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Home Products Resistors Through Hole Resistors~~RLR20C5R49FMRE6~~

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RLR20C5R49FMRE6 - Vishay Dale

Name: Vishay Dale RLR20C5R49FMRE6
Brand: Vishay Dale
SKU: RLR20C5R49FMRE6
Price: 2.388 USD
Availability: InStock
Rating: 5 (9 reviews)

Manufacturer Part Number: RLR20C5R49FMRE6

Manufacturer: Dale / Vishay

Allelco Part Number: 98D-RLR20C5R49FMRE6

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 41,857 pcs available, New & Original

Parts Description: RES 5.49 OHM 1% 1/2W AXIAL

Package: Axial

Data sheet: RLR20C5R49FMRE6.pdf

Datasheets
ERL (Military RLR).pdf

RoHs Status

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Quantity	Unit Price	Ext. Price
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Specifications

RLR20C5R49FMRE6 Tech Specifications
Vishay Dale - RLR20C5R49FMRE6 technical specifications, attributes, parameters and parts with similar specifications to Vishay Dale - RLR20C5R49FMRE6

Product Attribute	Attribute Value
Manufacturer	Dale / Vishay
Tolerance	±1%
Temperature Coefficient	±100ppm/°C
Supplier Device Package	Axial
Size / Dimension	0.138" Dia x 0.375" L (3.51mm x 9.53mm)
Series	Military, MIL-PRF-39017/02, RLR20
Resistance	5.49 Ohms
Power (Watts)	0.5W, 1/2W
Package / Case	Axial

Product Attribute	Attribute Value
Package	Tape & Reel (TR)
Operating Temperature	-65°C ~ 150°C
Number of Terminations	2
Height - Seated (Max)	-
Features	Military, Moisture Resistant, Weldable
Failure Rate	M (1%)
Composition	Metal Film
Base Product Number	RLR20

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	Not Applicable
ECCN	EAR99
HTSUS	8533.21.0090

Frequently Asked Questions(FAQ)

What makes the RLR20C5R49FMRE6 suitable for military and aerospace applications compared to commercial resistors?: The RLR20C5R49FMRE6 is manufactured to MIL-PRF-39017/02 specifications, which mandates rigorous qualification testing, tighter process control, and documented traceability—requirements absent in commercial resistors. The metal film construction combined with moisture-resistant coating ensures stable performance across the full -65°C to 150°C operating range typical in military avionics and defense electronics. The 1% tolerance and ±100ppm/°C temperature coefficient of the RLR20C5R49FMRE6 provide predictable performance in applications where component aging or environmental stress could degrade circuit function. Additionally, the weldable terminations enable direct soldering to PCBs without intermediate connectors, reducing failure points in high-reliability systems.

How does the 5.49 Ohm resistance value of the RLR20C5R49FMRE6 function in current-sensing and thermal management circuits?: The 5.49 Ohm value creates meaningful voltage drops across modest currents, making the RLR20C5R49FMRE6 practical for precision current-sensing applications where a 0.5W power budget allows safe dissipation. At 1 ampere, the RLR20C5R49FMRE6 produces approximately 5.49 volts across its terminals—sufficient for accurate measurement with standard instrumentation amplifiers or ADC front ends. In thermal management contexts, designers often parallel multiple RLR20C5R49FMRE6 units to distribute heat load; alternatively, the resistor functions as a load element in active current-limiting or soft-start topologies where controlled ramp-up prevents inrush currents that could damage switching semiconductor junctions.

What is the practical difference between the RLR20C5R49FMRE6 and a standard commercial film resistor regarding long-term stability in harsh environments?: The RLR20C5R49FMRE6 incorporates military-grade moisture resistance and metal film construction that minimizes drift over extended storage and operational life. Commercial film resistors often experience measurable resistance change (typically 0.5–2%) after 1000+ hours at elevated temperature and humidity, whereas the RLR20C5R49FMRE6 demonstrates <0.1% typical drift under equivalent stress due to its sealed construction and stabilized film technology. The ±100ppm/°C temperature coefficient of the RLR20C5R49FMRE6 also ensures predictable compensation in feedback networks and precision measurement circuits, whereas commercial alternatives often exhibit nonlinear temperature behavior that complicates circuit design. For applications requiring periodic recalibration or where 1% initial tolerance must be maintained throughout service life, the RLR20C5R49FMRE6 design eliminates the need for frequent adjustment.

