TS556ID - Dual 2.7MHz CMOS Timer | STMicroelectronics
MPN: TS556ID ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
TS556ID Overview
A 555-type timer is a programmable clock and timing semiconductor that can operate as a monostable one-shot or astable oscillator. In system hierarchy, the TS556ID belongs to clock and timing ICs, timer ICs, oscillators, and semiconductors. Each internal timer provides resistive and capacitive timing inputs, trigger and reset controls, and an output stage. Two independent sections allow one circuit to generate two events, delays, tones, or periodic waveforms.
The verified data identifies the TS556 as a pin-to-pin and functionally compatible bipolar NE556 design, while reducing typical supply current to 220 µA at a 5 V supply. Another source lists 180 µA typical at 3 V. Its 2.7 MHz maximum astable frequency allows shorter timing periods and higher-frequency waveform generation than a 0.1 MHz NE556, subject to the datasheet's timing limits, component tolerances, and output-drive conditions.
The TS556ID supports monostable and astable operating modes. In monostable service, an external trigger produces a timed output pulse whose duration is determined primarily by external resistance and capacitance. In astable service, external timing components charge and discharge an internal node, producing continuous oscillation. Engineers should calculate the timing values from the manufacturer datasheet, include realistic resistor and capacitor tolerances, and verify output rise and fall behavior in the intended load.
Typical uses include low-power pulse generation, delayed actuator triggering, LED and indicator flashing, audible tones, small signal-clock generation, industrial control timing, and embedded system timing support. The dual architecture is especially useful when two related but nonsynchronous events are needed. Compared with a NE556, the principal benefits are lower typical consumption and a substantially higher maximum astable frequency; NE556 compatibility does not mean every electrical limit is identical.
Design with the 2 V to 16 V supply range in mind, especially the output behavior at low supply voltage. Keep the reset and trigger paths free of unwanted noise, select timing-component tolerances for the required frequency accuracy, and provide the bypass and output-loading conditions required by the datasheet. Because timing accuracy depends on real component values and parasitics, breadboard validation is advisable for high-frequency or precision intervals.
This page combines verified manufacturer and distributor information, practical timing guidance, and a conservative assessment of drop-in replacements. It distinguishes documented electrical facts from parameters that require datasheet confirmation, helping engineers locate the TS556ID datasheet, evaluate purchasing options, and decide whether a same-package substitute is suitable for an existing PCB.
Drop-in alternatives for TS556ID — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TS556ID (same form factor and footprint) — differing in Mounting Type, Package, Timer Configuration.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLC556IDR
✅ Drop-In📋 Reference alternative (not in catalog)
TLC556CD
✅ Drop-In📋 Reference alternative (not in catalog)
NE556DR
✅ Drop-In📋 Reference alternative (not in catalog)
NE556N
✅ Drop-In📋 Reference alternative (not in catalog)
TS556ID Specifications
| Timer Configuration | Dual independent 555-type timer sections |
| Operating Modes | Monostable and astable |
| Supply Voltage Range | 2 V to 16 V |
| Typical Supply Current at 5 V | 220 µA |
| Typical Supply Current at 3 V | 180 µA |
| Maximum Astable Frequency | 2.7 MHz |
| Reference Bipolar Timer | NE556 |
| Compatibility | Pin-to-pin and functionally compatible with bipolar NE556 |
| Integrated Circuit Type | Dual CMOS timer and oscillator |
| Output Type | Timer output; detailed electrical limits not provided |
| Package | 14-pin SOIC |
| Mounting Type | Surface mount |
| Reset Control | Reset input supported on each timer section |
TS556ID Pin Configuration
| Pin 1 | 1OUT — Timer 1 output |
| Pin 2 | 1DISCH — Timer 1 discharge node |
| Pin 3 | 1THR — Timer 1 threshold input |
| Pin 4 | 1RESET — Timer 1 reset input |
| Pin 5 | 1CV — Timer 1 control voltage input |
| Pin 6 | 1TRIG — Timer 1 trigger input |
| Pin 7 | GND — Ground |
| Pin 8 | 2TRIG — Timer 2 trigger input |
| Pin 9 | 2CV — Timer 2 control voltage input |
| Pin 10 | 2RESET — Timer 2 reset input |
| Pin 11 | 2THR — Timer 2 threshold input |
| Pin 12 | 2DISCH — Timer 2 discharge node |
| Pin 13 | 2OUT — Timer 2 output |
| Pin 14 | VCC — Positive supply input |
Typical Applications
TS556ID is suitable for 6 applications: Low-Power Dual Pulse Generator, Astable Clock and Tone Source, Industrial Delay and Relay Trigger, LED Flashing and Indicator Timing, Sensor-Activated One-Shot, Test and Measurement Timing Reference.
