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HomeProductsResistorsChip Resistor - Surface MountRM12F6982CT
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RM12F6982CT - Cal-Chip Electronics, Inc.

Manufacturer Part Number
RM12F6982CT
Manufacturer
CAL-CHIP ELECTRONICS INC.
Allelco Part Number
98D-RM12F6982CT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
30,000 pcs available, New & Original
Parts Description
RES SMD 69.8K OHM 1% 1/4W 1206
Package
1206
Data sheet
-
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 30000
  • Unit Price: $0.003
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.003 $0.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

RM12F6982CT Tech Specifications
Cal-Chip Electronics, Inc. - RM12F6982CT technical specifications, attributes, parameters and parts with similar specifications to Cal-Chip Electronics, Inc. - RM12F6982CT

Product Attribute Attribute Value
Manufacturer CAL-CHIP ELECTRONICS INC.
Tolerance ±1%
Temperature Coefficient ±100ppm/°C
Supplier Device Package 1206
Size / Dimension 0.122" L x 0.061" W (3.10mm x 1.55mm)
Series RM
Resistance 69.8 kOhms
Ratings -
Product Attribute Attribute Value
Power (Watts) 0.25W, 1/4W
Package / Case 1206 (3216 Metric)
Package Tape & Reel (TR)
Operating Temperature -55°C ~ 155°C
Number of Terminations 2
Height - Seated (Max) 0.026" (0.65mm)
Features -
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)

