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Home Products Resistors Chip Resistor - Surface Mount~~SG73S2ARTTD12R1F~~

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SG73S2ARTTD12R1F - KOA Speer Electronics, Inc.

Name: KOA Speer Electronics, Inc. SG73S2ARTTD12R1F
Brand: KOA Speer Electronics, Inc.
SKU: SG73S2ARTTD12R1F
Price: 0.027 USD
Availability: InStock
Rating: 5 (9 reviews)

Manufacturer Part Number: SG73S2ARTTD12R1F

Manufacturer: KOA Speer Electronics, Inc.

Allelco Part Number: 98D-SG73S2ARTTD12R1F

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 44,105 pcs available, New & Original

Parts Description: RES 12.1 OHM 1% 1/4W 0805

Package: 0805

Data sheet: SG73S2ARTTD12R1.pdf

Datasheets
SG73S Type Datasheet.pdf

HTML Datasheet
SG73S Type Datasheet.pdf

RoHs Status: ROHS3 Compliant

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Specifications

SG73S2ARTTD12R1F Tech Specifications
KOA Speer Electronics, Inc. - SG73S2ARTTD12R1F technical specifications, attributes, parameters and parts with similar specifications to KOA Speer Electronics, Inc. - SG73S2ARTTD12R1F

Product Attribute	Attribute Value
Manufacturer	KOA Speer Electronics, Inc.
Tolerance	±1%
Temperature Coefficient	±200ppm/°C
Supplier Device Package	0805
Size / Dimension	0.079" L x 0.049" W (2.00mm x 1.25mm)
Series	SG73S-RT
Resistance	12.1 Ohms
Ratings	-
Power (Watts)	0.25W, 1/4W

Product Attribute	Attribute Value
Package / Case	0805 (2012 Metric)
Package	Tape & Reel (TR)
Operating Temperature	-55°C ~ 155°C
Number of Terminations	2
Height - Seated (Max)	0.024" (0.60mm)
Features	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant, Pulse Withstanding
Failure Rate	-
Composition	Thick Film

Environmental & Export Classifications

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

Frequently Asked Questions(FAQ)

What makes the SG73S2ARTTD12R1F suitable for automotive applications compared to standard 0805 resistors?: The SG73S2ARTTD12R1F is AEC-Q200 qualified, meaning it has passed automotive-grade reliability testing including thermal cycling, mechanical shock, and vibration stress. Beyond standard thick-film construction, this 12.1 ohm resistor incorporates anti-sulfur coating to prevent degradation in corrosive environments typical of engine compartments and underbody locations. The pulse withstanding capability ensures the SG73S2ARTTD12R1F can handle transient current spikes without performance drift, a critical requirement in automotive power distribution and sensor signal conditioning circuits where inductive load switching is common.

How does the ±1% tolerance of the SG73S2ARTTD12R1F affect precision current sensing and shunt applications?: In current-sensing circuits, the SG73S2ARTTD12R1F's ±1% tolerance directly impacts voltage drop measurement accuracy across the 12.1 ohm shunt path. For a 5A load, tolerance stack can produce ±0.005V variation in sensed voltage, translating to approximately ±2% current measurement uncertainty before considering amplifier and ADC errors. This makes the SG73S2ARTTD12R1F suitable for moderate-precision applications (battery management systems, motor control feedback) but requires additional calibration or higher-tolerance components if system-level accuracy below ±1% is needed. The tight tolerance eliminates costly hand-selection or burn-in matching procedures compared to standard ±5% parts.

What is the practical power dissipation limit when using the SG73S2ARTTD12R1F in PCB layouts without forced air cooling?: The SG73S2ARTTD12R1F is rated for 0.25W continuous power in free-air conditions, but actual sustained dissipation depends on PCB copper area and thermal coupling. With standard 1oz copper and moderate pad design (typical for automotive boards), sustained operation near 0.20W is realistic before junction temperature approaches the upper operating limit of 155°C. At 0.25W dissipation in a 12.1 ohm SG73S2ARTTD12R1F, current reaches approximately 1.43A; exceeding this in high-ambient environments (85–125°C underhood) risks thermal runaway and resistance drift. Designs requiring sustained power dissipation above 0.18W should verify thermal modeling or consider parallel SG73S2ARTTD12R1F units to distribute heat and improve reliability margin.

