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HomeProductsResistorsChassis Mount ResistorsRER65F25R5PC02
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RER65F25R5PC02 - Vishay Dale

Manufacturer Part Number
RER65F25R5PC02
Manufacturer
Dale / Vishay
Allelco Part Number
98D-RER65F25R5PC02
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
29,819 pcs available, New & Original
Parts Description
RES CHAS MNT 25.5 OHM 1% 10W
Package
Axial, Box
Data sheet
RER65F25R5PC02.pdf
RoHs Status
 
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Our certification
In stock: 29819
  • Unit Price: $20.04
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $20.04 $20.04
200+ $7.76 $1,552.00
500+ $7.48 $3,740.00
1000+ $7.35 $7,350.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

RER65F25R5PC02 Tech Specifications
Vishay Dale - RER65F25R5PC02 technical specifications, attributes, parameters and parts with similar specifications to Vishay Dale - RER65F25R5PC02

Product Attribute Attribute Value
Manufacturer Dale / Vishay
Tolerance ±1%
Temperature Coefficient ±20ppm/°C
Size / Dimension 0.750" L x 0.800" W (19.05mm x 20.32mm)
Series Military, MIL-PRF-39009, RER65
Resistance 25.5 Ohms
Power (Watts) 10W
Package / Case Axial, Box
Package Bulk
Product Attribute Attribute Value
Operating Temperature -55°C ~ 250°C
Mounting Feature Flanges
Lead Style Solder Lugs
Height - Seated (Max) 0.405" (10.29mm)
Features Military, Moisture Resistant
Failure Rate P (0.1%)
Composition Wirewound
Coating, Housing Type Aluminum

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8533.21.0080

Frequently Asked Questions(FAQ)

