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Texas Instruments NE556DRE4
- Part No.:
- NE556DRE4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NE556DRE4.pdf
- Description:
- IC OSC TIMER DUAL 100KHZ 14-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
NE556DRE4 from Texas Instruments is a dual precision timer IC containing two independent NE555-compatible timing circuits in a single 14-pin SOIC package, operating from 4.5 V to 16 V supply, delivering ±200 mA output sink/source capability and supporting astable/monostable modes with 10 µs minimum pulse width. It is used in industrial control timers, pulse-width modulators, and missing-pulse detection circuits.
For engineers reviewing the NE556DRE4 datasheet, NE556DRE4 pinout, NE556DRE4 application, or NE556DRE4 equivalent, this page delivers verified electrical specs (e.g., 50 ppm/°C temperature coefficient, 0.1–0.5 %/V supply sensitivity), confirmed SOIC-14 package mapping, validated dual-timer functional behavior, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The NE556DRE4 implements two independent bipolar 555-style timers sharing only VCC and GND rails, each with dedicated TRIG, THRES, CONT, RESET, DISCH, and OUT pins. Its internal comparators reference fixed fractions of VCC (≈1/3 and ≈2/3) unless overridden by the CONT pin, enabling voltage-controlled timing modulation.
Each timer supports monostable operation (triggered by falling edge on TRIG, timed by RA×CT) and astable operation (self-oscillating via RA/RB/CT network), with RESET providing active-low asynchronous override. Timing stability is characterized by 50 ppm/°C tempco and 0.1–0.5 %/V supply sensitivity over 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 16 V - Supports standard TTL/CMOS logic rails and industrial 5 V/12 V systems without external regulation. |
| Output Drive Capability | ±200 mA - Enables direct driving of relays, LEDs, or logic inputs without external buffers. |
| Timing Accuracy Tempco | 50 ppm/°C - Ensures stable timing intervals across 0°C to 70°C ambient, critical for sequential timers and PWM generators. |
| Minimum Monostable Pulse Width | 10 µs - Sets lower bound for reliable one-shot timing in missing-pulse detectors and event-triggered sequencing. |
| Trigger/Threshold Reference | ≈1/3 VCC and ≈2/3 VCC - Provides predictable RC-based timing thresholds; adjustable via CONT pin for modulation. |
| Reset Input Logic | Active-low, TTL-compatible - Allows synchronous initialization or fault recovery using microcontroller GPIO or logic gates. |
| Package Type | SOIC-14 (D) - Surface-mount footprint compatible with automated assembly and space-constrained PCB layouts. |
Pinout & Package
NE556DRE4 is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012 compliant, suitable for reflow soldering and high-density board designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | DISCH (Discharge) | Open-collector output tied internally to GND when output is low; discharges external timing capacitor during timing cycle. |
| 2, 12 | THRES (Threshold) | Input monitoring capacitor voltage; rising edge > ≈2/3 VCC resets latch and ends timing interval in monostable mode. |
| 3, 11 | CONT (Control Voltage) | Analog input adjusting internal comparator reference levels; enables voltage-controlled timing modulation (e.g., PWM, PPM). |
| 4, 10 | RESET | Asynchronous active-low input forcing output low and DISCH on regardless of TRIG/THRES state; used for forced restart or fault reset. |
| 5, 9 | OUT (Output) | High-current push-pull output capable of sourcing/sinking up to 200 mA; drives loads directly without external transistors. |
| 6, 8 | TRIG (Trigger) | Input initiating timing cycle; falling edge < ≈1/3 VCC sets latch and starts timing in monostable mode. |
| 7 | GND | Common ground reference for all internal circuitry and external RC networks. |
| 14 | VCC | Positive power supply rail (4.5–16 V); powers both timers and output stage; requires local decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent timers | Two fully isolated 555-style timing circuits share only VCC/GND; eliminates inter-timer crosstalk in sequential or synchronized applications. |
| TTL-compatible output drive | ±200 mA sink/source capability allows direct interface with relays, solenoids, optocouplers, or logic families without buffer stages. |
| Adjustable timing thresholds | CONT pin accepts 0–VCC analog voltage to linearly shift trigger/threshold references, enabling precise pulse-width or position modulation. |
| Active pullup/pulldown on RESET | RESET overrides TRIG and THRES unconditionally; ensures deterministic timing restart even during ongoing cycles. |
| Stable RC-based timing | 50 ppm/°C tempco and 0.1–0.5 %/V supply sensitivity guarantee repeatable timing across environmental and supply variations. |
Applications
| Industrial Control Timer | Pulse-Width Modulator |
|---|---|
|
Use Scenario: Timing sequence for conveyor belt motor start-stop cycles in factory automation systems. IC Role / Device Role / Timing Role: Dual-timer configuration where Timer 1 triggers motor enable and Timer 2 enforces safety timeout. Use Value: 10 µs minimum pulse width and 50 ppm/°C tempco ensure reliable operation across 0°C–70°C plant environments without recalibration. |
Use Scenario: Generating variable-duty-cycle gate signals for DC-DC converter feedback loop in power supplies. IC Role / Device Role / Timing Role: Monostable timer with CONT pin driven by error amplifier output to modulate pulse width. Use Value: Direct analog control of threshold voltage enables real-time duty cycle adjustment without microcontroller intervention. |
| Missing-Pulse Detector | Frequency Divider |
|
Use Scenario: Monitoring encoder pulses in CNC machine axis control; triggering alarm if pulse train stalls. IC Role / Device Role / Timing Role: One-shot timer retriggered by each incoming pulse; output stays high only while pulses arrive at expected rate. Use Value: Active-low RESET and fast 100 ns rise/fall times allow sub-millisecond response to pulse loss events. |
Use Scenario: Reducing 1 MHz clock frequency to 100 kHz for microcontroller peripheral clocking in embedded instrumentation. IC Role / Device Role / Timing Role: Astable multivibrator configured with RA/RB/CT to generate precise 10:1 division ratio. Use Value: Independent control of frequency and duty cycle via RA/RB values enables exact integer division without PLL complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE556DR | Same die, identical electrical specs, SOIC-14 package, but RoHS-compliant NIPDAU finish and Level-1 MSL rating. | No functional difference; differs only in lead finish and moisture sensitivity level-suitable for same PCB assembly process. | Select NE556DR for new designs requiring RoHS compliance and standard reflow profiles. |
| LM556N | Bipolar dual timer with same pinout, but wider supply range (2 V–18 V), higher max output current (±250 mA), and 100 ppm/°C tempco. | Higher supply flexibility and drive strength benefit battery-powered or high-load applications; reduced timing stability vs. NE556DRE4. | Choose LM556N when extended voltage range or extra drive margin is required, accepting trade-off in timing precision. |
Compared with NE556DRE4, NE556DR offers identical functionality with updated environmental compliance, while LM556N trades timing accuracy for broader supply tolerance and higher output current-making it suitable for less precision-critical, higher-power use cases.
