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Home Products Resistors Through Hole Resistors~~RWR89S1540FRS70~~

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RWR89S1540FRS70 - Vishay Dale

Name: Vishay Dale RWR89S1540FRS70
Brand: Vishay Dale
SKU: RWR89S1540FRS70
Price: 3.988 USD
Availability: InStock
Rating: 5 (4 reviews)

Manufacturer Part Number: RWR89S1540FRS70

Manufacturer: Dale / Vishay

Allelco Part Number: 98D-RWR89S1540FRS70

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 41,037 pcs available, New & Original

Parts Description: RES 154 OHM 3W 1% WW AXIAL

Package: Axial

Data sheet: RWR89S1540FRS70.pdf

HTML Datasheet
RWR Series, Military.pdf

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Specifications

RWR89S1540FRS70 Tech Specifications
Vishay Dale - RWR89S1540FRS70 technical specifications, attributes, parameters and parts with similar specifications to Vishay Dale - RWR89S1540FRS70

Product Attribute	Attribute Value
Manufacturer	Dale / Vishay
Tolerance	±1%
Temperature Coefficient	±20ppm/°C
Supplier Device Package	Axial
Size / Dimension	0.187' Dia x 0.560' L (4.75mm x 14.22mm)
Series	Military, MIL-PRF-39007, RWR89S
Resistance	154 Ohms
Power (Watts)	3W
Package / Case	Axial

Product Attribute	Attribute Value
Package	Tape & Reel (TR)
Operating Temperature	-55°C ~ 250°C
Number of Terminations	2
Height - Seated (Max)	-
Features	Military, Moisture Resistant
Failure Rate	R (0.01%)
Composition	Wirewound
Base Product Number	RWR89

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	Not Applicable
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8533.21.0080

Frequently Asked Questions(FAQ)

What makes the RWR89S1540FRS70 suitable for high-temperature military applications compared to standard carbon film resistors?: The RWR89S1540FRS70 is a wirewound resistor rated for continuous operation from -55°C to 250°C, enabling deployment in aerospace, defense, and downhole instrumentation where ambient temperatures exceed typical industrial ranges. Carbon film resistors typically max out at 125–150°C and exhibit significant resistance drift at elevated temperatures. The RWR89S1540FRS70's ±20ppm/°C temperature coefficient ensures predictable 154-ohm performance across this extended range, whereas carbon film alternatives may drift 1000+ ppm/°C. This stability is critical in precision signal conditioning, thermal protection circuits, and load-balancing networks that must maintain tolerance through thermal cycling.

How does the 3W power rating of the RWR89S1540FRS70 influence thermal design in confined spaces?: The RWR89S1540FRS70 dissipates 3W at maximum current (approximately 140mA continuous at 154 ohms), requiring careful thermal management in compact assemblies. The axial through-hole form factor (0.187" diameter, 0.560" length) creates a relatively high surface-area-to-volume ratio that aids convective cooling, but sustained operation near rated power will raise junction temperature by 100–150°C above ambient depending on board layout and airflow. In sealed or thermally dense environments, derating to 50–60% of rated power (1.5–1.8W) is prudent to maintain long-term reliability. Conversely, in well-ventilated applications or with forced air cooling, the RWR89S1540FRS70 can deliver full 3W without requiring external heatsinking.

What are the practical differences between the RWR89S1540FRS70 and thin-film precision resistors for meter-class measurement circuits?: The RWR89S1540FRS70 and thin-film resistors serve different design niches. Thin-film alternatives offer tighter initial tolerance (0.1%) and lower temperature coefficients (±25–50 ppm/°C), but the RWR89S1540FRS70's ±1% tolerance and ±20ppm/°C spec are adequate for most industrial and military current-sensing, load-balancing, and fault-detection applications. The RWR89S1540FRS70 provides three to ten times greater power dissipation capacity than comparable thin-film packages, making it suitable for high-current paths where thin-film devices would require parallel arrays or external sense resistors. Thin-film resistors excel in precision analog-to-digital conditioning and low-level signal paths; the RWR89S1540FRS70 dominates power distribution, thermal management, and transient-protected load circuits.

Why is the RWR89S1540FRS70 classified as RoHS non-compliant, and how does this affect procurement for new military programs?: The RWR89S1540FRS70 contains lead in its solder terminations and internal construction, reflecting its MIL-PRF-39007 military specification lineage. Military and defense programs often require RoHS exemptions for high-reliability applications where lead-free solder introduces reliability risks—including higher reflow temperatures, increased brittle-fracture susceptibility, and unproven long-term field performance at extreme temperatures. Programs using the RWR89S1540FRS70 must secure formal RoHS exemption documentation or specify alternative compliant resistors if procurement policy forbids non-compliant components. Commercial-grade applications in EU markets or subject to consumer regulation face procurement restrictions; military, aerospace, and medical device programs can often proceed with exemptions provided by the OEM or system integrator.

