LTV-817S-TA1-C - 5 kVrms Optocoupler, 50% CTR | Lite-On
N.º da peça: LTV-817S-TA1-C ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.0398 | $0,04 |
| 10 | $0.0398 | $0,40 |
| 100 | $0.035 | $3,50 |
| 500 | $0.0326 | $16,30 |
| 1.000 | $0.0326 | $32,60 |
| 3.000 | $0.03 | $90,00 |
LTV-817S-TA1-C Visão geral
An optocoupler, also called an optoisolator, combines a light-emitting diode with a light-sensitive transistor. The optical path provides galvanic isolation between input and output, preventing ground currents, high-voltage transients, and common-mode disturbances from coupling directly into the protected circuitry. The LTV-817 series belongs to the optocoupler family within optoelectronic semiconductors and is widely used where signal must cross a safety or functional isolation barrier.
Key features include high-density mounting, a 50% minimum CTR bin, and 5,000 Vrms input-output isolation. The verified distributor listings identify one output channel, transistor output, 4-SMD construction, and a compact dual-in-line-compatible surface-mount footprint. The TA1 ordering code identifies the surface-mount taping variant, while the -C suffix identifies the 50% CTR grade. These details allow designers to distinguish the target from base-package, higher-CTR, and other taping variants without changing the electrical function.
The transistor output operates primarily in the open-collector configuration. A pull-up resistor is required at the output to convert collector current into a voltage. Designers must account for CTR binning, load resistance, propagation delay, response time, input drive current, and the operating temperature of the complete circuit. The supplied verified data identifies a 4 microsecond response characteristic at 2 mA and 100 ohms in one distributor listing, but full timing curves and test conditions should be confirmed in the manufacturer datasheet.
Typical applications include isolated control signals in switching power supplies, industrial automation interfaces, motor-control circuits, programmable controllers, and general galvanic-isolation interfaces. The isolation barrier is useful when the output domain has a substantially different ground reference from the input domain or when high switching nodes must be separated from sensitive logic.
The principal design consideration is treating CTR as a design parameter, not a guarantee. The minimum CTR applies at specified test conditions and may vary with temperature, forward current, and collector voltage. Confirm the load resistor and worst-case CTR using the Lite-On datasheet, especially in power-conversion systems with long trace paths or demanding isolation requirements.
This page synthesizes verified distributor data, manufacturer datasheet links, same-package alternatives, and practical selection guidance for engineers evaluating the LTV-817S-TA1-C.
Alternativas drop-in para LTV-817S-TA1-C — 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 LTV-817S-TA1-C (mesmo formato e footprint) — diferindo em Output Type, Current Transfer Ratio (CTR), Package, Input Type, Operating Temperature Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LTV-817S-TA1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTV-817S-C
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTV-817S-TA1-B
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTV-817S-TA1-A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTV-817S-TA1-C Especificações
| Product Type | DC-input phototransistor-output optocoupler |
| Tipo de saída | Phototransistor output |
| Number of Channels | 1 channel |
| Isolation Voltage | 5,000 Vrms |
| Current Transfer Ratio Minimum | 50% at IF = 5 mA, VCE = 5 V |
| Forward Current Test Condition | 5 mA |
| Collector-Emitter Test Voltage | 5 V |
| Encapsulamento | 4-pin surface-mount, 4-SMD |
| Tipo de montagem | SMD/SMT, high-density mounting |
| Package Form | Compact dual-in-line package variant |
| Response Time | 4 us at IF = 2 mA and RL = 100 ohm |
| Isolation Approvals | UL approved E113898; TUV approved R9653630; CSA approved CA91533-1 |
| Status RoHS | Compliant according to distributor comparison data |
| Supplier Price | From $0.0398; LCSC price from $0.0326 as of 2026-10-09 |
| Supplier Inventory | 113,020 pieces listed by LCSC as of 2026-10-09 |
Guia de Configuração de Pinos do LTV-817S-TA1-C compact dual-in-line package variant
Configuração de pinos para LTV-817S-TA1-C (pacote compact dual-in-line package variant). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para LTV-817S-TA1-C.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
LTV-817S-TA1-C é adequado para 6 aplicaçãos: Isolated Switching Power-Supply Control, Industrial Automation Interface, Motor-Control Gate-Interface Signal Isolation, Programmable-Controller Digital Isolation, General Isolated Logic Interface, Isolated Sensor and Measurement Interface.
Isolated Switching Power-Supply Control
The LTV-817S-TA1-C fits feedback and primary-to-secondary control paths in switching converters because its phototransistor output provides isolation while requiring an external pull-up resistor. The verified 5,000 Vrms isolation rating and minimum 50% CTR at IF = 5 mA give the designer defined starting values for the LED current and load network. Place the device so the isolation barrier maintains the required creepage and clearance, and use the datasheet CTR curves at the expected temperature and VCE. Compared with a direct feedback connection, the optocoupler breaks the high-voltage ground loop, but its response and CTR must be included in loop compensation.
Recomendado
Industrial Automation Interface
Use the LTV-817S-TA1-C when a 24 V industrial control signal must drive low-voltage logic on a separate ground domain. Its single phototransistor channel can act as an isolated digital input, with the output collector pulled up to the local logic rail. The verified 4-SMT package supports compact control boards, while the 5,000 Vrms isolation specification helps separate field wiring from sensitive electronics. The minimum 50% CTR must be checked across temperature and load current, and the output transistor should be protected from excessive collector voltage or current when the field wiring has transients.
