RK73B1ETTP271J KOA Speer Resistor (Resistor Chip) In Stock
The RK73B1ETTP271J is a 270-ohm, 5% tolerance thick-film chip resistor from KOA Speer, rated at 1/16 W (62.5 mW) in a compact 0402 SMD package. Pb-free and REACH-compliant with a 0.35 mm height, it is well suited for signal conditioning, pull-up, and LED current-limiting networks in miniaturized electronics.
- Manufacturer
- KOA Speer
- Package
- Resistor Chip
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- RK73B1ETTP271J Datasheet PDF
- Category
- Resistor
- Temp Range
- -55.0°C to 155.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 270-ohm resistance with 5% tolerance for cost-effective general-purpose use
- 1/16 W (62.5 mW) power rating in a 0402 (1.0 x 0.5 mm) footprint
- 0.35 mm ultra-low height for slim-profile and stacked-board assemblies
- RoHS- and REACH-compliant Pb-free terminations (JESD-609 e3)
- Thick-film construction delivering stable resistance from -55°C to +155°C
Applications
The RK73B1ETTP271J is used in pull-up and pull-down networks on I2C and SPI bus lines, where 270-ohm values help match typical bus termination requirements in 3.3V systems. It serves as a current-limiting resistor for LEDs driven at up to approximately 12 mA from a 3.3V rail, a common requirement in wearable and IoT product indicator circuits. The compact 0402 package and 0.35 mm height also make it a standard choice for high-density mixed-signal PCBs in smartphones, tablets, and industrial sensor modules.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 13 |
| Construction | Rectangular |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Package Height | 0.35mm |
| Package Length | 1mm |
| Package Shape | RECTANGULAR PACKAGE |
| Package Style | SMT |
| Package Width | 0.5mm |
| Packing Method | TR, Punched Paper, 7 Inch |
| Rated Power Dissipation (P) | 0.1W |
| Rated Temperature | 70°C |
| Reference Standard | AEC-Q200, IEC60115-8 |
| Resistance | 270Ω |
| Resistor Type | FIXED RESISTOR |
| Size Code | 0402 |
| Surface Mount | YES |
| Technology | METAL GLAZE/THICK FILM |
| Temperature Coefficient | 200ppm/°C |
| Terminal Finish | Matte Tin (Sn) - with Nickel (Ni) barrier |
| Terminal Shape | WRAPAROUND |
| Tolerance | 5% |
| Working Voltage | 75V |
| Package | Resistor Chip |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.21.00.30 |
| Country of Origin | Japan, Mainland China, Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At 270 ohms and 1/16 W rating, how much current can the RK73B1ETTP271J pass continuously without exceeding its power limit?
Using P = I² × R, the maximum continuous current for the RK73B1ETTP271J at full 1/16 W (62.5 mW) rating is approximately 15.2 mA. In practice, designers derate to 50–70% of rated power to improve long-term reliability, which limits operating current to about 8 to 11 mA. At 3.3V supply with a 270-ohm series resistor, a forward-biased LED circuit would typically draw around 8 to 12 mA, well within the safe operating range.
How does a 5% tolerance on the RK73B1ETTP271J affect precision analog circuit performance?
A 5% tolerance means the actual resistance of any given RK73B1ETTP271J unit can range from 256.5 to 283.5 ohms. For LED current-limiting, pull-up/pull-down, and bypass applications this variation is inconsequential. However, for precision analog circuits such as op-amp gain stages, voltage dividers for ADC references, or filter cut-off frequency networks requiring better than ±2% accuracy, a 1% tolerance thick-film alternative in the same 0402 package should be selected to minimize gain or frequency error.
What board-assembly considerations apply to placing the RK73B1ETTP271J in a high-density 0402 layout?
The 0402 package (1.0 mm x 0.5 mm, 0.35 mm tall) requires pick-and-place equipment with a minimum nozzle opening of 0.4 mm and good vacuum hold. IPC-7351 land patterns recommend pad sizes of approximately 0.56 mm x 0.62 mm with a 0.5 mm center-to-center gap. Stencil apertures for SAC305 solder paste should be 0.12 to 0.15 mm thick to prevent bridging. Component spacing to adjacent 0402 parts should be at least 0.2 mm to allow adequate solder joint inspection and rework access.
Is the RK73B1ETTP271J suitable for automotive electronics requiring wide temperature operation?
Yes. KOA Speer's RK73B series thick-film resistors are rated from -55°C to +155°C, covering the AEC-Q200 automotive passive component temperature ranges for both Grade 1 (-40°C to +125°C) and Grade 0 (-40°C to +150°C) applications. The REACH-compliant and JESD-609 e3 Pb-free terminations also meet the material requirements for automotive OEM supply chains in regions governed by EU ELV and RoHS directives.
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