How does the RWR89S1540FRS70's wirewound construction affect its high-frequency behavior and EMI characteristics?: Wirewound resistors, including the RWR89S1540FRS70, exhibit inductive reactance due to the coiled wire structure, typically 10–50 nanohenries for an axial package of this size. At frequencies above 1 MHz, this inductance creates impedance rise and phase shift that can degrade performance in RF filtering, impedance matching, and high-speed transient protection circuits. The RWR89S1540FRS70 is optimized for low-frequency power and precision DC applications rather than broadband RF work. For high-frequency applications requiring low inductance, thin-film or bulk-metal foil resistors are preferred. However, the RWR89S1540FRS70 remains suitable for 50–500 kHz switching supplies, audio circuits, and fault-detection paths where inductance does not significantly affect performance.

What is the expected failure rate and mean time between failures (MTBF) for the RWR89S1540FRS70 in field service?: The RWR89S1540FRS70 carries a failure rate designation of R (0.01% per 1000 hours) per MIL-HDBK-217F, implying approximately 100 MTBF hours under rated conditions—a conservative estimate used for military procurement screening. This translates to roughly 11,400 years MTBF at 1-sigma operating margin, but actual field reliability depends heavily on thermal cycling, vibration, humidity exposure, and deration practice. When operated below 60% rated power in stable environments, the RWR89S1540FRS70 commonly achieves 50,000+ operating hours without failure. Military and aerospace programs typically apply additional derating factors (often 20–40% of rated power) to achieve field failure rates below 0.01% per 1000 hours, pushing projected MTBF into the multi-decade range.

How does the RWR89S1540FRS70 perform under thermal cycling between -55°C and 250°C, and what are the cumulative fatigue concerns?: Thermal cycling induces mechanical stress at the solder joints and within the wire element of the RWR89S1540FRS70 due to mismatched coefficient of thermal expansion (CTE) between the copper wire (~17 ppm/°C), ceramic coating, and lead terminations. Each full cycle (-55°C to 250°C) imposes roughly 0.05–0.15% strain, and cumulative fatigue can reduce shear strength at terminations after 500–2000 cycles depending on solder alloy and board design. Military avionics and engine-mounted applications may experience 100–300 thermal cycles over service life; submarine and downhole instruments may see fewer but more severe cycles. Thermal cycling combined with vibration or mechanical shock significantly accelerates failure; therefore, applications with simultaneous thermal and mechanical stress should implement vibration isolation and consider RWR89S1540FRS70 placement away from high-stress stress concentrators on the PCB.

What is the moisture absorption and ingress profile of the RWR89S1540FRS70, and does moisture-resistant designation eliminate conformal coating requirements?: The RWR89S1540FRS70 is rated as moisture-resistant per MIL-PRF-39007, meaning the wire element is coated with a ceramic or glass-enameled layer that resists surface moisture and reduces corrosion initiation. However, moisture-resistant does not mean hermetic or moisture-proof; sustained exposure to condensation, salt spray, or 95% relative humidity can eventually penetrate the terminations and cause resistance drift or open-circuit failure. High-reliability military and marine applications still apply conformal coating (acrylic or urethane) over the RWR89S1540FRS70 to provide additional environmental protection. In clean, dry operating environments (sealed enclosures with desiccant), the RWR89S1540FRS70's intrinsic moisture resistance is often sufficient. Harsh outdoor, marine, or subsea applications require conformal coating despite the moisture-resistant rating.

How should the RWR89S1540FRS70 be derated for continuous operation in a military avionics enclosure with internal temperature of 85°C?: At an 85°C ambient inside a sealed avionics box, the RWR89S1540FRS70 experiences self-heating, raising internal temperature by 50–100°C depending on power level. Operating at full 3W would push junction temperature to approximately 135–185°C, within the 250°C absolute rating but above the thermal comfort zone for long-term reliability. A practical deration strategy limits the RWR89S1540FRS70 to 1.5–2W (50–67% of rated power) at 85°C ambient, maintaining internal temperature below 150°C and preserving resistive stability. At 2W and 85°C ambient, the 154-ohm value remains within ±1% tolerance and the component operates comfortably with MTBF exceeding 10,000 hours. This deration margin also accommodates seasonal temperature fluctuations and allows for component aging.

