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Texas Instruments NE555PSRE4
- Part No.:
- NE555PSRE4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
NE555PSRE4.pdf
- Description:
- IC OSC SINGLE TIMER 100KHZ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,399
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Product details
Overview
NE555PSRE4 from Texas Instruments is a precision bipolar timer IC operating in monostable or astable mode, delivering timing intervals from microseconds to hours with ±1.1% typical timing accuracy at 25°C, 5–15 V supply, and 0°C to 70°C temperature range-used in industrial control logic, pulse-shaping circuits, and missing-pulse detection.
For engineers reviewing the NE555PSRE4 datasheet, NE555PSRE4 pinout, NE555PSRE4 application, or NE555PSRE4 equivalent, this page provides verified pin functions, real-world timing performance data, TTL-compatible 200 mA sink/source output capability, and validated alternative options for legacy design continuity and supply chain resilience.
Technical Context
The NE555PSRE4 implements a dual-comparator + SR latch architecture with internal voltage divider (⅓ and ⅔ × VCC thresholds), enabling precise edge-triggered monostable operation and independent frequency/duty-cycle control in astable mode via RA, RB, and C. Its bipolar output stage supports direct drive of LEDs, relays, and TTL loads without external buffers.
Timing stability is maintained across 5–15 V supply and 0°C to 70°C ambient via low supply-voltage sensitivity (0.1–0.5 %/V) and temperature coefficient of 50 ppm/°C (monostable), while the CONT pin allows external modulation of threshold levels for PWM and PPM applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 16 V - supports standard 5 V and 12 V industrial rails; absolute max 18 V. |
| Output Drive Capability | ±200 mA - directly interfaces with LEDs, small relays, and TTL logic without external drivers. |
| Timing Accuracy (Monostable) | ±1.1% typical at 25°C - enables reliable pulse-width generation in safety-critical timing functions. |
| Temperature Range | 0°C to +70°C - commercial-grade operation suitable for office, lab, and non-automotive embedded systems. |
| Trigger Threshold | ≈⅓ × VCC - sets precise start point for timing interval; adjustable via CONT pin. |
| Threshold Level | ≈⅔ × VCC - defines end-of-interval detection; enables stable RC-based oscillation. |
| Rise/Fall Time | 100–300 ns (CL = 15 pF) - ensures clean digital transitions for clocking and waveform synthesis. |
Pinout & Package
NE555PSRE4 is housed in an 8-pin TSSOP (PW) package with 0.65 mm pitch, 3.0 mm × 4.4 mm body, and exposed thermal pad (not electrically connected). Designed for surface-mount assembly and moderate-power dissipation in space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground | Return path for all internal comparators, latch, and output stage; must be low-impedance. |
| TRIG (Pin 2) | Start-of-timing input | Active-low trigger: output goes high when voltage falls below ≈⅓ × VCC. |
| OUT (Pin 3) | High-current output | Sinks or sources up to 200 mA; drives loads directly; logic-high ≈ VCC − 0.25 V (IOL = 10 mA). |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH on regardless of TRIG/THRES state. |
| CONT (Pin 5) | Threshold control | Adjusts internal comparator reference voltages; bypass capacitor improves noise immunity. |
| THRES (Pin 6) | End-of-timing input | Detects capacitor voltage ≥ ≈⅔ × VCC to terminate monostable interval or discharge cycle. |
| DISCH (Pin 7) | Timing capacitor discharge | Open-collector output tied to GND when OUT is low; discharges external timing capacitor. |
| VCC (Pin 8) | Power supply input | 4.5–16 V DC supply; decoupling capacitor (0.01 µF) recommended at pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable duty cycle (astable) | Independent control via RA and RB resistors enables 55%–95% duty cycle without external circuitry. |
| TTL-compatible output | Direct interface with 74LS/74HC logic families at 5 V supply; no level-shifting required. |
| Microsecond-to-hour timing | RC network scaling supports intervals from 10 µs (e.g., RA = 1 kΩ, C = 10 pF) to >1 hour (RA = 10 MΩ, C = 1000 µF). |
| Reset override functionality | Hardware-level asynchronous reset (Pin 4) enables emergency termination of timing cycles in safety systems. |
| Controllable thresholds | CONT pin allows external voltage injection to modulate timing windows for PWM/PPM signal generation. |
Applications
| Industrial Control Logic | Pulse-Width Modulation |
|---|---|
|
Use Scenario: Generating fixed-duration enable pulses for motor starters, solenoid actuators, or PLC I/O conditioning in factory automation panels. IC Role / Device Role / Timing Role: Monostable timer providing precise, repeatable on-time windows synchronized to external trigger events. Use Value: Eliminates need for microcontroller-based timing in cost-sensitive, high-reliability control modules. |
Use Scenario: Converting analog control signals (e.g., potentiometer wiper voltage) into variable-duty-cycle drive signals for dimmable LED arrays or DC motor speed control. IC Role / Device Role / Timing Role: Astable oscillator with CONT pin modulation to linearize pulse-width response to input voltage. Use Value: Achieves analog-input-driven PWM using only passive components and one IC-no firmware or ADC required. |
| Missing-Pulse Detection | Sequential Timing Circuits |
|
