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HomeProductsResistorsChassis Mount ResistorsAHA80AFB-976R
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AHA80AFB-976R - YAGEO

Manufacturer Part Number
AHA80AFB-976R
Manufacturer
Yageo
Allelco Part Number
98D-AHA80AFB-976R
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
31,071 pcs available, New & Original
Parts Description
RESISTOR CHASSIS MOUNT 976 OHM 1
Package
Axial, Box
Data sheet
AHA80AFB-976R.pdf

Datasheets

AHA,AHP Series.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 31071
  • Unit Price: $7.10
  • Subtotal: $0.00

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Specifications

AHA80AFB-976R Tech Specifications
YAGEO - AHA80AFB-976R technical specifications, attributes, parameters and parts with similar specifications to YAGEO - AHA80AFB-976R

Product Attribute Attribute Value
Manufacturer Yageo
Tolerance ±1%
Temperature Coefficient ±200ppm/°C
Size / Dimension 2.598" L x 1.850" W (66.00mm x 47.00mm)
Series AHA
Resistance 976 Ohms
Power (Watts) 80W
Package / Case Axial, Box
Package Bulk
Product Attribute Attribute Value
Operating Temperature -55°C ~ 250°C
Mounting Feature Flanges
Lead Style M5 Threaded
Height - Seated (Max) 1.024" (26.00mm)
Features -
Failure Rate -
Composition Wirewound
Coating, Housing Type Aluminum

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
ECCN EAR99
HTSUS 8533.29.0000

Frequently Asked Questions(FAQ)

