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Texas Instruments NE555DRG4
- Part No.:
- NE555DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NE555DRG4.pdf
- Description:
- IC OSC SGL TIMER 100KHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,814
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Product details
Overview
NE555DRG4 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 0–70°C temperature range. It drives TTL-compatible loads up to 200 mA sink/source and serves as a core timing element in pulse-shaping, missing-pulse detection, and industrial control circuits.
For engineers reviewing the NE555DRG4 datasheet, NE555DRG4 pinout, NE555DRG4 application, or NE555DRG4 equivalent, this page provides verified functional behavior, validated pin roles, confirmed thermal and switching specs, and real-world implementation constraints - all specific to the SOIC-8 (D) package variant of NE555DRG4.
Technical Context
The NE555DRG4 implements a dual-comparator + SR latch architecture with internal resistive divider setting fixed 1/3 VCC trigger and 2/3 VCC threshold reference levels. Its discharge transistor (open-collector DISCH) and push-pull output stage enable direct capacitor charging/discharging and high-current drive without external buffers.
Timing stability relies on RC network interaction with internal comparators; supply-voltage sensitivity is ≤0.5%/V in monostable mode and ≤0.3%/V in astable mode, while temperature coefficient is 50 ppm/°C over 0–70°C - consistent with its commercial-grade specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 16 V - supports standard 5 V TTL and 12 V industrial rails without level shifting |
| Output current | ±200 mA - directly drives relays, LEDs, or logic gates without external transistors |
| Timing range | 10 µs to >1 hour - enabled by single R-C (monostable) or dual-R + C (astable) configuration |
| Trigger threshold | ≈1/3 × VCC - sets precise start point for timing interval independent of supply drift |
| Threshold level | ≈2/3 × VCC - defines end-of-interval detection with built-in hysteresis |
| Operating temp | 0°C to +70°C - qualified for commercial ambient environments only |
| Rise/fall time | 100–300 ns - enables reliable operation up to 100 kHz fundamental frequency |
Pinout & Package
NE555DRG4 is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 3.9 mm width, and surface-mount compatibility. Pin functions are electrically identical across D, P, PS, and PW packages per TI SLFS022K.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground | Return path for internal comparators, latch, and output stage; must be low-impedance |
| TRIG (Pin 2) | Start-of-timing input | Active-low edge-triggered input; <1/3 VCC initiates monostable cycle or resets astable low phase |
| OUT (Pin 3) | High-current output | Push-pull driver capable of sourcing/sinking 200 mA; TTL-compatible at 5 V |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH on regardless of TRIG/THRES state |
| CONT (Pin 5) | Threshold reference adjust | Exposes 2/3 VCC node; bypass capacitor reduces noise; external voltage modifies trigger/threshold levels |
| THRES (Pin 6) | End-of-timing input | Monitors capacitor voltage; >2/3 VCC terminates monostable interval or triggers astable discharge phase |
| DISCH (Pin 7) | Timing capacitor discharge | Open-collector NPN switch 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 decoupling near pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable duty cycle | Astable mode allows independent control of high/low time via RA and RB resistors - enables custom waveform generation |
| TTL-compatible output | Drives standard 74LS logic directly at 5 V supply without interface circuitry |
| Internal voltage reference | Firm 1/3 and 2/3 VCC thresholds eliminate need for external precision references |
| Reset override capability | Pin 4 provides hard reset independent of timing state - critical for safety-critical or fault-recovery systems |
| Low quiescent current | 3–6 mA at 5 V supply with no load - suitable for battery-backed timing applications |
Applications
| Missing-Pulse Detection | Pulse-Width Modulation |
|---|---|
Use Scenario: Monitoring serial data streams or encoder outputs where absence of expected pulses indicates communication failure or mechanical stall. IC Role / Device Role / Timing Role: Monostable timer retriggered by each valid input pulse; output goes high only upon missing-pulse timeout. Use Value: Detects faults within 10 µs minimum pulse width using single NE555DRG4 and passive RC network - no microcontroller required. | Use Scenario: Generating variable-duty-cycle drive signals for analog dimming of LEDs or motor speed control in cost-sensitive consumer devices. IC Role / Device Role / Timing Role: Monostable configured with CONT pin modulated by analog signal to vary output pulse width dynamically. Use Value: Achieves 10–90% duty cycle adjustment using simple op-amp or potentiometer on CONT - avoids digital PWM complexity. |
| Pulse-Position Modulation | Industrial Sequential Timing |
Use Scenario: Encoding sensor data onto timing position of periodic pulses for noise-immune transmission over long cables in factory automation. IC Role / Device Role / Timing Role: Astable oscillator with CONT pin voltage-modulated to shift zero-crossing timing of output waveform. Use Value: Delivers sub-microsecond timing resolution shift via 0–VCC analog input - leverages inherent RC linearity for analog-to-time conversion. | Use Scenario: Power-up sequencing of multi-rail power supplies or staged activation of test equipment subsystems requiring strict temporal order. IC Role / Device Role / Timing Role: Cascaded monostable timers where output of first triggers second, enabling precise delay chaining. Use Value: Provides deterministic, jitter-free delays up to hours per stage using only passive components - eliminates firmware dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM555CN/NOPB | Same bipolar architecture, PDIP-8 only; 0–70°C rating; slightly higher supply current (4–8 mA at 5 V) | No SOIC option; less suitable for automated SMT assembly | Select if through-hole prototyping or legacy board reuse is required |
| TLC555CDR | CMOS version; lower supply current (100 µA typical); rail-to-rail output; 2–15 V supply | Better for battery-powered or high-frequency (>100 kHz) designs; not pin-compatible due to different DISCH behavior | Select for ultra-low-power or wide-supply applications where bipolar drive strength is not needed |
Compared with LM555CN/NOPB, NE555DRG4 offers SOIC-8 packaging for modern PCB assembly, while TLC555CDR trades drive strength for power efficiency and supply flexibility - neither is pin-compatible, but both serve overlapping timing functions with distinct trade-offs.
