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Texas Instruments NA555PG4
- Part No.:
- NA555PG4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
NA555PG4.pdf
- Description:
- IC OSC SINGLE TIMER 100KHZ 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
NA555PG4 from Texas Instruments is a precision bipolar 555 timer IC configured for monostable or astable timing operation, with 8-pin PDIP package, ±200mA output drive capability, 4.5V–16V supply range, and –40°C to +105°C operating temperature-used in industrial pulse-shaping, missing-pulse detection, and PWM circuits.
For engineers reviewing the NA555PG4 datasheet, NA555PG4 pinout, NA555PG4 application, or NA555PG4 equivalent, key selection factors include its TTL-compatible output stage, adjustable duty cycle via dual-resistor control, thermal stability (50 ppm/°C timing coefficient), and reset override functionality critical for robust timing recovery in embedded control systems.
Technical Context
The NA555PG4 implements a bipolar transistor-based architecture with two comparators, an SR latch, and a push-pull output stage driving up to 200mA. Its internal resistor divider sets fixed trigger (≈⅓ VCC) and threshold (≈⅔ VCC) reference levels, modifiable via the CONT pin.
Timing intervals are determined by external RC networks: monostable mode uses one resistor and capacitor (tw ≈ 1.1 × RAC); astable mode uses two resistors and one capacitor to independently adjust frequency and duty cycle (f ≈ 1.44 / [(RA + 2RB)C]).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5V to 16V - supports direct interface with 5V TTL and 12V industrial logic without level shifting |
| Output current | ±200mA - drives relays, LEDs, or MOSFET gates directly without external buffers |
| Operating temperature | –40°C to +105°C - qualified for under-hood automotive and industrial ambient environments |
| Timing coefficient | 50 ppm/°C - ensures stable pulse duration across full temperature range in precision delay applications |
| Supply sensitivity | 0.1–0.5 %/V - minimal timing drift over input voltage variation, enabling reliable operation with unregulated supplies |
| Propagation delay | 100–300 ns - fast response to trigger/reset edges for sub-microsecond timing resolution |
| Reset function | Active-low asynchronous override - forces output low and discharge on regardless of TRIG/THRES state |
Pinout & Package
NA555PG4 is supplied in an 8-pin plastic dual in-line package (PDIP), with 0.3-inch body width and standard through-hole mounting footprint compatible with legacy PCB layouts and manual prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal circuitry and external timing components |
| TRIG (Pin 2) | Start-of-timing input | Active-low edge-triggered input; falling below ≈⅓ VCC initiates monostable cycle or resets astable period |
| OUT (Pin 3) | High-current output | Push-pull stage capable of sourcing/sinking up to 200mA; TTL-logic compatible at 5V |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH on independent of TRIG/THRES states |
| CONT (Pin 5) | Threshold control | Direct access to internal ⅔ VCC node; bypass capacitor improves noise immunity and enables voltage modulation |
| THRES (Pin 6) | End-of-timing input | Monitors timing capacitor voltage; rising above ≈⅔ VCC terminates monostable interval or triggers discharge in astable mode |
| DISCH (Pin 7) | Discharge switch | Open-collector NPN output tied to GND when OUT is low; discharges external timing capacitor |
| VCC (Pin 8) | Power supply | Positive supply rail (4.5V–16V); powers internal comparators, latch, and output driver |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable duty cycle | Independent control via RA and RB resistors in astable mode enables precise waveform shaping for motor control or lighting dimming |
| TTL-compatible output | Drives standard 74LS loads directly at 5V supply, eliminating need for interface logic in mixed-signal systems |
| Microsecond-to-hour timing | RC network scalability supports delays from 10µs to >1 hour-ideal for watchdog timers and sequential power-up circuits |
| Reset override capability | Hardware-level forced reset ensures deterministic state recovery in safety-critical timing sequences |
| Supply voltage independence | Timing interval remains stable across VCC variations due to proportional internal reference generation |
Applications
| Industrial Pulse-Shaping | Missing-Pulse Detection |
|---|---|
Use Scenario: Generating clean, jitter-free trigger pulses for PLC I/O modules and sensor signal conditioning. IC Role / Device Role / Timing Role: Monostable timer generating fixed-duration output pulses synchronized to noisy industrial inputs. Use Value: Eliminates false triggering from EMI by requiring sustained low-level TRIG assertion, leveraging internal hysteresis and reset override. | Use Scenario: Monitoring encoder or communication clock streams for fault conditions in CNC machinery. IC Role / Device Role / Timing Role: Self-retriggering monostable whose timeout period exceeds maximum valid pulse spacing. Use Value: Generates diagnostic flag on first missed pulse-no microcontroller required, reducing BOM cost and firmware complexity. |
| Pulse-Width Modulation | Sequential Power-Up Control |
Use Scenario: Analog-controlled LED dimming or DC motor speed regulation using simple op-amp or potentiometer input. IC Role / Device Role / Timing Role: Astable oscillator with CONT pin modulated by external analog voltage to vary duty cycle. Use Value: Achieves smooth brightness/speed control without digital PWM generation or DAC hardware-only passive RC and modulation source needed. | Use Scenario: Staggered enable sequencing for multi-rail power supplies in FPGA or DSP subsystems. IC Role / Device Role / Timing Role: Cascaded monostable timers where each NA555PG4 output triggers the next stage's TRIG input. Use Value: Guarantees minimum inter-rail delay (e.g., 100ms between 12V, 5V, and 3.3V rails) using only discrete timing components-no software or CPLD required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE555P | 0°C to +70°C operating range; identical pinout, electrical specs, and functional behavior | Not rated for extended temperature industrial or automotive use | Select NE555P only for commercial-grade applications with ambient temperatures strictly within 0–70°C |
| SA555P | –40°C to +85°C rating; otherwise electrically and physically identical to NA555PG4 | Limited to industrial environments without extreme thermal stress (e.g., non-under-hood automotive) | Choose SA555P where full –40°C to +105°C range is unnecessary but extended temperature support beyond NE555 is required |
Compared with NE555P and SA555P, NA555PG4 provides the widest operational temperature range (–40°C to +105°C) while maintaining identical timing accuracy, output drive, and pin compatibility-making it the preferred choice for thermally demanding industrial controls and automotive subsystems.
