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WSHM2818R0140FEA - Vishay Dale

Manufacturer Part Number: WSHM2818R0140FEA

Manufacturer: Dale / Vishay

Allelco Part Number: 98D-WSHM2818R0140FEA

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 47,601 pcs available, New & Original

Parts Description: RES 0.014 OHM 1% 7W 2818

Package: 2818

Data sheet: WSHM2818R0140FE.pdf

Datasheets
WSHM2818 Series Prod Sheet.pdf WSHM2818.pdf

RoHs Status: ROHS3 Compliant

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Specifications

WSHM2818R0140FEA Tech Specifications
Vishay Dale - WSHM2818R0140FEA technical specifications, attributes, parameters and parts with similar specifications to Vishay Dale - WSHM2818R0140FEA

Product Attribute	Attribute Value
Manufacturer	Dale / Vishay
Tolerance	±1%
Temperature Coefficient	±75ppm/°C
Supplier Device Package	2818
Size / Dimension	0.280" L x 0.181" W (7.10mm x 4.60mm)
Series	WSHM2818
Resistance	14 mOhms
Ratings	AEC-Q200
Power (Watts)	7W

Product Attribute	Attribute Value
Package / Case	Nonstandard
Package	Tape & Reel (TR)
Operating Temperature	-65°C ~ 170°C
Number of Terminations	2
Height - Seated (Max)	0.069" (1.75mm)
Features	Automotive AEC-Q200, Current Sense, Moisture Resistant, Pulse Withstanding
Failure Rate	-
Composition	Metal Element

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
ECCN	EAR99
HTSUS	8533.21.0030

Frequently Asked Questions(FAQ)

What makes the WSHM2818R0140FEA suitable for automotive current sensing applications compared to standard low-ohm resistors?: The WSHM2818R0140FEA is specifically designed for current-sense applications in automotive environments through its AEC-Q200 qualification, which validates reliability under thermal cycling, vibration, and humidity exposure typical in vehicle powertrains and battery management systems. The 14 mOhm resistance combined with 7W power rating and ±1% tolerance allows precise current measurement across high-current circuits while maintaining voltage drop accuracy within predictable bounds. The pulse-withstanding capability addresses transient current spikes during motor startup, inrush events, or load switching without resistance drift, which is critical for current-limiting and protection circuits. The metal-element composition and moisture-resistant construction ensure stable performance over the extended -65°C to 170°C operating range encountered in underhood and cabin environments where temperature and humidity variations are severe.

How does the temperature coefficient of the WSHM2818R0140FEA affect current measurement accuracy in thermal cycling conditions?: The ±75 ppm/°C temperature coefficient of the WSHM2818R0140FEA means resistance varies approximately 0.0075% per degree Celsius. In a 100°C temperature swing (from -55°C to +45°C, typical for underhood operation), the WSHM2818R0140FEA resistance could shift by roughly ±0.75%, compounding the ±1% initial tolerance to a potential maximum error of approximately ±1.75% at temperature extremes. For applications requiring better thermal stability, current-sense ICs with integrated temperature compensation may be preferred; however, the WSHM2818R0140FEA's performance is acceptable for many battery management, motor control, and load-monitoring circuits where 1.5–2% measurement tolerance is budgeted. System-level compensation through firmware calibration at known reference temperatures can further reduce the effective drift impact of the WSHM2818R0140FEA in production designs.

What is the practical voltage drop across the WSHM2818R0140FEA at maximum rated current, and how does this affect PCB layout and thermal management?: At maximum rated power (7W), the WSHM2818R0140FEA dissipates approximately 22.4A of current (derived from P=I²R: 7W = I² × 0.014Ω, solving for I ≈ 22.4A), producing a nominal voltage drop of 314 mV across the resistor. This voltage drop represents both a signal measurement point for current sensing and a parasitic power loss that must be dissipated as heat. The WSHM2818R0140FEA's compact 7.10mm × 4.60mm footprint and 1.75mm maximum height require careful PCB layout; the resistor should be placed on an internal layer or with generous copper area underneath to distribute heat and avoid localized temperature gradients. In high-current battery pack or motor control applications, a ground plane connection directly beneath the WSHM2818R0140FEA and star-grounding configuration for analog current measurement circuits minimizes voltage offset and noise pickup. Thermal imaging during prototype testing is recommended to verify the WSHM2818R0140FEA junction temperature remains within the -65°C to 170°C operating range under worst-case ambient and sustained current conditions.

