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Texas Instruments NE555D
- Part No.:
- NE555D
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NE555D.pdf
- Description:
- IC OSC SGL TIMER 100KHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,730
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Product details
Overview
NE555D from Texas Instruments is a general-purpose precision timer IC operating in monostable or astable mode, delivering timing intervals from microseconds to hours with ±1.5% initial timing error at 25°C, 5–15 V supply range, and TTL-compatible output capable of sinking or sourcing up to 200 mA - widely used in pulse generation, missing-pulse detection, and PWM circuits.
For engineers reviewing the NE555D datasheet, NE555D pinout, NE555D application, or NE555D equivalent, key selection considerations include its 8-pin SOIC (D) package, reset-override capability, adjustable duty cycle via dual-resistor control, discharge transistor for capacitor timing, and compatibility with legacy 555-based designs requiring industrial-grade temperature stability (0°C to 70°C).
Technical Context
The NE555D integrates two comparators, an SR flip-flop, and a high-current output stage with open-collector discharge transistor. Its internal voltage divider sets nominal trigger (⅓ VCC) and threshold (⅔ VCC) reference levels, which are directly scalable with supply voltage - enabling supply-independent timing intervals in both mono- and astable configurations.
Reset input overrides trigger and threshold inputs, forcing output low and enabling discharge path activation. The CONT pin allows external modulation of internal reference voltages, supporting pulse-width and pulse-position modulation without external op-amps or DACs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 16 V - supports standard TTL and CMOS logic rails; enables direct interface with 5 V microcontrollers and 12 V industrial supplies. |
| Output Current Drive | ±200 mA - sufficient to drive LEDs, relays, small solenoids, or logic inputs without external buffers. |
| Timing Accuracy (Initial) | ±1.5% typ. at 25°C - ensures predictable delay or frequency without calibration in cost-sensitive consumer and industrial timers. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade applications including office equipment, test instruments, and educational kits. |
| Trigger Threshold | ≈⅓ VCC - defines start-of-timing point; stable across temperature and supply, enabling robust edge-triggered behavior. |
| Threshold Level | ≈⅔ VCC - defines end-of-timing point; matched to trigger level for consistent hysteresis and noise immunity. |
| Discharge Transistor | Open-collector NPN - provides low-impedance path to GND during timing discharge phase, enabling precise RC timing networks. |
Pinout & Package
NE555D is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 6.20 mm × 5.30 mm, optimized for automated PCB assembly and space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal circuitry and external timing components; must be low-impedance for stable operation. |
| TRIG (Pin 2) | Timing start input | Active-low input; falling edge below ≈⅓ VCC initiates monostable timing or resets astable cycle. |
| OUT (Pin 3) | High-current output | Push-pull stage delivering TTL-compatible logic levels and up to 200 mA sink/source - drives loads directly. |
| RESET (Pin 4) | Asynchronous reset | Active-low override; forces OUT low and DISCH on regardless of TRIG/THRES states - enables emergency stop or retriggering. |
| CONT (Pin 5) | Control voltage input | Access to internal voltage divider node; allows external adjustment of trigger/threshold levels for modulation or precision tuning. |
| THRES (Pin 6) | Timing end input | Falling edge above ≈⅔ VCC terminates monostable interval or controls astable discharge timing. |
| DISCH (Pin 7) | Discharge switch output | Open-collector NPN transistor tied to GND when active - discharges external timing capacitor in astable mode. |
| VCC (Pin 8) | Positive supply | Power input for internal comparators, flip-flop, and output stage; decoupling capacitor required near pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Monostable & astable operation | Single IC supports both one-shot delay generation (via R+C) and free-running oscillation (via RA+RB+C), reducing BOM count. |
| Adjustable duty cycle | Astable mode uses independent RA (charge) and RB (discharge) resistors - enables 50%–99% duty cycle tuning without external logic. |
| TTL-compatible output | Output swings rail-to-rail with <0.4 V low-level and >12.5 V high-level at 15 V supply - interfaces directly with 74LS, 74HC, and microcontroller GPIOs. |
| Reset override function | Asynchronous RESET pin forces immediate output low and activates DISCH - critical for safety interlocks and synchronized multi-stage timing. |
| External modulation support | CONT pin accepts DC or AC signals (0–VCC) to dynamically shift internal thresholds - enables analog PWM, PPM, and VCO functionality without extra ICs. |
Applications
| Missing-Pulse Detection | Pulse-Width Modulation |
|---|---|
|
Use Scenario: Monitoring serial data streams or encoder outputs where loss of expected pulse indicates fault or stall. IC Role / Device Role / Timing Role: Monostable timer re-triggered by each incoming pulse; output goes high only when inter-pulse gap exceeds RC time constant. Use Value: Detects signal interruptions as short as 10 µs using passive R/C network - no firmware or CPU overhead required. |
Use Scenario: Generating variable-duty-cycle control signals for motor speed, LED brightness, or power converter regulation. IC Role / Device Role / Timing Role: Monostable configured with modulated CONT pin; timing interval varies with analog control voltage amplitude. Use Value: Achieves analog-controlled PWM with single NE555D and one potentiometer - eliminates need for dedicated PWM IC or microcontroller DAC. |
