Product Overview
Vishay Dale RN55E2551FJ Metal Film Precision Resistor - 2.55kΩ 1% ±25ppm/°C MIL-R-10509 Qualified
Condition
Unused NOS. Axial-lead metal film body with RN55 E markings visible; leads straight with no visible damage or oxidation. Sourced from legacy electronics supply chain recovery. Evaluation: Visual inspection only. Function testing not performed.
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Product Overview
Vishay Dale RN55E2551FJ is a military-qualified precision metal film resistor built to MIL-R-10509, Type RN55. Resistance value is 2.55kΩ (2550Ω), decoded from the military code 2551. Tolerance is ±1.0% (suffix F). Characteristic E designates a temperature coefficient of ±25 ppm/°C - the tightest standard TCR in the RN55 family. Rated 1/8W (0.125W) at 70°C. Axial-leaded through-hole construction with tin-lead (Sn/Pb) plated copper leads, standard for MIL-R-10509 components.
Key Features
- Resistance: 2.55kΩ (2550Ω) - military code 2551
- Tolerance: ±1.0% (F suffix)
- Temperature coefficient: ±25 ppm/°C (Characteristic E)
- Power rating: 0.125W (1/8W) at 70°C
- Maximum working voltage: 200V
- Package: axial-leaded through-hole, fits standard PCB through-hole pads
- Lead finish: tin-lead (Sn/Pb) electroplated copper - standard MIL-R-10509 spec
- Military specification: MIL-R-10509 Qualified, Type RN55
- Tighter stability than RN55D (±100 ppm/°C) and RN55C (±50 ppm/°C) variants
Applications
- Aerospace and defense MRO technician replaces a drifted resistor on a legacy military PCB - lead-forms the RN55E2551FJ to match pad pitch, solders with Sn63/Pb37, then performs post-repair resistance and circuit calibration check to maintain system certification
- Avionics depot uses MIL-R-10509 qualified parts to satisfy QPL requirements during depot-level repair of legacy radar or communications boards where commercial substitutes fail qualification review
- Test equipment restoration hobbyist sourcing the exact 2.55kΩ Type RN55 Characteristic E part called out in a vintage instrument service manual to restore a voltage divider or reference network to original specification before a multi-day thermal stability burn-in
- Metrology enthusiast building or repairing a precision analog reference circuit who needs ±25 ppm/°C thermal stability to hold calibration across temperature cycles
- Maker or experimenter integrating a stable, low-drift resistor into a precision analog signal chain, DIY Wheatstone bridge, or temperature-compensated sensor circuit where commercial thick-film parts introduce unacceptable drift
Frequently Asked Questions
Is this part RoHS compliant?
No. MIL-R-10509 components use tin-lead (Sn/Pb) electroplated copper leads as standard. This part is not suitable for lead-free or RoHS-restricted assemblies.
What is the difference between the RN55E and RN55D or RN55C?
The suffix letter designates the temperature coefficient characteristic. RN55E (this part) is ±25 ppm/°C. RN55C is ±50 ppm/°C. RN55D is ±100 ppm/°C. For precision reference and calibration circuits, Characteristic E is the tightest standard option in the RN55 family.
What is the resistance value - the seller's notes say 255 Ohm but the title says 2.55kΩ. Which is correct?
2.55kΩ (2550Ω) is correct. The military code 2551 decodes as 255 followed by one zero, giving 2550Ω. The BC import note referencing 255Ω is a data entry error. The part markings visible on the unit and the full part number RN55E2551FJ confirm 2.55kΩ.
Does this ship with leads pre-formed?
Leads are straight as supplied, consistent with standard NOS component packaging. Lead-forming to match PCB pad pitch is a standard step during installation.
Is this a surface-mount (SMD) part?
No. This is an axial-leaded through-hole component. It is not compatible with SMT pick-and-place assembly.
The RN55E series was built when ±25 ppm/°C was a serious engineering commitment, not a datasheet footnote. If your circuit needs to hold its value when the temperature changes, this is the part that was designed to do exactly that.