How does the ±200ppm/°C temperature coefficient of the SG73S2ARTTD12R1F impact circuit behavior across the automotive temperature range?: The SG73S2ARTTD12R1F exhibits resistance change of approximately 0.06 ohms (0.5%) across the full -55°C to 155°C automotive operating range due to its ±200ppm/°C coefficient. In a 5A current-sensing application, this produces ~0.3mV additional voltage variation across temperature, compounding the ±1% initial tolerance stack. For analog circuits with tight gain control or threshold detection, this temperature-dependent resistance drift can cause signal calibration shifts of 0.5–1% without compensation. Digital systems with ratiometric sensing or temperature-compensated amplifiers tolerate the SG73S2ARTTD12R1F drift well, but precision analog front-ends may require lookup-table correction or active temperature compensation to maintain system accuracy.

Why is the SG73S2ARTTD12R1F packaged as 0805 rather than smaller 0603 or larger 1206 for 12.1 ohm shunt applications?: The 0805 form factor of the SG73S2ARTTD12R1F represents an engineering balance: the footprint is small enough for high-density automotive PCBs (engine control modules, battery management units) while providing sufficient thermal mass and copper coupling area to reliably dissipate 0.25W without extreme junction temperatures. Smaller 0603 versions would require parallel configurations or reduced current ratings to meet automotive thermal and reliability standards. Larger 1206 packages are unnecessary for 12.1 ohms at 0.25W and would waste PCB space in cost-sensitive automotive production. The SG73S2ARTTD12R1F's 0805 selection optimizes the power-dissipation-to-size ratio for typical automotive current-sensing and low-impedance load circuits.

How do the anti-sulfur and moisture-resistant properties of the SG73S2ARTTD12R1F compare to standard thick-film 0805 resistors in harsh environments?: Standard thick-film resistors can degrade within 2–5 years in high-humidity, high-sulfur environments (coastal or industrial areas) due to sulfide corrosion and moisture ingress at terminations. The SG73S2ARTTD12R1F's anti-sulfur coating and moisture-resistant design extend operational life to 10+ years under equivalent conditions. MSL-1 rating means the SG73S2ARTTD12R1F absorbs negligible moisture and requires no dry-pack handling, simplifying supply chain logistics. In underhood engine compartments where condensation, salt spray, and SOx exposure are routine, the SG73S2ARTTD12R1F maintains stable 12.1 ohm resistance while uncoated alternatives may drift by 5–15%, leading to sensor calibration errors and potential system faults.

What is the actual saturation or failure mode when the SG73S2ARTTD12R1F exceeds its rated power dissipation in a thermal cycling environment?: Continuous operation of the SG73S2ARTTD12R1F above 0.25W causes junction temperature rise; combined with automotive thermal cycling (-40°C to 125°C daily), thermal stress accelerates grain-boundary failure within the thick-film resistive element. Failure typically manifests as a slow resistance increase (drift >5% over weeks) rather than catastrophic open-circuit, making intermittent faults difficult to diagnose. The SG73S2ARTTD12R1F's pulse-withstanding capability mitigates transient overstress, but sustained overpowering leads to permanent degradation. Modern automotive power-distribution and current-sensing designs include thermostat-based shutdown or current limiting to prevent continuous SG73S2ARTTD12R1F overload; testing reveals that properly heatsunk or current-limited designs achieve >500k hour MTBF even at elevated ambient.

Can the SG73S2ARTTD12R1F be used in series or parallel configurations to achieve different resistance values while maintaining AEC-Q200 qualification?: Parallel SG73S2ARTTD12R1F units effectively divide resistance and sum power ratings, making dual-parallel configurations a standard approach to achieve ~6 ohms at 0.5W total for high-current sensing. Series configurations increase total resistance but offer no thermal or reliability advantage over single larger-value parts. Parallel SG73S2ARTTD12R1F designs maintain AEC-Q200 compliance only if PCB layout ensures balanced current distribution and matched thermal environments; unbalanced parasitics or thermal coupling can cause current concentration in one SG73S2ARTTD12R1F, exceeding its 0.25W rating and voiding qualification. Manufacturing processes for parallel SG73S2ARTTD12R1F arrays typically include 0603 balancing resistors on each leg to enforce current sharing and simplify system integration.

How should the SG73S2ARTTD12R1F be specified in thermal derating curves and power budget calculations for long-haul automotive mission profiles?: OEM thermal models for the SG73S2ARTTD12R1F assume free-air convection and use a derating curve that typically reduces allowable power to ~0.15W at 85°C ambient and ~0.10W at 125°C ambient. Long-haul automotive missions (trucks, buses) experience sustained 100+ °C underhood temperatures, requiring engineers to derate the SG73S2ARTTD12R1F power budget conservatively. A practical design rule treats the SG73S2ARTTD12R1F as 0.15W-rated above 60°C ambient, forcing parallel configurations or reduced current for designs requiring sustained power near nominal 0.25W spec. Mission-profile analysis should integrate the SG73S2ARTTD12R1F into system power budgets as a thermal bottleneck; suppliers typically provide derating tables, but field experience shows 20–30% margin is prudent for reliability and long-term drift control.