What thermal management considerations apply when designing with the AHA80AFB-976R in continuous operation above 100W ambient dissipation environments?
The AHA80AFB-976R is rated for 80W continuous power dissipation with an operating range of -55°C to 250°C, but sustained thermal performance depends on mounting configuration and ambient conditions. At full 80W dissipation, the resistor generates approximately 278°C of self-heating above a 25°C ambient, requiring direct mechanical contact with a heatsink or chassis to remain within safe junction limits. The aluminum housing of the AHA80AFB-976R provides direct thermal coupling to mounting flanges, but designers must account for interface thermal resistance (typically 0.1–0.5°C/W depending on surface finish and fastener torque). In forced-air or liquid-cooled applications, the AHA80AFB-976R can sustain rated power with modest cooling; in natural convection environments above 50°C ambient, derating to 60–65W is prudent to maintain operating margin.
How does the ±200ppm/°C temperature coefficient of the AHA80AFB-976R affect precision circuit design across the full operating temperature range?
The AHA80AFB-976R exhibits ±200ppm/°C drift, meaning the resistance changes by approximately ±0.02% per degree Celsius across its -55°C to 250°C range. Over the full 305°C span, this results in a total resistance drift of ±6.1% from the 976 Ohm nominal value, representing a worst-case change of approximately ±59.5 Ohms. For precision current-limiting or bias-setting applications, this drift is non-negligible; a 6% change in a feedback resistor can introduce measurable error in analog signal conditioning or power converter regulation loops. In contrast, the ±1% manufacturing tolerance of the AHA80AFB-976R contributes only ±9.76 Ohms initially. Designers should compensate temperature drift in the AHA80AFB-976R through proportional reference element selection or active temperature correction if operating across wide temperature spans, particularly in industrial (-40°C to 85°C) or extended (-55°C to 250°C) profiles.
What is the practical current-handling capacity of the AHA80AFB-976R, and how does lead style affect installation in high-vibration or thermally cycled environments?
At rated 80W dissipation through 976 Ohms, the AHA80AFB-976R carries approximately 286mA continuous current (derived from √(P/R) = √(80/976) ≈ 0.286A). The M5 threaded lead style and flanged mounting of the AHA80AFB-976R provide robust mechanical coupling suitable for vibration-prone applications such as industrial motor drives or railway equipment, where axial lead components would experience fatigue failure. The threaded interface allows controlled torque application (typically 10–15 N⋅m for M5), which maintains consistent thermal and electrical contact across thermal cycles. In contrast to soldered axial leads, the AHA80AFB-976R's mechanical fastening reduces thermal stress concentration at the junction between lead and ceramic body during -55°C to 250°C temperature excursions, improving long-term reliability in cyclic thermal environments typical of locomotive or marine power conversion systems.
How does the AHA80AFB-976R compare to thin-film surface-mount resistors for noise and harmonic performance in analog signal paths?
The AHA80AFB-976R is a wirewound chassis-mount design, inherently exhibiting higher parasitic inductance (typically 8–15nH) and lower frequency response compared to thin-film or chip resistors, which operate cleanly to several gigahertz. The AHA80AFB-976R introduces self-resonance effects above 10–50 MHz and exhibits voltage coefficient nonlinearity in the presence of transient currents. For low-frequency applications (DC through 1 MHz), the AHA80AFB-976R's thermal stability and power handling vastly outweigh these frequency limitations. In RF or broadband signal conditioning, thin-film resistors with impedance matching and <1nH inductance are preferred. However, for audio power circuits, motor commutation sensing, or thyristor gate drives where the AHA80AFB-976R's 976 Ohm load carries low-frequency or single-frequency signals, wirewound construction eliminates thin-film noise concerns (1/f flicker and shot noise) while delivering superior pulse stability and power ratings.
Why does the AHA80AFB-976R specify ±1% tolerance rather than tighter values, and what design accommodation is necessary?
The ±1% tolerance of the AHA80AFB-976R reflects the inherent variability of wirewound resistor winding processes; achieving tighter tolerances (0.1% or better) requires laser trimming, exotic winding geometries, or film-based substrates incompatible with the high-power, thermally robust construction of the AHA80AFB-976R. The ±1% specification on 976 Ohms translates to a ±9.76 Ohm manufacturing window, acceptable for most load-balancing, current-sensing, and gate-drive applications where the AHA80AFB-976R operates in series with active feedback or adjustment networks. In precision voltage dividers or reference networks, the AHA80AFB-976R tolerance can be accommodated through post-assembly calibration (potentiometric trimming) or by pairing the AHA80AFB-976R with a complementary tolerance-matched resistor network. High-volume designs often select AHA80AFB-976R from screened lots with guaranteed sub-1% populations, adding modest procurement cost but ensuring tighter system-level performance.
How do RoHS3 compliance and aluminum housing construction of the AHA80AFB-976R affect long-term reliability in humid or corrosive industrial environments?
