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Home Products Resistors Chip Resistor - Surface Mount~~PT0805FR-070R142L~~

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PT0805FR-070R142L - YAGEO

Manufacturer Part Number: PT0805FR-070R142L

Manufacturer: Yageo

Allelco Part Number: 98D-PT0805FR-070R142L

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 39,856 pcs available, New & Original

Parts Description: RES 0.142 OHM 1% 1/8W 0805

Package: 0805

Data sheet: -

RoHs Status: ROHS3 Compliant

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Specifications

PT0805FR-070R142L Tech Specifications
YAGEO - PT0805FR-070R142L technical specifications, attributes, parameters and parts with similar specifications to YAGEO - PT0805FR-070R142L

Product Attribute	Attribute Value
Manufacturer	Yageo
Tolerance	±1%
Temperature Coefficient	±100ppm/°C
Supplier Device Package	0805
Size / Dimension	0.079" L x 0.049" W (2.00mm x 1.25mm)
Series	PT
Resistance	142 mOhms
Ratings	AEC-Q200
Power (Watts)	0.125W, 1/8W

Product Attribute	Attribute Value
Package / Case	0805 (2012 Metric)
Package	Tape & Reel (TR)
Operating Temperature	-55°C ~ 155°C
Number of Terminations	2
Height - Seated (Max)	0.026" (0.65mm)
Features	Automotive AEC-Q200, Current Sense, Moisture Resistant
Failure Rate	-
Composition	Thick Film

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8533.21.0030

Frequently Asked Questions(FAQ)

What makes the PT0805FR-070R142L suitable for automotive current sensing applications compared to standard resistors?: The PT0805FR-070R142L is specifically designed for current sensing in automotive environments through several integrated characteristics. Its 142 milliohm resistance value combined with 1% tolerance ensures predictable voltage drop across the resistor for accurate current measurement via Ohm's law calculations. The AEC-Q200 qualification confirms it meets automotive reliability standards for temperature cycling, thermal shock, and long-term stability. The thick film construction with moisture resistance (MSL 1) prevents performance degradation in high-humidity underhood conditions. At 1/8W rated power, the PT0805FR-070R142L dissipates 142 mW at 1A full-scale current—a thermally manageable level for PCB integration without requiring isolated thermal zones, making it practical for battery management systems, motor controllers, and DC-DC converter monitoring circuits.

How does the ±100ppm/°C temperature coefficient of the PT0805FR-070R142L affect current sensing accuracy across the -55°C to 155°C automotive operating range?: The PT0805FR-070R142L exhibits ±100ppm/°C drift, meaning resistance changes by approximately 0.01% per degree Celsius. Across the full -55°C to 155°C range (210°C span), maximum resistance variation reaches ±2.1%, or roughly ±3 milliohms from the nominal 142 milliohms. For a 1A sense current, this translates to approximately ±3mV error at temperature extremes. Modern automotive microcontrollers compensate for this through firmware calibration tables or real-time temperature correction, especially in battery pack monitoring where the PT0805FR-070R142L is exposed to thermal cycling. The ±1% initial tolerance of the PT0805FR-070R142L (±1.42 milliohms) combined with temperature drift means designers typically select current-sense amplifiers with input-offset temperature coefficients below 10µV/°C to keep the amplifier error subordinate to resistor drift.

Can the PT0805FR-070R142L handle peak current transients, or is the 1/8W rating a strict limit?: The PT0805FR-070R142L 1/8W (0.125W) continuous power rating defines sustained dissipation under normal thermal conditions. Transient peak currents can exceed the continuous limit briefly without damage, provided the energy content remains within the resistor's thermal time constant. A short pulse at 2–3A through the PT0805FR-070R142L (dissipating 0.57–1.3W for microseconds) typically remains within safe limits if repetition is infrequent. However, the small 0805 package size (2.0mm × 1.25mm) limits heat spreading; sustained operation above 1/8W causes junction temperature to rise rapidly. In automotive motor-control applications, designers pair the PT0805FR-070R142L with parallel resistors or upgrade to larger packages (1206 or 1210) when peak-current measurement above 2A is routine. The AEC-Q200 rating ensures the PT0805FR-070R142L maintains mechanical and electrical integrity under rated thermal stress, but exceeding power ratings voids this qualification.

