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LM4140ACM-1.2
Texas Instruments
IC VREF SERIES 0.1% 8SOIC
1610 Pcs New Original In Stock
Series Voltage Reference IC Fixed 1.25V V ±0.1% 8 mA 8-SOIC
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5.0 / 5.0
- (320 Ratings)
LM4140ACM-1.2
Product Overview
1369829
DiGi Electronics Part Number
LM4140ACM-1.2-DGManufacturer
Texas Instruments
LM4140ACM-1.2
Description
IC VREF SERIES 0.1% 8SOICInventory
1610 Pcs New Original In Stock
Series Voltage Reference IC Fixed 1.25V V ±0.1% 8 mA 8-SOIC
Quantity
Minimum 1
Minimum 1
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LM4140ACM-1.2 Technical Specifications
Category
Power Management (PMIC), Voltage Reference
Packaging
-
Series
-
Product Status
Obsolete
Reference Type
Series
Output Type
Fixed
Voltage - Output (Min/Fixed)
1.25V
Current - Output
8 mA
Tolerance
±0.1%
Temperature Coefficient
3ppm/°C
Noise - 0.1Hz to 10Hz
2.2µVp-p
Noise - 10Hz to 10kHz
-
Voltage - Input
1.8V ~ 5.5V
Current - Supply
375µA
Operating Temperature
0°C ~ 70°C (TA)
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Base Product Number
LM4140
Datasheet & Documents
HTML Datasheet
LM4140ACM-1.2-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
95
Alternative Parts
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MANUFACTURER
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SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
고객을 위한 친환경 포장과 빠른 배송이 인상적이에요. 지속적으로 이용하고 싶어요.
de desembre 02, 2025
DiGi Electronics的物流公司運送非常迅速，包裝細心，讓我用得很放心。
de desembre 02, 2025
発送の速さとアフターサービスの良さに感銘を受けました。
de desembre 02, 2025
The shipping process was impressively timely, ensuring I received my order exactly when I needed it.
de desembre 02, 2025
The after-sales support from DiGi Electronics makes me feel valued as a customer.
de desembre 02, 2025
I am always impressed by how quickly they follow up after a sale.
de desembre 02, 2025
Their commitment to customer satisfaction is evident through their quick after-sales responses.
de desembre 02, 2025
Excellent responsiveness from their support team enhances our experience.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LM4140ACM-1.2 in new precision analog circuits given its obsolete status?
Using the LM4140ACM-1.2 in new designs carries significant long-term supply chain risk due to its obsolete status. While current inventory exists, future production is not guaranteed, which can jeopardize product scalability and lifecycle support. For precision applications requiring the LM4140ACM-1.2’s 0.1% initial accuracy and 3ppm/°C temperature coefficient, designers should immediately evaluate last-time buy options and identify drop-in replacements like the LM4140ACM-1.2/NOPB (if available) or consider upgrading to active alternatives such as the REF5012 or LTZ1000A with similar performance. Include obsolescence mitigation in your BOM review process to avoid costly redesigns.
Can the LM4140ACM-1.2 reliably drive a 5 kΩ load in a 16-bit DAC reference circuit, and what headroom margin should be maintained?
Yes, the LM4140ACM-1.2 can drive a 5 kΩ load, as this draws only 250 µA (1.25V / 5kΩ), well below its 8 mA maximum output current. However, to ensure stability and accuracy, especially at the limits of the 0°C to 70°C operating range, maintain at least 0.5V of headroom between the input supply and the output voltage. Since the LM4140ACM-1.2 requires a minimum 1.8V supply, use a regulated 2.5V or 3.3V rail in your design. For 16-bit systems where drift and noise affect performance, also decouple the reference output with a low-ESR 1 µF ceramic capacitor to minimize transient errors.
How does the lack of 10Hz to 10kHz noise specification in the LM4140ACM-1.2 datasheet impact high-resolution ADC designs?
The absence of a specified 10Hz to 10kHz noise value for the LM4140ACM-1.2 introduces uncertainty in signal-to-noise ratio (SNR) calculations for high-resolution ADCs, especially those operating in noisy industrial environments. While the 0.1Hz to 10Hz noise is specified at 2.2µVp-p—suitable for low-frequency precision—engineers must assume potential unmodeled broadband noise. To mitigate risk, treat the LM4140ACM-1.2 as more suited for DC or low-speed measurements (<100 Hz). For faster ADCs (e.g., 18-bit SAR), consider adding a 10 µF ceramic capacitor at the output and a low-pass RC filter (e.g., 10 Ω + 1 µF) to suppress high-frequency interference and improve effective resolution.
Is the LM4140ACM-1.2 pin- and performance-compatible with the MAX6325AESA+T, and what are the trade-offs in a drop-in replacement scenario?
The LM4140ACM-1.2 and MAX6325AESA+T are not pin-compatible—the former uses an 8-SOIC package while the MAX6325 uses 8-µMAX, requiring PCB modifications. Performance-wise, the MAX6325 offers superior 2ppm/°C temperature coefficient and similar 0.1% accuracy but at a higher cost and only 5 mA output current. Replacing the LM4140ACM-1.2 with the MAX6325AESA+T adds board complexity and cost. A better direct upgrade path may be the REF5012 (12ppm/°C, 0.1% tol, 10 mA out, 8-SOIC) if space and performance trade-offs allow, though recalibration may be needed due to slight differences in aging and noise behavior over time.
What reliability concerns should be considered when using the LM4140ACM-1.2 in industrial temperature environments despite its 0°C to 70°C rating?
Operating the LM4140ACM-1.2 in industrial environments—even if ambient temperatures nominally stay above 0°C—risks performance degradation during cold starts or in unheated enclosures. The device is not characterized below 0°C, so output voltage drift and startup behavior become unpredictable. For such applications, derating is essential: ensure the local PCB temperature remains above 10°C via thermal design or external heating. For designs targeting extended temperature ranges, consider active alternatives like the REF5012 or ADR4512, which are specified from -40°C to +125°C and maintain better long-term stability and lower noise in harsh conditions.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM4140ACM-1.2 CAD Models
Texas Instruments LM4140ACM-1.2 PCB symbols & footprints
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