What is the typical cost and lead-time implication of specifying the SG73S2ARTTD12R1F versus non-AEC-Q200 alternatives?: AEC-Q200 qualification of the SG73S2ARTTD12R1F introduces manufacturing and testing overhead; typical pricing is 2–4× higher than unqualified 0805 12.1 ohm resistors from commodity suppliers. Lead times for SG73S2ARTTD12R1F can extend 8–16 weeks during supply constraints, whereas standard parts may be available from stock. However, automotive OEM design-in cycles mandate AEC-Q200 for underhood and safety-critical circuits; omitting the SG73S2ARTTD12R1F or substituting non-qualified parts voids module qualification and creates warranty exposure. Bulk procurement (100k+ reels) improves SG73S2ARTTD12R1F unit pricing to near parity with premium unqualified brands, and long-term supply agreements reduce lead-time risk. Total cost-of-ownership typically favors the SG73S2ARTTD12R1F over rework and field-failure cycles introduced by non-qualified alternatives.

How does RoHS3 compliance of the SG73S2ARTTD12R1F affect PCB assembly and solder reflow compatibility?: RoHS3 compliance means the SG73S2ARTTD12R1F contains no lead, cadmium, or other restricted substances, requiring lead-free solder (typically SAC305) and elevated reflow temperatures (240–260°C peak versus 210–230°C for leaded processes). The SG73S2ARTTD12R1F's thick-film construction and 0805 footprint handle lead-free reflow well, with no special process modifications needed. However, suppliers must confirm the SG73S2ARTTD12R1F is compatible with customer-specific reflow profiles; some automotive OEMs use selective or wave-solder processes for underbody applications where the SG73S2ARTTD12R1F's small lead geometry can trap flux residue. PCB assembly integration treats the SG73S2ARTTD12R1F identically to standard resistors, but traceability documentation for RoHS3 declarations should be archived per automotive data-retention standards.

What test criteria and acceptance limits apply to the SG73S2ARTTD12R1F during manufacturing quality verification?: AEC-Q200 production testing of the SG73S2ARTTD12R1F includes electrical characterization (resistance measurement within ±1%), temperature-coefficient validation across the -55–155°C range, and moisture absorption testing per IPC-TM-650 2.6.3. Pulse-withstanding tests apply peak currents (~10A at 1s pulse width) to verify the SG73S2ARTTD12R1F resists transient overstress without permanent drift exceeding ±2%. Supplier datasheets typically reference AEC-Q200 compliance but do not detail acceptance criteria; customers requiring validation should request test reports or witness production audits. The SG73S2ARTTD12R1F's anti-sulfur coating is verified via salt-spray testing (ASTM B117) for 1000+ hours with resistance drift <2%, confirming long-term environmental durability. Incoming inspection at OEM facilities often includes resistance trending and temperature-coefficient spot-checks to detect manufacturing anomalies before assembly.

Parts with Similar Specifications

The three parts on the right have similar specifications to KOA Speer Electronics, Inc. SG73S2ARTTD12R1F

Product Attribute
Part Number	SG73S2ARTTD12R4F	SG73S2ARTTD1271F	SG73S2ARTTD12R7F	SG73S2ARTTD12R0F
Manufacturer	KOA Speer Electronics, Inc.	KOA Speer Electronics, Inc.	KOA Speer Electronics, Inc.	KOA Speer Electronics, Inc.
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Tolerance	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Temperature Coefficient	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Height - Seated (Max)	-	-	-	-
Features	-	-	-	Simultaneous Sampling
Ratings	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Power (Watts)	-	-	-	-
Series	-	-	-	-
Failure Rate	-	-	-	-
Size / Dimension	-	-	-	-
Resistance	-	-	-	-
Number of Terminations	-	-	-	-
Composition	-	-	-	-

SG73S2ARTTD12R1F Datasheet PDF

Download SG73S2ARTTD12R1F pdf datasheets and KOA Speer Electronics, Inc. documentation for SG73S2ARTTD12R1F - KOA Speer Electronics, Inc..

Datasheets: SG73S Type Datasheet.pdf
HTML Datasheet: SG73S Type Datasheet.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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