How does the PT0805FR-070R142L compare to a 0.15Ω resistor in terms of measurement sensitivity for automotive load-current monitoring?: A 0.15Ω resistor generates 150mV at 1A, while the PT0805FR-070R142L produces 142mV—an 8mV difference (5.3% lower signal). In 12V automotive systems, this 8mV reduction is marginal for modern ratiometric ADCs; however, in 3.3V battery-management systems, every millivolt counts. The PT0805FR-070R142L's lower resistance reduces signal noise by approximately 7% (proportional to the voltage-divider effect) and minimizes self-heating—a critical advantage in thermal-limited applications. Conversely, a 0.15Ω resistor (if available in automotive-grade thick film) offers easier signal conditioning with off-the-shelf transimpedance amplifiers calibrated for standard values. The PT0805FR-070R142L's non-standard 142mΩ value requires custom amplifier gain settings or digital calibration, adding firmware complexity. For high-current applications (>5A), the PT0805FR-070R142L's lower power dissipation and reduced PCB heating make it preferable; for low-current precision monitoring (<500mA), the 0.15Ω alternative may simplify circuit design despite slightly higher self-heating.

What is the moisture sensitivity risk of the PT0805FR-070R142L in conformal-coated versus potted automotive modules?: The PT0805FR-070R142L carries MSL 1 (Unlimited) moisture sensitivity, indicating it can absorb atmospheric moisture indefinitely without performance degradation or cracking risk during thermal shock. This exceptional rating stems from the thick film construction and YAGEO's moisture-resistant formulation. In conformal-coated modules, the PT0805FR-070R142L requires no special bake-out protocols before assembly; standard production practices suffice. In potted modules, the PT0805FR-070R142L does not require pre-baking before encapsulation, eliminating a manufacturing step that would otherwise add cost and lead time. This MSL 1 compliance is a practical advantage over some film resistors or specialty sense resistors that carry MSL 2 or 3 ratings, which mandate controlled storage, humidity limits, and floor-life restrictions. For automotive suppliers managing global supply chains with variable storage conditions, the PT0805FR-070R142L simplifies inventory management and reduces risk of moisture-induced field failures—a significant reliability benefit in high-volume production.

Why does the PT0805FR-070R142L use thick film construction rather than wirewound for current sensing?: Wirewound resistors offer lower temperature coefficients (±25ppm/°C) and tighter tolerances but introduce parasitic inductance (typically 2–5nH for 0805-equivalent sizes), causing impedance to rise with frequency and creating ringing artifacts in transient current measurements. The PT0805FR-070R142L thick film design minimizes inductance (<0.5nH) and is inherently non-inductive, making it suitable for high-bandwidth current sensing in motor-drive PWM environments (switching frequencies 10–20kHz). Wirewound sense resistors also exhibit lower power density per unit volume, requiring larger packages for 1/8W ratings. The PT0805FR-070R142L's compact 0805 form factor and thick film composition allow efficient integration into space-constrained automotive PCBs without sacrificing thermal performance. The ±100ppm/°C drift of the PT0805FR-070R142L is acceptable for automotive applications where firmware compensation and digitally-filtered measurements mitigate thermal errors. Wirewound alternatives introduce cost and assembly complexity that are not justified in volume automotive designs where the PT0805FR-070R142L's performance envelope satisfies system requirements.

How should PCB layout be optimized when using the PT0805FR-070R142L in a high-current battery-disconnect switch monitoring circuit?: The PT0805FR-070R142L's 2.0mm × 1.25mm footprint must be positioned directly in the current path with minimal PCB trace resistance to avoid parasitic sensing errors. Ideal layout places the PT0805FR-070R142L between the battery input and the main load, with current-sense amplifier inputs connected via short, symmetric traces to the resistor pads to reject common-mode noise. Trace resistance should remain below 0.5mΩ per side (totaling <1mΩ) to keep parasitic error below 0.7% of the PT0805FR-070R142L's nominal value. The PCB ground plane must extend directly beneath and around the PT0805FR-070R142L to provide low-impedance return paths and minimize voltage measurement errors from loop inductance. At 50A transient currents, the PT0805FR-070R142L dissipates up to 0.36W; thermal vias (minimum 0.3mm diameter, 8–12 vias per resistor pad) increase heat spreading to the PCB copper layers and reduce junction temperature rise by 30–40°C. Placing the PT0805FR-070R142L away from high-temperature components (FETs, inductors) prevents self-heating from coupled thermal radiation, which can degrade the ±1% tolerance accuracy during transient measurements.

