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Texas Instruments NE555PW
- Part No.:
- NE555PW
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
NE555PW.pdf
- Description:
- IC OSC SGL TIMER 100KHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:960
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Product details
Overview
NE555PW from Texas Instruments is a precision bipolar timer IC operating in monostable or astable mode, with 0°C to 70°C temperature range, 4.5V–16V supply voltage, and TTL-compatible output capable of sinking or sourcing up to 200mA. It delivers timing intervals from microseconds to hours and supports adjustable duty cycle in oscillator configurations for industrial control and pulse-shaping applications.
For engineers reviewing the NE555PW datasheet, NE555PW pinout, NE555PW application, or NE555PW equivalent, key selection criteria include its TSSOP-8 package footprint, 200mA output drive strength, ±200mA output current rating, 50 ppm/°C temperature coefficient in monostable mode, and compatibility with standard 555 external RC timing networks.
Technical Context
The NE555PW 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 ~⅓ VCC and ~⅔ VCC respectively. The CONT pin allows direct adjustment of these thresholds via external voltage.
In monostable operation, timing is set by one resistor and capacitor (tW ≈ 1.1 × RAC); in astable mode, frequency and duty cycle are independently controlled using two resistors and one capacitor (f ≈ 1.44 / [(RA + 2RB)C], duty ≈ (RA + RB) / (RA + 2RB)).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 16V - supports standard 5V and 12V logic rails without level shifting |
| Output Drive Capability | ±200mA - directly drives relays, LEDs, or logic gates without external buffers |
| Timing Accuracy (Monostable) | 50 ppm/°C - ensures stable pulse width over commercial temperature range |
| Trigger Threshold | ≈⅓ VCC - enables predictable start-of-timing detection across supply variations |
| Threshold Voltage | ≈⅔ VCC - defines end-of-timing point with minimal hysteresis |
| Propagation Delay | 100–300 ns - supports reliable operation up to 100kHz free-running frequency |
| Supply Current (No Load) | 2–15 mA - scales with VCC and output state, enabling low-power standby design |
Pinout & Package
TSSOP-8 (PW) package: 3mm × 4.4mm body, 0.65mm pitch, exposed pad optional, RoHS-compliant, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for all internal currents and external timing network |
| TRIG (Pin 2) | Start-of-timing input | Active-low edge-triggered input; <⅓ VCC initiates monostable cycle or resets astable discharge phase |
| OUT (Pin 3) | High-current output | Push-pull stage delivering ±200mA; logic-high = VCC − 0.25V (at 10mA), logic-low = 0.15V (at 8mA) |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH on regardless of TRIG/THRES states |
| CONT (Pin 5) | Threshold control | Direct access to internal divider node; bypass capacitor improves noise immunity and stability |
| THRES (Pin 6) | End-of-timing input | Input monitoring capacitor voltage; >⅔ VCC terminates monostable interval or triggers astable discharge |
| 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) | Positive supply | Power input for internal comparators, latch, and output driver; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable duty cycle in astable mode | Enables precise waveform shaping using RA and RB - no external logic needed for variable mark-space ratio |
| TTL-compatible output | Direct interface with 74LS/74HC logic families at 5V supply without level translation |
| Wide timing range (μs to hours) | Single RC network supports time constants from 10μs to >10,000s - eliminates need for multiple timer ICs |
| Reset override functionality | Hardware-level abort of active timing cycle - critical for safety-critical or fault-recovery systems |
| Controllable threshold voltage | External voltage on CONT pin shifts both trigger and threshold levels - enables voltage-controlled timing or modulation |
Applications
| Industrial Control Sequencing | Pulse-Width Modulation (PWM) |
|---|---|
Use Scenario: Generating timed enable signals for motor starters, solenoid actuators, or conveyor belt stages in factory automation. IC Role / Device Role / Timing Role: Monostable timer providing fixed-duration gate pulses synchronized to system clock or sensor event. Use Value: Eliminates microcontroller dependency for basic sequencing; 200mA output drives PLC input modules directly. | Use Scenario: Converting analog control voltage into variable-duty-cycle square wave for LED dimming or DC motor speed control. IC Role / Device Role / Timing Role: Astable timer with modulated CONT pin, where analog input alters threshold voltage to vary output pulse width. Use Value: Achieves analog-to-PWM conversion with only one IC and passive components - no DAC or MCU required. |
| Missing-Pulse Detection | Frequency Division |
Use Scenario: Monitoring encoder or tachometer pulse trains to detect stalled motors or broken belts in motion systems. IC Role / Device Role / Timing Role: Monostable circuit retriggered by each input pulse; missing pulse allows full timeout → fault flag generation. Use Value: Provides hardware-level fault detection with sub-millisecond response - immune to software crashes or interrupt latency. | Use Scenario: Deriving lower-frequency clock signals (e.g., 1Hz from 1kHz) for real-time clocks or status indicators. IC Role / Device Role / Timing Role: Monostable configured with precise RC values to generate one output pulse per N input edges. Use Value: Delivers deterministic integer division using analog timing - avoids counter overflow or synchronization issues in digital dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM555CMX/NOPB | Same bipolar architecture, SOIC-8 package, identical pinout, but rated for 0°C to 70°C with slightly higher supply current (3–15 mA vs. 2–15 mA) | No functional difference in monostable/astable circuits; minor quiescent current variance irrelevant in most timing designs | Select LM555CMX/NOPB if SOIC-8 footprint is preferred over TSSOP-8; same timing equations and layout rules apply |
| TLC555IP | CMOS version with rail-to-rail output, 2V–15V supply, 100μA typical supply current, but only 15mA output drive | Lower power and wider supply range, but insufficient drive for relays or high-current loads without buffering | Choose TLC555IP for battery-powered or low-noise applications where 15mA output suffices; avoid for direct relay/LED driving |
Compared with LM555CMX/NOPB, NE555PW offers identical timing behavior in a smaller TSSOP-8 package with equal drive strength; versus TLC555IP, NE555PW provides 13× higher output current at the cost of higher quiescent power - making it preferable for industrial actuator interfaces.