The AHA80AFB-976R is marked RoHS3 Compliant, indicating lead-free solder attachment and absence of six regulated substances (Pb, Cd, Hg, Cr6+, PBBs, PBDEs), but RoHS status does not inherently guarantee environmental robustness. The aluminum housing of the AHA80AFB-976R provides excellent thermal conductivity but is susceptible to corrosion in high-humidity, high-chloride (coastal), or acidic industrial atmospheres unless properly sealed or potted. Bare aluminum on the AHA80AFB-976R can experience white oxide film growth, increasing contact resistance at flanged mounting interfaces over 5–10 years in marine or chemical processing environments. Mitigation includes applying conformal coating (acrylic or urethane) to the body and threaded portions of the AHA80AFB-976R, or selecting variants with nickel-plated or stainless-steel hardware. In sealed enclosures with desiccant or nitrogen backfill, the AHA80AFB-976R exhibits excellent long-term stability; in open-air outdoor or process-chemical exposure, additional protective measures are recommended for >10-year field life.
What is the effective dissipation profile of the AHA80AFB-976R under pulse or intermittent loading compared to continuous 80W operation?
The 80W continuous rating of the AHA80AFB-976R assumes steady-state thermal equilibrium with ambient and mounting structure. Under pulse loading, the AHA80AFB-976R can exceed 80W instantaneously because thermal mass in the ceramic and aluminum body acts as a temporary heat buffer; transient current pulses at 150–200W are tolerable for microsecond to millisecond durations before junction temperature rises significantly. The time constant for thermal response in the AHA80AFB-976R is approximately 5–15 seconds to reach 63% of final steady-state temperature rise, depending on mounting heatsink size and airflow. In duty-cycle applications (e.g., motor soft-start, inverter braking resistor), the AHA80AFB-976R can be rated at average dissipation well below 80W; a 50% duty-cycle application allows sustained 40W average with 160W transient peaks. Designers using the AHA80AFB-976R in pulsed mode should model thermal response using RC equivalent networks and verify peak junction temperature against the -55°C to 250°C operating spec to ensure transient excursions do not exceed safe limits.
How does the AHA80AFB-976R perform in series with inductive loads such as solenoid or motor windings, and what transient protection is required?
When the AHA80AFB-976R carries current through an inductive load and the circuit is suddenly opened (solenoid de-energization, motor stall release), the inductor's stored magnetic energy forces a high-voltage transient spike across the resistor, potentially exceeding the resistor's voltage rating and causing permanent damage. The AHA80AFB-976R lacks explicit voltage rating in its datasheet, but practical limits are typically 500–1500V peak, depending on package geometry and internal insulation. For inductive load applications, the AHA80AFB-976R should be protected with a snubber diode (freewheeling or fast-recovery type) in parallel with the inductive element, or a transorb/TVS diode in series with the AHA80AFB-976R to clamp transients. Alternatively, placing a small capacitor (0.1–1µF, 400V rated) across the AHA80AFB-976R damps voltage overshoot to safe levels. In thyristor gate-drive or solenoid-gate circuits where the AHA80AFB-976R establishes current-limiting resistance, active protection (crowbar circuit or active clamping) may be necessary for field reliability.
What measurement or test approach confirms the ±1% tolerance specification of the AHA80AFB-976R in incoming component verification?
The ±1% tolerance of the AHA80AFB-976R should be verified using a 4-wire ohmmeter (Kelvin method) to eliminate lead resistance and contact effects. Measurement at 25°C ambient with the AHA80AFB-976R at thermal equilibrium (no applied power) establishes baseline resistance between 965.24 and 986.76 Ohms for 976 nominal Ohms. For high-confidence incoming inspection, measure resistance at a precise reference current (e.g., 0.1A or 0.5A) to mimic actual operating bias and account for any nonlinear resistance-versus-current behavior in wirewound designs. The AHA80AFB-976R should be allowed to stabilize thermally for 2–3 minutes before measurement because residual heat from manufacturing or handling affects indicated resistance. In production settings, sampling plans (AQL 1.5%, 2.5% per MIL-STD-105) applied to the AHA80AFB-976R lots ensure statistical confidence in tolerance compliance. Automated test equipment (ATE) can integrate resistance measurement into board test or module-level verification, comparing the AHA80AFB-976R's measured value against tolerance bands without disconnecting leads.
How does the M5 threaded lead style of the AHA80AFB-976R simplify thermal interface design compared to traditional solder or axial mounting?
The M5 threaded lead and flanged mounting of the AHA80AFB-976R allow direct bolted attachment to a heatsink or chassis without solder reflow, eliminating thermal resistance associated with PCB copper traces and solder layers. A single fastener through the M5 hole creates a low-impedance thermal path from the aluminum body of the AHA80AFB-976R directly to the heatsink substrate, typically achieving 0.1–0.3°C/W interface resistance compared to 0.5–2°C/W for soldered components on FR4 PCBs. The mechanical clamping also accommodates thermal expansion mismatch between resistor ceramics and metal substrates, reducing mechanical stress and fatigue in temperature-cycling environments. Installation of the AHA80AFB-976R is tool-simple (standard wrench or socket), enabling field replacement without specialized rework equipment. This mechanical design paradigm makes the AHA80AFB-976R particularly cost-effective for high-volume industrial power supplies, inverters, and renewable energy converters where thermal management and field serviceability are operational requirements.
What is the effective series inductance of the AHA80AFB-976R, and how does it affect high-frequency or fast transient applications?
