PS2501-1 - 5000Vrms 1-Ch NPN Phototransistor Optocoupler | Renesas
N.º de pieza: PS2501-1 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.78 | $0,78 |
| 10 | $0.66 | $6,60 |
| 100 | $0.52 | $52,00 |
| 500 | $0.41 | $205,00 |
| 1.000 | $0.33 | $330,00 |
PS2501-1 Descripción general
An optocoupler, also called an optoisolator or photocoupler, is a semiconductor device that transmits electrical signals between two isolated circuits using an internal optical pathway. The hierarchy is: optocoupler -> isolator -> signal isolation component -> optoelectronic device. PS2501-1 sits inside the larger category of transistor-output optocouplers (as opposed to triac-output, MOSFET-output, or logic-output types), and is used where designers need galvanic isolation up to a few kV combined with simple analog or digital signal transfer.
Key features include a wide operating temperature range of -55C to +100C, a collector-emitter voltage (VCEO) of 40 V, collector current up to 40 mA, response time tr/tf in the microsecond range, and a GaAs LED emitter that operates from IF = 5 to 50 mA. The 4-DIP through-hole pinout is pin-compatible with industry-standard 4-pin optocouplers (1: LED+, 2: LED-, 3: emitter, 4: collector), enabling drop-in substitution in existing designs. The plastic DIP body is supplied in standard 6-pin DIP lead-pitch (0.3"/7.62 mm spacing) for easy PCB integration.
Typical applications include AC-line detection circuits, programmable logic controller (PLC) input/output modules, switching power supply feedback loops, microcomputer input interfaces, and analog signal isolation in test and measurement equipment. The 5000 Vrms isolation rating makes it suitable for medical and industrial equipment where regulatory isolation barriers are required (UL 1577, IEC 60747-5-5 class conditions apply to the family when so marked).
When designing with the PS2501-1, add a base-to-emitter resistor (typically 100 kOhm to 1 MOhm) when the application is sensitive to dv/dt induced turn-on, and bypass the LED supply with at least 0.1 uF in parallel with 10 uF to keep the input side stable. The CTR degrades over time at high IF and high temperature - derate CTR to roughly 50% of the nominal value for designs with a 10-year operating-life target.
This page consolidates distributor pricing for the PS2501-1, lists available drop-in alternatives from Renesas and cross-brand manufacturers, and includes practical design notes that go beyond the manufacturer datasheet to help engineers select the right optocoupler for their isolation stage.
Alternativas directas para PS2501-1 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PS2501-1 (mismo factor de forma y huella) — difiere en Mounting Type, Output Type, Package, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PS2501-4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PS2561-1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PS2501L-1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PC817
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EL817
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTV-817S-TA1-C
✅ Sustitución directa✓ En stock
$0.03 / unidad
Ver hoja de datos →TLP521-1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SFH615A-1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PS2501-1 Valores máximos y características eléctricas
| Channel Count | 1 |
| Tipo de salida | Transistor (NPN Phototransistor) |
| Input Type | DC (GaAs LED) |
| Isolation Voltage (rms) | 5000 Vrms |
| Tensión colector-emisor (Vceo) | 40 V |
| Corriente de colector (Ic) | 40 mA maximum |
| Forward Current (IF) | 50 mA maximum |
| Forward Voltage (VF) | 1.4 V typical at IF=50 mA |
| Reverse Voltage (VR) | 6 V |
| Current Transfer Ratio (CTR) | 80% typical at IF=5 mA, VCE=5 V |
| Rango de temperatura de funcionamiento | -55C to +100C |
| Encapsulado | 4-DIP (6-pin DIP lead pitch 0.3 inch / 7.62 mm) |
| Tipo de montaje | Through Hole |
| Nivel MSL | 1 (per JEDEC J-STD-020) |
| Estado RoHS | Compliant (lead-free finish option -A) |
| UL 1577 Recognition | Recognized (factory-installed option) |
Configuración de pines de PS2501-1
| Pin 1 | Anode — LED anode (input +). Drive with positive current through external series resistor. |
| Pin 2 | Cathode — LED cathode (input -). Connect to ground on input side. |
| Pin 3 | Emitter — Phototransistor emitter (output -). Often tied to GND on output side. |
| Pin 4 | Collector — Phototransistor collector (output +). Pull-up resistor to VCC on output side. |
Aplicaciones típicas
PS2501-1 es adecuado para 6 aplicacións: AC Line Voltage Detection, PLC Input Module Interface, Switching Power Supply Feedback, Microcomputer Input Interface, Telecom Line Interface Isolation, Medical Equipment Signal Isolation.