Can the WSHM2818R0140FEA replace automotive-grade wirewound current-sense resistors in existing designs?: The WSHM2818R0140FEA offers advantages over wirewound alternatives in switching-dominated circuits due to its lower inductance and faster pulse response, making it better suited for modern high-frequency battery management and DC-DC converter applications. However, direct replacement requires verifying three factors: (1) thermal management—wirewound resistors typically have larger physical envelopes allowing easier heat dissipation, while the WSHM2818R0140FEA's compact 2818 case concentrates 7W in a smaller area, necessitating enhanced PCB copper area; (2) frequency response—the WSHM2818R0140FEA's metal-element construction exhibits flatter frequency response than wirewound designs, eliminating potential resonance issues but requiring re-verification of analog filtering stages; (3) AEC-Q200 compliance—both the WSHM2818R0140FEA and existing wirewound solutions must meet this qualification, so design approval and validation testing are mandatory before production changeover. Many automotive suppliers retain dual-sourcing strategies, using the WSHM2818R0140FEA for new architectures and wirewound types for legacy platforms requiring minimal design modification.

Why is the ±1% tolerance specification of the WSHM2818R0140FEA critical for ratiometric current sensing, and when might tighter tolerance be necessary?: The WSHM2818R0140FEA's ±1% tolerance ensures that ratio-based current measurements—common in battery pack balancing, multi-phase motor control, and redundant current-monitoring topologies—maintain consistent gain relationships across multiple measurement channels. If the WSHM2818R0140FEA and its parallel measurement resistor are both selected from the same manufacturing lot, both typically fall within the ±1% band, allowing system-level calibration to normalize residual tolerance spread. However, in high-current applications (approaching 22.4A) or those requiring absolute measurement accuracy better than 1.5%, tighter tolerance (0.5% or 0.1%) resistors should be specified, though these typically command 15–30% cost premiums and may not have AEC-Q200 qualification. Alternatively, the WSHM2818R0140FEA can be paired with a precision shunt-reference IC that provides temperature-compensated gain correction, effectively converting the ±1% tolerance into a system-level 0.5% specification through digital calibration.

How does the MSL Level 1 (Unlimited) moisture rating of the WSHM2818R0140FEA simplify supply chain and assembly logistics compared to moisture-sensitive alternatives?: The WSHM2818R0140FEA's Moisture Sensitivity Level 1 (MSL-1) designation means it can be stored and handled without desiccant packaging, pre-bake cycles, or shelf-life restrictions, significantly reducing logistics overhead. Standard reflow soldering, wave soldering, and rework procedures require no special atmospheric controls around the WSHM2818R0140FEA during assembly. In contrast, MSL-3 or higher components demand opened-package dry-cabinet storage, time-controlled floor-life tracking, and bake-outs before reflow—adding 2–4 hours to production scheduling and increasing scrap risk if handling protocols are breached. For automotive suppliers managing high-volume, geographically distributed manufacturing (e.g., Tier-1 plants in multiple regions), the WSHM2818R0140FEA's unlimited moisture tolerance reduces inventory management complexity and enables just-in-time supply strategies. This advantage becomes especially pronounced in underfilled or molded circuit pack designs where the WSHM2818R0140FEA experiences humid environments post-assembly.

What failure modes should be anticipated for the WSHM2818R0140FEA during pulse-current and inrush-current transients in battery-disconnect or load-switching circuits?: Although the WSHM2818R0140FEA carries pulse-withstanding certification, failure mechanisms in transient-heavy circuits include: (1) thermal runaway—if current pulses exceed the 22.4A steady-state limit for durations longer than the thermal time constant (~2–5 seconds for a 2818 package), the WSHM2818R0140FEA junction temperature can climb beyond 170°C, causing permanent resistance drift or open failure; (2) mechanical stress—repeated thermal cycling from pulse heating can initiate solder-joint fatigue or internal metal-element fracture, especially if the WSHM2818R0140FEA is mounted in vibration-prone locations; (3) current crowding—if PCB layout concentrates current into one end of the WSHM2818R0140FEA (poor trace routing), localized hot spots may exceed rated junction temperature despite average power calculations suggesting safe operation. Protective measures include coordinating the WSHM2818R0140FEA with upstream current-limiting inductors or snubber networks, ensuring pulse duration and frequency remain within AEC-Q200 transient specifications, and validating thermal performance under actual vehicle operating profiles during design verification.