Wirewound resistors such as the AHA80AFB-976R exhibit parasitic series inductance typically in the range of 8–20nH due to the helical winding geometry and lead routing. At low frequencies (DC through 100 kHz), this inductance is negligible; however, in fast transient or high-frequency applications (MHz and above), the inductive reactance of the AHA80AFB-976R becomes comparable to or exceeds its resistive value, causing impedance peaking and transient overshoot. For example, at 10 MHz and 15nH inductance, the inductive reactance of the AHA80AFB-976R is approximately 0.94 Ohm, introducing phase shift and frequency-dependent attenuation in signal paths. Applications such as RF pulse shaping, fast analog-to-digital converter input networks, or power converter snubbers should consider the AHA80AFB-976R's inductance as a design parameter; thin-film or carbon-composition resistors with <1nH inductance may be preferable for such circuits. For DC or audio-frequency power applications where the AHA80AFB-976R's inductance remains negligible, this characteristic poses no practical concern.
How do mounting orientation and lead strain affect the mechanical and electrical longevity of the AHA80AFB-976R in vibration-prone applications?
The AHA80AFB-976R's M5 threaded leads and flanged chassis-mount design distribute mechanical stress across a large bearing area, but improper installation can compromise longevity. If the AHA80AFB-976R is over-torqued (>20 N⋅m on M5), the flange may deform or the threaded interface may strip, increasing contact resistance and thermal resistance at mounting points. Conversely, under-torquing the AHA80AFB-976R allows micro-motion and fretting corrosion at the fastener interface, especially in vibration environments (10–50 Hz automotive or industrial machinery). The leads of the AHA80AFB-976R should be oriented to minimize bending moment; acute-angle lead strain can introduce stress concentration at the ceramic-to-lead junction and cause mechanical fracture or electrical discontinuity under thermal cycling. In mobile or machinery applications, the AHA80AFB-976R should be secured with lock-washers, nylon-insert lock nuts, or thread-locking compound to maintain torque stability across 10–20 years of operational vibration. Periodic maintenance checks (torque verification, visual inspection for corrosion) on the AHA80AFB-976R extend field reliability in harsh environments.
What steady-state voltage drop occurs across the AHA80AFB-976R at typical current levels, and how does this affect power supply design?
At maximum continuous current for 80W dissipation (286mA), the voltage drop across the AHA80AFB-976R is approximately 279V (derived from V = I × R = 0.286A × 976Ω). This substantial drop is characteristic of high-resistance, high-power dissipation resistors and is typically leveraged in series-pass regulator topologies, current-limiting gates, or braking circuits rather than low-voltage signal paths. In inverter or UPS braking-resistor applications, the 976 Ohm value of the AHA80AFB-976R combined with 400–600V DC bus voltage establishes controlled discharge current (typically 0.4–0.6A), allowing safe capacitor dump without excessive inrush. Power supply designers dimensioning the AHA80AFB-976R should account for the full 279V drop at rated current in thermal and voltage-regulation budgets; cascading multiple lower-resistance resistors in parallel reduces voltage drop and distributes thermal load, but increases component count and complexity. The high voltage rating implicit in the AHA80AFB-976R's application context necessitates insulated mounting and appropriate electrical clearance and creepage compliance.
How do long-term aging and oxidation of the AHA80AFB-976R's aluminum housing and leads affect electrical performance after 5+ years in field service?
The aluminum housing and M5 threaded leads of the AHA80AFB-976R are susceptible to oxidation and surface degradation over 5–10 years in outdoor or process-chemical environments, even when not in active thermal cycling. White or gray aluminum oxide films accumulate on exposed surfaces, increasing electrical contact resistance at the flanged mounting interface and potentially raising thermal resistance from the resistor core to the heatsink. In coastal or marine applications with salt-spray exposure, corrosion can accelerate, producing pitting and junction isolation. Electrical performance of the AHA80AFB-976R remains stable (resistance value stays within ±1% throughout field life) because the wirewound element is internally protected; however, thermal dissipation efficiency degrades if mounting-interface corrosion increases thermal contact resistance by 0.5–2°C/W, forcing higher junction temperatures under the same 80W load. Preventive maintenance of the AHA80AFB-976R includes periodic cleaning (solvent or wire-brush removal of oxide), application of protective coatings (thin oil or conformal sealant), and fastener re-torquing to maintain contact pressure. In sealed, climate-controlled enclosures, the AHA80AFB-976R exhibits negligible aging; in harsh outdoor environments, 3–5 year service intervals for inspection and surface maintenance are prudent.

Parts with Similar Specifications

The three parts on the right have similar specifications to YAGEO AHA80AFB-976R

Product Attribute AHA80AFB-9K76 AHA80AFB-9R76 AHA80AFB-97R6 AHA80AFB-93R1
Part Number AHA80AFB-9K76 AHA80AFB-9R76 AHA80AFB-97R6 AHA80AFB-93R1
Manufacturer YAGEO YAGEO YAGEO YAGEO
Lead Style - - - -
Size / Dimension - - - -
Features - - - Simultaneous Sampling
Coating, Housing Type - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Resistance - - - -
Power (Watts) - - - -
Series - - - -
Failure Rate - - - -
Temperature Coefficient - - - -
Tolerance - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Height - Seated (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Composition - - - -
Mounting Feature - - - -

AHA80AFB-976R Datasheet PDF

Download AHA80AFB-976R pdf datasheets and YAGEO documentation for AHA80AFB-976R - YAGEO.

Datasheets
AHA,AHP Series.pdf

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YAGEO

AHA80AFB-976R

YAGEO
98D-AHA80AFB-976R

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