LDA505 - Inductive Proximity Switch Driver IC, SOP-16 | TCA505 Pin-Compatible
料号： LDA505 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.78 | $7.80 |
| 100 | $0.62 | $62.00 |
| 500 | $0.48 | $240.00 |
| 1,000 | $0.39 | $390.00 |
| 3,000 | $0.31 | $930.00 |
LDA505 概述
An inductive proximity switch driver IC is a specialized interface circuit that conditions the signal from an inductive sensor coil (typically an LC oscillator) and converts it into a clean digital logic output. In the broader system hierarchy it sits between the sensing element (the LC tank or oscillator) and the host controller (a PLC input card, microcontroller GPIO, or industrial counter module). Because the LDA505 integrates the rectifier, threshold detector, hysteresis block, and output driver in one chip, designers replace a discrete solution of dozens of parts with a single IC. Category synonyms include 'proximity sensor IC', 'inductive switch ASIC', and 'proximity amplifier IC'.
The defining features of the LDA505 are its bipolar process technology for robust output drive, integrated short-circuit / overload protection on the output pin, wide supply tolerance compatible with 24 V industrial rails, and SOP-16 footprint that exactly matches the TCA505 land pattern. These features allow direct PCB-level substitution without board rework, provided the host MCU's input logic threshold is verified.
Architecturally the device contains a built-in rectifier for the AC-coupled inductive sensor signal, a comparator with programmable hysteresis, a voltage regulator for internal biasing, and a push-pull or open-collector output stage protected against sustained shorts to VCC or GND. Designers should review the device marking versus the TCA505 to confirm compatibility because some revisions differ in output polarity.
Typical applications include industrial 24 V inductive proximity sensors, position detectors on conveyor lines, metal-object counters, machine-tool end-of-travel limits, and automotive gear-position sensors. The integrated short-circuit protection also makes the part attractive in safety-oriented designs where wire shorts in the field are a real risk.
When designing with the LDA505, treat the supply rail as a 24 V industrial bus with proper reverse-polarity and TVS protection on the connector. Bypass the supply pin with a 100 nF ceramic close to the IC and add a 10 µF bulk capacitor if the cable run exceeds 1 m to suppress load-dump transients.
This page consolidates distributor pricing, drop-in equivalents, and practical design considerations for the LDA505 that are not found in any single vendor datasheet.
直接替换替代料： LDA505 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LDA505 （相同外形与封装尺寸） ——差异在于 Package, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
TCA505BG
✅ 直接替换✓ 有现货
$1.4 / 个
查看数据手册 →TCA505BG
✅ 直接替换✓ 有现货
$1.4 / 个
查看数据手册 →TCA505BG
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.4 / 个
查看数据手册 →LDA505 最大额定值与电气特性
| Part Number | LDA505 |
| 功能 | Inductive proximity switch driver IC with short-circuit protection |
| Pin-compatible With | Infineon TCA505 / TCA505BG (SOP-16) |
| 封装 | SOP-16 |
| 引脚数量 | 16 |
| 工作温度范围 | -65 °C to +150 °C |
| Process Technology | Bipolar |
| Output Protection | Integrated short-circuit protection |
| Hysteresis | Internal, fixed (per TCA505-equivalent architecture) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (per JLCPCB listing) |
LDA505 引脚配置
| 引脚 1 | VCC — Supply voltage (typical 24V industrial rail) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | OSC_IN — Oscillator / sensor input |
| 引脚 4 | OSC_OUT — Oscillator tank drive |
| 引脚 5 | SENSE — Inductive sensor input |
| 引脚 6 | REF — Internal reference |
| 引脚 7 | THRESH — Threshold adjustment |
| 引脚 8 | HYST — Hysteresis setting |
| 引脚 9 | TIMING — External timing component |
| 引脚 10 | FB — Feedback node |
| 引脚 11 | COMP — Compensation network |
| 引脚 12 | OUT — Digital output to host |
| 引脚 13 | OUT_SENSE — Output sense / protection |
| 引脚 14 | PROT — Short-circuit protection node |
| 引脚 15 | NC — Not connected (per TCA505 datasheet) |
| 引脚 16 | GND2 — Secondary ground / thermal pad |
典型应用
LDA505 适用于 6 应用s: Industrial 24V Inductive Proximity Sensor, Conveyor Position Detection, Machine Tool End-of-Travel Limit Switch, Metal Object Counter on Production Line, Automotive Gear Position Sensor, Fluid Level Detection (Non-Contact).
Industrial 24V Inductive Proximity Sensor
The LDA505 fits industrial 24V inductive proximity sensors because it integrates the rectifier, threshold comparator, hysteresis, and short-circuit protected output in a single SOP-16 IC. The part's -65C to +150C operating range easily handles industrial cabinet temperatures near motors and contactors. Designers wire the LDA505 between the LC sensor coil and the 24V digital output transistor, replacing 20+ discrete parts and reducing BOM cost by ~40%.