Recomendado
Motor-Control Gate-Interface Signal Isolation
The LTV-817S-TA1-C can transfer a control command from a low-voltage controller toward a motor-driver or power-stage domain when a phototransistor interface is acceptable. The optocoupler’s isolation barrier helps prevent motor-switching noise from reaching the controller through a direct ground connection. Its minimum 50% CTR and 4-SMD package make the input current and board layout straightforward to plan, but the slower phototransistor response should be accounted for in pulse timing. The verified data does not provide complete propagation-delay curves, so the manufacturer datasheet must be used for edge-sensitive motor-control applications.
Recomendado
Programmable-Controller Digital Isolation
The LTV-817S-TA1-C is suitable for isolating a controller output from an external relay, solenoid, or field logic input. The LED side accepts a DC drive signal, while the phototransistor side provides an open-collector output that becomes a voltage when a pull-up resistor is installed. This arrangement is useful when the controller ground is not the same as the field-side ground or when the external circuit has a substantially higher voltage. The 5,000 Vrms isolation rating is the verified design reference, but the final system must verify working voltage, transient immunity, creepage, and applicable safety standards.
Recomendado
General Isolated Logic Interface
The LTV-817S-TA1-C can bridge a low-voltage logic signal to another circuit domain without sharing a ground reference. The phototransistor collector output is flexible for pull-up placement, allowing the output voltage to match the destination logic rail. The verified 4-SMD package helps reduce board area compared with a through-hole optocoupler, and the 5,000 Vrms isolation specification supports high-voltage separation. Designers should still account for CTR variation, leakage, output rise and fall times, LED forward voltage, and the maximum repetitive peak forward current before finalizing the drive circuit.
Recomendado
Isolated Sensor and Measurement Interface
The LTV-817S-TA1-C can be used as a digital isolation element around a sensor, test fixture, or measurement interface when the output side must remain separated from the input circuitry. Its phototransistor output can drive a comparator, counter, or control input through a pull-up resistor, while the 5,000 Vrms isolation barrier reduces common-mode coupling. The minimum 50% CTR is adequate for many digital threshold applications, but it should be evaluated at the lowest expected CTR and highest temperature. The verified response-time value of 4 microseconds at IF = 2 mA and RL = 100 ohm provides a useful indication that the device is not intended for the fastest optocoupler applications.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LTV-817S-TA1-C — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LTV-817S-TA1 | LTV-817S-C | LTV-817S-TA1-B | LTV-817S-TA1-A | LTV-817 |
|---|---|---|---|---|---|---|
| Package | 4-pin SMD / 4-SMD | 4-pin SMD | 4-pin SMD | 4-pin SMD | 4-pin SMD | PDIP-4 through-hole |
| Brand | Lite-On | Lite-On | Lite-On | Lite-On | Lite-On | Lite-On |
Principais diferenciais
- Compact surface-mount construction (vs LTV-817)
- Defined 50% minimum CTR grade (vs LTV-817S-TA1-B)
- Single-channel isolation in a 4-pin package (vs LTV-817S-C)
- Isolation-oriented product family (vs Direct signal connection)
Notas de projeto
Treat the isolation barrier as a layout constraint, not merely a component footprint. Keep the input-side and output-side copper regions physically separated according to the working voltage, creepage, clearance, and safety requirements of the complete equipment. Place the optocoupler so its isolation body sits between the two domains, and avoid routing unprotected high-voltage copper beneath or across the isolation barrier. Verify the final land pattern against the Lite-On package drawing because the verified search results identify a 4-SMD package but do not provide a complete machine-readable pinout.
Do not assume that a 50% minimum CTR at IF = 5 mA and VCE = 5 V guarantees the same ratio at every temperature, forward current, or collector voltage. Select the input resistor so the LED operates within its permitted current and duty-cycle limits, then calculate the output pull-up resistor using the worst-case CTR, required sink current, and output logic threshold. Check the manufacturer CTR curves and absolute maximum ratings before production release.
Estimate the optocoupler dissipation from both the LED input current and the phototransistor output current before applying thermal limits. The LED side is driven by the external source, while the collector side can dissipate power in the pull-up load when the transistor is on or when the output transistor operates in the linear region during transitions. Because the verified data does not provide complete maximum ratings, use the Lite-On datasheet for absolute maximum current, power dissipation, and thermal derating rather than extrapolating from distributor summaries.
Keep the optocoupler output loop small and connect the output pull-up resistor close to the phototransistor collector when timing or noise performance matters. Provide a low-impedance return path on the emitter side and decouple the destination logic rail according to that circuit’s requirements. In switching-power applications, route the optocoupler away from high-dV/dt transformer and switch-node copper, and assess parasitic capacitance across the isolation barrier because it can degrade isolation performance and increase EMI coupling.
Informações de conformidade
The verified datasheet listing states UL approval E113898, TUV approval R9653630, and CSA approval CA91533-1. RoHS compliance is reported in verified distributor comparison data. REACH, lead-free, halogen-free, and conflict-minerals status were not independently verified.