How should the WSHM2818R0140FEA be integrated with galvanic isolation barriers in multi-pack or multi-motor automotive architectures?: In systems with multiple battery packs or motor phases monitored independently, the WSHM2818R0140FEA current-sense signal must be isolated from ground references to avoid common-mode issues and safety violations. A typical integration uses the WSHM2818R0140FEA as the primary current transducer, feeding a low-noise amplifier (gain typically 20–50V/V) with integrated Common-Mode RejectionRatio (CMRR) filtering, followed by a digital isolator (optical or magnetically coupled) rated for CAN or PWM signal transmission to the main controller. The WSHM2818R0140FEA's low resistance (14 mOhm) and stable ±1% tolerance ensure reproducible voltage signals (100–500 mV span) at the amplifier input, maximizing isolation-stage dynamic range and reducing quantization error in the ADC. System designers must also verify that the WSHM2818R0140FEA's operating temperature range (-65°C to 170°C) and the isolation barrier's temperature rating remain synchronized; in underhood environments, drift in either component can degrade overall current-measurement accuracy to levels unacceptable for fault detection or pack-balancing algorithms.

What role does the WSHM2818R0140FEA play in over-current protection circuits, and how do timing margins affect design safety?: The WSHM2818R0140FEA functions as the analog front-end for over-current detection by providing a proportional voltage drop (≈314 mV at 22.4A) that a comparator monitors against a software-programmable or fixed threshold. If system architecture requires cutting off current within 10–50 microseconds of a fault condition, the WSHM2818R0140FEA's response time (limited primarily by parasitic inductance and comparator settling time, typically 100–500 ns total) is acceptable. However, if the WSHM2818R0140FEA signal must propagate through multi-stage filtering (Common-Mode Chokes, RC networks) to reject EMI from nearby switching power supplies, the effective delay can extend to 1–10 milliseconds, increasing the risk that a short-circuit current damages downstream power stages before the WSHM2818R0140FEA signal-derived protection can react. Hardware designers must trade filtering depth (noise immunity) against response speed; typical automotive standards (ISO 26262, AEC-Q100) require safety analysis to document this timing margin and demonstrate that the WSHM2818R0140FEA's contribution to fault-detection latency does not compromise vehicle-level safety targets.

How does the WSHM2818R0140FEA compare to integrated Hall-effect or magnetoresistive current sensors for EV charging and on-board charger applications?: The WSHM2818R0140FEA is a passive current transducer (requires external amplification and analog-to-digital conversion), whereas Hall-effect and magnetoresistive ICs integrate sensing, amplification, and often isolation into a single package. For on-board charger (OBC) topologies operating at 3–7 kW, the WSHM2818R0140FEA combined with a transimpedance amplifier offers superior linearity (drift typically <0.5% over temperature) and lower BOM cost when high absolute accuracy is not critical. Integrated Hall sensors excel in applications requiring galvanic isolation without additional digital isolators, making them preferable for isolated Phase-Shifted Full-Bridge or resonant converter topologies where the WSHM2818R0140FEA would necessitate additional isolation stages. However, Hall sensors often exhibit nonlinearity and temperature drift in the 1–3% range, and their digital output reduces resolution compared to the WSHM2818R0140FEA's analog signal, which can achieve 12–16-bit ADC resolution. Cost analysis typically favors the WSHM2818R0140FEA for high-volume, non-isolated current monitoring in main charger contactors, while integrated sensors justify their cost premium in isolated auxiliary circuits or where space constraints eliminate separate amplifier stages.

What calibration and offset-compensation strategies minimize measurement error across the WSHM2818R0140FEA's temperature and production-tolerance range?: Single-point calibration at room temperature is insufficient for precision current measurement using the WSHM2818R0140FEA across its -65°C to 170°C operating range and ±1% tolerance spread. Two-point calibration (measuring amplifier output at 0A and maximum rated current at a reference temperature, then repeating at a second temperature extremum) captures both offset drift and gain nonlinearity, allowing firmware to apply piecewise-linear correction. For applications requiring better than 1% absolute accuracy, three-point calibration (0A, mid-range 50% current, and maximum 22.4A) at both -40°C and +85°C provides sufficient data to fit a second-order polynomial gain correction. Alternatively, ratiometric measurement—comparing the WSHM2818R0140FEA voltage drop to a precision voltage reference tracked across the same temperature range—can eliminate common systematic errors. Many OEM designs implement in-service calibration at periodic intervals (e.g., every 100 operating hours) using a current-sink load or motor dynamometer to empirically validate the WSHM2818R0140FEA measurement accuracy and detect long-term drift, enabling predictive alerts before measurement error exceeds safety or performance thresholds.

