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Texas Instruments SA555DRE4
- Part No.:
- SA555DRE4
- Manufacturer:
- Texas Instruments
- Category:
- Programmable Timers and Oscillators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA555DRE4.pdf
- Description:
- IC OSC SGL TIMER 100KHZ 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,929
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Product details
Overview
SA555DRE4 from Texas Instruments is a precision bipolar 555 timer IC operating in monostable or astable mode, featuring ±200mA output drive capability, 4.5V–16V supply range, and –40°C to +85°C industrial temperature rating. It delivers accurate timing from microseconds to hours using external RC networks and is widely used in pulse-shaping, missing-pulse detection, and PWM circuits.
For engineers reviewing the SA555DRE4 datasheet, SA555DRE4 pinout, SA555DRE4 application, or SA555DRE4 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for industrial timing designs.
Technical Context
The SA555DRE4 implements a dual-comparator architecture with an SR latch and high-current output stage, enabling precise threshold (≈2/3 VCC) and trigger (≈1/3 VCC) detection. Its internal resistor divider sets reference voltages, while the CONT pin allows external adjustment of these thresholds.
Timing intervals are determined by external RC components: monostable operation uses one resistor and capacitor; astable operation uses two resistors and one capacitor to independently control frequency and duty cycle. Output switching is rail-to-rail compatible with TTL logic at 5V and supports up to 200mA sink/source current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 16V - Enables direct interface with 5V and 12V industrial power rails without level shifting. |
| Output Drive Capability | ±200mA - Directly drives relays, LEDs, or MOSFET gates without external buffer stages. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial environments including motor controls and factory automation. |
| Timing Accuracy (Temp) | 50 ppm/°C - Ensures stable pulse duration across temperature swings in unregulated enclosures. |
| Supply Sensitivity | 0.1–0.5 %/V - Minimal timing drift over input voltage variations typical in battery-backed or unregulated supplies. |
| Propagation Delay | 100–300 ns - Supports reliable operation up to ~100kHz astable frequency with predictable edge timing. |
| Threshold Voltage | ≈2/3 × VCC - Fixed internal reference enables consistent timing independent of supply tolerance. |
Pinout & Package
SA555DRE4 is housed in an 8-pin SOIC (D) package with gull-wing leads, 1.27 mm pitch, and standard JEDEC MS-012AC footprint. The package supports reflow soldering and offers thermal resistance RθJA = 125.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Return path for all internal circuitry and discharge current; must be low-impedance for stable timing. |
| TRIG (Pin 2) | Start-of-timing input | Active-low trigger: falling edge below ≈1/3 VCC initiates monostable interval or resets astable cycle. |
| OUT (Pin 3) | High-current output | Push-pull stage capable of sourcing/sinking up to 200mA; TTL-compatible at 5V supply. |
| RESET (Pin 4) | Asynchronous reset | Active-low override: forces OUT low and DISCH on regardless of TRIG/THRES state; tie to VCC if unused. |
| CONT (Pin 5) | Threshold control | Adjusts internal comparator references; bypass with 10nF capacitor to reduce noise sensitivity. |
| THRES (Pin 6) | End-of-timing input | Falling edge below ≈2/3 VCC terminates monostable interval or triggers DISCH in astable mode. |
| DISCH (Pin 7) | Timing capacitor discharge | Open-collector output tied to GND when OUT is low; discharges external timing capacitor during reset phase. |
| VCC (Pin 8) | Power supply input | Accepts 4.5V–16V; internal regulation ensures stable reference generation across full supply range. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable duty cycle | Astable mode supports independent tuning of high/low time via RA and RB - enables custom waveform generation without additional logic. |
| TTL-compatible output | At 5V supply, VOH ≥ 2.75V and VOL ≤ 0.35V meet standard TTL input thresholds - eliminates level-shifting in mixed-logic systems. |
| Microsecond-to-hour timing | RC network scaling allows single-chip solutions from 10µs pulses to multi-hour delays - reduces BOM count vs microcontroller-based timers. |
| Reset override capability | Hardware-level RESET pin provides deterministic restart under fault conditions - critical for safety-critical industrial sequencers. |
| Low supply sensitivity | Timing interval varies only 0.1–0.5% per volt - maintains accuracy across aging batteries or unregulated wall adapters. |
Applications
| Missing-Pulse Detection | Pulse-Width Modulation |
|---|---|
|
Use Scenario: Monitoring serial data streams or encoder outputs where loss of signal indicates mechanical failure or communication error. IC Role / Device Role / Timing Role: Monostable timer retriggered by each valid pulse; output goes high only when inter-pulse gap exceeds programmed timeout. Use Value: Detects open-circuit sensors or broken belts without firmware intervention - enables fail-safe shutdown in PLC I/O modules. |
Use Scenario: Generating variable-duty-cycle gate signals for analog dimming of high-brightness LEDs in industrial lighting. IC Role / Device Role / Timing Role: Monostable configured with CONT pin modulated by analog control voltage to vary output pulse width. Use Value: Achieves smooth brightness control with <1% linearity error across 10:1 dimming range using passive RC components only. |
| Pulse-Position Modulation | Sequential Timing Control |
|
