NE555PE4 - 555 Timer 100kHz PDIP-8 Precision | Texas Instruments
N.º da peça: NE555PE4 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.46 | $0,46 |
| 10 | $0.41 | $4,10 |
| 100 | $0.34 | $34,00 |
| 500 | $0.27 | $135,00 |
| 1.000 | $0.22 | $220,00 |
NE555PE4 Visão geral
What is a 555 timer? A 555 timer is a highly integrated analog building block that combines a voltage divider, two comparators, an RS flip-flop, and a discharge transistor into one IC. It belongs to the broader clock-and-timing IC family (clock & timing IC > programmable timer > 555 timer > bipolar timer IC), sitting alongside counters and PLL devices. Within a power-and-signal chain, the 555 timer provides a low-cost means of generating precise time delays, square waves, and pulses, making it a foundational part of hobby, industrial, and educational electronics.
Key features include adjustable duty cycle, TTL-compatible output that can both sink and source up to 200mA, astable/monostable operating modes, and timing accuracy of typically better than 1% with stable external RC components. The internal architecture uses a precision voltage divider (three 5k resistors - hence '555'), two comparators, a flip-flop, and an open-collector discharge transistor, all of which are accessible via the eight external pins.
Typical applications include pulse generation, sequential timing, precision timing, missing-pulse detection, bounce-free switches, linear ramp generators, and PWM modulators. Industrial designers favor the NE555PE4 because of its rugged bipolar design and wide supply tolerance.
A common design consideration is output current capability: the device can sink/source up to 200mA, so a small heat-sinking consideration applies when operating at high duty cycles near the supply rails. Designers should also keep the discharge transistor's collector voltage within ratings and ensure timing capacitors have low leakage to maintain accuracy. Compared to CMOS variants such as the TLC555, the bipolar NE555 draws more quiescent current but offers higher output drive.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers rapidly evaluate fit and source the NE555PE4 for new or legacy designs.
Alternativas drop-in para NE555PE4 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com NE555PE4 (mesmo formato e footprint) — diferindo em Mounting Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
NE555P
✅ Drop-In✓ Em estoque
$0.34 / unidade
Ver ficha técnica →NE555PE4-ND
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SE555P
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SA555P
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TLC555CP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM555CN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
NE555N
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
NE555PE4 Especificações
| Função | 555 Type, Timer/Oscillator (Single) |
| Frequency Range | 1 mHz to 100 kHz |
| Supply Voltage (Vcc) | 4.5 V to 16 V |
| Temperatura de operação | 0 C to 70 C |
| Output Drive (sink/source) | Up to 200 mA |
| Output Compatibility | TTL-compatible |
| Operating Modes | Astable, Monostable |
| Duty Cycle | Adjustable |
| Timing Range | Microseconds to hours |
| Encapsulamento / Caixa | 8-PDIP (through-hole) |
| Número de pinos | 8 |
| Tipo de montagem | Through Hole |
| Status RoHS | Compliant |
| Lead-Free | Yes |
Configuração de pinos do NE555PE4
| Pino 1 | GND — Ground reference (0 V) |
| Pino 2 | TRIG — Trigger input (starts timing when below 1/3 VCC) |
| Pino 3 | OUT — Timer output (TTL-compatible, sinks/sources up to 200 mA) |
| Pino 4 | RESET — Reset input (active low, terminates timing) |
| Pino 5 | CTRL — Control voltage (bypass with 0.01 uF for noise immunity) |
| Pino 6 | THR — Threshold input (ends timing when above 2/3 VCC) |
| Pino 7 | DIS — Discharge transistor (open collector, dumps timing cap) |
| Pino 8 | VCC — Supply voltage (4.5 V to 16 V) |
Aplicações típicas
NE555PE4 é adequado para 6 aplicaçãos: Precision Pulse Generator, Astable Oscillator / Square-Wave Generator, Sequential Timing / Delay Circuit, PWM Motor Speed Controller, Missing-Pulse Detector, Linear Ramp Generator.
