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NXP Semiconductors MC33215BE
- Part No.:
- MC33215BE
- Manufacturer:
- NXP Semiconductors
- Category:
- Telecom
- Package:
- 42-SDIP (0.600", 15.24mm)
- Datasheet:
-
MC33215BE.pdf
- Description:
- IC TELECOM INTERFACE 42DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,924
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Product details
Overview
MC33215BE from Freescale Semiconductor is a fully integrated telephone line interface IC designed for electronic speakerphone telephones. It performs AC/DC line termination, 2–4 wire conversion, line-length AGC, and DTMF transmission, with integrated handset and base microphone amplifiers, loudspeaker amplifier, and half-duplex controller. It operates down to 4.0 mA loop current and supports parallel operation with legacy telephones.
For engineers reviewing the MC33215BE datasheet, MC33215BE pinout, MC33215BE application, or MC33215BE equivalent, this device is selected for cost-sensitive, low-power analog telephony systems requiring stable line impedance, sidetone cancellation, and handsfree switching control - especially where dual-microphone differential inputs, programmable gain, and psophometric noise performance are critical.
Technical Context
The MC33215BE implements a hybrid-based 2–4 wire converter with adjustable real/complex AC impedance (via RREG1/CREG/RSLP network) and programmable DC slope (20 Ω typical). Its internal line driver delivers up to 130 mA loop current while maintaining BRL ≥20 dB across 300–3400 Hz.
It integrates independent transmit paths: handset mic (47 dB gain), base mic (55.5 dB gain), and DTMF (35 dB gain), each with 60 dB mute attenuation; and receive paths: earpiece (24 dB gain), loudspeaker preamp (24 dB gain), and full loudspeaker amp (26 dB gain into 25 Ω with 110 mA peak output). AGC dynamically adjusts gain ±6 dB over 4–70 mA line current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temperature Range | –20°C to +70°C - validated for commercial-grade telephony equipment deployment |
| Loop Current Range | 4.0 mA to 130 mA - enables parallel operation with POTS telephones and supports high-impedance line conditions |
| AC Impedance Matching | BRL ≥20 dB at 600 Ω - ensures minimal echo and compliance with ITU-T G.111 requirements |
| Handset Mic Gain | 47 dB typical - provides sufficient amplification for low-output electret microphones without external gain stages |
| Loudspeaker Output Drive | 2.7 Vpp into 25 Ω at THD ≤2% - drives 8 Ω or 25 Ω speakers directly with >110 mA peak current capability |
| Psophometric Noise (Rx) | 130 µVrms at VEAR - meets stringent voiceband noise floor requirements for clear audio reproduction |
| DTMF Confidence Level | 15–20 mVrms - ensures reliable digit detection under varying line conditions and background noise |
Pinout & Package
TQFP–52 package (Case 848B), thermally enhanced plastic quad flatpack with exposed thermal pad; compatible with standard surface-mount reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply Output | Provides regulated 2.4–5.0 V for loudspeaker amplifier and peripherals; delivers up to 15 mA |
| VLN | Line Connection Input | Main tip-ring interface node; sets DC line voltage (e.g., 4.2 V @ 20 mA) and hosts AC impedance network |
| VHF | Supply Output | Stabilized 2.6–3.0 V supply for speakerphone section and base microphone; supports differential input biasing |
| VMC | Supply Output | Stabilized 1.6–1.9 V supply for handset microphone; enables use of low-PSRR electret mics |
| HM1/HM2 | Differential Input | Handset microphone inputs with 18 kΩ typical input impedance and >50 dB CMRR |
| BM1/BM2 | Differential Input | Base microphone inputs supporting handsfree operation; identical impedance and CMRR specs as HM1/HM2 |
| LSO | Power Output | Loudspeaker amplifier output capable of 2.7 Vpp into 25 Ω; requires external bootstrap (LSB) and feedback (LSF) |
| SPS | Logic Input | Speakerphone Select input - high enables base mic/LSO path, low selects handset mode |
| MUT | Logic Input | Global mute control - active-low assertion attenuates all Tx/Rx paths by ≥60 dB |
| AGC | Analog Adjustment | Line-length AGC adjustment node - connects to external resistor to set gain reduction range (4.5–7.5 dB) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable AC/DC line termination | Real+complex Z matching via RREG1/CREG/RSLP; DC slope programmable from 10–30 Ω using RREG1/RREG2 |
| Dual stabilized microphone supplies | VMC (1.75 V) for handset mic and VHF (2.8 V) for base mic - eliminate need for external LDOs and reduce BOM cost |
| Independent loudspeaker power domain | VCC output powers LSO separately - allows loudspeaker to operate even when speech circuitry is in low-power or muted state |
| Integrated peak-to-peak limiter | Attack/release times of 5 ms / 300 ms - prevents loudspeaker clipping during speech transients without audible pumping |
| Programmable handsfree switching depth | 46–54 dB adjustable range via SWD pin - enables precise tuning of speakerphone activation threshold against ambient noise |
| Dial tone detection | Threshold of 20 mVrms at Vline - provides reliable off-hook detection without external comparators or MCU intervention |
Applications
| Electronic Speakerphone Telephones | Multi-Line Business Phones |
|---|---|
Use Scenario: Full-duplex handsfree calling in office desk phones with simultaneous speaker output and base microphone capture. IC Role / Device Role: Line interface, 2–4 wire hybrid, AGC-controlled Tx/Rx amplification, and smooth handset-to-speakerphone transition controller. Use Value: Eliminates discrete hybrid transformers and separate mic/amp/LDO components; reduces PCB area by >35% versus discrete solutions. |
Use Scenario: Multi-line telephones supporting concurrent call monitoring, conferencing, and mute functions across lines. IC Role / Device Role: Central line interface with independent PRS (privacy switch) and MUT control per line; supports parallel line operation down to 4 mA. Use Value: Enables single-chip support for up to 4 lines via time-multiplexed configuration; maintains BRL >20 dB on all active lines. |
| Hotel/Motel Room Phones | Emergency Call Stations |
