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KA393DTF
onsemi
IC COMPARATOR 2 GEN PUR 8SOIC
16777 Pcs New Original In Stock
Comparator General Purpose 8-SOIC
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (63 Ratings)
KA393DTF
Product Overview
7753035
DiGi Electronics Part Number
KA393DTF-DGManufacturer
onsemi
KA393DTF
Description
IC COMPARATOR 2 GEN PUR 8SOICInventory
16777 Pcs New Original In Stock
Comparator General Purpose 8-SOIC
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
How to Order
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KA393DTF Technical Specifications
Category
Linear, Comparators
Packaging
-
Series
-
Product Status
Obsolete
Type
General Purpose
Number of Elements
2
Output Type
-
Voltage - Supply, Single/Dual (±)
2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)
5mV @ 5V
Current - Input Bias (Max)
0.25µA @ 5V
Current - Output (Typ)
18mA @ 5V
Current - Quiescent (Max)
2.5mA
CMRR, PSRR (Typ)
-
Propagation Delay (Max)
-
Hysteresis
-
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC (0.154", 3.90mm Width)
Mounting Type
Surface Mount
Supplier Device Package
8-SOIC
Base Product Number
KA393
Datasheet & Documents
HTML Datasheet
KA393DTF-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
KA393DTFCT
KA393DTF-DG
2832-KA393DTFTR
KA393DTFTR
KA393DTFDKR
Standard Package
3,000
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
가격 경쟁력이 뛰어나서 항상 좋은 선택이 됩니다. 게다가 고객 서비스도 매우 신속하고 친절해서 믿고 구매할 수 있어요.
December 02, 2025
Je suis très satisfait de la durabilité et des coûts abordables de leurs produits.
December 02, 2025
繰り返し購入したいと思える信頼できるお店です。
December 02, 2025
Super fast shipping and sturdy packaging—very pleased.
December 02, 2025
Despite tight deadlines, DiGi Electronics ensures my orders are shipped swiftly.
December 02, 2025
Fast and dependable logistics at DiGi Electronics reduce logistical worries for clients.
December 02, 2025
Safe and secure packaging made me feel reassured about my purchase.
December 02, 2025
Orders arrive quickly, and the components have demonstrated excellent resilience after extended use.
December 02, 2025
With their speedy dispatch and tough products, I've experienced minimal failures.
December 02, 2025
Timely delivery helps us keep up with urgent repair requests without compromising quality.
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Frequently Asked Questions (FAQ)
Can the KA393DTF be safely replaced with an LM293ADR in a 5V single-supply industrial sensor interface, and what are the key risks to evaluate before making the swap?
While the LM293ADR is a functional substitute for the KA393DTF in many 5V applications, you must verify input common-mode range and output saturation voltage under your specific load conditions. The KA393DTF guarantees operation down to the negative rail (V−), and the LM293ADR also supports rail-to-rail input, but its output may not pull fully to ground under heavy loads—check VOL at your expected sink current. Additionally, confirm that your PCB layout accommodates the same 8-SOIC footprint and thermal profile. Since the KA393DTF is obsolete, sourcing risk is high; however, uncontrolled substitutions without validation can lead to marginal failures in production. Always test the LM293ADR across temperature (0°C to 70°C) and supply ripple conditions matching your end-use environment.
What design precautions are necessary when using the KA393DTF in a high-impedance battery monitoring circuit with 10MΩ divider resistors, given its input bias current specification?
The KA393DTF has a maximum input bias current of 0.25 µA at 5V, which can generate significant offset errors when paired with high-impedance sources like 10MΩ resistor dividers. For example, 0.25 µA through 10MΩ creates a 2.5V error—far exceeding the 5mV max input offset voltage. To mitigate this, either reduce divider impedance (e.g., use 100kΩ instead of 10MΩ and buffer with an op-amp), or add a balancing resistor from the non-inverting input to ground equal to the Thévenin equivalent of the divider. Also ensure PCB cleanliness and guard rings around high-impedance nodes to prevent leakage currents from exacerbating the issue. This is especially critical in low-power designs where leakage paths can dominate over the comparator’s own bias current.
Is it safe to operate the KA393DTF near its maximum supply voltage (36V single or ±18V dual) in an automotive environment with load-dump transients, and how should I protect it?
Operating the KA393DTF at or near its 36V absolute maximum rating in automotive systems is risky due to ISO 7637-2 load-dump pulses that can exceed 40V. Even brief overvoltage events may degrade the device over time or cause immediate failure. To safely use the KA393DTF in such environments, implement a TVS diode (e.g., SMAJ33A) on the supply rail clamped below 36V, along with a series current-limiting resistor and bulk capacitance. Alternatively, consider a regulated pre-stage to keep the comparator supply within a safer margin (e.g., 24–28V). Never rely solely on the KA393DTF’s absolute max ratings for continuous operation—design for derating and transient immunity to ensure long-term reliability.
How does the KA393DTF’s lack of internal hysteresis affect noise immunity in a zero-crossing detector for AC line sensing, and what external components are needed to stabilize it?
The KA393DTF has no internal hysteresis, making it prone to oscillation or false triggering when used in a zero-crossing detector exposed to EMI or slow-rising signals near the threshold. To ensure clean switching, add external positive feedback via a resistor network (e.g., 1MΩ from output to non-inverting input and 100kΩ from non-inverting input to ground) to create ~5–20mV of hysteresis, depending on your noise environment. Calculate hysteresis voltage as ΔV = (VOH − VOL) × (Rfeedback / (Rfeedback + Rto_ground)). Also include a small RC filter (e.g., 1kΩ + 10nF) at the input to attenuate high-frequency noise. Without these measures, the KA393DTF may produce multiple output transitions per zero-crossing, corrupting downstream logic or microcontrollers.
Given that the KA393DTF is obsolete, what long-term supply chain and reliability risks should I consider if continuing to use it in new designs, and which modern alternatives offer better lifecycle support?
Using the obsolete KA393DTF in new designs introduces significant lifecycle risks, including sudden last-time-buy notices, counterfeit parts, and lack of manufacturer support. Although substitutes like the LM2903DRG4 or BA2903YF-CE2 are electrically similar, they may come from suppliers with more stable roadmaps. Evaluate alternatives not just on specs but on manufacturer commitment—e.g., Texas Instruments and Rohm provide longer-term availability guarantees. If redesign isn’t immediately feasible, secure a multi-year inventory buffer and implement rigorous incoming inspection (X-ray, decapsulation) to detect fakes. For future-proofing, migrate to newer comparators with integrated features (e.g., built-in hysteresis, shutdown modes) that reduce BOM complexity and improve system reliability beyond what the KA393DTF can offer.
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.
KA393DTF CAD Models
onsemi KA393DTF PCB symbols & footprints
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