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NXP Semiconductors MC34017A-1P
- Part No.:
- MC34017A-1P
- Manufacturer:
- NXP Semiconductors
- Category:
- Telecom
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MC34017A-1P.pdf
- Description:
- IC TELECOM INTERFACE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,165
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Product details
Overview
MC34017A-1P from Freescale Semiconductor is a bipolar linear telephone tone ringer IC with integrated diode bridge, transient protection, and push-pull piezoelectric driver. It delivers 1.0 kHz high-tone / 800 Hz low-tone output with 12.5 Hz warble rate, 37 VPP output swing, and meets Class A/B ringer equivalence standards for PSTN line interface applications.
For engineers reviewing the MC34017A-1P datasheet, MC34017A-1P pinout, MC34017A-1P application, or MC34017A-1P equivalent, this page provides verified terminal functions, oscillator configuration (RC = 1.0 kHz variant), ringing start/stop thresholds (36 VRMS/21 VRMS), input impedance signature compliance, and direct-drive capability for piezo transducers without external amplification.
Technical Context
The MC34017A-1P implements a relaxation oscillator controlled by external R2/C2 components to generate a base frequency of 4.0 kHz, which is divided internally to produce alternating 800 Hz and 1000 Hz tones at RO1/RO2 outputs. Its threshold detection circuit monitors rectified line current via RS terminal with 1.2 V trip point and 1.5 V clamp, rejecting rotary dial transients through C3 filtering.
Power is derived directly from the AC ringing signal via on-chip diode bridge (AC1/AC2) and shunt regulator (RI/RG), limiting RI voltage to ~22 V while triggering an internal SCR above 50 mA to divert transient energy. The push-pull output stage sustains ±20 mA drive into piezo loads with 50% duty cycle and no external biasing required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Tone Frequencies | High tone: 1010 Hz; low tone: 808 Hz; warble rate: 12.5 Hz - enables standard telephone audible alert with pitch variation to distinguish ring events. |
| Ringing Start Voltage | 36 VRMS at 20 Hz - ensures reliable activation under nominal PSTN ringing conditions while avoiding false triggers from noise. |
| Ringing Stop Voltage | 21 VRMS at 20 Hz - provides clean turn-off hysteresis to prevent oscillation near threshold during decaying ring signals. |
| Output Voltage Swing | 37 VPP at VI ≥ 60 VRMS - sufficient to drive standard piezoceramic transducers to audible SPL without external boost stages. |
| Input Impedance Signature | Class A (0.5 kΩ) and Class B (0.9 kΩ) compliant - satisfies EIA/TIA-968 and Bellcore TR-NWT-000009 requirements for ringer equivalence testing. |
| Maximum Transient Input | 1500 V peak (T ≤ 2.0 ms) - withstands lightning-induced surges and inductive kickback without external TVS diodes. |
Pinout & Package
MC34017A-1P is housed in an 8-lead plastic DIP package (P suffix, 98A42420B), with 0.3 inch body width and standard through-hole mounting. Pin 7 (RG) serves as common ground reference for diode bridge and internal circuitry; pins 1 and 8 form full-wave AC input terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AC1, AC2 (1, 8) | Full-wave diode bridge inputs | Accepts AC ringing signal directly from telephone line; internal bridge rectifies to power internal circuits and enable detection. |
| RS (5) | Threshold comparator input | Senses mirrored diode bridge current via external R3; trips at 1.2 V with 1.5 V internal clamp to reject dial pulses. |
| RI (4) | Positive supply rail | DC output of internal shunt regulator (~22 V); powers oscillator, dividers, and output buffer - no external supply needed. |
| RO1, RO2 (2, 3) | Tone ringer outputs | Push-pull complementary outputs driving piezo element differentially; deliver 37 VPP, ±20 mA, 50% duty cycle square wave. |
| RG (7) | Negative supply / bridge return | Common reference for all internal circuits and diode bridge cathode; must be connected to system ground. |
| RC (6) | Oscillator timing node | Connects external R2/C2 to set base oscillator frequency (4.0 kHz for -1P variant); determines tone and warble frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated diode bridge + SCR protection | Eliminates need for 6–8 discrete diodes and external surge suppressors; handles ±300 mA transient peaks and 1500 V line spikes. |
| Self-powered operation | Derives all operating power from AC ringing signal - no external DC supply or charge pump required for basic functionality. |
| Programmable tone/warble via RC network | Single R2/C2 pair sets oscillator frequency; tone ratios (fO/4, fO/5) and warble (fO/320) are fixed by internal divider architecture. |
| Direct piezo drive | Push-pull output stage delivers 37 VPP into capacitive piezo loads without coupling transformers or level-shifting circuitry. |
| Bell-equivalent impedance signature | Meets Class A (0.5 kΩ) and Class B (0.9 kΩ) requirements per EIA/TIA-968 - passes regulatory ringer equivalence tests without calibration. |
Applications
| Home Telephone Handsets | VoIP Analog Telephone Adapters (ATAs) |
|---|---|
|
Use Scenario: Ring indication in corded/cordless home telephones connected to POTS lines. IC Role / Device Role / Timing Role: Primary ringer IC generating audible alert tones from line-derived power. Use Value: Eliminates electromechanical bell and external transformer; reduces BOM count by 12+ components while meeting FCC Part 68 ringer equivalence. |
Use Scenario: Providing PSTN-compatible ring signal generation in VoIP gateways converting SIP/RTP to analog FXS ports. IC Role / Device Role / Timing Role: Line-powered tone generator interfacing between isolated DC-powered VoIP controller and telephone line. Use Value: Enables regulatory-compliant ring detection and audio output without separate AC line interface IC or isolated DC-DC converter. |
| Hotel/Multi-line Phone Systems | Emergency Alert Devices |
|
