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Texas Instruments NE555DRE4
- Part No.:
- NE555DRE4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NE555DRE4.pdf
- Description:
- IC OSC SGL TIMER 100KHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,464
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Product details
Overview
NE555DRE4 from Texas Instruments is a precision bipolar 555 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 using external R-C networks and is widely used in pulse-shaping, missing-pulse detection, and industrial control circuits.
For engineers reviewing the NE555DRE4 datasheet, NE555DRE4 pinout, NE555DRE4 application, or NE555DRE4 equivalent, this page provides verified functional behavior, SOIC-8 package details, confirmed electrical characteristics at 25°C and across temperature, and real-world implementation guidance for monostable/astable configurations.
Technical Context
The NE555DRE4 implements a bipolar transistor-based architecture with two comparators, an SR latch, and a push-pull output stage. Its internal resistor divider sets fixed trigger (≈⅓ VCC) and threshold (≈⅔ VCC) reference levels, modifiable via the CONT pin. The DISCH terminal provides open-collector discharge control for capacitor timing networks.
Timing accuracy depends on external R-C component tolerances and is affected by supply-voltage sensitivity (0.1–0.5%/V in monostable mode) and temperature coefficient (50 ppm/°C). Output switching is characterized by rise/fall times of 100–300 ns into 15 pF load at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 16 V - supports standard TTL and CMOS logic supply rails without level shifting |
| Output Drive Capability | ±200 mA - enables direct driving of relays, LEDs, or small solenoids without external buffers |
| Timing Range | 10 µs to >10,000 s - determined solely by external RA, RB, and C values; no internal oscillator |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for office, consumer, and non-automotive industrial environments |
| Trigger Threshold | ≈⅓ VCC - precise comparator reference enabling repeatable edge-triggered monostable timing |
| Threshold Level | ≈⅔ VCC - defines upper timing boundary in astable operation and enables duty-cycle control with RA/RB |
| Reset Input Logic | Active-low asynchronous reset - forces output low and DISCH on regardless of TRIG/THRES states |
Pinout & Package
NE555DRE4 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, surface-mount footprint, and standard JEDEC MS-012AC dimensions (4.9 mm × 3.9 mm × 1.75 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground node | Return path for all internal bias currents and external timing network; must be low-impedance |
| TRIG (Pin 2) | Start-of-timing input | Active-low edge-sensitive input; triggers monostable output high when voltage falls below ≈⅓ VCC |
| OUT (Pin 3) | High-current output | Push-pull stage delivering ±200 mA; compatible with TTL inputs at VCC = 5 V |
| RESET (Pin 4) | Asynchronous reset | Forces output low and DISCH on when pulled low; unused pins must tie to VCC |
| CONT (Pin 5) | Threshold reference control | Overrides internal ⅔ VCC divider; allows external voltage modulation of timing thresholds |
| THRES (Pin 6) | End-of-timing input | Resets output low when voltage exceeds ≈⅔ VCC; determines timing interval end in monostable mode |
| DISCH (Pin 7) | Timing capacitor discharge | Open-collector NPN output tied to GND when OUT is low; discharges external timing capacitor |
| VCC (Pin 8) | Positive supply rail | Power input for internal comparators, latch, and output stage; requires local 0.01 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable duty cycle in astable mode | Independent control via RA (charge path) and RB (discharge path), enabling 55%–95% waveform duty cycles |
| On-chip voltage divider | Three 5 kΩ resistors set precise ⅓ and ⅔ VCC thresholds-eliminates need for external references |
| High-output current drive | 200 mA sink/source capability allows direct interface with electromechanical loads without driver transistors |
| Reset override functionality | Asynchronous active-low RESET pin ensures deterministic state recovery independent of TRIG/THRES timing |
| Controllable timing thresholds | CONT pin accepts external DC or AC signals to dynamically shift trigger/threshold levels for PWM/PPM applications |
Applications
| Missing-Pulse Detection | Pulse-Width Modulation |
|---|---|
Use Scenario: Monitoring serial data streams or clock lines where loss of expected pulses indicates communication failure or sensor fault. IC Role / Device Role / Timing Role: Monostable timer retriggered by each valid input pulse; output goes high only when inter-pulse gap exceeds programmed delay. Use Value: Detects faults without microcontroller intervention; timing interval set precisely by RA×C (e.g., 100 µs to 100 ms) with <50 ppm/°C drift. | Use Scenario: Generating variable-duty-cycle control signals for motor speed regulation or LED brightness adjustment using analog control voltage. IC Role / Device Role / Timing Role: Monostable configured with CONT pin modulated by external analog signal, altering trigger threshold to vary output pulse width. Use Value: Achieves analog-controlled PWM with simple R-C network; avoids digital DAC and firmware overhead while maintaining linearity within ±10% over 10:1 range. |
| Sequential Timing Control | Industrial Timer Relay |