What amplifier input-referred noise characteristics are required to avoid degrading the signal-to-noise ratio of a PT0805FR-070R142L current-sense channel?: At 1A full-scale, the PT0805FR-070R142L generates 142mV across its terminals. A 12-bit automotive ADC (≈35µV LSB at 3.3V reference) requires amplifier noise to remain below 10µV RMS to maintain 10-bit effective resolution. Many integrated current-sense amplifiers (e.g., TI INA2xx, Analog Devices AD8215) specify input-referred noise at 100–400µV/√Hz; at typical 10kHz bandwidth, cumulative noise reaches 100–150µV RMS. This noise floor consumes approximately 3 ADC LSBs, reducing effective resolution from 12 bits to ~9 bits. To preserve 10-bit accuracy with the PT0805FR-070R142L, designers implement low-pass filtering on the amplifier output (cutoff ~1kHz) and oversampling (×4 at minimum) in firmware. Chopper-stabilized amplifiers (offset <10µV, <50µV/√Hz noise) eliminate 1/f noise and improve resolution at the cost of slightly higher power consumption—often justified in battery-management systems where the PT0805FR-070R142L measurements control charge/discharge logic. For single-supply automotive supplies without precision references, ratiometric measurement techniques (sensing PT0805FR-070R142L voltage relative to the supply rail) improve noise immunity by 20–30% compared to absolute measurement.

Is the PT0805FR-070R142L suitable for direct substitution in designs originally specified with a 0.1Ω current-sense resistor?: Direct substitution of the PT0805FR-070R142L for a 0.1Ω resistor is not recommended without circuit redesign. The PT0805FR-070R142L exhibits 42% higher resistance (142mΩ vs. 100mΩ), producing proportionally higher voltage drop and self-heating at identical currents. An amplifier gain-setting resistor network calibrated for 0.1Ω will introduce 42% systematic error in current measurement if the PT0805FR-070R142L is installed without adjusting the transimpedance ratio. Additionally, the PT0805FR-070R142L's ±1% tolerance stack may exceed the original design's error budget if the 0.1Ω resistor specified tighter tolerances (e.g., ±0.5%). However, if the original design employed a 0.1Ω resistor rated only for industrial temperature ranges (-40°C to 85°C), upgrading to the automotive-qualified PT0805FR-070R142L improves reliability across the full -55°C to 155°C automotive range, provided firmware calibration constants are recalculated. The PT0805FR-070R142L should be selected during initial design rather than as a late-stage substitution to avoid integration risk and rework.

How do RoHS3 compliance and REACH unaffected status of the PT0805FR-070R142L impact supply-chain sourcing and long-term availability?: The PT0805FR-070R142L carries RoHS3 compliance (Directive 2015/863/EU), confirming absence of six restricted substances (Pb, Cd, Hg, Cr(VI), PBB, PBDE) and compliance with phthalate restrictions, ensuring compatibility with automotive OEM procurement policies across EU and global markets. REACH Unaffected status means the PT0805FR-070R142L neither contains substances of very high concern (SVHC) nor requires supplier declaration under REACH Article 33, streamlining documentation for Tier-1 suppliers. Together, these regulatory qualifications signal long-term design confidence; components with RoHS3 and REACH compliance typically remain in production for 5–10+ years, reducing obsolescence risk compared to non-compliant alternatives. For automotive manufacturers managing multi-year platform lifecycles, the PT0805FR-070R142L's regulatory standing eliminates the need for mid-platform design refreshes due to supply restrictions. The AEC-Q200 rating, combined with RoHS3 and REACH compliance, positions the PT0805FR-070R142L as a low-risk, high-confidence component choice for both new designs and platform carry-overs, reducing supply-chain complexity and supporting cost stability across production volumes.

