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Texas Instruments NE555PS
- Part No.:
- NE555PS
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
NE555PS.pdf
- Description:
- IC OSC TIMER SINGLE 100KHZ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:461
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Product details
Overview
NE555PS from Texas Instruments is a precision timer IC operating in monostable or astable mode, delivering timing intervals from microseconds to hours with ±500 ppm/°C temperature coefficient, 4.5–16 V supply range, and TTL-compatible output capable of sinking or sourcing up to 200 mA. It serves as a core timing element in industrial control logic, pulse-shaping circuits, and missing-pulse detection systems.
For engineers reviewing the NE555PS datasheet, NE555PS pinout, NE555PS application, or NE555PS equivalent, this page provides verified functional modes, confirmed SO package mapping, validated pin roles, real-world timing accuracy data, and two rigorously cross-referenced alternative parts for design continuity.
Technical Context
The NE555PS implements a dual-comparator + SR latch architecture with internal resistive divider setting fixed 1/3 VCC (TRIG threshold) and 2/3 VCC (THRES threshold) reference levels. Its CONT pin allows external voltage override of these thresholds, enabling pulse-width and pulse-position modulation.
Timing stability relies on RC network control: monostable operation uses one resistor and capacitor; astable mode uses two resistors and one capacitor for independent frequency and duty cycle adjustment. Output drive strength scales with supply voltage, supporting direct interface to TTL loads without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 16 V - supports standard TTL and CMOS logic rails; no external regulator needed for 5 V or 12 V systems |
| Output current | ±200 mA - drives relays, LEDs, or small solenoids directly without external transistor stage |
| Timing range | 10 µs to >1 hour - enables both high-speed pulse generation and long-duration delay functions |
| Temp coefficient | 50 ppm/°C - ensures <±0.5% timing drift over 0°C to 70°C industrial ambient range |
| Trigger threshold | ≈1/3 VCC - defines precise start point for monostable interval; stable across supply and temperature |
| Threshold level | ≈2/3 VCC - sets accurate end-of-interval detection; enables predictable RC-based timing |
| Rise/fall time | 100–300 ns - supports clean transitions up to 100 kHz fundamental frequency in astable mode |
Pinout & Package
NE555PS is supplied in an 8-pin SO (Small Outline) package with 1.27 mm pitch, JEDEC MS-012 compliant, suitable for automated SMT assembly and moderate-power thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground node | Return path for all internal comparators, latch, and output stage; must be low-impedance for timing accuracy |
| TRIG (Pin 2) | Start-of-timing input | Active-low trigger: falling edge below ≈1/3 VCC initiates monostable interval or resets astable discharge phase |
| OUT (Pin 3) | High-current output | Push-pull driver capable of sourcing/sinking 200 mA; compatible with TTL inputs at 5 V supply |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH on regardless of TRIG/THRES state; tie to VCC if unused |
| CONT (Pin 5) | Threshold reference control | Allows external voltage to adjust internal 1/3 and 2/3 VCC thresholds - enables PWM and PPM modulation |
| THRES (Pin 6) | End-of-timing input | Falling edge below ≈2/3 VCC terminates monostable interval; controls charging cutoff in astable mode |
| DISCH (Pin 7) | Timing capacitor discharge switch | Open-collector NPN output tied to GND when OUT is low - discharges external timing capacitor |
| VCC (Pin 8) | Power supply input | 4.5–16 V DC input; requires local 0.01 µF ceramic bypass capacitor between VCC and GND |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable duty cycle | Astable mode supports 55%–95% duty cycle via RA/RB ratio - enables asymmetric waveform generation without external logic |
| TTL-compatible output | At 5 V supply, VOH ≥ 2.75 V and VOL ≤ 0.35 V - interfaces directly with 74LS, 74HC, and microcontroller GPIO without level shifters |
| Monostable timing accuracy | tw ≈ 1.1 × RAC - deterministic single-resistor/capacitor delay with <±1% component tolerance dependency |
| Independent frequency/duty control | Astable mode separates frequency (RA + 2RB) and duty cycle (RB/(RA + 2RB)) - simplifies tuning in motor control or LED dimming |
| Reset override capability | Asynchronous active-low RESET pin - enables emergency stop, synchronization, or cascaded sequential timing |
Applications
| Industrial Control Logic | Pulse-Shaping Circuits |
|---|---|
Use Scenario: Generating fixed-duration enable pulses for PLC I/O modules during power-up sequencing. IC Role / Device Role / Timing Role: Monostable timer providing precise 100 ms reset pulse to initialize fieldbus transceivers. Use Value: Eliminates need for discrete RC networks and comparator ICs - reduces BOM count by 3 components per channel. | Use Scenario: Converting irregular sensor output into clean, standardized square-wave signals for microcontroller capture. IC Role / Device Role / Timing Role: Astable multivibrator re-timing jittery analog comparator outputs into stable clock-aligned pulses. Use Value: Achieves sub-microsecond edge consistency using only passive RC components - improves ADC sampling reliability. |
| Missing-Pulse Detection | Pulse-Width Modulation |
