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HomeProductsResistorsChassis Mount ResistorsRER65F4991PCSL
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RER65F4991PCSL - Vishay Dale

Manufacturer Part Number
RER65F4991PCSL
Manufacturer
Dale / Vishay
Allelco Part Number
98D-RER65F4991PCSL
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
28,557 pcs available, New & Original
Parts Description
RES CHAS MNT 4.99K OHM 1% 10W
Package
Axial, Box
Data sheet
RER65F4991PCSL.pdf

PCN Design/Specification

Cylindrical Battery Holders.pdf
RoHs Status
 
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Our certification
In stock: 28557
  • Unit Price: $24.81
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $24.81 $24.81
200+ $9.60 $1,920.00
500+ $9.26 $4,630.00
1000+ $9.10 $9,100.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

RER65F4991PCSL Tech Specifications
Vishay Dale - RER65F4991PCSL technical specifications, attributes, parameters and parts with similar specifications to Vishay Dale - RER65F4991PCSL

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 4.99 kOhms
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 RER65F4991PCSL suitable for high-temperature applications where standard resistors fail?
The RER65F4991PCSL is a wirewound chassis mount resistor rated for continuous operation from -55°C to 250°C, enabling deployment in aerospace, automotive, and industrial environments where ambient temperatures exceed the limits of film or carbon-composition alternatives. The ±20ppm/°C temperature coefficient ensures the 4.99 kOhms resistance value remains stable across this extended range, critical for precision analog circuits, bias networks, and current-sensing applications in high-temperature avionics or downhole instrumentation where resistance drift directly affects system accuracy.
How does the 10W power rating of the RER65F4991PCSL compare to thin-film and carbon-film resistors in automotive underhood designs?
The RER65F4991PCSL delivers 10W continuous dissipation, approximately 20–50 times the power handling of equivalent thin-film or 1/4W carbon-film resistors. In automotive applications, this enables the 4.99 kOhms resistor to serve as a single load resistor or current-limiting element in relay drives, ignition circuits, or battery disconnect logic without parallel combinations, reducing board space and failure modes. Wirewound construction of the RER65F4991PCSL also provides superior thermal conductivity through the aluminum housing flanges, allowing heat to transfer efficiently to a chassis or heatsink.
Why is the ±1% tolerance of the RER65F4991PCSL specified as a military-grade component rather than standard ±5%?
The RER65F4991PCSL meets MIL-PRF-39009 military specifications, which mandate ±1% tolerance to support precision applications such as analog filter networks, instrumentation amplifier gain-setting resistors, and reference dividers where 4–5% total error cannot be tolerated. Military-grade tolerance also reflects tighter manufacturing controls and burn-in testing, reducing the likelihood of parametric drift or early-life failures. In space, defense, and aerospace systems, the cost premium of the RER65F4991PCSL is justified by the elimination of hand-tuning or post-calibration at higher assembly levels.
Can the RER65F4991PCSL be soldered directly to PCB traces, or does the flange-mount feature require special mechanical installation?
The RER65F4991PCSL incorporates solder lugs and flanges designed for hybrid-circuit or thick-film module assembly rather than standard PCB through-hole soldering. The 0.750" length and 0.800" width, combined with flanged mounting ears, position this resistor for bolt-down attachment to a metal chassis or heatspreader plate. Direct PCB mounting is not recommended; the RER65F4991PCSL requires custom PCB footprints with oversized solder pads and mechanical anchoring to handle the thermal cycling stresses and vibration loads typical of military and aerospace environments.
What is the relationship between the RER65F4991PCSL's P-class failure rate (0.1%) and system-level reliability predictions in MIL-HDBK-217 calculations?
The RER65F4991PCSL carries a P-class failure rate of 0.1%, translating to approximately 1,000 failures per million component hours under specified conditions. In MIL-HDBK-217 reliability modeling, this baseline is adjusted by application factors such as operating temperature (the RER65F4991PCSL's 250°C rated maximum significantly reduces derating), electrical stress ratio (power dissipation relative to 10W rating), and environmental category (sealed versus exposed). For a system requiring 99.9% availability over a 10-year mission, the low inherent failure rate of the RER65F4991PCSL allows it to serve as a non-critical element without redundancy.
How does the aluminum housing of the RER65F4991PCSL affect EMI susceptibility and shielding effectiveness in RF or mixed-signal circuits?
The aluminum housing of the RER65F4991PCSL provides moderate electrical shielding and dissipates heat effectively but does not act as a Faraday cage. In high-frequency or RF environments, the RER65F4991PCSL should be positioned away from sensitive analog inputs or clock lines. If EMI coupling is a concern, the RER65F4991PCSL can be mounted inside a shielded enclosure or paired with bypass capacitors and ferrite beads on input/output traces. The thermal mass of the aluminum housing is the primary benefit—enabling the 4.99 kOhms resistor to dissipate 10W with surface temperatures below 200°C in natural convection, reducing thermal runaway risk in confined spaces.
What design trade-offs exist between selecting the RER65F4991PCSL versus a ceramic-bodied wirewound resistor for high-frequency pulse applications?
Ceramic-bodied wirewound resistors typically exhibit lower parasitic inductance and higher frequency response (suitable for applications above 1 MHz), whereas the RER65F4991PCSL with its aluminum housing introduces inductance (~10–50 nH depending on geometry) that can cause transient overshoot and ringing in pulse circuits. However, the RER65F4991PCSL's superior thermal conductivity and lower cost per watt make it preferable for high-power DC or low-frequency (< 100 kHz) applications such as PWM current sensing, brake resistors, or load-bank circuits. For mixed-signal designs, the RER65F4991PCSL should be reserved for post-regulator or load-line applications where inductance effects are negligible.