What failure modes should be anticipated if the PT0805FR-070R142L is operated beyond its 1/8W power rating in sustained high-current battery applications?: Sustained operation of the PT0805FR-070R142L above 0.125W causes junction temperature to rise exponentially, potentially exceeding 200–300°C within seconds in poorly thermally managed layouts. Initial degradation manifests as ±1% tolerance drift toward the +1% extreme (resistance increasing) as the thick film resistive material exhibits positive temperature coefficient effects at elevated temperatures. Continued overstress causes the PT0805FR-070R142L's resistance to climb an additional 5–10% over minutes, introducing 7–14% measurement error that corrupts battery management algorithms relying on current feedback. At extreme temperatures (>300°C), the glass-ceramic substrate of the PT0805FR-070R142L undergoes micro-cracking, eventually leading to open-circuit failure or intermittent contact. The AEC-Q200 rating of the PT0805FR-070R142L explicitly defines maximum junction temperature limits; operation beyond these limits voids automotive qualification and introduces field-failure risk. High-current designs requiring continuous currents >1.5A should migrate to larger packages (1206 or 1210) or parallel multiple PT0805FR-070R142L resistors (two in parallel yield 71mΩ at doubled power capacity) to distribute thermal load and maintain reliable operation within design specifications.

How does the PT0805FR-070R142L's 0805 footprint compare to miniature alternatives in automotive PCB space-constrained applications?: The PT0805FR-070R142L occupies 2.0mm × 1.25mm (0805 metric), representing industry-standard real estate for compact current sensing. Smaller packages (0603, 0402) offer 30–50% area reduction but impose severe thermal constraints; a 0603 variant dissipating equivalent power would reach junction temperatures 40–60°C higher due to reduced copper contact area and slower heat diffusion. Larger packages (1206, 1210) provide superior thermal performance but consume 2–3× PCB area, often conflicting with space budgets in compact automotive modules (battery pack controllers, inverter drivers). The PT0805FR-070R142L's 0805 footprint represents an optimal compromise, balancing thermal dissipation capacity for up to 1/8W sustained operation with practical PCB integration in multi-layer boards (4–6 layers typical in automotive). For designs targeting under-seat or under-hood mounting where thermal management is challenging, the PT0805FR-070R142L allows strategic placement near main current paths without requiring oversize thermal planes. In contrast, oversized packages (2512, 2010) introduce parasitic inductance and complicate high-speed PWM current measurement due to increased loop area. The PT0805FR-070R142L's 0805 standardization also ensures component availability across multiple suppliers and geographies, reducing supply-chain fragility compared to non-standard package sizes.

What is the practical voltage measurement accuracy achievable with the PT0805FR-070R142L when integrated into a 24V heavy-duty automotive current-sensing circuit?: In 24V heavy-duty systems (trucks, construction equipment), a PT0805FR-070R142L sense resistor carrying 50A generates 7.1V across its terminals—a relatively large signal compared to 12V automotive systems. Voltage measurement error arises from multiple sources: the PT0805FR-070R142L's ±1% tolerance (±1.42mΩ), amplifier offset (typically 1–5mV for automotive-grade devices), and ADC quantization. For a 16-bit ADC with 5V reference (≈76µV/LSB), the voltage across the PT0805FR-070R142L requires a gain stage to map to optimal ADC input range. With gain set to 1 (direct measurement), 7.1V = approximately 93,000 ADC codes, yielding current resolution of ~5.4mA per LSB—more than adequate for heavy-duty monitoring. However, if the PT0805FR-070R142L is measured through a 4–20mA transmitter circuit (common in industrial 24V systems), the transmitter's nonlinearity becomes the dominant error source (0.3–0.5% typical). The PT0805FR-070R142L's ±1% tolerance and ±100ppm/°C drift become secondary concerns in this architecture. For direct voltage measurement (amplifier + ADC), the PT0805FR-070R142L combined with ratiometric measurement against the 24V supply achieves ±2–3% absolute accuracy, sufficient for diagnostics and load-shedding logic typical in heavy-duty battery management.

Parts with Similar Specifications

The three parts on the right have similar specifications to YAGEO PT0805FR-070R142L

Product Attribute
Part Number	PT0805FR-070R12L	PT0805FR-070R14L	PT0805FR-070R182L	PT0805FR-070R249L
Manufacturer	YAGEO	YAGEO	YAGEO	YAGEO
Series	-	-	-	-
Failure Rate	-	-	-	-
Features	-	-	-	Simultaneous Sampling
Temperature Coefficient	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Power (Watts)	-	-	-	-
Height - Seated (Max)	-	-	-	-
Composition	-	-	-	-
Tolerance	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Size / Dimension	-	-	-	-
Ratings	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Number of Terminations	-	-	-	-
Resistance	-	-	-	-

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