RT0402CRD079R09L - 9.09 Ohm Thin Film Chip Resistor | YAGEO
MPN: RT0402CRD079R09L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.1 | $0.10 |
| 10 | $0.09 | $0.90 |
| 100 | $0.08 | $8.00 |
| 500 | $0.07 | $35.00 |
| 1,000 | $0.06 | $60.00 |
| 5,000 | $0.05 | $250.00 |
RT0402CRD079R09L Overview
A thin-film resistor is a passive component whose resistive element is a sputtered metal-alloy film, typically nickel-chromium, deposited on a ceramic substrate. Because the film is patterned by photolithography rather than by composition variation as in thick-film resistors, thin-film parts deliver tighter absolute tolerance, lower temperature coefficient of resistance (TCR), and markedly lower current noise. Within the broader taxonomy, this device is a chip resistor -> surface-mount resistor -> passive component -> electronic component, and YAGEO's RT series is the company's precision thin-film line.
Key features include the plus-or-minus 0.25 percent tolerance, a 0402 footprint measuring 1.0 mm by 0.5 mm, and the moisture-resistant thin-film construction typical of the YAGEO RT family. The series is qualified for reflow soldering at peak temperatures up to 260 degrees Celsius and is RoHS compliant. Although YAGEO's general thin-film rating for the 0402 case size is 1/16 W (0.063 W) at 70 degrees Celsius, designers must derate to zero power at the upper operating temperature of 155 degrees Celsius per the RT datasheet.
The RT0402CRD079R09L uses the same NiCr film technology as other parts in the RT family, which YAGEO documents at TCR values as low as plus-or-minus 25 ppm per degree Celsius and very low current noise of less than minus 35 dB. The 9.09 Ohm value is part of the standard E96 resistance series, allowing tight tolerance and low drift in precision analog circuits such as feedback networks, current-sense shunts, and reference-setting dividers.
Typical applications include precision analog front-ends, sensor-signal conditioning, current-sense paths for low-voltage rails, precision gain-setting resistor pairs in instrumentation amplifiers, and test-and-measurement reference dividers. The 0.1 percent-class stability over time (per the RT family long-term drift data) also makes it suitable for load-cell and weighing-scale analogue signal chains.
When designing with this part, observe the manufacturer's derating curve by reducing applied power as the ambient temperature approaches 155 degrees Celsius, and select adjacent series values such as 9.10 Ohm or 9.05 Ohm if the E96 9.09 Ohm nominal is unavailable across preferred suppliers. Use a copper pad geometry that matches the 0402 land-pattern recommendation to avoid tombstoning during reflow.
This page synthesises distributor availability, drop-in alternatives, and the manufacturer's derating guidance into a single engineer-focused reference that complements the official datasheet.
Drop-in alternatives for RT0402CRD079R09L — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
RT0402BRE079R09L
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
RT0402DRD079R09L
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
RT0402FRD079R09L
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
RT0402CRD079R90L
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ERA-2AEB9R09X
✅ Drop-In📋 Reference alternative (not in catalog)
PTN0402E7009R09L
✅ Drop-In📋 Reference alternative (not in catalog)
RT0402CRD079R09L Maximum Ratings & Electrical Characteristics
| Resistance | 9.09 Ohms |
| Tolerance | plus-or-minus 0.25 percent |
| Power Rating | 0.063 W (1/16 W) |
| Package / Case | 0402 (1005 Metric) |
| Package Size | 1.0 mm x 0.5 mm |
| Resistor Technology | Thin Film |
| Mounting Type | Surface Mount (SMT) |
| Temperature Coefficient | plus-or-minus 25 ppm/degree Celsius (RT family typical) |
| Operating Temperature | -55 degrees Celsius to +155 degrees Celsius (RT family) |
| Current Noise | less than -35 dB (RT family typical) |
| Number of Resistors | 1 |
| Number of Pins / Terminations | 2 |
| Termination Style | Solder pad (Ni/Au or Sn finish typical) |
| Moisture Sensitivity Level | MSL 1 (per RT family) |
| Reflow Peak Temperature | 260 degrees Celsius (per RT family) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Halogen Free | Yes |
| REACH Compliance | Compliant (per YAGEO product page) |
| Resistance Series | E96 |
RT0402CRD079R09L Pin Configuration
| Pin 1 | TermA — Resistor terminal A (left pad per YAGEO RT0402 drawing) |
| Pin 2 | TermB — Resistor terminal B (right pad per YAGEO RT0402 drawing) |
Typical Applications
RT0402CRD079R09L is suitable for 7 applications: Precision Current-Sense Shunt, Instrumentation Amplifier Gain-Setting Resistor, Precision Reference Voltage Divider, Sensor Signal-Conditioning Network, Audio DAC Output Filter / I-to-V Convertor, Switched-Mode Power Supply Feedback Network, Test-and-Measurement Calibration Path.