Is the RER65F4991PCSL compliant with RoHS or aerospace qualification standards, and what substitution pathways exist if RoHS compliance is mandated?
The RER65F4991PCSL is marked as RoHS non-compliant, indicating the presence of lead in solder or other restricted substances. In aerospace and defense platforms (MIL-HDBK-454, MIL-PRF-55110), this non-compliance is often accepted or waived due to the critical-nature of military-qualified components. For commercial or automotive programs requiring RoHS compliance, qualified substitutes such as RoHS-compliant wirewound resistors from Vishay Dale (e.g., RER67 or RWS series) must be evaluated for form-factor compatibility and thermal performance. The RER65F4991PCSL's 4.99 kOhms value and 10W rating are relatively common, reducing lead-time risk for conversion.
What moisture and corrosion protection mechanisms are built into the RER65F4991PCSL, and how does MSL Level 1 affect storage and handling?
The RER65F4991PCSL carries Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life and no moisture-bake requirement prior to soldering. The moisture-resistant coating and sealed aluminum housing of the RER65F4991PCSL provide substantial protection against salt spray, humidity, and thermal cycling corrosion. This design is well-suited for marine, coastal, or outdoor applications where uncoated components would oxidize rapidly. The RER65F4991PCSL can be stored in standard dry-box conditions without desiccant or vacuum sealing, reducing procurement logistics compared to MSL 2–3 components.
How should thermal management and heatsinking be designed when the RER65F4991PCSL dissipates sustained 10W power in a confined enclosure?
At full 10W dissipation, the RER65F4991PCSL will self-heat significantly; enclosure surface temperature can reach 150–200°C depending on ambient conditions and heatsinking. Optimal thermal design involves mounting the RER65F4991PCSL to an aluminum chassis plate or heatspreader with thermal compound (e.g., aluminum oxide paste) filling the interface between the flanges and mounting surface. A 0.1–0.2 K/W thermal coupling is achievable, limiting the resistor element temperature to ~50°C above the heatsink. Forced-air cooling or liquid-cooled cold plates may be necessary for sustained operation above 200°C ambient, where the RER65F4991PCSL's maximum rating becomes a constraint and derating curves should be consulted.
What is the expected lifespan of the RER65F4991PCSL under combined thermal cycling and vibration loading typical of aerospace platforms?
Military-qualified wirewound resistors like the RER65F4991PCSL are designed to withstand 1,000+ thermal cycles (-55°C to 250°C) without significant resistance drift or mechanical failure. Under combined vibration (20–500 Hz, 10G typical for airframe structures) and thermal cycling, the solder-lug connections and internal wirewound element remain mechanically stable due to the aluminum housing's rigidity. Published life data suggests the RER65F4991PCSL can deliver > 20,000 flight hours in military applications when operated within electrical and thermal ratings. Accelerated life testing (e.g., HTOL—high-temperature operating life at 85°C/85% relative humidity) extrapolates failure modes, but field experience with the RER65 series confirms low degradation rates.
How does the wirewound construction of the RER65F4991PCSL affect phase response and impedance linearity in network analysis or filter applications?
Wirewound resistors including the RER65F4991PCSL exhibit frequency-dependent impedance behavior due to parasitic inductance and capacitance, with impedance rising above the 4.99 kOhms nominal value at frequencies > 1 MHz. Phase shift across the resistor element can introduce measurement errors in AC bridge circuits or precision impedance networks. The RER65F4991PCSL is suitable for audio-frequency (< 20 kHz) and DC applications but should be avoided in IF (intermediate frequency) or RF filter sections without characterization. For applications requiring flat impedance across wide frequency bands, thin-film or metal-film resistors are preferable despite lower power rating.
What ESD (electrostatic discharge) precautions or component handling protocols apply specifically to the RER65F4991PCSL during assembly and field maintenance?
The RER65F4991PCSL is a passive wirewound component with no semiconductor junctions or active elements, making it inherently immune to ESD damage. Standard component handling (wrist straps, static-safe workbenches) is not required beyond general industry practice. However, during rework or replacement in military systems, the solder-lug connections should be desoldered carefully to avoid mechanical damage to the internal wirewound element; thermal shock from rapid heating can cause internal fractures. The RER65F4991PCSL should be stored in conventional component trays or bags without conductive shielding, and no special ESD packaging is necessary.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay Dale RER65F4991PCSL

Product Attribute RER65F4991RCSL RER65F4991MCSL RER65F4991PC02 RER65F4990RCSL
Part Number RER65F4991RCSL RER65F4991MCSL RER65F4991PC02 RER65F4990RCSL
Manufacturer Vishay Dale Vishay Dale Vishay Dale Vishay Dale
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Feature - - - -
Resistance - - - -
Composition - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Lead Style - - - -
Power (Watts) - - - -
Height - Seated (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Coating, Housing Type - - - -
Temperature Coefficient - - - -
Failure Rate - - - -
Size / Dimension - - - -
Features - - - Simultaneous Sampling
Tolerance - - - -
Series - - - -

RER65F4991PCSL Datasheet PDF

Download RER65F4991PCSL pdf datasheets and Vishay Dale documentation for RER65F4991PCSL - Vishay Dale.

Datasheets
Cylindrical Battery Holders.pdf
PCN Design/Specification
Cylindrical Battery Holders.pdf
HTML Datasheet
RER Military Series Datasheet.pdf

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RER65F4991PCSL Image

RER65F4991PCSL

Vishay Dale
98D-RER65F4991PCSL

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

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