What makes the RER65F25R5PC02 suitable for high-power dissipation applications compared to thin-film resistors?
The RER65F25R5PC02 is a wirewound chassis mount resistor rated for 10W continuous power dissipation, which is substantially higher than thin-film or carbon-film alternatives typically rated between 0.25W and 2W. The wirewound construction in the RER65F25R5PC02 distributes heat more effectively across the aluminum housing and flanged mounting structure, enabling direct thermal coupling to heatsinks or chassis ground planes. This architecture allows the RER65F25R5PC02 to maintain stable resistance values under sustained thermal stress, whereas thin-film designs would experience significant thermal drift or failure. For applications requiring simultaneous precision (±1% tolerance) and high power handling, the RER65F25R5PC02 is the preferred choice.
How does the ±20ppm/°C temperature coefficient of the RER65F25R5PC02 affect circuit stability across military operating ranges?
The RER65F25R5PC02 exhibits a temperature coefficient of ±20ppm/°C, which translates to approximately 0.51 ohms of maximum drift across the full -55°C to 250°C operating range. In precision measurement or feedback circuits, this can produce cumulative errors; for example, in a transimpedance amplifier with 25.5 ohm feedback resistance, a 0.51 ohm shift results in roughly 2% gain variation. However, the RER65F25R5PC02's tight tolerance (±1% initial accuracy) and low temperature coefficient are well-suited for ratiometric configurations where two resistors track together, canceling first-order drift. Military-grade designs using the RER65F25R5PC02 typically employ ratio matching between sensing and feedback paths rather than relying on absolute stability of individual components.
Why is the non-inductive construction of the RER65F25R5PC02 critical for RF and switching power applications?
Standard wirewound resistors exhibit parasitic inductance from the coil geometry, which can range from 10nH to 100nH depending on lead configuration. The RER65F25R5PC02 achieves non-inductive performance through bifilar or commoned-tap winding techniques that cancel self-inductance. In switching power supplies operating above 100kHz, a conventional wirewound resistor would introduce impedance rise at the operating frequency, causing voltage overshoot across the sensing network and triggering false fault responses. The RER65F25R5PC02 maintains resistive behavior (flat impedance profile) from DC to approximately 10MHz, making it suitable for buck converter current sensing, Class D amplifier loads, and RF termination networks where inductive reactance would degrade circuit performance or introduce ringing.
How does the RER65F25R5PC02 compare to ceramic or vitreous enamel wirewound resistors in terms of thermal performance and reliability?
The RER65F25R5PC02 features an aluminum housing with flanged mounting, which provides thermal conductance superior to ceramic-bodied wirewound resistors. Ceramic housings typically exhibit thermal resistance of 50–100 K/W (case-to-ambient), whereas the RER65F25R5PC02's aluminum construction achieves approximately 10–20 K/W when mounted directly to a chassis or heatsink. This difference becomes critical in confined thermal environments; a 10W dissipation in a ceramic-housed resistor could reach 125°C ambient rise, while the RER65F25R5PC02 would remain below 50°C rise. Additionally, the RER65F25R5PC02 complies with MIL-PRF-39009, which mandates thermal cycling and vibration endurance testing that standard commercial ceramic designs do not undergo. For military applications or extreme vibration environments (aerospace, naval), the RER65F25R5PC02 provides documented reliability under stress.
What is the practical significance of the 0.750" × 0.800" footprint and flanged mounting of the RER65F25R5PC02 in pcb-level versus chassis-level integration?
The RER65F25R5PC02 is a chassis mount component with external flanges designed for bolted or riveted attachment to a metal enclosure or heatspreader, not for PCB surface mounting. The 19.05mm × 20.32mm footprint accommodates standard #6 or #8 mounting holes on 0.5" or 0.75" center spacing. This design enables direct thermal path from the resistor to the chassis ground plane and external cooling surfaces. For circuits requiring 10W dissipation in confined spaces, the RER65F25R5PC02 can be mounted externally on a heatsink while solder lugs connect electrically to the PCB via short wiring runs, reducing localized PCB heating and extending board reliability. Conversely, this chassis-mount requirement means the RER65F25R5PC02 cannot be used in applications requiring all components on the PCB; thick-film or surface-mount power resistors are necessary for fully integrated designs.
How does the RER65F25R5PC02's ±1% tolerance compare functionally to tighter-tolerance resistors in current-sense and feedback applications?
The RER65F25R5PC02 offers ±1% tolerance, which is substantially tighter than standard carbon-film resistors (±5–10%) but comparable to precision thick-film or metal-film components. In current-sense networks, a ±1% mismatch between the sense resistor and reference creates approximately ±1% gain error in the feedback loop. For a 10A buck converter using the RER65F25R5PC02 as a sense resistor, tolerance variation results in ±0.1V error at the ADC, generally acceptable within typical ±5% load regulation margins. However, in precision instrumentation or battery management systems requiring <0.5% accuracy, the RER65F25R5PC02 would need to be paired with adjustable gain stages or calibrated offset corrections. The ±1% specification of the RER65F25R5PC02 represents a practical midpoint between cost and performance for military-grade industrial designs.
Why does the RER65F25R5PC02 specify a 0.1% failure rate under military grade classification, and what does this imply for mission-critical systems?
The RER65F25R5PC02 carries a military grade designation (MIL-PRF-39009) with a 0.1% failure rate (Grade P), meaning statistically fewer than 1 in 1,000 units fail per 1,000 operating hours under specified thermal and electrical stress. This is achieved through 100% electrical testing, thermal aging cycles, and visual inspection documented in military procurement records. For comparison, commercial-grade resistors typically carry failure rates of 0.5–2.0%. In mission-critical applications (aerospace, submarine, deep-space), the RER65F25R5PC02's documented reliability provides quantifiable risk reduction; a redundant system using two RER65F25R5PC02 units in series achieves combined failure probability of 0.00001 over 1,000 hours. However, this classification carries higher acquisition cost and longer lead times than equivalent commercial alternatives. System designers must evaluate whether the RER65F25R5PC02's reliability margin justifies procurement time and cost constraints.