Availability
NA555PG4 is available at Aetrix Electronics and suitable for industrial pulse-shaping, missing-pulse detection, and sequential power-up control requiring stable component supply across extended temperature ranges.
Supply support for NA555PG4 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 broad industrial and automotive qualification expertise.
The NA555PG4 belongs to TI's precision bipolar timer product line, designed specifically for robust, low-cost, high-reliability timing functions in harsh environments where microcontroller-based solutions are over-engineered or cost-prohibitive.
FAQ
What is the maximum output current capability of the NA555PG4?
The NA555PG4 can sink or source up to ±200mA at the OUT pin when VCC = 15V, and maintains ±100mA capability at VCC = 5V. This allows direct driving of small relays, LEDs, or logic-level MOSFET gates without external buffer stages. The actual output voltage swing depends on load current and supply voltage, with low-level output voltage ≤0.4V at 100mA and high-level output voltage ≥12.5V at 15V supply.
Can the NA555PG4 operate from a 3.3V supply?
No, the NA555PG4 is not specified for 3.3V operation. Its recommended operating supply range is 4.5V to 16V. At 3.3V, internal comparator thresholds and output drive fall outside guaranteed specifications, resulting in unreliable triggering, incomplete discharge, or failure to reach TTL logic-high levels. For 3.3V systems, consider CMOS alternatives like TLC555CP.
How does the CONT pin affect timing accuracy in the NA555PG4?
The CONT pin connects directly to the internal ⅔ VCC voltage divider node. Applying an external voltage here alters both trigger (⅓ CONT) and threshold (⅔ CONT) reference levels, enabling voltage-controlled timing or modulation. However, injecting noise or high-impedance signals degrades timing stability-TI recommends bypassing CONT to GND with a 10nF ceramic capacitor unless actively modulating.
Is the NA555PG4 pin-compatible with other 555 variants like NE555 or SA555?
Yes, the NA555PG4 shares identical 8-pin PDIP pinout and electrical behavior with NE555P, SA555P, and SE555P. All exhibit the same trigger/threshold thresholds, output drive, and functional truth table. Differences are limited to temperature rating and minor parametric shifts-no PCB layout changes are needed when substituting within the same package type.
What is the minimum monostable pulse width achievable with the NA555PG4?
The minimum guaranteed monostable pulse width for NA555PG4 is 10µs, limited by internal comparator storage time when TRIG is grounded. This occurs because the trigger comparator requires up to 10µs to recover after being driven fully low. For shorter intervals, external Schmitt-trigger conditioning or CMOS timers (e.g., TLC555) are recommended.
NA555PG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- 555 Type, Timer/Oscillator (Single)
- Count:
- -
- Frequency:
- 100kHz
- Voltage - Supply:
- 4.5V ~ 16V
- Current - Supply:
- 10 mA
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
NA555PG4 FAQ
1.How can I place an order for NA555PG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NA555PG4 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 NA555PG4 reliable?
The price and inventory of NA555PG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NA555PG4 is usually 5 days.
3.What payment methods are accepted for NA555PG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NA555PG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NA555PG4?
NA555PG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NA555PG4 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 NA555PG4?
For technical support, including NA555PG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NA555PG4 requirements.
6.How does Aetrix verify that NA555PG4 is sourced from the original manufacturer or authorized distributors?
All NA555PG4 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 NA555PG4 meets industry standards.
7.What is the process for return or replacement of NA555PG4?
All NA555PG4 units undergo pre-shipment inspection (PSI). If there is an issue with NA555PG4, 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 NA555PG4 part is unused and in its original packaging.
Return procedure for NA555PG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NA555PG4 Tags
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NE555DR
Texas Instruments
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SA555DR
Texas Instruments
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NA555DR
Texas Instruments
-
SE555DR
Texas Instruments
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NE555P
Texas Instruments
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CD4541BM96
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CD4541BE
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TLC555QDR
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TLC555IDR
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TLC555QDRQ1
Texas Instruments
-
TPL5010DDCR
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TLC555CP
Texas Instruments
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