Use Scenario: Encoding sensor data (e.g., temperature or pressure) onto timing position of fixed-frequency pulses for noise-immune transmission. IC Role / Device Role / Timing Role: Astable oscillator with CONT pin driven by sensor-derived voltage to shift THRES/TRIG thresholds and modulate output edge timing. Use Value: Converts analog sensor output into robust time-encoded signal immune to EMI in motor drive cabinets. |
Use Scenario: Power-up sequencing of FPGA, ADC, and RF transceiver in test equipment requiring strict enable-order timing. IC Role / Device Role / Timing Role: Cascaded monostable timers where output of first triggers second, creating precise delay chain. Use Value: Guarantees 10ms–500ms staggered power-on without microcontroller boot delay or external timing ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE555P | 0°C to +70°C operating range; same SOIC-8 pinout and electrical specs except reduced temp grade. | Restricted to commercial-grade applications (e.g., consumer electronics, lab instruments) without extended thermal requirements. | Select NE555P only when ambient temperature remains within 0–70°C and industrial qualification is unnecessary. |
| TLC555CP | CMOS process: 2V–15V supply, 100µA quiescent current, lower output drive (100mA), improved supply rejection. | Better suited for battery-powered devices and low-noise analog systems; not drop-in due to different output stage behavior. | Choose TLC555CP when ultra-low power or higher noise immunity is required, accepting trade-offs in drive strength and legacy compatibility. |
Compared with SA555DRE4, NE555P lacks industrial temperature support but matches pinout and drive strength, while TLC555CP trades output current for power efficiency and supply flexibility - making SA555DRE4 optimal for ruggedized 5–15V industrial timing where reliability across –40°C to +85°C is mandatory.
Availability
SA555DRE4 is available at Aetrix Electronics and suitable for industrial controls, pulse-shaping circuits, and missing-pulse detectors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA555DRE4 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 connectivity technologies, with decades of experience in precision timing and industrial-grade ICs.
The SA555DRE4 belongs to TI's legacy precision timer product line, designed specifically for robust, low-cost, high-reliability timing functions in industrial automation, test equipment, and power management systems.
FAQ
What is the maximum operating supply voltage for SA555DRE4?
The SA555DRE4 supports a recommended operating supply voltage range of 4.5V to 16V. Its absolute maximum rating is 18V, but sustained operation above 16V risks parametric degradation and reduced reliability. At 16V, output drive remains within ±200mA specification and timing accuracy holds per datasheet limits.
Can SA555DRE4 directly drive a 12V relay coil?
Yes, SA555DRE4 can directly drive a 12V relay coil if its coil resistance is ≥60Ω (drawing ≤200mA). The IC's output stage sinks or sources up to 200mA, and its low-level output voltage stays ≤0.4V at 100mA load - ensuring sufficient voltage margin for most 12V relay dropout thresholds. Always verify coil inrush current does not exceed peak rating.
How does the CONT pin affect timing accuracy in SA555DRE4?
The CONT pin in SA555DRE4 adjusts the internal threshold and trigger reference voltages. When left open or bypassed with a capacitor, it defaults to ≈2/3 VCC. Applying an external voltage shifts both thresholds proportionally - enabling voltage-controlled timing but introducing sensitivity to noise and source impedance. For best accuracy, use low-impedance sources and 10nF bypassing.
Is SA555DRE4 pin-compatible with NE555 or LM555?
Yes, SA555DRE4 is pin-compatible with NE555 and LM555 in SOIC-8 (D) and PDIP-8 (P) packages. All share identical pin numbering, function mapping, and basic electrical behavior. However, SA555DRE4 extends operating temperature to –40°C to +85°C and specifies tighter timing stability (50 ppm/°C) versus NE555's 70°C limit and looser drift spec.
What is the minimum monostable pulse width achievable with SA555DRE4?
The minimum monostable pulse width for SA555DRE4 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 saturated. To achieve shorter pulses, consider high-speed alternatives like the TLC551 or discrete logic-based one-shots.
SA555DRE4 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
SA555DRE4 FAQ
1.How can I place an order for SA555DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA555DRE4 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 SA555DRE4 reliable?
The price and inventory of SA555DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA555DRE4 is usually 5 days.
3.What payment methods are accepted for SA555DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA555DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA555DRE4?
SA555DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA555DRE4 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 SA555DRE4?
For technical support, including SA555DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA555DRE4 requirements.
6.How does Aetrix verify that SA555DRE4 is sourced from the original manufacturer or authorized distributors?
All SA555DRE4 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 SA555DRE4 meets industry standards.
7.What is the process for return or replacement of SA555DRE4?
All SA555DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SA555DRE4, 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 SA555DRE4 part is unused and in its original packaging.
Return procedure for SA555DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA555DRE4 Tags
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