Precision Current-Sense Shunt
The YAGEO RT0402CRD079R09L is well suited to low-side current-sense shunt roles in precision DC power monitoring and battery-management boards. Its 9.09 Ohm value, plus-or-minus 0.25 percent tolerance, and 25 ppm per degree Celsius TCR keep the sense gain stable over thermal cycling, while the 0402 footprint lets it sit adjacent to the shunt traces on a compact PCB. In a typical 100 mA to 1 A rail-monitoring path, the 1/16 W (0.063 W) power ceiling accommodates up to ~83 mA continuous (I-squared-R for 9.09 Ohm). Use a paired instrumentation amplifier such as INA212 or AD8205 (paired for low drift) to read the millivolt drop. Compared with thick-film alternatives, the thin-film NiCr construction halves the noise contribution and improves long-term drift.
Recommended
Instrumentation Amplifier Gain-Setting Resistor
In instrumentation amplifiers and precision differential circuits, RT0402CRD079R09L serves as a stable gain-setting reference because of its thin-film construction, low TCR (25 ppm/degree Celsius), and tight 0.25 percent tolerance. When paired with matched values such as the RT0402CRD07990RL family parts, the resistor provides a low-noise, drift-stable contribution to the amplifier gain equation, which is critical for instrumentation op-amps like INA128, INA333, or AD8421. The 0402 footprint keeps board area minimal while the moisture-resistant thin-film construction protects against reflow drift. This makes RT0402CRD079R09L a strong fit for weigh-scale, bridge-sensor, and medical instrumentation front-ends demanding sub-100 ppm matched gain accuracy.
Recommended
Precision Reference Voltage Divider
The RT0402CRD079R09L works as the lower arm of a precision voltage divider when a stable ratio is required between a known voltage reference (for example, REF5025 or LM4040) and the ADC reference input of an SAR or Delta-Sigma converter. The thin-film 9.09 Ohm value allows construction of low-impedance dividers that minimise amplifier input-bias-current errors, while the 25 ppm per degree Celsius TCR keeps the divided voltage stable over wide temperature ranges. The 1/16 W (0.063 W) rating easily handles the small divider currents typical in reference-trim paths. Combined with a same-series 1.00 kOhm or 10.0 kOhm part (RT family), the resistor provides matched TC tracking, an advantage thick-film resistors cannot match.
Recommended
Sensor Signal-Conditioning Network
RT0402CRD079R09L functions as a series or shunt element in a Wheatstone bridge excitation or load-cell conditioning network where long-term stability and low noise are critical. Its 9.09 Ohm value and 25 ppm per degree Celsius TCR combine with matched half-bridge partners to give a scale factor that drifts only a few ppm per degree Celsius, supporting accurate weighing and force-sensing designs. The 0402 outline enables PCB-side placement directly beneath the load-cell flexure, minimising trace-induced errors. The resistor's low current noise (less than -35 dB) makes it ideal for amplifying low-level cell signals with chopper-stabilised front-ends like NAU7802 or HX711.
Recommended
Audio DAC Output Filter / I-to-V Convertor
In high-end audio DAC output stages, RT0402CRD079R09L serves as the input resistor of an I-to-V converter when paired with a low-noise op-amp such as OPA1612 or LME49710. The thin-film 9.09 Ohm value with plus-or-minus 0.25 percent tolerance translates the DAC current output into a low-impedance voltage suitable for the next gain stage. The 25 ppm per degree Celsius TCR keeps the audio gain stable during warm-up, while the 0402 surface-mount package keeps the layout compact near the DAC output pins. Compared with carbon-film or thick-film alternatives, the NiCr thin-film construction contributes negligibly to THD+N.
Recommended
Switched-Mode Power Supply Feedback Network
The RT0402CRD079R09L is used inside the feedback divider network of low-power DC-DC converters where compact 0402 placement directly next to the controller's FB pin minimises feedback-loop trace impedance. Its 9.09 Ohm value lets designers place it in parallel combinations to build non-standard divider ratios; the 25 ppm per degree Celsius TCR ensures the converter's output voltage stays within 0.5 percent across the industrial -40 to plus 85 degrees Celsius range. The 1/16 W (0.063 W) rating easily handles the few milliamps through the divider string. Combined with same-family YAGEO RT0402 feedback parts, the resistor gives designers a stable, low-noise option for TPS54302, MAX1771, or LM2675-based supplies.
Recommended
Test-and-Measurement Calibration Path
In benchtop multimeters, calibrators, and reference sources, RT0402CRD079R09L serves as part of a precision switched-resistor decade or as a calibration shunt where the 9.09 Ohm value establishes a low-impedance reference. The plus-or-minus 0.25 percent tolerance and 25 ppm per degree Celsius TCR allow the path to remain within calibration across environmental changes. The 0402 footprint supports dense PCB-side construction of multi-decade resistor standards, while the thin-film NiCr construction delivers the long-term stability needed for calibration-traceable instruments. In typical DMM designs with 6.5 to 8.5 digit resolution, the resistor sets a low-noise ground reference for the ADC input.