Why might a designer choose the RWR89S1540FRS70 over a precision metal-film resistor for a 3W, 154-ohm load-balancing network in a high-reliability application?: Metal-film resistors rarely exceed 0.5W power rating in compact packages and would require parallel configurations to achieve 3W capacity, complicating PCB layout and introducing matching uncertainty. The RWR89S1540FRS70 delivers the required 3W from a single, proven military-qualified component with excellent long-term resistance stability (±20ppm/°C) and a traceable failure-rate pedigree. For load-balancing in multi-phase power converters, battery management systems, or current-sharing networks, the RWR89S1540FRS70's performance envelope (154Ω ±1%, 3W, -55 to 250°C) is difficult to replicate with parallel metal-film arrangements while maintaining symmetry and thermal tracking. Additionally, the RWR89S1540FRS70's extensive use in military and aerospace systems provides decades of field history and established qualification documentation, reducing design-assurance risk compared to newer or less-proven alternatives.

What soldering techniques minimize termination fatigue and ensure long-term reliability of the RWR89S1540FRS70 in high-vibration environments?: The RWR89S1540FRS70's axial leads are susceptible to fatigue-induced fractures if subjected to repeated flexing or vibration, especially near the solder joint where stress concentrates. Wave soldering and hand soldering are acceptable if the RWR89S1540FRS70 is supported by PCB routing and conformal coating to restrict lead movement. Reflow soldering is not applicable to axial through-hole components. Post-soldering, vibration-prone designs should employ mechanical stress relief: potting with epoxy or polyurethane, PCB anchoring via mechanical retainers, or board stiffening. Thermal cycling combined with vibration can reduce solder joint shear strength by 30–50% over 1000 cycles; therefore, applications subject to both thermal extremes (-55 to 250°C) and vibration (>5G continuous or shock) should implement secondary mechanical support and periodic inspection protocols.

How does the RWR89S1540FRS70's ±1% tolerance compare to worst-case stack-up in a three-element current-sensing network, and what circuit-level compensation is needed?: In a three-element current-sensing or load-sharing network using three RWR89S1540FRS70 resistors in parallel, individual tolerance stacks combine: worst-case imbalance is ±3% (one resistor at +1%, another at -1%, difference = 2% relative error). If all three match the +1% corner, effective network resistance shifts by approximately 1.4%; at the -1% corner, it shifts by -1.4%. For precision current measurement or load-balancing, this ±3% inter-resistor imbalance can introduce 3–5% error in current distribution if left uncompensated. Active circuits employing op-amp feedback or digital current-sharing feedback can trim this error to <0.5% after calibration. Passive networks rely on tight initial sorting (selecting matched pairs from the same manufacturing batch) or accepting the ±3% stack-up as inherent design margin. Specifying matched-pair or 0.5% tolerance alternatives increases cost; most military designs accept the RWR89S1540FRS70's ±1% spec and implement circuit-level trimming or calibration.

Does the RWR89S1540FRS70 require ESD precautions during manufacturing and field service, or is it inherently immune to electrostatic discharge?: The RWR89S1540FRS70 is fundamentally immune to electrostatic discharge (ESD) damage because wirewound resistors are passive, ohmic devices without semiconductor junctions or active elements. Unlike integrated circuits or diodes, the RWR89S1540FRS70 cannot be damaged by static charge accumulation. However, general assembly best practices recommend standard ESD precautions (grounded wrist straps, ESD mats, humidity control) during PCB assembly and field repair to prevent accidental damage to adjacent sensitive components and to maintain manufacturing discipline. The RWR89S1540FRS70 itself poses no ESD risk and does not require special handling bins, storage conditions, or moisture-sensitive labeling (MSL rating is not applicable per datasheet). Field service technicians can handle the RWR89S1540FRS70 freely without ESD tools, though observing general ESD protocol is recommended if servicing boards with mixed component populations.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay Dale RWR89S1540FRS70

Product Attribute
Part Number	RWR89S1540FSS70	RWR89S1540FRS73	RWR89S1540FRRSL	RWR89S1540FSRSL
Manufacturer	Vishay Dale	Vishay Dale	Vishay Dale	Vishay Dale
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Series	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Composition	-	-	-	-
Tolerance	-	-	-	-
Size / Dimension	-	-	-	-
Failure Rate	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Number of Terminations	-	-	-	-
Temperature Coefficient	-	-	-	-
Resistance	-	-	-	-
Features	-	-	-	Simultaneous Sampling
Height - Seated (Max)	-	-	-	-
Power (Watts)	-	-	-	-

RWR89S1540FRS70 Datasheet PDF

Download RWR89S1540FRS70 pdf datasheets and Vishay Dale documentation for RWR89S1540FRS70 - Vishay Dale.

HTML Datasheet: RWR Series, Military.pdf

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