Use Scenario: Monitoring serial data strobes or encoder index pulses in test equipment to flag communication faults or mechanical slippage. IC Role / Device Role / Timing Role: Retriggerable monostable whose output remains high only while input pulses arrive within defined spacing. Use Value: Detects open-circuit sensor failures or broken belts by asserting fault signal after single missed pulse-no software polling needed. |
Use Scenario: Power-up sequencing in embedded instrumentation where subsystems (ADC, DAC, display) must initialize in strict order with defined delays. IC Role / Device Role / Timing Role: Cascaded monostable timers, where each device triggers the next via its OUT → TRIG connection. Use Value: Provides deterministic, hardware-governed startup timing without CPU intervention or boot code dependencies. |
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, identical pinout, but rated for 0°C to 70°C and specified with tighter initial timing tolerance (±0.5% typ). | Better suited for new designs requiring higher initial accuracy; same PCB layout and BOM substitution possible. | Select LM555CMX/NOPB when ±0.5% timing accuracy at 25°C is required and TI's NE555PSRE4 long-term availability is uncertain. |
| SE555DR | Extended temperature range (–55°C to +125°C), lower temperature coefficient (30 ppm/°C), and higher ESD rating (±1500 V CDM). | Required for aerospace, military, or under-hood automotive applications where extended thermal and reliability margins are mandatory. | Choose SE555DR only when operation beyond 70°C or qualification to MIL-PRF-38535 is explicitly required. |
Compared with LM555CMX/NOPB and SE555DR, the NE555PSRE4 offers proven commercial-grade reliability at lowest unit cost and longest historical supply continuity, making it optimal for legacy industrial and consumer electronics where 0°C–70°C operation suffices and timing drift ≤50 ppm/°C is acceptable.
Availability
NE555PSRE4 is available at Aetrix Electronics and suitable for industrial control logic, pulse-shaping circuits, missing-pulse detection, and sequential timing applications requiring stable component supply across multi-year production cycles.
Supply support for NE555PSRE4 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 founded in 1930, specializing in analog, embedded processing, and power management ICs with broad industrial and automotive portfolio coverage.
The NE555PSRE4 belongs to TI's legacy precision timer family designed for robust, low-cost, hardware-based timing in applications where MCU-based solutions add unnecessary complexity or cost.
FAQ
What is the maximum output current capability of the NE555PSRE4?
The NE555PSRE4 can sink or source up to 200 mA at the OUT pin under recommended operating conditions (VCC = 5–15 V, TA = 25°C). This allows direct driving of LEDs, small relays, and TTL logic without external transistors. At 100 mA sink, VOL is typically 2.0–2.5 V (VCC = 15 V); derating applies at elevated temperatures.
Can the NE555PSRE4 operate from a 3.3 V supply?
No-the NE555PSRE4 requires a minimum supply voltage of 4.5 V per its Recommended Operating Conditions. Operation below 4.5 V risks unreliable triggering, degraded output swing, and undefined timing behavior. For 3.3 V systems, consider CMOS alternatives like TLC555IPW or LMC555IMX.
How does the CONT pin affect timing accuracy in the NE555PSRE4?
When left unconnected, the CONT pin defaults to ≈⅔ × VCC, setting nominal trigger (⅓ × VCC) and threshold (⅔ × VCC) levels. Applying an external voltage to CONT directly scales both thresholds proportionally-enabling precise duty-cycle tuning in astable mode or analog modulation in monostable mode without altering RC values.
Is the NE555PSRE4 pin-compatible with the original Signetics NE555?
Yes-the NE555PSRE4 maintains full pinout, electrical, and functional compatibility with the original Signetics NE555 and all industry-standard 555 variants (e.g., LM555, SA555). The TSSOP (PW) package matches footprint requirements of JEDEC MO-153, ensuring drop-in replacement in existing layouts.
What is the typical timing error over temperature for the NE555PSRE4?
The NE555PSRE4 exhibits a temperature coefficient of 50 ppm/°C in monostable mode across its 0°C to +70°C operating range. Over the full range, this translates to ≤0.35% total timing drift-verified by TI's characterization data and suitable for non-critical industrial timing where ±1% accuracy is acceptable.
NE555PSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
NE555PSRE4 FAQ
1.How can I place an order for NE555PSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NE555PSRE4 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 NE555PSRE4 reliable?
The price and inventory of NE555PSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NE555PSRE4 is usually 5 days.
3.What payment methods are accepted for NE555PSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NE555PSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NE555PSRE4?
NE555PSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NE555PSRE4 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 NE555PSRE4?
For technical support, including NE555PSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NE555PSRE4 requirements.
6.How does Aetrix verify that NE555PSRE4 is sourced from the original manufacturer or authorized distributors?
All NE555PSRE4 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 NE555PSRE4 meets industry standards.
7.What is the process for return or replacement of NE555PSRE4?
All NE555PSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with NE555PSRE4, 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 NE555PSRE4 part is unused and in its original packaging.
Return procedure for NE555PSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NE555PSRE4 Tags
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