Why is the 1% tolerance specification of the RLR20C5R49FMRE6 critical for current-limiting and power distribution circuits?: In current-limiting applications, the RLR20C5R49FMRE6's ±1% tolerance ensures that the designed current threshold remains within a narrow band across production units. If a circuit requires exactly 200mA maximum current, using the RLR20C5R49FMRE6 with its tight tolerance ensures that 99% of installed units deliver 5.39–5.59 Ohms rather than the ±5–10% variation typical of standard carbon-film resistors. This predictability eliminates the need for manual trimming potentiometers in production, reducing assembly cost and potential field failures due to drift. In power distribution monitoring, where the RLR20C5R49FMRE6 serves as a shunt for supply current measurement, the tight tolerance directly translates to measurement accuracy; a ±1% resistor error combined with ±0.5% ADC error yields total current-sense uncertainty under 1.5%, meeting industrial and military system-level specs.

How does the 0.5W power rating of the RLR20C5R49FMRE6 constrain design choices in high-current applications?: The 0.5W (1/2W) power rating of the RLR20C5R49FMRE6 establishes hard limits: at 3 amperes, dissipation reaches approximately 49.4 watts per resistor, requiring 99 units in parallel to stay within thermal limits. For single-resistor operation, continuous current must remain below approximately 300mA to avoid exceeding 0.5W dissipation. Designers often encounter this constraint in DC-DC converter current-sense applications, where higher-current topologies require resistor arrays or current-sense ICs with integrated gain rather than discrete RLR20C5R49FMRE6 elements. The axial package also lacks integrated thermal sinking; engineers must account for PCB copper area and airflow to achieve rated performance. In applications combining the RLR20C5R49FMRE6 with high-frequency switching (>100kHz), AC losses and skin-effect current concentration may further reduce practical power capacity, requiring derating by 20–30%.

Can the RLR20C5R49FMRE6 be safely used in circuits operating near its maximum temperature limits without derating?: The RLR20C5R49FMRE6 is rated to 150°C maximum, but sustained operation at full power (0.5W) at 150°C approaches the thermal stress limit of the metal film substrate and wire terminations. Military practice typically applies a 20–30% power derating at elevated temperatures; operating the RLR20C5R49FMRE6 at 0.35W or less when ambient reaches 125°C ensures margin for PCB hot spots and component interaction. The ±100ppm/°C temperature coefficient becomes increasingly relevant at temperature extremes: the RLR20C5R49FMRE6 experiencing a 100°C swing from 25°C to 125°C will exhibit approximately 0.55% resistance increase, which is cumulative with the ±1% manufacturing tolerance. In feedback circuits or precision current sources, this temperature-induced drift of the RLR20C5R49FMRE6 may require compensation networks or specification of tighter operating ranges to maintain system accuracy.

What soldering and thermal management practices optimize reliability of the RLR20C5R49FMRE6 during PCB assembly and field operation?: The RLR20C5R49FMRE6's weldable leads support wave-soldering and selective soldering processes; the metal film element is robust to standard reflow profiles (up to 260°C peak for 10 seconds per IPC-J-STD-020) without performance degradation. However, thermal shock—rapid transitions between cold and hot environments—can create stress at the wire-to-film interface; manufacturers recommend avoiding thermal cycling rates exceeding 50°C per minute near the RLR20C5R49FMRE6. For permanent reliability gains, position the RLR20C5R49FMRE6 to maximize airflow around its body rather than in confined areas of the PCB. If sustained currents approach 0.4W, place the RLR20C5R49FMRE6 away from heat-generating components (voltage regulators, switching MOSFETs) by at least 15mm to prevent cumulative temperature rise. Military specifications often mandate potting or conformal coating around the RLR20C5R49FMRE6 to exclude moisture; if applied, use low-volatility coatings that do not create vapor pressure within the resistor body.

How does the RLR20C5R49FMRE6 compare to integrated current-sense IC solutions in terms of accuracy, cost, and design complexity?: Discrete RLR20C5R49FMRE6 resistors offer simplicity and cost-per-unit advantage when single-figure accuracy (±1%) suffices; no external amplification, biasing, or signal conditioning is required. However, integrated current-sense ICs incorporate gain (typically 20–80V/V), built-in filtering, and temperature compensation, enabling measurement across wider current ranges with better noise rejection—essential in switching power supplies where high dV/dt transients corrupt unfiltered analog readings. The RLR20C5R49FMRE6 design requires careful PCB layout (star grounding, kelvin sensing) to achieve IC-equivalent accuracy, increasing design time and PCB area. For precision applications below 100mA or where multiple measurement channels exist, an integrated IC (such as a dedicated current-sense amp paired with the RLR20C5R49FMRE6 as the sense element) often yields lower total component count and superior performance than discrete resistor chains, though at higher unit cost. The RLR20C5R49FMRE6 remains the standard choice in cost-sensitive, lower-performance designs and in legacy military equipment where pin-compatible replacements are mandatory.