Use Scenario: Power-up sequencing in embedded systems requiring staggered enable signals for FPGAs, memory, and peripherals. IC Role / Device Role / Timing Role: Cascaded astable-monostable stages where output of first timer triggers second, creating precise time-ordered event chains. Use Value: Eliminates need for multi-channel programmable timers; each NE555DRE4 adds ~100 ms to sequence with <1% tolerance using 1% resistors and NP0 capacitors. | Use Scenario: On/off control of HVAC actuators, conveyor belts, or lighting systems in factory automation panels. IC Role / Device Role / Timing Role: Astable oscillator driving relay driver transistor; output toggles power to load at user-defined frequency and duty cycle. Use Value: Replaces mechanical time-delay relays with solid-state reliability; 200 mA output directly drives 5 V coil relays or interfaces via ULN2003 for 24 V loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM555CDR | Bipolar 555 with identical pinout and electrical specs; same SOIC-8 package; ±200 mA drive, 4.5–16 V supply | No difference in monostable/astable use cases; identical timing equations and thermal performance | Select when dual-sourcing required or TI's NE555DRE4 is unavailable; full functional and layout compatibility |
| TLC555CDR | CMOS version with 2 V–15 V supply, 100 µA quiescent current, and rail-to-rail output swing; lower drive (10 mA) | Superior for battery-powered or low-power systems; unsuitable for direct relay/LED drive due to limited output current | Choose for ultra-low-power or wide-VCC designs where 200 mA drive is unnecessary; requires level-shifting for TTL loads at 3.3 V |
Compared with LM555CDR, NE555DRE4 offers identical timing behavior and drop-in replacement capability; versus TLC555CDR, it trades higher quiescent current for robust output drive and legacy TTL compatibility-critical in industrial relay and pulse-generation roles.
Availability
NE555DRE4 is available at Aetrix Electronics and suitable for industrial controls, pulse-shaping circuits, and missing-pulse detectors requiring stable component supply across extended production lifecycles.
Supply support for NE555DRE4 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 NE555DRE4 belongs to TI's legacy precision timer product line, engineered for robust, low-cost, discrete-component-based timing solutions in commercial-grade industrial and consumer systems.
FAQ
What is the maximum output current capability of the NE555DRE4?
The NE555DRE4 provides ±200 mA output drive capability at VCC = 15 V, enabling direct connection to relays, LEDs, or small solenoids. At VCC = 5 V, it sustains ±100 mA while maintaining TTL-compatible logic levels. This specification is validated per TI SLFS022K datasheet Section 5.5 under recommended operating conditions and applies to both sourcing and sinking modes.
Can the NE555DRE4 operate from a 3.3 V supply?
No, the NE555DRE4 is not specified for 3.3 V operation. Its minimum recommended supply voltage is 4.5 V per Section 5.3 of the TI SLFS022K datasheet. At 3.3 V, internal comparators fail to switch reliably, and output voltage margins fall outside TTL thresholds. For 3.3 V systems, consider the TLC555CDR CMOS variant instead.
How does the CONT pin affect timing accuracy in the NE555DRE4?
The CONT pin on the NE555DRE4 directly overrides the internal ⅔ VCC threshold reference. Applying an external voltage here shifts both trigger and threshold levels proportionally, enabling analog modulation of timing intervals. However, noise or impedance mismatch on CONT degrades timing stability-TI recommends bypassing it with a 0.01 µF capacitor to GND for critical applications.
What is the minimum monostable pulse width achievable with the NE555DRE4?
The shortest reliable monostable pulse width for the NE555DRE4 is 10 µs, limited by internal comparator storage time when TRIG is grounded. This value is confirmed in Section 6.3.1 of the TI SLFS022K datasheet. Achieving shorter pulses requires external edge-shaping circuitry or migration to a high-speed timer like the LMC555.
Is the NE555DRE4 pin-compatible with the original Signetics NE555?
Yes, the NE555DRE4 maintains full pin-to-pin and functional compatibility with the original Signetics NE555 and all industry-standard 555 variants (e.g., LM555, SA555). Its SOIC-8 footprint matches D-package devices, and all electrical parameters-including trigger threshold, output drive, and timing equations-are identical per TI's characterization against the legacy specification.
NE555DRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
NE555DRE4 FAQ
1.How can I place an order for NE555DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NE555DRE4 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 NE555DRE4 reliable?
The price and inventory of NE555DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NE555DRE4 is usually 5 days.
3.What payment methods are accepted for NE555DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NE555DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NE555DRE4?
NE555DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NE555DRE4 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 NE555DRE4?
For technical support, including NE555DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NE555DRE4 requirements.
6.How does Aetrix verify that NE555DRE4 is sourced from the original manufacturer or authorized distributors?
All NE555DRE4 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 NE555DRE4 meets industry standards.
7.What is the process for return or replacement of NE555DRE4?
All NE555DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with NE555DRE4, 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 NE555DRE4 part is unused and in its original packaging.
Return procedure for NE555DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NE555DRE4 Tags
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