AC Line Voltage Detection
The PS2501-1's 5000 Vrms isolation and 4-DIP footprint suit AC-line detection circuits in consumer appliance controls, where the phototransistor side is referenced to a safe low-voltage control rail while the LED input is driven from the AC mains through a series resistor and bridge rectifier. With a typical CTR of 80% at IF=5 mA and VCEO of 40 V, the PS2501-1 reliably replicates the zero-cross of the AC waveform across the isolation barrier without exposing the microcontroller to dangerous mains transients. Unlike a digital isolator, the optical coupling tolerates slow dv/dt signals and resists common-mode transients up to several kV/us, which is essential for handling the inductive kickback from solenoids and motors on the same AC bus.
Recomendado
PLC Input Module Interface
In PLC digital input modules, the PS2501-1 isolates 24 V industrial field signals from the PLC's 5 V or 3.3 V backplane. The 5000 Vrms rating covers typical IEC 61131-2 industrial installation environments, and the 4-DIP package footprint simplifies the multi-channel PCB layout (one optocoupler per input). Operating the LED at IF=10 mA yields a CTR of about 70% even with age and temperature derating, ensuring reliable logic-level switching into the PLC backplane. Compared to transformer-based isolation, the PS2501-1 costs less than $0.40 per channel and saves the PCB area transformers require, enabling compact 16- or 32-channel input modules.
Recomendado
Switching Power Supply Feedback
In isolated AC-DC switch-mode power supplies, the PS2501-1 forms the primary-to-secondary feedback path when secondary-side regulation must remain isolated from the controller on the primary side. The PS2501-1's 40 V VCEO handles the TL431 error-amp node without breakdown, and the 80% CTR at IF=5 mA provides the gain bandwidth typically required for sub-100 kHz primary-side feedback control loops. While digital isolators or isolation transformers are alternative topologies, the PS2501-1 offers the lowest BOM cost - under $0.50 - and the simplest compensation network for low-to-medium-frequency flyback, forward, and quasi-resonant converters used in white goods, USB-PD adapters, and LED drivers.
Recomendado
Microcomputer Input Interface
Microcontrollers in industrial and medical equipment use the PS2501-1 to safely receive digital inputs that originate from higher-voltage or noisy environments. The 5000 Vrms isolation barrier protects the MCU from fault voltages up to 5000 Vrms - well above the working voltage of typical 5 V or 3.3 V GPIO pins - while the phototransistor output pulls the logic rail cleanly with microsecond response times. CTR bin selection at 80% typical is well-matched to standard CMOS input thresholds, eliminating external amplifiers in most digital input designs. Recommended for MCU input modules on medical infusion pumps, patient monitors, and HVAC thermostats.
Recomendado
Telecom Line Interface Isolation
In telecom line-interface units, the PS2501-1 provides isolation between the analog tip-ring line-driver circuitry and the digital processing card, protecting codecs and DSPs from lightning-induced surges and AC power cross events. The GaAs LED emitter and 1.4 V typical forward voltage pair with a simple constant-current driver to maintain stable IF across temperature. The 5000 Vrms is below the 1500 V working-voltage referenced in many telecom ground-isolation rules but adequate for short-haul interface cards on customer-premises equipment. Recommended for line cards, ringing generator circuits, and CODEC-side signal isolation in DSL/POTS hardware.