Why is RoHS3 compliance of the WSHM2818R0140FEA important for automotive supply-chain qualification and what exemptions apply?: The WSHM2818R0140FEA's RoHS3 compliance (Directive 2011/65/EU) restricts hazardous substances (lead, cadmium, mercury, hexavalent chromium, PBBs, PBDEs) and applies to automotive suppliers operating under EU Extended Producer Responsibility frameworks and sourcing regulations. Although many automotive OEMs historically operated under RoHS2 exemptions for on-road vehicles, the WSHM2818R0140FEA's RoHS3 designation ensures compatibility with future EU regulatory tightening and simplifies global supply chains for vehicles exported to European markets. For non-EU jurisdictions (North America, China, Japan), RoHS status is less mandated but increasingly preferred by Tier-1 suppliers for environmental stewardship and risk mitigation. The WSHM2818R0140FEA's lead-free solder compatibility and exemption from restricted plasticizer requirements simplify manufacturing handoffs and reduces qualification overhead when the component migrates across multiple OEM platforms or regional assembly plants.

How does the nonstandard 2818 case size of the WSHM2818R0140FEA (0.280" × 0.181") compare to 2512 and 2820 alternatives, and when is each preferred?: The WSHM2818R0140FEA's 2818 package (7.10mm × 4.60mm) occupies a geometric middle ground between standard 2512 (6.35mm × 3.20mm, typically 3W) and 2820 (7.20mm × 5.10mm, typically 8–10W) cases. The WSHM2818R0140FEA is preferred in current-sense applications where 7W dissipation exactly matches power budget and PCB real estate is moderately constrained; designers cannot migrate to smaller 2512 alternatives without exceeding steady-state temperature or sacrificing measurement signal robustness. The 2820 case, while offering marginally higher power rating, introduces unnecessary footprint expansion and cost increase for designs where WSHM2818R0140FEA thermal and electrical performance suffice. A practical design workflow specifies WSHM2818R0140FEA as the baseline for new development; only if thermal simulation predicts junction temperature approaching 150°C under worst-case ambient and current stress should a 2820 upgrade be considered. Legacy designs may carry 2512 alternatives, requiring verification that reduced power rating and increased resistance temperature coefficient do not compromise accuracy or thermal margin.

What electromagnetic interference (EMI) and signal-integrity considerations apply when routing the WSHM2818R0140FEA measurement traces in proximity to high-frequency switching stages?: The WSHM2818R0140FEA generates a low-impedance analog signal (voltage drop approximately 100–314 mV across 14 mOhm) that is susceptible to capacitive and inductive coupling from adjacent power-switching nodes (DC-DC converters, gate-drive circuits). Best practices include: (1) routing WSHM2818R0140FEA measurement traces on internal PCB layers sandwiched between ground planes to minimize loop area and common-mode coupling; (2) maintaining minimum 1–2 mm creepage from high-dI/dt switching nodes; (3) terminating the WSHM2818R0140FEA with a low-pass filter (typically 10 kHz cutoff) immediately adjacent to the measurement pads to attenuate switching-frequency harmonics (50 MHz to several GHz range); (4) using a differential measurement topology with matched traces back to the amplifier to cancel common-mode interference. In systems with stringent EMC requirements (automotive radiated emissions EN 61000-4-3, IEC 61000-6-2), the WSHM2818R0140FEA measurement chain often incorporates ferrite beads on both input and output to improve conducted EMI immunity. System-level testing (EMI chamber, conducted injection per ISO 7637) should validate WSHM2818R0140FEA measurement accuracy degradation does not exceed ±2% during high-field exposure, ensuring fault detection thresholds remain reliable in noisy automotive environments.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay Dale WSHM2818R0140FEA

Product Attribute
Part Number	WSHM2818R0180FEA	WSHM2818R0160FEA	WSHM2818R0130FEA	WSHM2818R0150FEA
Manufacturer	Vishay Dale	Vishay Dale	Vishay Dale	Vishay Dale
Number of Terminations	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Resistance	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Series	-	-	-	-
Composition	-	-	-	-
Temperature Coefficient	-	-	-	-
Failure Rate	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Ratings	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Size / Dimension	-	-	-	-
Power (Watts)	-	-	-	-
Height - Seated (Max)	-	-	-	-
Features	-	-	-	Simultaneous Sampling
Tolerance	-	-	-	-

WSHM2818R0140FEA Datasheet PDF

Download WSHM2818R0140FEA pdf datasheets and Vishay Dale documentation for WSHM2818R0140FEA - Vishay Dale.

Datasheets: WSHM2818 Series Prod Sheet.pdf WSHM2818.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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