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MT88L70AS1
Microchip Technology
IC TELECOM INTERFACE 18SOIC
12669 Pcs New Original In Stock
Telecom IC DTMF Receiver 18-SOIC
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Minimum 1
5.0 / 5.0
- (260 Ratings)
MT88L70AS1
Product Overview
1337709
DiGi Electronics Part Number
MT88L70AS1-DGManufacturer
Microchip Technology
MT88L70AS1
Description
IC TELECOM INTERFACE 18SOICInventory
12669 Pcs New Original In Stock
Telecom IC DTMF Receiver 18-SOIC
Quantity
Minimum 1
Minimum 1
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MT88L70AS1 Technical Specifications
Category
Interface, Telecom
Packaging
-
Series
-
Product Status
Active
Function
DTMF Receiver
Interface
-
Number of Circuits
1
Voltage - Supply
2.7V ~ 3.6V
Current - Supply
2mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
18-SOIC (0.295", 7.50mm Width)
Supplier Device Package
18-SOIC
Base Product Number
MT88L70
Datasheet & Documents
HTML Datasheet
MT88L70AS1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
40
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
합리적인 가격과 빠른 문제 해결력 덕분에 재구매 의사가 많아요.
de desembre 02, 2025
Ils offrent une gamme impressionnante, et leur traitement des commandes est toujours impeccable et rapide.
de desembre 02, 2025
長年お世話になっていますが、品質とサポートは常に一流です。
de desembre 02, 2025
My recent order arrived two days ahead of schedule, showcasing their efficient logistics.
de desembre 02, 2025
The post-purchase support was very professional and attentive to my needs.
de desembre 02, 2025
I find their pricing to be very competitive, especially given the premium packaging involved.
de desembre 02, 2025
The durability and performance of their products showcase their dedication to quality.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when integrating the MT88L70AS1 DTMF receiver into a low-voltage telecom system operating near 2.7V?
When integrating the MT88L70AS1 into systems operating at the lower edge of its 2.7V to 3.6V supply range, ensure voltage stability under load to avoid receiver sensitivity degradation or false tone detection. Voltage droop during peak current demands (e.g., RF transmission in handheld radios or base station peripherals) can push the supply below 2.7V, leading to latch-up or loss of decode accuracy. Use a low-dropout regulator with tight load regulation and add local decoupling (e.g., 1μF ceramic capacitor at the VDD pin) to mitigate transient drops. Also consider that DTMF signal decoding performance, especially under noisy line conditions, may degrade marginally at lower supply voltages due to reduced internal comparator headroom. Designers should validate decoding accuracy with real-world telephone line inputs across the full voltage and temperature range.
How does the MT88L70AS1 compare to the MT8870D in terms of design compatibility and reliability for legacy telecom upgrades?
While both MT88L70AS1 and MT8870D are DTMF receivers, the MT88L70AS1 operates at a lower voltage (2.7V–3.6V) compared to the 5V-only MT8870D, making it unsuitable for direct drop-in replacement without adjusting the power rail. However, the MT88L70AS1 improves power efficiency with only 2mA typical supply current, ideal for battery-powered or energy-conscious systems. For upgrading legacy 5V designs, maintain signal compatibility by using a level shifter on the data output lines and confirm that the MT88L70AS1’s CMOS input tolerance matches the incoming DTMF analog signal source. The MT88L70AS1 also offers better temperature resilience (−40°C to +85°C) and is RoHS3 compliant, enhancing long-term supply and reliability—critical for industrial or outdoor telecom gateways where thermal and compliance risks exist.
Can the MT88L70AS1 be used reliably in high-noise PBX or DSL co-located environments, and what PCB layout practices reduce false triggering?
The MT88L70AS1 can face decoding challenges in high-noise environments like PBX switches or DSL lines with crosstalk, due to its reliance on precise analog tone filtering. To reduce false triggering, implement guard bands in software by validating output codes over multiple consecutive frames before acting. On the PCB, minimize analog trace length from the preamp to the IN+ and IN− pins, shield the analog front-end, and use a solid ground plane underneath the 18-SOIC package. Route digital output lines (e.g., D0–D3, STQ) away from sensitive analog sections to prevent coupling. Additionally, filter the power rail with ferrite beads and ensure stable reference voltages by not sharing the analog ground with switching regulators. These steps maintain the MT88L70AS1’s intended signal-to-noise performance and decoding reliability.
What are the implications of using the MT88L70AS1 in a surface-mount reflow assembly process, considering its MSL 3 rating?
The MT88L70AS1’s Moisture Sensitivity Level 3 (168-hour floor life at ≤30°C/60% RH) requires careful handling during SMT assembly. If the device is stored outside a dry cabinet or sealed bag beyond 168 hours, it must be baked (typically 125°C for 8–24 hours) before reflow to prevent 'popcorning'—internal delamination caused by rapid moisture expansion. Use a profile compliant with JEDEC J-STD-020, limiting peak temperature to ≤260°C. Furthermore, verify stencil design for the 7.50mm-wide 18-SOIC package to prevent tombstoning; ensure even solder paste deposition and thermal balance on all pads. Post-reflow cleaning processes, if used, must be compatible with molded plastic packages to avoid chemical ingress or surface leakage affecting the MT88L70AS1’s high-impedance inputs.
Is the MT88L70AS1 a viable replacement for the QT/UM92870 in modern energy-efficient telemetry systems, and what trade-offs should be evaluated?
The MT88L70AS1 can serve as a modern, low-power alternative to aging DTMF receivers like the QT or UM92870 in telemetry or remote monitoring applications, but several trade-offs exist. Unlike the UM92870 (which typically runs on 5V), the MT88L70AS1 operates at 2.7V–3.6V, aligning better with 3.3V microcontrollers and reducing system power—ideal for remote solar or battery-operated RTUs. However, verify that the analog input drive requirements match; the MT88L70AS1 expects a different input amplitude range, so recalibrate the front-end gain. Also, confirm availability: while the MT88L70AS1 is active with 12,600 pcs in stock, the QT/UM92870 series are often obsolete. Designers must revalidate tone detection timing and ensure firmware expects the MT88L70AS1’s data output behavior (e.g., 3-state outputs, steering key delay) to avoid misinterpretation in legacy code bases.
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.
MT88L70AS1 CAD Models
Microchip Technology MT88L70AS1 PCB symbols & footprints
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