Availability
NE555PW is available at Aetrix Electronics and suitable for industrial control sequencing, pulse-width modulation, missing-pulse detection, and frequency division requiring stable component supply across production volumes.
Supply support for NE555PW 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 designing analog, embedded processing, and logic products for industrial, automotive, and communications markets.
The NE555PW belongs to TI's legacy precision timer product line, engineered for robust, low-cost, discrete-component-based timing solutions in commercial-grade equipment where reliability and ease of use outweigh ultra-low power or high-speed requirements.
FAQ
What is the maximum output current capability of the NE555PW?
The NE555PW provides ±200mA output current capability - meaning it can sink up to 200mA when the output is low and source up to 200mA when high. This is verified under recommended operating conditions (VCC = 15V, TA = 25°C) and allows direct driving of small relays, LEDs, or logic inputs without external transistors. At 5V supply, output voltage drop remains within 0.4V at 8mA load, preserving TTL compatibility.
Can the NE555PW operate from a 3.3V supply?
No, the NE555PW is not specified for 3.3V operation. Its recommended supply range is 4.5V to 16V, with minimum functional voltage of 4.5V. Below this, internal comparator thresholds (⅓ VCC and ⅔ VCC) fall outside guaranteed switching margins, and output drive degrades significantly. For 3.3V systems, consider CMOS alternatives like the TLC555IP, which operates down to 2V.
How does the CONT pin affect NE555PW timing behavior?
The CONT pin on the NE555PW connects directly to the internal voltage divider node between the two comparators. Applying an external voltage to CONT adjusts both the trigger threshold (~⅓ VCC becomes ~⅓ × CONT) and threshold voltage (~⅔ VCC becomes ~⅔ × CONT), enabling voltage-controlled timing, pulse-width modulation, or pulse-position modulation. A 0.01μF capacitor to ground is recommended to reduce noise sensitivity.
Is the NE555PW pin-compatible with other 555 variants like the SE555 or NA555?
Yes, the NE555PW shares identical pinout and electrical behavior with all members of the 555 family in D (SOIC), P (PDIP), PS (SO), and PW (TSSOP) packages - including NA555, SA555, and SE555. Differences lie solely in temperature rating (NE555PW: 0°C to 70°C), absolute max ratings, and thermal characteristics - not pin function or timing equations.
What is the minimum monostable pulse width achievable with the NE555PW?
The minimum monostable pulse width for the NE555PW is approximately 10μs. This limitation arises from internal comparator storage time when TRIG is grounded - the device requires at least 10μs for the trigger comparator to recover before reliably detecting the next edge. For shorter intervals, consider high-speed timers like the LMC555 or dedicated one-shot ICs.
NE555PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
NE555PW FAQ
1.How can I place an order for NE555PW through Aetrix?
Please submit a Request for Quotation (RFQ) for NE555PW 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 NE555PW reliable?
The price and inventory of NE555PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NE555PW is usually 5 days.
3.What payment methods are accepted for NE555PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NE555PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NE555PW?
NE555PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NE555PW 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 NE555PW?
For technical support, including NE555PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NE555PW requirements.
6.How does Aetrix verify that NE555PW is sourced from the original manufacturer or authorized distributors?
All NE555PW 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 NE555PW meets industry standards.
7.What is the process for return or replacement of NE555PW?
All NE555PW units undergo pre-shipment inspection (PSI). If there is an issue with NE555PW, 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 NE555PW part is unused and in its original packaging.
Return procedure for NE555PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NE555PW Tags
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