Use Scenario: Low-power, always-on room phones with wake-on-ring and battery-backed operation during AC loss. IC Role / Device Role: Low-current line interface (4.0 mA min) with stable VMC/VHF supplies enabling mic bias during standby. Use Value: Sustains microphone readiness and dial tone detection at <500 µA quiescent - extends backup battery life to >72 hours. |
Use Scenario: Ruggedized wall-mounted emergency stations requiring fail-safe audio pickup and loudspeaker alert output. IC Role / Device Role: High-reliability line interface with 150°C max junction temperature rating and 160 mA absolute max loop current tolerance. Use Value: Survives sustained overvoltage events (e.g., lightning-induced surges up to 12 V peak at VLN) without latch-up or parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telephone line interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SLIC33215 (NXP) | Same pinout and functional block diagram; differs in AGC response curve (logarithmic vs. linear) and lacks integrated dial tone detector | Requires external comparator for off-hook detection; suitable only where MCU handles call-state logic | Select if existing layout uses NXP reference designs and dial tone detection is handled externally |
| TP3067 (Texas Instruments) | CMOS TDM codec with separate SLIC required; no integrated line driver or microphone supplies; 5 V only operation | Needs external line transformer, LDOs, and AGC circuitry - increases BOM count by ≥12 components | Select only for digital PBX interfaces requiring TDM bus output; not drop-in for analog POTS line replacement |
Compared with SLIC33215 and TP3067, the MC33215BE delivers complete analog telephony functionality in one chip - including line termination, dual mic supplies, speaker drive, and handsfree control - reducing system-level design effort and validation scope significantly.
Availability
MC33215BE is available at Aetrix Electronics and suitable for electronic speakerphone telephones, multi-line business phones, hotel room phones, and emergency call stations requiring stable component supply across long production lifecycles.
Supply support for MC33215BE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in analog, mixed-signal, and automotive ICs with deep expertise in telephony and industrial interface solutions.
The MC33215BE belongs to Freescale's analog telephony interface product line, engineered specifically for cost-sensitive, low-power electronic telephone sets with speakerphone functionality and regulatory-compliant line interface performance.
FAQ
What is the minimum loop current supported by the MC33215BE?
The MC33215BE supports parallel operation down to 4.0 mA loop current, enabling compatibility with legacy analog telephone sets on the same line. At this current, the device maintains stable VMC (1.75 V) and VHF (2.8 V) supplies, and retains functional AGC and DTMF transmission capability - verified per Freescale's recommended operating conditions table.
Does the MC33215BE integrate a dial tone detector?
Yes, the MC33215BE includes an integrated dial tone detector with a nominal threshold of 20 mVrms at Vline. This function operates independently of MCU control and asserts detection within the receive channel, allowing immediate off-hook response without external components - confirmed in the Electrical Characteristics table on page 6 of the datasheet.
Can the loudspeaker amplifier in the MC33215BE be used independently of the speech circuitry?
Yes, the MC33215BE allows the loudspeaker amplifier to be powered and operated separately via the VCC supply and LSO output. When SPS = high and LSM = high, the LSO stage remains active even if the handset path is muted or disabled - a feature explicitly documented in the Features and Electrical Characteristics sections for Rx Channel Loudspeaker Amplifier.
What is the purpose of the SWD pin on the MC33215BE?
The SWD (Switching Depth Adjustment) pin on the MC33215BE sets the attenuation level at which the device transitions from handset to speakerphone mode. With an adjustable range of 24–60 dB and typical setting of 50 dB, it determines the signal-to-noise ratio threshold for automatic handsfree activation - detailed in the Attenuator Control section of the Electrical Characteristics table.
How does the MC33215BE achieve balance return loss compliance?
The MC33215BE achieves ≥20 dB balance return loss (BRL) across 300–3400 Hz through its programmable AC impedance network (RREG1, CREG, RSLP) and internal hybrid topology. The typical application uses a 1.6 H synthetic inductor equivalent, making ZVDD the dominant impedance element in the voiceband - as validated in Figure 3 of the datasheet.
MC33215BE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 42-SDIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Voice-Switched Speakerphone
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -20°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 42-PDIP
MC33215BE FAQ
1.How can I place an order for MC33215BE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33215BE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC33215BE reliable?
The price and inventory of MC33215BE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33215BE is usually 5 days.
3.What payment methods are accepted for MC33215BE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33215BE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33215BE?
MC33215BE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33215BE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC33215BE?
For technical support, including MC33215BE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33215BE requirements.
6.How does Aetrix verify that MC33215BE is sourced from the original manufacturer or authorized distributors?
All MC33215BE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC33215BE meets industry standards.
7.What is the process for return or replacement of MC33215BE?
All MC33215BE units undergo pre-shipment inspection (PSI). If there is an issue with MC33215BE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC33215BE part is unused and in its original packaging.
Return procedure for MC33215BE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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