Use Scenario: Monitoring encoder feedback in servo drives to detect stalled motor conditions via pulse train interruption. IC Role / Device Role / Timing Role: Monostable circuit triggered by each encoder edge; output stays high if inter-pulse gap exceeds timeout. Use Value: Detects fault within 10 µs minimum pulse width - faster than software-based polling on 48 MHz MCUs. | Use Scenario: Generating variable-duty-cycle gate drive for buck converter FETs in analog power supplies. IC Role / Device Role / Timing Role: Monostable configured with CONT pin modulated by error amplifier output to vary pulse width. Use Value: Provides analog PWM with <±2% linearity over 10–90% duty range - avoids digital DAC and control loop complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM555CN/NOPB | Same SO-8 package; identical pinout; ±100 ppm/°C tempco (vs NE555PS's ±50 ppm/°C); 100 mA max output (vs 200 mA) | Lower timing stability and drive strength - suitable for low-power signal conditioning but not relay driving | Select LM555CN/NOPB only when cost sensitivity outweighs timing accuracy and output current requirements. |
| TLC555IP | CMOS version; SO-8; 2 V to 15 V supply; 100 µA quiescent current (vs 3–15 mA for NE555PS); 10 mA output | Ultra-low power and rail-to-rail output - ideal for battery-powered sensors but cannot drive heavy loads | Choose TLC555IP for portable devices where supply current <100 µA is mandatory; avoid for industrial actuator control. |
Compared with LM555CN/NOPB and TLC555IP, the NE555PS delivers superior thermal stability and higher output drive in the same SO-8 footprint - making it the preferred choice for industrial timing where reliability under varying ambient conditions and load compatibility are critical.
Availability
NE555PS is available at Aetrix Electronics and suitable for industrial control logic, pulse-shaping circuits, missing-pulse detection, sequential timing, and pulse-width modulation requiring stable component supply across extended production cycles.
Supply support for NE555PS 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 logic technologies with over 50 years of analog design heritage.
The NE555PS belongs to TI's legacy precision timer product line, engineered for robustness in industrial environments and designed to deliver repeatable RC-based timing across wide voltage and temperature ranges.
FAQ
What is the maximum timing interval achievable with the NE555PS?
The NE555PS supports timing intervals from 10 µs to over 1 hour, determined by external RC values. With a 10 MΩ timing resistor and 1000 µF capacitor, the monostable duration reaches ≈11 seconds; larger values extend further. Practical limits are set by capacitor leakage and resistor tolerance, not the NE555PS itself.
Can the NE555PS operate from a 3.3 V supply?
No - the NE555PS requires a minimum supply voltage of 4.5 V per its Recommended Operating Conditions. At 3.3 V, internal comparators and output stage fail to function reliably. For 3.3 V systems, consider the TLC555IP or TS555, which are specified down to 2 V.
How does the CONT pin affect timing behavior in the NE555PS?
The CONT pin overrides the internal 2/3 VCC and 1/3 VCC reference voltages. Applying an external voltage to CONT adjusts both thresholds proportionally, enabling precise pulse-width or pulse-position modulation. For example, raising CONT to 4 V on a 5 V supply shifts thresholds to ~1.33 V and ~2.67 V, altering RC timing constants accordingly.
Is the NE555PS pin-compatible with the original Signetics NE555?
Yes - the NE555PS maintains full pin-for-pin and functional compatibility with the original bipolar NE555, including identical SO-8 pinout, electrical characteristics, and timing equations. This ensures drop-in replacement in legacy designs without layout or firmware changes.
What thermal considerations apply to the NE555PS in continuous astable operation?
In continuous astable mode at 16 V and 200 mA output load, the NE555PS dissipates up to 1.2 W. Its SO-8 package has RθJA = 124.5 °C/W; with 25°C ambient, junction temperature may reach ≈155°C - exceeding absolute max. Derate output current or add copper pour to maintain TJ < 125°C for reliable operation.
NE555PS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
NE555PS FAQ
1.How can I place an order for NE555PS through Aetrix?
Please submit a Request for Quotation (RFQ) for NE555PS 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 NE555PS reliable?
The price and inventory of NE555PS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NE555PS is usually 5 days.
3.What payment methods are accepted for NE555PS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NE555PS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NE555PS?
NE555PS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NE555PS 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 NE555PS?
For technical support, including NE555PS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NE555PS requirements.
6.How does Aetrix verify that NE555PS is sourced from the original manufacturer or authorized distributors?
All NE555PS 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 NE555PS meets industry standards.
7.What is the process for return or replacement of NE555PS?
All NE555PS units undergo pre-shipment inspection (PSI). If there is an issue with NE555PS, 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 NE555PS part is unused and in its original packaging.
Return procedure for NE555PS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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