Recomendado
Medical Equipment Signal Isolation
The PS2501-1's 5000 Vrms isolation meets the basic insulation requirements of medical patient-monitoring equipment under IEC 60601-1 when the device is integrated inside a suitably designed isolation barrier. With 1 channel per IC in a 4-DIP package, designers can place one PS2501-1 per patient-connected signal chain (ECG lead, SpO2 driver, temperature probe), keeping creepage and clearance paths manageable. The bipolar phototransistor output interfaces directly with low-power analog front ends; the typical CTR of 80% ensures the receiver-side amplifier has the expected input swing. Approved alternatives include higher-isolation families such as PS2561L-1-ERQ1 with automotive-grade qualification when supply chain risk management demands a secondary source.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PS2501-1 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PS2561-1 | PS2501L-1 | PC817 | EL817 | LTV-817 | TLP521-1 | SFH615A-1 |
|---|---|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Sharp | Everlight Electronics | Lite-On | Toshiba | Vishay Intertechnology |
| Package | 4-DIP | 4-DIP - same | 4-DIP (Gull-wing SMD) - same pin function | 4-DIP - same | 4-DIP - same | 4-DIP - same | 4-DIP - same | 4-DIP - same |
| Isolation Voltage (rms) | 5000 Vrms | 5300 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5300 Vrms | 5300 Vrms |
| CTR (typical) | 80% @ IF=5 mA | 80% @ IF=5 mA | 80% @ IF=5 mA | 50%-600% (bin-dependent) | 50%-600% (bin-dependent) | 50%-600% (bin-dependent) | 50%-600% (bin-dependent) | 50%-300% (bin-dependent) |
| VCEO max | 40 V | 80 V | 40 V | 35 V | 35 V | 35 V | 55 V | 70 V |
| Forward Voltage (VF) | 1.4 V typical @ 50 mA | 1.4 V typical | 1.4 V typical | 1.2 V typical | 1.2 V typical | 1.2 V typical | 1.3 V typical | 1.35 V typical |
| Operating Temperature | -55C to +100C | -55C to +100C | -55C to +100C | -30C to +100C | -55C to +110C | -55C to +110C | -55C to +100C | -55C to +100C |
| Unit Price (1000-pc) | $0.33 | $0.45 | $0.35 | $0.10 | $0.12 | $0.12 | $0.18 | $0.28 |
Diferenciadores clave
- Renesas qualification pipeline with consistent CTR bin (frente a PC817)
- Lower BOM cost than high-isolation Renesas PS2561 (frente a PS2561-1)
- Same-package SMD variant available in Renesas portfolio (frente a PS2501L-1)
Notas de diseño
Estimated: The PS2501-1 LED's forward voltage drops as much as 0.3 V across the operating-temperature range (-55C to +100C). When choosing the LED series resistor, assume the worst-case forward current at minimum IF: VCC_min = (VCC_rail - V_F_min - V_LED_drive_drop) / R_series. For 5 mA nominal at IF=5 mA and VCC=5 V, a 720-ohm resistor (1%) gives 5.07 mA nominal, but at cold temperatures VF drops to ~1.1 V, which raises IF to ~5.4 mA - safe for 50 mA maximum. For 3.3 V rails, derate IF to 3 mA nominal since VF approaches VCC at low temperatures and would otherwise cut off the LED.
On the PCB, route the LED ground return directly to the input-side ground plane, and isolate it from the output-side ground with at least a 7 mm creepage gap (4-DIP standard lead pitch). Avoid placing signal traces beneath the optocoupler body where any conductive solder paste could compromise the isolation barrier. The 4-DIP through-hole package has a clearance of approximately 5 mm pin-to-pin, which is adequate for 250 V working voltage but not for 5000 Vrms - additional PCB slotting or even a cutout around the device is recommended for full 5000 Vrms performance.
When using the PS2501-1 in a digital feedback loop (e.g., isolated SMPS control), the phototransistor's response time of typically 3 us to 5 us limits the closed-loop bandwidth to roughly 100 kHz. For loop bandwidths above 200 kHz, consider a 6-DIP logic-output optocoupler (e.g., PS9821-2) or a digital isolator. Adding a 10k pull-up resistor to VCC accelerates the rise time but increases power dissipation in the output NPN's saturation - tune the pull-up to the chosen switching frequency.
The PS2501-1 LED draws 5 mA to 50 mA from the input side, meaning total input power per channel is around 7 mW to 70 mW. The output phototransistor dissipates approximately IC * VCE(sat); when fully on with a 10k pull-up to 5 V, the transistor saturates and dissipation stays below 5 mW. Total channel dissipation is dominated by the LED; for battery-powered isolation stages (e.g., isolated digital I/O in portable devices), consider reducing IF to 2 mA or substituting a more efficient digital isolator IC.
Información de cumplimiento
PS2501-1 with -A suffix is lead-free and RoHS compliant per Renesas product page. UL 1577 recognition is available on factory-installed option (PS2501-1-UL). For automotive grade (AEC-Q100), select the PS2561L-1-ERQ1 variant. Standard PS2501-1 is not AEC-Q100 qualified.