How does the RM12F6982CT 69.8 kOhm resistor perform in precision analog signal conditioning circuits where temperature stability matters?
The RM12F6982CT exhibits a temperature coefficient of ±100 ppm/°C, which translates to approximately ±0.7 kOhms of drift across its full operating range of -55°C to 155°C. In analog signal chains, this drift manifests as gain error in transimpedance amplifiers or biasing inaccuracy in precision measurement frontends. For a transimpedance amplifier with 69.8 kOhm feedback resistor, the 1% initial tolerance combined with temperature drift can produce cumulative measurement error of approximately 1.7% at temperature extremes. To mitigate this, consider pairing the RM12F6982CT with temperature-compensated op-amp topologies or selecting precision resistor networks when applications demand sub-1% stability across temperature.
What are the key differences between the RM12F6982CT thick film resistor and thin film alternatives for high-frequency RF filtering?
The RM12F6982CT uses thick film construction, which offers superior power handling at the 0.25W rating and excellent cost scaling compared to thin film equivalents. However, thick film resistors exhibit frequency-dependent impedance behavior and higher parasitic inductance due to construction geometry, making them less suitable for RF applications above 100 MHz where impedance flatness is critical. The RM12F6982CT's 1206 package (3.10mm × 1.55mm) introduces approximately 0.5 nH of lead inductance, causing impedance rise at GHz frequencies. For precision RF impedance matching below 100 MHz, the RM12F6982CT performs adequately; above this range, thin film resistors in smaller packages (0805 or 0603) provide better frequency response, though at reduced power dissipation ratings.
Can the RM12F6982CT be safely used in 5V logic circuits with continuous current flow, and what power dissipation margin exists?
At 5V across the RM12F6982CT, the resistor dissipates approximately 0.357W (P = V²/R = 25/69,800), which exceeds the rated 0.25W capability by 43%. This overpower condition will cause rapid thermal runaway, leading to resistance drift, potential open-circuit failure, or PCB pad damage. To operate safely in 5V circuits, the RM12F6982CT requires either series resistance (introducing a voltage divider that reduces actual dissipation to ~0.18W across both resistors combined) or parallel resistor configurations that share current. Alternatively, select a lower resistance value (47 kOhm range) or higher power rating (0.5W) to maintain safe operating margins. For circuits where the 69.8 kOhm value is non-negotiable, operating voltage should be limited to approximately 4.2V to keep dissipation below 0.25W.
How does moisture sensitivity (MSL 1) of the RM12F6982CT affect PCB assembly and storage procedures?
The RM12F6982CT carries MSL Level 1 rating, indicating unlimited floor life and no post-reflow baking requirement—a significant advantage for high-volume assembly and Just-In-Time logistics. MSL 1 means the component absorbs negligible moisture during storage at room humidity, eliminating the desorption step that higher MSL ratings require. This allows continuous component usage from bulk reels without desiccant cabinet management or pre-reflow bake cycles (typically 3–4 hours at 125°C for MSL 3 devices). However, the RM12F6982CT should still be stored in climate-controlled areas (20–25°C, <60% RH) to prevent accelerated aging and oxidation of termination plating. For supply chain resilience, MSL 1 status means the RM12F6982CT can tolerate longer lead times and variable warehouse conditions better than moisture-sensitive alternatives.
What is the actual effective resistance tolerance when combining the RM12F6982CT's ±1% initial tolerance with its ±100 ppm/°C temperature coefficient?
The RM12F6982CT begins at 69.8 kOhms with ±1% tolerance, defining a nominal range of 69.1–70.5 kOhms at 25°C. Temperature coefficient of ±100 ppm/°C introduces additional drift: at -55°C (80°C below reference), typical drift is -400 ppm (-27.9 Ohms), and at +155°C (130°C above reference), drift reaches +520 ppm (+36.3 Ohms). Worst-case stack analysis places the RM12F6982CT between 69.07 kOhms (low tolerance, negative drift) and 70.54 kOhms (high tolerance, positive drift) across its operating envelope. This represents a total combined tolerance of approximately ±1.7% when design margins account for both tolerance and temperature effects. For filtering applications where cutoff frequency depends on R×C product, this variance shifts corner frequency by ~±1.7%, potentially missing target bandwidth specifications by >150 Hz in low-frequency audio filters.
How does the RM12F6982CT perform in high-temperature industrial applications near 155°C, and what failure modes should be anticipated?
The RM12F6982CT is rated to 155°C maximum, but operation near this limit accelerates multiple failure mechanisms. At sustained 155°C, the thick film resistive paste undergoes accelerated oxidation and metal-oxide interface degradation, typically causing 5–10% resistance increase over 5,000 operating hours—far exceeding the ±1% tolerance band. Solder joint reliability also degrades significantly; lead-free solder (SAC305) exhibits creep acceleration above 150°C, risking intermittent open circuits or increased contact resistance within 2–3 years in high-vibration environments. The RM12F6982CT's 0.026" seated height and 1206 package size create mechanical stress concentration during thermal cycling, particularly in applications with >50°C/hour ramp rates. For sustained high-temperature operation (>130°C continuous), consider derating the component to 80% of rated resistance value in circuit calculations, or specify precision thick film resistors with explicit high-temperature stability data.
Why might the RM12F6982CT produce unexpected noise in precision instrumentation amplifier designs?
Thick film resistors like the RM12F6982CT generate 1/f noise (pink noise) due to current-dependent defects in the resistive paste matrix, typically producing noise spectral density around 10–50 nV/√Hz at 1 kHz. In a transimpedance amplifier with 69.8 kOhm feedback, this translates to approximately 700 nV/√Hz output-referred noise (noise from RM12F6982CT amplified by feedback factor). For picoammeter applications requiring sub-100 fA/√Hz input-referred sensitivity, the RM12F6982CT alone contributes ~10 fA/√Hz noise floor, potentially dominating total system noise budget. Metal film resistors produce significantly lower 1/f noise (~2–5 nV/√Hz), but the RM12F6982CT's thicker film construction and size limit noise performance. Designers mitigating this should use parallel arrays of RM12F6982CT units (reducing noise by √n factor) or substitute thin film equivalents for the feedback path while retaining RM12F6982CT for non-critical biasing resistors.
How should the RM12F6982CT be specified in high-reliability or aerospace applications, and what additional certifications are required?