Precision Pulse Generator
The NE555PE4 is well suited to precision pulse generation because of its TTL-compatible output capable of sourcing or sinking up to 200 mA and its adjustable duty cycle, per the TI NE555 datasheet. In a monostable (one-shot) configuration, an external resistor and capacitor set the pulse width from microseconds to hours with typical timing accuracy of better than 1%. Place a 0.01 uF bypass capacitor directly across pins 8 (VCC) and 1 (GND), within 5 mm of the IC, to suppress supply noise that would otherwise modulate the internal voltage divider. The high output drive allows direct triggering of power MOSFETs, SCRs, and optocouplers without an intermediate buffer stage. Compared to a discrete multivibrator, the NE555PE4 eliminates transistor matching and resistor tolerance accumulation, improving pulse-to-pulse repeatability. For multi-pulse chains, the NE555PE4's discharge transistor (pin 7) handles capacitor reset in a single stage, removing the cross-conduction losses that plague discrete designs.
Recomendado
Astable Oscillator / Square-Wave Generator
The NE555PE4 generates stable square waves from approximately 1 mHz to 100 kHz by configuring it in astable mode with two external resistors (RA, RB) and one timing capacitor (CT), per the TI NE555 datasheet. The frequency is set by f = 1.44 / ((RA + 2*RB) * CT), with duty cycle adjustable from approximately 50% to 100% via the RA/RB ratio. This makes the part ideal for clock generation, LED flashers, tone-injection circuits, and stepper-motor drive waveforms. Designers should use a timing capacitor with low leakage (film or NP0 ceramic) below 10 uF to maintain accuracy; electrolytic capacitors above 10 uF introduce leakage that shifts frequency. The TTL-compatible output can drive 200 mA, allowing direct drive of small speakers, optocouplers, and low-current solenoids. For frequencies above 100 kHz, the CMOS TLC555CP drops into the same 8-pin PDIP socket and supports up to ~2 MHz operation.
Recomendado
Sequential Timing / Delay Circuit
The NE555PE4 in monostable mode provides precise one-shot delays from microseconds to hours, making it ideal for sequential timing chains, watchdog kick circuits, and power-on reset delays, per the TI NE555 datasheet. A single external RC network sets the delay time, with formula t = 1.1 * R * C, and the part consumes only milliamps of quiescent current. In a sequential-timing chain, multiple NE555PE4 stages can be cascaded - the falling edge of one stage's output triggers the next via pin 2 (TRIG), creating arbitrarily long timing chains. The 200 mA output drive allows the final stage to directly actuate relays, contactors, or solenoid valves. Designers must include a reverse-biased flyback diode across inductive loads to protect the discharge transistor (pin 7) from flyback voltages exceeding the absolute-maximum rating.
Recomendado
PWM Motor Speed Controller
The NE555PE4 is widely used as a low-cost PWM controller for small DC motors, LED dimmers, and heater elements because of its adjustable duty cycle and 200 mA output drive, per the TI NE555 datasheet. In astable mode with a variable resistor in the RA/RB network, duty cycle can be swept from approximately 5% to 95% to control average power delivered to the load. The TTL-compatible output directly drives a logic-level MOSFET gate or a small power transistor, eliminating the need for a separate gate driver in low-current applications. For motor control above 1 A, the NE555PE4's output can drive an optocoupler or gate-driver IC rather than the motor directly. Compared to a microcontroller-based PWM, the NE555PE4 solution has zero firmware overhead, immediate startup, and excellent noise immunity from its bipolar internal architecture.
Recomendado
Missing-Pulse Detector
The NE555PE4 wired as a missing-pulse detector monitors an incoming pulse train and triggers an output if a pulse is missed within a programmed window, per the TI NE555 datasheet. The internal flip-flop holds the output low while pulses arrive within the RC-timed window; if a pulse is missing beyond the timeout, the output transitions high. This is critical for fail-safe monitoring in industrial machinery, conveyor systems, and safety interlocks. The 200 mA output can directly drive alarm relays, LED indicators, or shutdown logic. Designers should choose timing components such that the expected maximum inter-pulse interval is shorter than the RC-timed window by a factor of at least 1.5, ensuring robust detection of pulse-train anomalies. The bipolar architecture provides excellent noise immunity in industrial environments compared to CMOS 555 variants.