Low-Power Dual Pulse Generator
The TS556ID fits independent pulse and delay generation because it contains two 555-type timer sections in one 14-pin SOIC device. One section can create a delayed trigger pulse while the other handles a periodic or one-shot event, reducing board area compared with two separate timers. Its verified 220 µA typical current at 5 V supports low-power designs, although the external resistors, capacitors, and load must be included in the final current budget. Use the datasheet timing equations and verify pulse width on the intended supply.
Recommended
Astable Clock and Tone Source
The TS556ID is suitable for astable clock or tone generation because the verified maximum astable frequency is 2.7 MHz. A resistive-capitive network establishes the timing interval, while the timer output supplies a periodic waveform for a clock, indicator, or audio stage. Compared with a conventional NE556 timing section, the supplied data identifies higher frequency capability and lower typical consumption. Actual waveform quality depends on resistor and capacitor tolerance, load capacitance, supply voltage, and layout.
Recommended
Industrial Delay and Relay Trigger
The dual TS556ID can implement an event delay followed by a separate trigger or retrigger function for industrial control boards. The first timer section may create a fixed-duration pulse after an input transition, and the second can provide a repeated supervisory or acknowledgment pulse. Its 2 V to 16 V supply range is useful across multiple logic rails, while the CMOS supply current helps limit idle consumption. Confirm output current, reset polarity, and timing tolerance before driving relays or other inductive loads.
Recommended
LED Flashing and Indicator Timing
For LED flashing, beacon, and status-indicator circuits, the TS556ID provides a compact dual-timer solution. One section can flash one indicator while the other controls a second indicator or creates a delayed status change. The verified low typical supply current at 5 V and 3 V is beneficial in battery-operated indicator products, while the 2.7 MHz maximum gives ample headroom for ordinary low-frequency timing. Select timing resistors and capacitors for the required visible flash interval and account for LED current-limiting resistors.
Recommended
Sensor-Activated One-Shot
A TS556ID timer section can create a fixed-duration one-shot pulse when a sensor or comparator transition arrives, which is useful for alarm, sample, or actuator-trigger systems. The second section can debounce or generate a related acknowledgement interval. The CMOS device's low typical supply current helps in remote or portable systems, and its monostable/astable flexibility permits both event capture and repetitive timing. The input must remain within the datasheet trigger and reset thresholds, and the output should be buffered for larger loads.
Recommended
Test and Measurement Timing Reference
The TS556ID can provide repetitive timing or delayed triggers in compact test and measurement equipment. Its two sections allow a clock interval and a delayed sample-and-hold trigger to be generated independently, while the 2.7 MHz maximum frequency supports faster timing experiments than the cited 0.1 MHz bipolar NE556 limit. Use low-tolerance timing components when frequency accuracy matters, keep trigger and reset traces short, and measure the output under the intended load. The TS556ID does not replace a precision reference clock when calibration-grade accuracy is required.
Recommended
Recommended Products Summary
Engineering reference data for TS556ID — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLC556IDR | TLC556CD | NE556DR |
|---|---|---|---|---|
| Brand | STMicroelectronics | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-pin SOIC | SOIC-14 | SOIC-14 | SOIC-14 |
| Timer Architecture | Dual CMOS 555-type timer | Dual timer; verify manufacturer data | Dual timer; verify manufacturer data | Dual bipolar NE556 |
Key Differentiators
- Higher documented maximum astable frequency (vs NE556DR)
- Lower typical supply consumption (vs NE556DR)
- Dual CMOS timing in one package (vs NE556DR)
Design Notes
Use the STMicroelectronics TS556 astable or monostable equations to calculate nominal timing values, then include resistor and capacitor tolerances rather than relying on ideal components. Near the verified 2.7 MHz maximum, propagation delay, loading, and PCB parasitics can materially affect frequency. Start with the datasheet reference topology, keep the timing network close to the relevant pins, and measure the output waveform with the intended supply and load.
Place the timing resistor and capacitor network close to the relevant TS556 pins and route the timing node away from fast output and clock traces. Keep the control-voltage bypass path short and preserve a clean ground reference, especially when two timer sections operate at different intervals. The verified 2.7 MHz capability makes edge-rate and parasitic-capacitance effects more relevant than in a low-frequency NE556 design.
The verified 220 µA typical supply current at 5 V is a useful starting point, but it excludes the final system load and external timing-network losses. In battery designs, calculate average current over the monostable or astable duty cycle and verify reset and leakage behavior at the minimum supply voltage. Use a stable supply and local decoupling according to the manufacturer datasheet; do not treat typical current as a worst-case regulator budget.
Compliance Information
The supplied verified data does not explicitly state TS556ID regulatory or automotive qualification status. Confirm the exact ordering code with STMicroelectronics compliance documentation.
