TMP20AIDCKR - +/-2.5C Analog Temp Sensor, -55 to 130C | TI
부품 번호: TMP20AIDCKR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.78 | $0.78 |
| 10 | $0.72 | $7.20 |
| 100 | $0.55 | $55.00 |
| 500 | $0.42 | $210.00 |
| 1,000 | $0.32 | $320.00 |
TMP20AIDCKR 개요
An analog temperature sensor is a semiconductor device whose output voltage (or current) varies linearly with the die temperature, allowing a microcontroller ADC to read temperature directly without requiring a specialized digital interface. The TMP20 family belongs to the broader hierarchy of temperature sensor -> thermal management sensor -> sensor IC -> semiconductor. Compared with digital-output sensors (I2C/SPI), analog sensors eliminate firmware, protocol overhead, and pull-up resistors - they are typically preferred when the host MCU lacks free I2C buses, when a simple threshold comparator trip is sufficient, or when continuous analog proportional control is required.
Key features include a low 4 uA supply current that supports battery-powered and energy-harvesting applications, a wide operating range of -55C to +130C, and a slope of -11.77 mV/C (negative coefficient, meaning output voltage decreases as temperature rises). The device also offers +/-0.5C typical accuracy at 30C and +/-2.5C maximum accuracy across the full range, low self-heating due to the very low quiescent current, and 5-lead SC-70 (DCK) packaging for low-profile PCB assemblies.
The TMP20AIDCKR uses a precision bandgap reference and on-chip bipolar transistors in a proportional-to-absolute-temperature (PTAT) topology to produce the linear -11.77 mV/C output. This architecture provides superior noise rejection from the supply rail and enables predictable ADC conversion at the host MCU, since each ADC LSB corresponds to a known temperature increment based on the slope and ADC reference.
Typical applications include portable and battery-powered devices, HVAC thermistor replacement, environmental monitoring, and thermal protection of power components. The wide operating range and low quiescent current suit both consumer thermometers and industrial cold-chain loggers.
When designing with this part, place the decoupling capacitor as close as possible to the V+ pin and route the analog output trace away from switching nodes. Because the slope is negative and the output voltage at 25C is 1.315 V (typical), designers should account for the polarity in firmware linearization tables.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical analog-sensor design notes not found in the standalone manufacturer datasheet.
드롭인 대체품: TMP20AIDCKR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
TMP20AIDCKT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TMP20AIDCKR
✅ 드롭인✓ 재고 있음
$0.32 / 개
데이터시트 보기 →TMP20AIDCKR 최대 정격 & 전기적 특성
| 센서 유형 | Analog, Local |
| Sensing Temperature Range | -55C to +130C |
| Accuracy (Maximum) | +/-2.5C |
| 출력 유형 | Analog voltage |
| Output Slope | -11.77 mV/C (typical) |
| Output Voltage at 25C | 1.315 V (typical) |
| Supply Voltage Range | 2.7 V to 5.5 V (down to 1.8 V for 15C to 130C) |
| Supply Current (Quiescent) | 4 uA (typical) |
| 패키지 | SC-70-5 (DCK) |
| 실장 유형 | Surface Mount |
| 핀 수 | 5 |
| 동작 온도 | -55C to +150C (junction) |
| MSL 레벨 | 1 (260C, unlimited floor life per PartGenie) |
| RoHS 상태 | Compliant |
TMP20AIDCKR 핀 구성
| 핀 1 | V+ — Supply voltage input (2.7 V to 5.5 V) |
| 핀 2 | GND — Ground reference |
| 핀 3 | Vout — Analog temperature output voltage (linear, -11.77 mV/C slope) |
| 핀 4 | NC — Not connected (no internal bond) |
| 핀 5 | NC — Not connected (no internal bond) |
일반적인 애플리케이션
TMP20AIDCKR 적합 용도: 6 애플리케이션s: HVAC Thermostat Replacement, Portable Battery-Powered Thermometer, Cold-Chain Environmental Logger, Thermal Protection of Power Components, Industrial Process Monitoring, Consumer Wearable Temperature Monitoring.
HVAC Thermostat Replacement
The TMP20AIDCKR is well suited to HVAC thermistor replacement because its linear -11.77 mV/C analog output converts directly to temperature with no lookup table beyond a simple slope calculation. The 4 uA quiescent current is negligible compared to the thermostat's radio and display budget, and the -55C to +130C range covers both rooftop unit cold soak and furnace warm-up. Designers connect the output directly to a comparator or to the MCU ADC with an external reference; the slope is negative, so the firmware table must invert it before displaying Celsius.
