TLC555QDRG4 uses the same 8-pin SOIC footprint and identical pin assignments as the NE555, including GND (1), TRIG (2), OUT (3), RESET (4), CONT (5), THRES (6), DISCH (7), and VDD (8). Texas Instruments explicitly states functional interchangeability and matching pinout in the device description - enabling direct replacement in existing 555-based PCB layouts without redesign.
What is the typical supply current of the TLC555QDRG4 at 5V?
The TLC555QDRG4 draws 180–350µA typical supply current at VDD = 5V and TA = 25°C, as specified in Section 5.6 of the TI datasheet SLFS043K. This ultra-low quiescent current remains stable across the full –40°C to +125°C range, making the TLC555QDRG4 significantly more efficient than bipolar 555 timers (e.g., NE555 draws ~3mA), especially in always-on automotive subsystems.
Can the TLC555QDRG4 drive a 12V relay directly?
Yes - the TLC555QDRG4 can sink up to 100mA at VDD = 15V with a typical on-state voltage of 0.5V, allowing direct driving of small 12V relays (e.g., 120Ω coil, ~100mA hold current) without an external transistor. However, inductive kickback must be suppressed with a flyback diode across the relay coil to protect the DISCH and OUT pins, as confirmed in TI's application guidance for relay interface circuits.
Does the TLC555QDRG4 support astable (oscillator) mode?
Yes, the TLC555QDRG4 fully supports astable operation, as documented in Section 6.3.2 of the TI datasheet. When configured with two external resistors (RA, RB) and one capacitor (C), it generates continuous square-wave output with frequency up to 2.1MHz and duty cycle adjustable from ~5% to 95%, leveraging its high-speed comparators and low-propagation-delay output stage.
TLC555QDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 2.1MHz
- Voltage - Supply:
- 5V ~ 15V
- Current - Supply:
- 360 µA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
TLC555QDRG4 FAQ
1.How can I place an order for TLC555QDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC555QDRG4 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 TLC555QDRG4 reliable?
The price and inventory of TLC555QDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC555QDRG4 is usually 5 days.
3.What payment methods are accepted for TLC555QDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC555QDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC555QDRG4?
TLC555QDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC555QDRG4 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 TLC555QDRG4?
For technical support, including TLC555QDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC555QDRG4 requirements.
6.How does Aetrix verify that TLC555QDRG4 is sourced from the original manufacturer or authorized distributors?
All TLC555QDRG4 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 TLC555QDRG4 meets industry standards.
7.What is the process for return or replacement of TLC555QDRG4?
All TLC555QDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLC555QDRG4, 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 TLC555QDRG4 part is unused and in its original packaging.
Return procedure for TLC555QDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLC555QDRG4 Tags
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