Availability
NE555DRG4 is available at Aetrix Electronics and suitable for industrial controls, pulse-shaping circuits, and missing-pulse detectors requiring stable component supply across production lifecycles.
Supply support for NE555DRG4 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 NE555DRG4 belongs to TI's legacy precision timer product line, engineered for robust, low-cost, discrete-component-based timing solutions in commercial-grade instrumentation and control systems.
FAQ
What is the maximum operating supply voltage for NE555DRG4?
The absolute maximum supply voltage for NE555DRG4 is 18 V, but recommended operation is limited to 4.5 V to 16 V per TI SLFS022K. Exceeding 16 V risks exceeding absolute maximum ratings and may cause permanent damage. At 15 V, NE555DRG4 delivers full 200 mA output drive and maintains timing accuracy within 50 ppm/°C over 0–70°C.
Can NE555DRG4 operate from a 3.3 V supply?
No - NE555DRG4 is not specified for 3.3 V operation. Its minimum recommended supply is 4.5 V, and internal comparator thresholds (≈1/3 and 2/3 VCC) fall below valid logic levels at 3.3 V. For 3.3 V systems, consider CMOS alternatives like TLC555CDR or LMC555IMX/NOPB, which are explicitly characterized down to 2 V.
Is NE555DRG4 pin-compatible with the original Signetics NE555?
Yes - NE555DRG4 is a direct functional and pin-for-pin replacement for the original Signetics NE555 and all second-source 555 timers in SOIC-8 (D) package. Pin numbering, electrical behavior, timing equations, and thermal limits match TI's published specifications for NE555 family devices.
What is the minimum monostable pulse width achievable with NE555DRG4?
The minimum monostable pulse width for NE555DRG4 is 10 µs, dictated by internal comparator storage time when TRIG is grounded. This limit holds across the full 0–70°C range and 4.5–16 V supply. Shorter intervals require high-speed alternatives such as the TLC555 or dedicated one-shot ICs.
Does NE555DRG4 require a bypass capacitor on the CONT pin?
A 0.01 µF ceramic capacitor from CONT (Pin 5) to GND is strongly recommended to suppress noise-induced false triggering, especially in electrically noisy environments. While NE555DRG4 will function without it, omission increases susceptibility to EMI and supply ripple affecting timing accuracy - TI's application notes explicitly cite this as a best practice for stable operation.
NE555DRG4 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:
- -
NE555DRG4 FAQ
1.How can I place an order for NE555DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NE555DRG4 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 NE555DRG4 reliable?
The price and inventory of NE555DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NE555DRG4 is usually 5 days.
3.What payment methods are accepted for NE555DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NE555DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NE555DRG4?
NE555DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NE555DRG4 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 NE555DRG4?
For technical support, including NE555DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NE555DRG4 requirements.
6.How does Aetrix verify that NE555DRG4 is sourced from the original manufacturer or authorized distributors?
All NE555DRG4 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 NE555DRG4 meets industry standards.
7.What is the process for return or replacement of NE555DRG4?
All NE555DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with NE555DRG4, 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 NE555DRG4 part is unused and in its original packaging.
Return procedure for NE555DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NE555DRG4 Tags
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NE555DR
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SA555DR
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NE555P
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CD4541BE
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TLC555QDR
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TLC555IDR
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TPL5010DDCR
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TLC555CP
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