RK73B3ATTE331J KOA Speer Resistor (Resistor Chip) In Stock
KOA Speer RK73B3ATTE331J is a 330 ohm, 5% tolerance thick film SMD resistor rated at 1W in a 2512 (6.3mm x 3.2mm) package for high-power surface mount applications. Its rectangular chip construction handles substantial power dissipation on compact PCBs. Available from authorized distributors with worldwide shipping.
- Manufacturer
- KOA Speer
- Package
- Resistor Chip
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- RK73B3ATTE331J 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
- 1W power rating in 2512 (6.3 mm x 3.2 mm) SMD package for high-power thick film resistor applications
- 330 ohm resistance with 5% tolerance in a compact chip format for current limiting and power management circuits
- RoHS compliant and REACH conformant with e3 JESD-609 code, compatible with lead-free reflow soldering
Applications
The RK73B3ATTE331J is designed for power supply output filters, LED current limiting, motor drive snubber networks, and load-balancing circuits where a 330 ohm resistor must dissipate up to 1W continuously in a surface mount package. The 2512 large-body chip provides superior thermal dissipation compared to smaller 1206 or 0805 packages, reducing the need for external heat management in moderate-power designs. It is also used in inrush current limiting and discharge resistor roles in industrial power conversion equipment.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Compliant |
| YTEOL | 10 |
| Construction | Rectangular |
| JESD-609 Code | e3 |
| Mounting Feature | SURFACE MOUNT |
| Package Height | 0.6mm |
| Package Length | 6.3mm |
| Package Shape | RECTANGULAR PACKAGE |
| Package Style | SMT |
| Package Width | 3.1mm |
| Packing Method | TR, EMBOSSED PLASTIC, 7 INCH |
| Rated Power Dissipation (P) | 1W |
| Rated Temperature | 70°C |
| Reference Standard | AEC-Q200 |
| Resistance | 330Ω |
| Resistor Type | FIXED RESISTOR |
| Size Code | 2512 |
| Surface Mount | YES |
| Technology | METAL GLAZE/THICK FILM |
| Temperature Coefficient | 200ppm/°C |
| Terminal Finish | MATTE TIN OVER NICKEL |
| Terminal Shape | WRAPAROUND |
| Tolerance | 5% |
| Working Voltage | 200V |
| 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
How much current can flow through RK73B3ATTE331J at its rated 1W power dissipation?
At 1W continuous power dissipation and 330 ohms resistance, the maximum current is approximately 55 mA (I = sqrt(P/R) = sqrt(1/330) ≈ 0.055 A). This makes RK73B3ATTE331J well suited for LED string current limiting at 55 mA or less, or as a bleeder resistor in a 3.3 V to 5 V power rail where dissipation needs to be managed without exceeding the 1W thermal limit.
What physical dimensions does the 2512 package of RK73B3ATTE331J provide, and why does that matter for thermal performance?
The 2512 package body measures 6.3 mm long by 3.2 mm wide with a 0.6 mm height. Its large solder pad area provides a direct thermal path to the PCB copper, enabling full 1W dissipation without a heatsink on a standard FR4 board with adequate copper pour. Smaller packages like 1206 (3.2 mm x 1.6 mm) can typically only sustain 0.25 W under similar conditions, making 2512 the preferred format for high-power resistor applications.
When is a 5% tolerance acceptable for the RK73B3ATTE331J, and when should a 1% version be used instead?
A 5% tolerance is acceptable for RK73B3ATTE331J in applications such as LED current limiting, pullup/pulldown networks, and general power dissipation roles where the exact resistance value has minimal impact on circuit performance. However, for precision voltage dividers, analog signal conditioning, or differential amplifier gain-setting circuits where a 330 ohm resistor error of up to ±16.5 ohms would introduce unacceptable offset, a 1% tolerance thick film resistor in the equivalent power rating should be chosen instead.
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