Recomendado
Linear Ramp Generator
The NE555PE4 can be configured as a linear ramp generator by injecting a constant current into the timing capacitor via the control-voltage pin (pin 5), per the TI NE555 datasheet. The constant current source charges the timing capacitor linearly, producing a ramp voltage at the threshold pin (pin 6) with sweep time set by the external RC network. Linear ramps are useful for function generators, voltage-controlled oscillators, sawtooth-wave audio synthesis, and analog-to-time conversion circuits. The bipolar internal design provides excellent linearity compared to simple RC charging circuits. For high-linearity audio synthesis, designers can use the NE555PE4's control-voltage pin (pin 5) for voltage-controlled modulation, then route the ramp output through an external buffer op-amp to drive low-impedance loads. The 4.5 V to 16 V supply range allows direct interfacing with both 5 V logic and 12 V analog signal chains.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para NE555PE4 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | NE555P | SE555P | TLC555CP | LM555CN | NE555N |
|---|---|---|---|---|---|---|
| Package | 8-PDIP | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same | 8-PDIP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | STMicroelectronics |
| Technology | Bipolar | Bipolar | Bipolar | CMOS | Bipolar | Bipolar |
| Supply Voltage Range | 4.5 V to 16 V | 4.5 V to 16 V | 4.5 V to 18 V | 2 V to 15 V | 4.5 V to 16 V | 4.5 V to 16 V |
| Max Frequency | 100 kHz | 100 kHz | 100 kHz | ~2 MHz | 100 kHz | 500 kHz |
| Output Drive (sink/source) | 200 mA | 200 mA | 200 mA | ~100 mA | 200 mA | 200 mA |
| Operating Temperature | 0 C to 70 C | 0 C to 70 C | -55 C to +125 C | 0 C to 70 C | 0 C to 70 C | 0 C to 70 C |
| RoHS / Lead-Free | Yes (E4 suffix) | Varies by suffix | Varies by suffix | Yes | Varies by suffix | Yes |
| Approx. Unit Price (qty 1000) | USD 0.22 | USD 0.20 | USD 0.45 | USD 0.28 | USD 0.22 | USD 0.20 |
Principais diferenciais
- Industry-standard 555 architecture with highest output drive in 8-PDIP (vs TLC555CP)
- Lead-free E4 finish (RoHS compliant) (vs NE555P)
- Standard commercial temperature grade (0C to 70C) (vs SE555P)
Notas de projeto
The NE555PE4 requires a supply bypass capacitor placed within 5 mm of pins 8 (VCC) and 1 (GND). Use a 0.1 uF ceramic capacitor in parallel with a 1 uF to 10 uF electrolytic capacitor to suppress both high-frequency and low-frequency supply noise. Without proper bypassing, the internal voltage divider (three 5k resistors) can couple noise into the comparators, causing jitter in astable mode and false triggers in monostable mode.
At maximum output drive of 200 mA, the NE555PE4 dissipates noticeable power in its output stage. For example, at VCC=15V with the output sourcing 100mA into a 5V load, dissipation is approximately (15V-5V) * 0.1A = 1W. Designers should provide copper pours on both top and bottom PCB layers to spread heat, or limit continuous output current to ~50mA in thermally-constrained enclosures.
Do not leave pin 5 (CTRL - control voltage) floating. An unbypassed CTRL pin couples noise into the upper comparator threshold (2/3 VCC), causing frequency instability and duty-cycle drift. Place a 0.01 uF to 0.1 uF bypass capacitor from CTRL to GND. Also, when driving inductive loads (relays, solenoids, motors) from pin 3 or pin 7, always include a flyback diode across the load to clamp the back-EMF to a safe level.
Informações de conformidade
RoHS compliant per TI product page (E4 suffix = lead-free). REACH compliant per TI environmental documentation. Not AEC-Q100 qualified - this is a commercial-grade part. For automotive applications, use SA555P or another qualified timer.