推荐
Conveyor Position Detection
The LDA505 is well suited for conveyor position detection in material handling lines. The integrated short-circuit protection guards against cable damage on long conveyor runs, and the SOP-16 footprint fits the standard M12/M18 sensor housing PCBs. The TCA505-compatible architecture provides proven 24V industrial bus compatibility with PLC input cards. Detection range is determined by the external LC coil, not the IC.
推荐
Machine Tool End-of-Travel Limit Switch
The LDA505 suits machine tool end-of-travel limit switches where reliability under mechanical vibration and electrical noise is critical. Its bipolar process technology provides robust output drive for direct interface to 24V PLC inputs. The integrated short-circuit protection eliminates the need for external fuses on the sensor output line, simplifying maintenance and reducing wiring harness weight.
推荐
Metal Object Counter on Production Line
The LDA505 fits metal object counters on production lines by providing reliable digital switching from inductive sensors detecting passing metal parts. The SOP-16 package and TCA505 pinout enable drop-in upgrade to modern Infineon parts when supply permits. Built-in hysteresis prevents chatter on slow-moving targets, and the wide temperature range supports hot production environments near ovens or welding stations.
推荐
Automotive Gear Position Sensor
The LDA505 operates from -65C to +150C, comfortably covering automotive under-hood and gearbox temperature profiles for gear position sensing. The integrated short-circuit protection handles the harsh electrical environment of automotive wiring harnesses. Designers should verify AEC-Q100 compliance is not required for the target vehicle program, as the LDA505 lacks formal automotive qualification.
推荐
Fluid Level Detection (Non-Contact)
The LDA505 works in non-contact fluid level detection when paired with a suitable inductive coil that responds to metal float targets. Its SOP-16 footprint allows compact PCB integration inside sealed sensor heads. The integrated short-circuit protection is valuable in wet environments where condensation can create temporary shorts across connector pins. Output logic polarity should be verified against the TCA505 datasheet.
推荐
推荐产品汇总
工程参考数据： LDA505 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TCA505BG | TCA505 | TCA505B |
|---|---|---|---|---|
| Package | SOP-16 | SOP-16 - same | SOP-16 - same | SOP-16 - same |
| Brand | Dandong Hua'ao Electronic | Infineon | Infineon | Infineon |
| Function | Inductive proximity switch driver IC | Inductive proximity switch driver IC | Inductive proximity switch driver IC | Inductive proximity switch driver IC |
| Operating Temperature | -65C to +150C | -40C to +85C | -40C to +85C | -40C to +85C |
| Process Technology | Bipolar | Bipolar | Bipolar | Bipolar |
| Short-Circuit Protection | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) |
| Pinout Compatibility | TCA505 compatible | Original | Original | Variant |
| Automotive Qualification | Not formally qualified | Industrial grade | Industrial / automotive pedigree | Industrial grade |
| Approx. Unit Price (qty 100) | $0.62 (as of 2026-10-10) | $1.20-$1.80 (as of 2026-10-10) | $1.10-$1.60 (as of 2026-10-10) | $1.00-$1.50 (as of 2026-10-10) |
关键差异点
- Lower unit cost than the original TCA505 （对比 TCA505BG)
- Wider operating temperature range （对比 TCA505)
- Integrated short-circuit protection （对比 Discreet sensor front-end)
设计说明
Estimated: At a typical 24V industrial supply with 20mA quiescent draw, the LDA505 dissipates approximately 0.48W. The SOP-16 package has a typical theta_JA of ~80 C/W on a 1oz 2-layer board, producing a junction temperature rise of ~38C above ambient at full load. For sealed sensor heads above 60C ambient, add copper pour on pins 2 and 16 to keep Tj within the -65C to +150C operating window.
Place a 100nF ceramic bypass capacitor within 2mm of the VCC pin (pin 1) and a 10uF bulk capacitor on the supply rail if the cable harness exceeds 1m. The SOP-16 land pattern is JEDEC SO-16 standard; ensure the PCB footprint matches the JEDEC reference, not a narrow SO-8. Pin 1 indicator should be verified before soldering to prevent reversed assembly damage.
Do not assume the LDA505 is automotive-qualified - it lacks formal AEC-Q100 certification. For automotive designs, use the original Infineon TCA505 or TCA505BG instead. Also verify output polarity against your existing TCA505 datasheet because some Chinese-market clones differ in active-high vs active-low output. Finally, treat the AliExpress / Alibaba listings carefully - counterfeit risk on these channels is higher than authorized distributors.
合规信息
RoHS compliance confirmed via JLCPCB part listing. AEC-Q100 qualification not claimed by vendor - choose TCA505BG for automotive programs. REACH, halogen-free, and conflict-mineral status not publicly documented.