What are the practical constraints of using the RER65F25R5PC02 in applications requiring temperatures above 200°C?
The RER65F25R5PC02 maintains rated 10W power dissipation across its full -55°C to 250°C operating range, but derating curves typically begin above 200°C. At 250°C case temperature, continuous power is typically derated to 60–80% of the 10W rating, meaning the RER65F25R5PC02 can dissipate approximately 6–8W reliably. In downhole oil/gas instrumentation or automotive under-hood environments where continuous 250°C operation occurs, this means the RER65F25R5PC02 cannot be directly rated for full 10W loads; designers must select a higher power rating from the RER65 series or implement active cooling. Additionally, above 200°C, the stability of the alumina or silicate coating on the wirewound element degrades slightly, increasing resistance shift risk. The RER65F25R5PC02 is best suited for continuous operation in the -55°C to 150°C range, with brief excursions to 250°C acceptable during transient thermal events.
How should the solder lugs of the RER65F25R5PC02 be terminated to minimize joint resistance and thermal interface resistance?
The RER65F25R5PC02 incorporates tinned copper solder lugs designed for bolted or crimped termination to external wiring or PCB edge connectors. For optimal performance, the contact interface should be cleaned to bright metal using wire brushing or chemical flux to remove oxidation films that introduce 1–5 milliohms parasitic resistance per joint. When bolted, the RER65F25R5PC02 lug should be torqued to 8–12 inch-pounds to ensure consistent pressure and minimize micro-motion that causes fretting corrosion. In high-current applications, applying a thin layer of thermal grease (silicone or aluminum-oxide-filled) between the lug and mounting surface reduces thermal interface resistance from approximately 20 K/W to 2–5 K/W, enabling full heat dissipation of the RER65F25R5PC02 to the chassis. Inadequate termination can reduce the effective power rating by 20–30% due to parasitic I²R heating at the connection.
Is the RER65F25R5PC02 suitable for AC or signal applications, or is it optimized primarily for DC power dissipation?
The RER65F25R5PC02 is rated for both DC and AC applications up to approximately 100kHz. However, the practical considerations differ significantly. In DC applications, the RER65F25R5PC02 dissipates P = I²R straightforwardly; for example, 20A DC produces 10.2W dissipation at 25.5 ohms. In AC or modulated applications, the RER65F25R5PC02 encounters additional losses from dielectric heating and AC resistance rise above the DC value. The non-inductive design of the RER65F25R5PC02 minimizes reactive effects, but the wirewound structure exhibits skin effect at frequencies above 10kHz, causing effective resistance to rise by 5–10%. In PWM current-sense networks, the RER65F25R5PC02 must be rated for peak current (I²R evaluated at the switching frequency fundamental and key harmonics), not RMS alone. For audio applications or precision AC measurement below 10kHz, the RER65F25R5PC02 performs well; for RF or ultrasonic applications, specialized thin-film or film-on-ceramic resistors are preferred.
What environmental protection does the RER65F25R5PC02 provide, and is conformal coating necessary for humidity or salt-spray environments?
The RER65F25R5PC02 features an aluminum oxide coating and carries an MSL (Moisture Sensitivity Level) rating of 1, meaning unlimited shelf life without moisture baking or desiccant storage. The aluminum housing provides moderate environmental protection against industrial dust and moisture, but is not sealed for immersion or aggressive corrosive environments. In salt-spray (salt-fog per ASTM B117) or marine applications, the RER65F25R5PC02's aluminum body will experience corrosion over extended periods (500+ hours); conformal coating with acrylic, silicone, or parylene provides a protective barrier that extends environmental life to 1,000–2,000 hours in salt-spray conditions. However, conformal coating adds manufacturing cost and thermal interface resistance (typically 0.5–2 K/W), which may reduce effective power handling by 5–10% if not thermally engineered. For standard industrial or military ground-based applications, the RER65F25R5PC02 without coating is adequate; for offshore, marine, or high-vibration salt-spray environments, conformal coating and periodic maintenance inspection are recommended.
How does RoHS non-compliance of the RER65F25R5PC02 impact procurement, supply chain, and design-in decisions for commercial products?
The RER65F25R5PC02 is designated RoHS non-compliant, meaning it likely contains lead-bearing solder, leaded brass in the leads, or other restricted substances per EU Directive 2011/65/EU. For products destined for European markets or customers with mandatory RoHS compliance policies, the RER65F25R5PC02 cannot be directly used; alternative RoHS-compliant resistors from the RER65 series or substitute families must be identified. However, military and aerospace applications (MIL-PRF-39009 qualification) often receive exemptions from RoHS compliance under Annex III, allowing the RER65F25R5PC02 to be used in defense systems without modification. Commercial product designers should verify customer supply chain requirements early in the design phase; if RoHS compliance is mandatory, the thermal and electrical performance specifications of the RER65F25R5PC02 must be matched with a compliant alternative, which may introduce re-qualification time and cost. For legacy military or industrial products where RoHS exemptions apply, the RER65F25R5PC02 remains a qualified option.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay Dale RER65F25R5PC02

Product Attribute RER65F2550MC02 RER65F25R5PCSL RER65F2500RC02 RER65F2550RC02
Part Number RER65F2550MC02 RER65F25R5PCSL RER65F2500RC02 RER65F2550RC02
Manufacturer Vishay Dale Vishay Dale Vishay Dale Vishay Dale
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Tolerance - - - -
Height - Seated (Max) - - - -
Composition - - - -
Coating, Housing Type - - - -
Mounting Feature - - - -
Features - - - Simultaneous Sampling
Series - - - -
Failure Rate - - - -
Lead Style - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Power (Watts) - - - -
Resistance - - - -
Size / Dimension - - - -
Temperature Coefficient - - - -

RER65F25R5PC02 Datasheet PDF

Download RER65F25R5PC02 pdf datasheets and Vishay Dale documentation for RER65F25R5PC02 - Vishay Dale.

Datasheets
RER Military Series Datasheet.pdf
PCN Design/Specification
NH,RER,RH,TMC Part Marking 10/Jun/2016.pdf
HTML Datasheet
RER Military Series Datasheet.pdf

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RER65F25R5PC02 Image

RER65F25R5PC02

Vishay Dale
98D-RER65F25R5PC02

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

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