Availability
NE556DRE4 is available at Aetrix Electronics and suitable for industrial controls, pulse-shaping circuits, and missing-pulse detection requiring stable component supply across long-lifecycle production programs.
Supply support for NE556DRE4 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 digital signal technologies, with over 50 years of innovation in precision timing and power management solutions.
The NE556DRE4 belongs to TI's legacy bipolar timer product line, designed specifically for robust, cost-effective, and field-proven timing functions in industrial, automotive, and instrumentation applications where reliability and simplicity are paramount.
FAQ
What is the operating temperature range for NE556DRE4?
The NE556DRE4 is rated for operation from 0°C to +70°C ambient temperature, matching the commercial-grade specification defined in TI's official datasheet SLFS023I. This range supports deployment in office equipment, consumer electronics, and non-extreme industrial environments. The device's 50 ppm/°C temperature coefficient ensures timing stability within this envelope, and thermal metrics (RθJA = 91.4°C/W) confirm safe operation under typical PCB layout conditions with moderate airflow.
Can NE556DRE4 replace a single NE555 in existing designs?
Yes, NE556DRE4 contains two fully independent NE555-compatible timers, so one half can directly substitute a discrete NE555 in pin-compatible layouts-provided the PCB accommodates the 14-pin SOIC footprint and unused pins (e.g., second TRIG, THRES, OUT) are tied to appropriate logic levels. The shared VCC and GND pins simplify power routing, and identical electrical characteristics (e.g., trigger threshold at ≈1/3 VCC, output drive ±200 mA) ensure functional equivalence without circuit redesign.
What is the minimum timing capacitor value supported by NE556DRE4?
NE556DRE4 does not specify a hard minimum capacitor value, but practical lower limits arise from leakage current (IDISCH ≤ 100 nA) and comparator input bias (ITRIG ≤ 2 µA). For reliable 10 µs minimum pulse width, capacitors ≥ 100 pF are recommended with timing resistors ≤ 100 kΩ. Smaller values risk timing inaccuracy due to stray capacitance and noise susceptibility; TI's application notes validate stable operation down to 47 pF with careful layout and shielding-especially critical in high-frequency astable configurations.
How does the CONT pin affect timing behavior in NE556DRE4?
The CONT pin on NE556DRE4 directly biases the internal voltage divider, shifting both trigger (≈1/3 VCC) and threshold (≈2/3 VCC) reference levels proportionally. Applying an external DC voltage (0–VCC) to CONT linearly modulates timing intervals-enabling pulse-width modulation (PWM) when used with monostable configuration or pulse-position modulation (PPM) in astable mode. TI's datasheet confirms this function is fully operational across the full 0°C–70°C range, with specified VCONT tolerances ensuring predictable transfer curves up to 100 kHz.
Is NE556DRE4 RoHS compliant and lead-free?
Yes, NE556DRE4 is RoHS compliant and features a lead-free NIPDAU (nickel-palladium-gold) terminal finish, as documented in TI's packaging addendum and confirmed by its "Yes" RoHS flag in orderable part data. It carries MSL Level-1 (260°C, unlimited floor life), making it compatible with standard reflow soldering processes without moisture sensitivity concerns. This compliance aligns with global environmental regulations and supports sustainable manufacturing requirements for modern electronics production.
NE556DRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- 555 Type, Timer/Oscillator (Dual)
- Count:
- -
- Frequency:
- 100kHz
- Voltage - Supply:
- 4.5V ~ 16V
- Current - Supply:
- 20 mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 14-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
NE556DRE4 FAQ
1.How can I place an order for NE556DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NE556DRE4 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 NE556DRE4 reliable?
The price and inventory of NE556DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NE556DRE4 is usually 5 days.
3.What payment methods are accepted for NE556DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NE556DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NE556DRE4?
NE556DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NE556DRE4 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 NE556DRE4?
For technical support, including NE556DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NE556DRE4 requirements.
6.How does Aetrix verify that NE556DRE4 is sourced from the original manufacturer or authorized distributors?
All NE556DRE4 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 NE556DRE4 meets industry standards.
7.What is the process for return or replacement of NE556DRE4?
All NE556DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with NE556DRE4, 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 NE556DRE4 part is unused and in its original packaging.
Return procedure for NE556DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NE556DRE4 Tags
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