The RM12F6982CT carries RoHS3 and REACH compliance but lacks explicit aerospace qualification (AS9100 or MIL-PRF-55182 certification). For high-reliability applications, the bare commercial RM12F6982CT does not meet DO-160G or MIL-STD-1916 incoming inspection protocols. To use the RM12F6982CT in aerospace or military contexts requires establishing a qualified parts list (QPL) through the procurement specification, implementing 100% visual inspection, electrical test parameters matching design margins (likely tightening tolerance to ±0.5%), and environmental stress screening including thermal cycling. The thick film construction itself is acceptable for Level 1–2 reliability, but the RM12F6982CT must be procured through certified distribution channels with Certificate of Conformance (CoC) and traceability to manufacturing lot. Lead times and costs increase 3–5× when sourcing RM12F6982CT equivalents through aerospace-qualified channels compared to standard commercial distribution.
What is the practical thermal management approach when the RM12F6982CT must dissipate near its 0.25W rating on a standard PCB?
At 0.25W dissipation in a 1206 package, the RM12F6982CT operates near its thermal limit without additional cooling. Assuming 2 oz copper (70 µm thickness) and standard PCB thermal resistance of approximately 250°C/W for a 1206 resistor, the component surface rises roughly 62°C above ambient when dissipating 0.25W. In a 25°C ambient environment, this places the RM12F6982CT at approximately 87°C, well within its 155°C rating but accelerating aging. To reduce thermal stress, implement copper pour areas (minimum 3 mm × 3 mm pads) connected to the resistor terminations, reducing effective thermal resistance to ~180°C/W and lowering junction temperature to approximately 70°C. In high-density boards, thermal relief vias (0.3 mm diameter, spaced 0.5 mm) beneath the RM12F6982CT pad connect to internal ground planes, further reducing junction temperature by 10–15°C. Thermal modeling software can verify junction temperature; if sustained operation above 100°C is required, consider splitting the 69.8 kOhm load across two parallel RM12F6982CT units, halving power dissipation per component.
How does the RM12F6982CT's 1% tolerance compare functionally to 5% tolerance resistors in typical signal conditioning filters, and when does the upgrade justify cost?
A standard 5% tolerance 69.8 kOhm resistor creates cutoff frequency uncertainty of approximately ±5% in an RC low-pass filter (assuming ideal capacitor). The RM12F6982CT's ±1% tolerance reduces this uncertainty to ±1%, tightening the cutoff frequency range from ±3.45 kHz (at 69 kHz nominal cutoff) to ±690 Hz. For anti-aliasing filters preceding 16-bit ADCs, the ±1% tolerance ensures the filter corner frequency remains within specification across production batches, eliminating yield loss from out-of-spec units. Cost differential is typically 15–40% higher for the RM12F6982CT versus 5% equivalents. The justification threshold occurs when either: (1) production volume exceeds 50,000 units (amortizing incoming test cost), (2) filter specification requires <±2% frequency accuracy, or (3) design relies on the RM12F6982CT to meet gain accuracy requirements in transimpedance stages. For single-unit prototypes or applications with ±5% acceptable variation, the cost upgrade to RM12F6982CT provides minimal functional value.
What environmental and storage conditions optimize long-term reliability of the RM12F6982CT in warehouse inventory?
The RM12F6982CT, rated MSL 1, exhibits exceptional storage stability. Optimal warehouse conditions maintain 20–25°C and <60% relative humidity; however, MSL 1 rating permits relaxed storage protocols compared to higher MSL components. Accelerated life testing data for thick film resistors shows negligible resistance shift (<0.05%) after 12 months at 25°C/65% RH. The RM12F6982CT should be stored in original tape-and-reel packaging (as supplied) to prevent oxidation of nickel-plated terminations; exposure to industrial atmospheres containing sulfur compounds can cause tarnishing and increased contact resistance over 2–3 years. Temperature cycling between storage areas (e.g., unheated warehouses fluctuating 5–35°C) does not degrade the RM12F6982CT but may accelerate solder joint fatigue when component is reflowed multiple times post-storage. For extended inventory (>3 years), periodic rotation of stock using first-in-first-out (FIFO) protocols minimizes age-related degradation. The RM12F6982CT stored under these conditions maintains <0.5% resistance drift, supporting high-reliability applications without incoming requalification.
How do parasitic effects in the RM12F6982CT impact performance in switched-mode power supply (SMPS) feedback networks?
The RM12F6982CT exhibits parasitic series inductance (approximately 0.5–1 nH) and parallel capacitance (0.2–0.5 pF) due to its 1206 package geometry and thick film construction. In SMPS feedback dividers operating at 500 kHz switching frequency, this inductance introduces impedance rise of approximately 1.6–3.2 mOhms at the switching frequency. The impedance rise causes high-frequency attenuation of the feedback signal, reducing loop bandwidth and slowing transient response to load step changes. For a typical buck converter with 12V output and RM12F6982CT in the feedback divider, the parasitic inductance contributes approximately 50–100 mV overshoot during 10A load transients, potentially triggering output voltage limit violations. To mitigate, place a 100 nF ceramic capacitor directly across the RM12F6982CT's feedback network nodes, creating a low-impedance path for switching frequency harmonics and reducing their coupling to the op-amp input. Alternatively, select thin film resistor networks specifically designed for SMPS applications, which integrate matched elements with controlled parasitic coupling and lower effective inductance.

Parts with Similar Specifications

The three parts on the right have similar specifications to Cal-Chip Electronics, Inc. RM12F6982CT

Product Attribute RM12F69R8CT RM12F6980CT RM12F6812CT RM12F6981CT
Part Number RM12F69R8CT RM12F6980CT RM12F6812CT RM12F6981CT
Manufacturer Cal-Chip Electronics, Inc. Cal-Chip Electronics, Inc. Cal-Chip Electronics, Inc. Cal-Chip Electronics, Inc.
Series - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Power (Watts) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Temperature Coefficient - - - -
Resistance - - - -
Features - - - Simultaneous Sampling
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Composition - - - -
Number of Terminations - - - -
Height - Seated (Max) - - - -
Size / Dimension - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Ratings - - - -
Tolerance - - - -

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RM12F6982CT Image

RM12F6982CT

Cal-Chip Electronics, Inc.
98D-RM12F6982CT

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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