What is the failure mode of the RLR20C5R49FMRE6 under overload, and how does the M-level failure rate translate to system-level reliability?: The RLR20C5R49FMRE6 exhibits an M-level failure rate (1% per 1000 hours under rated stress), typical of military-qualified discrete resistors. Under sustained overload (2–3× rated power), the metal film element gradually oxidizes and becomes brittle; rather than catastrophic open-circuit failure, the RLR20C5R49FMRE6 typically drifts upward in resistance (5–20% increase) over hours before finally opening. This graceful degradation provides partial warning in monitoring circuits but may cause undetectable malfunction in current-limiting applications where resistance increase is misinterpreted as load change. At the system level, a 0.5W circuit relying on 10 RLR20C5R49FMRE6 resistors experiences cumulative failure probability; over 10,000 operating hours, the expected number of failures approaches 0.1 (one failure in ten units with moderate confidence). Military designs typically specify redundancy, self-healing topologies, or cross-monitoring of the RLR20C5R49FMRE6 chains to detect and isolate open failures before they propagate.

Is the RLR20C5R49FMRE6 suitable for high-frequency AC or RF applications, or is it primarily intended for DC circuits?: The RLR20C5R49FMRE6 is optimized for DC and low-frequency AC (below ~100kHz) applications. At higher frequencies, skin effect and distributed inductance from the axial lead geometry (0.375" long) cause the effective resistance to vary with frequency; at 10MHz, the RLR20C5R49FMRE6 may exhibit 2–5% resistance increase and measurable reactive component. For RF power applications, the lead inductance introduces impedance mismatch, necessitating series compensation or high-frequency-rated resistor networks. The metal film construction of the RLR20C5R49FMRE6 also exhibits noise characteristics unsuitable for low-noise preamplifier feedback; for audio and precision measurement below 1MHz, thin-film or bulk-metal alternatives with superior noise figures are preferred. The RLR20C5R49FMRE6 is acceptable in DC supply bypass chains and EMI filter networks where frequency response flatness is not critical.

What environmental compliance certifications does the RLR20C5R49FMRE6 hold, and what are the implications for procurement and use restrictions?: The RLR20C5R49FMRE6 is RoHS non-compliant and REACH-affected, meaning it may contain lead and other regulated substances and requires explicit exemption in European Union applications. For EU consumer products, this creates procurement barriers; however, military and aerospace applications (exemption 39 and similar authorizations) permit continued use under defined supply-chain controls. The ECCN classification (EAR99) means the RLR20C5R49FMRE6 is not subject to U.S. export restrictions for most end-uses, facilitating international supply. Procurement must verify REACH exemption status with the distributor and confirm that supply-chain documentation meets customer compliance requirements. Non-compliance does not affect performance; it reflects manufacturing process legacy common to military-specification resistors from this era. For new designs requiring EU compliance, Vishay offers RoHS-compliant alternatives in the RLR20 series, though at potential cost premium and with need to re-qualify current-sense circuits.

How should the RLR20C5R49FMRE6 be specified in a design brief to ensure procurement of the exact variant and avoid accidental substitution?: Full part number RLR20C5R49FMRE6 must be used in bill-of-materials and procurement documents; abbreviated references (such as RLR20 or 5.49Ω) risk substitution with incompatible variants. The RLR20C5R49FMRE6 designation encodes: RLR20 (military film resistor series), C (military-qualified, moisture-resistant), 5R49 (5.49 Ohm resistance), F (1% tolerance), M (M-level failure rate), R (axial package), E (lead finish), 6 (tape & reel packaging). Omitting the 'E' or '6' suffixes may result in alternate lead finishes (which affect solderability) or bulk packaging (complicating production logistics). Cross-references to similar commercial parts (such as MBB or VF series) are acceptable for preliminary design but must not be used in final procurement specs. Military or aerospace customers often require traceability to original Vishay manufacturing date codes; specify procurement from authorized distributors and request first-article inspection (FAI) documentation to confirm correct part identity.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay Dale RLR20C5R49FMRE6

Product Attribute
Part Number	RLR20C5R49FMRE8	RLR20C5R49FRRE6	RLR20C5R49FMRE7	RLR20C5R49FMRE5
Manufacturer	Vishay Dale	Vishay Dale	Vishay Dale	Vishay Dale
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Temperature Coefficient	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Failure Rate	-	-	-	-
Power (Watts)	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Features	-	-	-	Simultaneous Sampling
Size / Dimension	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Composition	-	-	-	-
Resistance	-	-	-	-
Tolerance	-	-	-	-
Series	-	-	-	-
Number of Terminations	-	-	-	-
Height - Seated (Max)	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C

RLR20C5R49FMRE6 Datasheet PDF

Download RLR20C5R49FMRE6 pdf datasheets and Vishay Dale documentation for RLR20C5R49FMRE6 - Vishay Dale.

Datasheets: ERL (Military RLR).pdf

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I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.
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