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Portable Battery-Powered Thermometer
The TMP20AIDCKR is ideal for portable battery-powered thermometers because it draws only 4 uA typical supply current and operates as low as 1.8 V across 15C to 130C, which matches coin-cell voltage rails directly. The wide -55C to +130C sensing range handles both consumer fever thermometers and outdoor environment probes. The negative slope of -11.77 mV/C must be inverted in firmware, but the resulting display can resolve sub-degree changes with a 12-bit ADC.
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Cold-Chain Environmental Logger
The TMP20AIDCKR works well in cold-chain environmental loggers for pharmaceutical and food transport. Its -55C cold-floor capability and 4 uA quiescent current let a logger run for years on a single lithium primary cell while logging refrigerator, freezer, or shipping container temperatures. The wide supply range (2.7-5.5 V at full accuracy, 1.8 V at reduced) tolerates battery droop toward end-of-life.
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Thermal Protection of Power Components
The TMP20AIDCKR enables over-temperature shutdown detection for power MOSFETs, IGBTs, and battery packs. Place the SC-70-5 package adjacent to the hot spot, then connect its -11.77 mV/C output to a comparator whose threshold references the absolute shutdown temperature. Because the slope is negative, falling voltage indicates rising temperature - intuitive wiring for a crowbar or shutdown latch circuit.
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Industrial Process Monitoring
The TMP20AIDCKR fits industrial process monitoring where a 4-20 mA loop or PLC analog input requires an isolated, linear temperature transmitter. The 130C ceiling covers most hydraulic, motor-winding, and bearing-housing applications. Pair with a 4-20 mA transmitter IC and 24 V loop supply to convert the analog voltage output to a current loop. The device's +/-2.5C accuracy is acceptable for predictive maintenance alarms rather than closed-loop control.
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Consumer Wearable Temperature Monitoring
The TMP20AIDCKR is appropriate for consumer wearables monitoring skin or ambient temperature thanks to its small SC-70-5 footprint, 4 uA current, and 1.8 V minimum supply. The negative slope is fully linear so a simple two-point calibration in firmware is sufficient. Designs typically integrate the sensor near the skin contact area or in an airflow path for ambient readings, with the MCU waking periodically to sample.
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추천 제품 요약
엔지니어링 참조 데이터: TMP20AIDCKR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | TMP20AIDCKT |
|---|---|---|
| Package | SC-70-5 (DCK) | SC-70-5 (DCK) - same |
| Brand | Texas Instruments | Texas Instruments |
| Output Type | Analog voltage | Analog voltage |
| Temperature Range | -55C to +130C | -55C to +130C |
| Accuracy (max) | +/-2.5C | +/-2.5C |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Quiescent Current | 4 uA typical | 4 uA typical |
| Output Slope | -11.77 mV/C | -11.77 mV/C |
| Reel Quantity | 3000 (R suffix) | 250 (T suffix, smaller reel) |
주요 차별점
- Wide supply range down to 1.8 V (vs LM35)
- Very low quiescent current (vs LM35)
- Tiny SC-70-5 footprint (vs MCP9700)
설계 노트
Estimated: at the 2.7 V minimum supply and 4 uA typical quiescent current, the TMP20AIDCKR draws roughly 0.0108 mW continuously. On a 1000 mAh CR2477 coin cell this represents a baseline drain of about 35 mAh over 10 years - negligible compared to MCU self-discharge. Add a 100 nF ceramic decoupling capacitor as close as possible to the V+ pin to suppress ADC-induced droop during transient loads.
Route the analog Vout trace away from switching node signals (PWM, gate drivers, RF) to avoid coupling switching noise into the ADC input. For best noise immunity, place a small RC filter (10 kohm + 100 pF) right at the MCU ADC pin rather than at the sensor, so the capacitor's series resistance does not interact with the sensor's output impedance. Keep the GND path short and tie directly to the analog ground plane.
Do not assume the TMP20AIDCKR is pin-compatible with the LM35 or MCP9700 - both have different pin assignments on SC-70-5. The output slope is NEGATIVE (-11.77 mV/C), opposite to most legacy thermistor replacements (e.g. LM35 is +10 mV/C); firmware linearization tables must invert the slope. Without inversion, rising temperature reads as falling ADC codes and the controller will shut down on cold and run hot indefinitely.
Self-heating at 4 uA typical quiescent current is negligible (estimated < 0.01 C rise even in still air), but heat conducted from adjacent power devices can corrupt the reading. Place the part on a separate PCB region with thermal breaks, or use a copper keepout zone around the SC-70-5 footprint. For accurate cold-junction measurement in thermocouple circuits, mount the sensor isothermally with the reference junction.
규정 준수 정보
RoHS compliance confirmed per TI product page and distributor listings (DigiKey, Mouser, LCSC). Not AEC-Q100 qualified. MSL Level 1 per PartGenie listing (260C, unlimited floor life). Reach, halogen-free, and conflict-mineral status not explicitly stated in the verified web data - set to 'unknown'.