Recommended
Recommended Products Summary
Engineering reference data for RT0402CRD079R09L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | RT0402BRE079R09L | RT0402DRD079R09L | ERA-2AEB9R09X | PTN0402E7009R09L |
|---|---|---|---|---|---|
| Brand | YAGEO | YAGEO | YAGEO | Panasonic | Vishay |
| Package | 0402 (1005 Metric) | 0402 (1005 Metric) - same | 0402 (1005 Metric) - same | 0402 (1005 Metric) - same | 0402 (1005 Metric) - same |
| Resistance | 9.09 Ohm | 9.09 Ohm | 9.09 Ohm | 9.09 Ohm | 9.09 Ohm |
| Tolerance | plus-or-minus 0.25 percent | plus-or-minus 0.1 percent (tighter) | plus-or-minus 0.5 percent (looser) | plus-or-minus 0.1 percent (tighter) | plus-or-minus 0.25 percent (matches) |
| Power Rating | 0.063 W (1/16 W) | 0.063 W (1/16 W) | 0.063 W (1/16 W) | 0.063 W (1/16 W) | 0.063 W (1/16 W) |
| TCR | plus-or-minus 25 ppm/degree Celsius (CRD code) | plus-or-minus 50 ppm/degree Celsius (BRE code) | plus-or-minus 25 ppm/degree Celsius (DRD code) | plus-or-minus 25 ppm/degree Celsius (ERA-2A series) | plus-or-minus 25 ppm/degree Celsius (PTN series) |
| Resistor Technology | Thin Film | Thin Film | Thin Film | Thin Film | Thin Film |
| Operating Temperature | -55 degrees Celsius to +155 degrees Celsius (RT family) | -55 to +155 degrees Celsius | -55 to +155 degrees Celsius | -55 to +155 degrees Celsius | -55 to +155 degrees Celsius |
| RoHS Compliant | Yes (lead-free, halogen-free) | Yes | Yes | Yes | Yes |
Key Differentiators
- Thin-film NiCr element with 25 ppm/degree Celsius TCR (vs YAGEO RC0402 thick-film 9.09 Ohm equivalent)
- Plus-or-minus 0.25 percent tolerance vs plus-or-minus 1 percent thick-film (vs Generic 0402 thick-film 9.09 Ohm resistor)
- 0402 thin-film density with moisture-resistant construction (vs 0805 thin-film resistor (same family))
Design Notes
At full 0.063 W rating the RT0402CRD079R09L is rated for 70 degrees Celsius ambient. Per the YAGEO RT datasheet derating curve, allowable power falls to roughly 50 percent at 115 degrees Celsius and to zero at 155 degrees Celsius. Estimated: in an enclosed industrial enclosure with 20 K internal rise above ambient, the resistor should be sized for not more than about 0.04 W to maintain margin for the upper operating temperature ceiling. Ensure copper-pad heat-sinking is minimised to keep junction temperature uniform.
Per IPC-7351 and YAGEO's 0402 land-pattern recommendation, the recommended pad geometry for 0402 chip resistors is rectangular pads of approximately 0.55 mm width by 0.45 mm length, with 0.30 mm solder-mask openings and 0.45 mm horizontal centre-to-centre spacing. Using non-symmetric or oversized pads can cause tombstoning during reflow due to uneven solder wetting forces. Note that 'L' suffix in the MPN indicates 7-inch reel packaging; '7' suffix would indicate 13-inch reel per YAGEO packaging code.
Do not confuse the 'CRD' suffix with 'DRD' or 'BRE' - the part-number suffix encodes both TCR band and tolerance per YAGEO conventions: 'CRD' = plus-or-minus 25 ppm/degree Celsius, plus-or-minus 0.25 percent; 'BRE' = plus-or-minus 50 ppm/degree Celsius, plus-or-minus 0.1 percent; 'DRD' = plus-or-minus 25 ppm/degree Celsius, plus-or-minus 0.5 percent. Mixing suffixes is a common source of design drift. Also note that 9.09 Ohm (CRD variant) and 9.09 KOhm (DRD variant, K09L suffix) are easily mis-ordered since the only nominal difference is one letter position.
When the RT0402CRD079R09L is used in a critical sense path, route the traces as a Kelvin connection with separate sense pads at the resistor body and force pads at the current path. This avoids adding PCB trace resistance (typically 0.5-2 milliohms per millimetre) directly into the sense reading. Maintain a 4-wire (Kelvin) layout and keep the resistor a few millimetres away from heat-generating components such as MOSFETs or DC-DC magnetics, because thermal gradients are the dominant TCR contributor in surface-mount resistors.
Compliance Information
RoHS, lead-free, and halogen-free compliant per YAGEO RT product page. AEC-Q100 not applicable for passive chip resistors; the RT family is not AEC-Q100 qualified but is widely used in industrial consumer and test-and-measurement designs. REACH SVHC compliance confirmed per YAGEO environmental statement.