Use Scenario: Centralized ring distribution across multiple extensions using shared line voltage. IC Role / Device Role / Timing Role: Standalone ringer per extension, powered and triggered by common ringing bus. Use Value: Supports parallel connection of up to 5 MC34017A-1P units on single line with stable impedance loading per EIA-968 Class B. |
Use Scenario: Audible alert generation in battery-backed emergency phones or nurse call systems requiring fail-safe ring function. IC Role / Device Role / Timing Role: Low-power, line-triggered tone source activated only during AC ring event - zero standby current draw. Use Value: Extends backup battery life by eliminating always-on oscillator; activates only when line voltage exceeds 36 VRMS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telephone tone ringer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SL13010D | CMOS-based; requires external DC supply (3–5 V); lower quiescent current but no line-powered operation. | Lacks integrated diode bridge and SCR protection; needs external surge suppression and rectification. | Select when system already provides regulated DC and space constraints favor SOIC-8 over DIP-8. |
| MAX6326 | Microprocessor supervisory IC with reset function; no tone generation capability - not a functional substitute. | Designed for power monitoring, not ringer applications; cannot replace MC34017A-1P in telephone systems. | Not recommended as alternative; included only due to historical cross-reference mislabeling in some distributor catalogs. |
Compared with SL13010D and MAX6326, the MC34017A-1P uniquely combines line-powered operation, integrated protection, and Class A/B compliance in a single DIP-8 package - making it irreplaceable for cost-sensitive, regulatory-certified PSTN ringer designs where external power is unavailable.
Availability
MC34017A-1P is available at Aetrix Electronics and suitable for home telephone handsets, VoIP analog telephone adapters (ATAs), and hotel multi-line phone systems requiring stable component supply and long-term lifecycle support.
Supply support for MC34017A-1P 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 was a leading designer of analog, mixed-signal, and embedded processing solutions, later acquired by NXP Semiconductors in 2015.
The MC34017A-1P belongs to Freescale's legacy telephone interface IC product line, engineered specifically for PSTN ringer replacement with self-powered operation and regulatory compliance.
FAQ
What is the base oscillator frequency used by the MC34017A-1P to generate its 1.0 kHz tone?
The MC34017A-1P uses a 4.0 kHz base oscillator frequency set by external R2 and C2 components on the RC terminal. This frequency is divided internally to produce the 1010 Hz high tone and 808 Hz low tone outputs. The warble rate of 12.5 Hz results from fO/320 division, confirming the oscillator must be precisely 4.0 kHz for correct MC34017A-1P operation.
Does the MC34017A-1P require an external DC power supply?
No, the MC34017A-1P derives all operating power from the AC ringing signal applied to AC1 and AC2 terminals. An internal diode bridge rectifies the line voltage, and a shunt regulator maintains ~22 V at the RI terminal to power the oscillator, dividers, and output stage - eliminating need for external DC supply in MC34017A-1P designs.
How does the MC34017A-1P reject rotary dial transients?
The MC34017A-1P rejects rotary dial transients via RC filtering at the RS terminal: capacitor C3 filters the voltage across sense resistor R3, preventing rapid voltage spikes from reaching the 1.2 V threshold comparator. This design ensures only sustained ringing signals exceeding 36 VRMS activate the MC34017A-1P output stage.
What is the maximum AC input voltage the MC34017A-1P can withstand?
The MC34017A-1P supports a maximum AC input voltage of 150 VRMS at frequencies ≤ 68 Hz, and withstands transient peaks up to 1500 V for durations ≤ 2.0 ms. These ratings are validated per Freescale's Maximum Ratings table and allow safe operation on global PSTN lines including high-voltage European ringing standards.
Can the MC34017A-1P drive electromagnetic speakers or only piezoelectric transducers?
The MC34017A-1P is optimized for direct drive of piezoelectric transducers, delivering 37 VPP square wave output with ±20 mA capability. Its push-pull stage lacks current-limiting or thermal protection for low-impedance electromagnetic speakers (typically 8 Ω), so driving such loads risks device damage and is not supported in MC34017A-1P applications.
MC34017A-1P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Tone Ringer
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- 5V
- Current - Supply:
- 20mA
- Power (Watts):
- 1 W
- Operating Temperature:
- -20°C ~ 60°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MC34017A-1P FAQ
1.How can I place an order for MC34017A-1P through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34017A-1P 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 MC34017A-1P reliable?
The price and inventory of MC34017A-1P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34017A-1P is usually 5 days.
3.What payment methods are accepted for MC34017A-1P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34017A-1P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34017A-1P?
MC34017A-1P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34017A-1P 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 MC34017A-1P?
For technical support, including MC34017A-1P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34017A-1P requirements.
6.How does Aetrix verify that MC34017A-1P is sourced from the original manufacturer or authorized distributors?
All MC34017A-1P 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 MC34017A-1P meets industry standards.
7.What is the process for return or replacement of MC34017A-1P?
All MC34017A-1P units undergo pre-shipment inspection (PSI). If there is an issue with MC34017A-1P, 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 MC34017A-1P part is unused and in its original packaging.
Return procedure for MC34017A-1P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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