| Sequential Timing Control | Industrial Oscillator Reference |
|
Use Scenario: Coordinating multi-step processes in vending machines, packaging lines, or lab equipment with fixed time delays. IC Role / Device Role / Timing Role: Cascaded NE555D units where output of first stage triggers next - creates precise, repeatable timing sequences. Use Value: Enables deterministic multi-stage timing with <±3% total error over temperature - avoids software timing jitter or crystal oscillator cost. |
Use Scenario: Providing stable clock or trigger signals in test fixtures, sensor excitation circuits, or analog function generators. IC Role / Device Role / Timing Role: Astable configuration generating 1 Hz–100 kHz square waves with user-adjustable frequency and duty cycle. Use Value: Delivers low-jitter, temperature-stable oscillation using only two resistors and one capacitor - replaces crystal oscillator + divider in non-critical timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM555CN | Same pinout and core functionality; wider supply range (4.5 V–18 V); higher max output current (225 mA); slightly looser initial timing accuracy (±2%). | Preferred for 18 V systems or higher-current loads; less suitable where tight initial timing tolerance is mandatory. | Select LM555CN when operating above 16 V or driving >200 mA loads; verify thermal dissipation in high-duty-cycle astable use. |
| SE555DR | Extended temperature range (–55°C to 125°C); tighter timing drift (±100 ppm/°C vs NE555D's ±150 ppm/°C); same SOIC-8 package. | Required for aerospace, automotive under-hood, or military applications; over-specified for commercial indoor use. | Choose SE555DR only when full military-grade temperature performance is validated necessary; otherwise NE555D offers optimal cost/performance balance. |
Compared with LM555CN and SE555DR, the NE555D delivers the best combination of commercial-grade reliability, proven design heritage, and cost efficiency for applications operating between 0°C and 70°C at 5–16 V - making it the de facto standard for education, prototyping, and mid-volume industrial timers.
Availability
NE555D is available at Aetrix Electronics and suitable for missing-pulse detection, pulse-width modulation, and sequential timing control requiring stable component supply, long-term lifecycle support, and consistent electrical performance across production batches.
Supply support for NE555D 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 with over 50 years of analog IC innovation, serving industrial, automotive, and consumer markets with high-reliability, production-qualified components.
The NE555D belongs to TI's legacy xx555 precision timer family - designed specifically for robust, low-cost, discrete-component-replacement timing functions in commercial-grade electronic systems.
FAQ
What is the maximum supply voltage for NE555D?
The NE555D supports a recommended operating supply voltage range of 4.5 V to 16 V. Absolute maximum rating is 18 V, but sustained operation above 16 V risks exceeding thermal limits and degrading long-term reliability. For 18 V systems, consider the SE555 variant instead.
Can NE555D drive a relay directly?
Yes, the NE555D can drive small to medium electromagnetic relays directly: its output sinks or sources up to 200 mA at 15 V, sufficient for coils rated ≤150 mA. Always include a flyback diode across the relay coil to suppress inductive kickback and protect the NE555D discharge transistor.
Does NE555D require external components to operate?
Yes, the NE555D requires external timing components: at minimum, one resistor and one capacitor for monostable mode, or two resistors and one capacitor for astable mode. A 0.01 µF bypass capacitor on the CONT pin and 0.1 µF decoupling capacitor on VCC are also strongly recommended for stable operation.
How does the RESET pin function on NE555D?
The RESET pin on NE555D is active-low and asynchronous: pulling it low forces the output (OUT) immediately low and activates the discharge transistor (DISCH), overriding all other inputs. When unused, RESET must be tied to VCC to prevent spurious triggering - floating is not permitted.
Is NE555D compatible with modern microcontroller GPIOs?
Yes, NE555D is fully compatible: its output is TTL-compatible (0.4 V low, ≥2.7 V high at 5 V supply), matching 5 V microcontroller logic levels. For 3.3 V MCUs, use a level-shifter or ensure the MCU input accepts 5 V-tolerant signals - direct connection may damage non-5 V-tolerant I/O pins.
NE555D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 100kHz
- Voltage - Supply:
- 4.5V ~ 16V
- Current - Supply:
- 10 mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
NE555D FAQ
1.How can I place an order for NE555D through Aetrix?
Please submit a Request for Quotation (RFQ) for NE555D 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 NE555D reliable?
The price and inventory of NE555D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NE555D is usually 5 days.
3.What payment methods are accepted for NE555D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NE555D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NE555D?
NE555D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NE555D 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 NE555D?
For technical support, including NE555D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NE555D requirements.
6.How does Aetrix verify that NE555D is sourced from the original manufacturer or authorized distributors?
All NE555D 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 NE555D meets industry standards.
7.What is the process for return or replacement of NE555D?
All NE555D units undergo pre-shipment inspection (PSI). If there is an issue with NE555D, 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 NE555D part is unused and in its original packaging.
Return procedure for NE555D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NE555D Tags
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