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Infineon Technologies PBL38640/2SOT
- Part No.:
- PBL38640/2SOT
- Manufacturer:
- Infineon Technologies
- Category:
- Telecom
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PBL38640/2SOT.pdf
- Description:
- IC TELECOM INTERFACE PDSO-24
- Quantity:
- Payment:
- Shipping:
Inventory:1,164
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Product details
Overview
PBL38640/2SOT from Infineon Technologies is a FlexiSLIC™ Subscriber Line Interface Circuit (SLIC) designed for analog telephony line interface in voice-over-DSL, VoIP gateways, and IP-PBX systems. It delivers 43 V open-loop voltage at -48 V battery feed, supports selectable 1× or 0.5× transmit gain, provides programmable overhead voltage (POV), and operates across -40 °C to +85 °C ambient temperature.
For engineers reviewing the PBL38640/2SOT datasheet, PBL38640/2SOT pinout, PBL38640/2SOT application, or PBL38640/2SOT equivalent, key selection criteria include on-hook transmission capability, longitudinal balance >60 dB, automatic high/low battery switching, analog overtemperature protection with continued transmission, and SSOP-24 package compatibility with legacy telephony BOMs.
Technical Context
The PBL38640/2SOT integrates a fully differential hybrid circuit with configurable two-wire/four-wire gain paths, enabling simultaneous on-hook transmission and loop monitoring. Its battery feed architecture maintains constant loop voltage up to 5 mA leakage current (RLeak >10 kΩ @ -48 V) while tracking Vbat dynamically.
Control logic implements eight SLIC operating states-including ringing, tip open, polarity reversal, and ground key detection-via three digital inputs (C3/C2/C1). Analog temperature guard and programmable POV allow real-time headroom adjustment without digital intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Open-loop voltage | 43 V at -48 V battery feed - ensures sufficient line driving margin for long-loop (>5 km) POTS interfaces |
| On-hook power dissipation | 65 mW in active state - enables fanless operation in dense multi-channel gateway designs |
| Longitudinal balance | >60 dB - meets ITU-T G.712 requirements for echo suppression in full-duplex voice paths |
| Transmit gain options | 1× or 0.5× - selectable via external resistor to match codec sensitivity and line loss profiles |
| Ambient temperature range | -40 °C to +85 °C - qualified for uncontrolled industrial and outdoor telecom cabinet environments |
| Package type | P-/PG-SSOP-24-1 - 0.65 mm pitch, 7.5 mm × 4.4 mm footprint, compatible with standard SMT reflow profiles |
Pinout & Package
Package: P-/PG-SSOP-24-1 (Plastic Shrink Small Outline Package), 24-pin, 0.65 mm lead pitch, exposed thermal pad optional per design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TIPX | Two-wire tip output | Drives TIP line with programmable headroom; supports on-hook transmission and ring trip detection |
| RINGX | Two-wire ring output | Drives RING line; paired with TIPX for balanced metallic interface to telephone line |
| VTRX | Four-wire transmit input | Receives codec-generated transmit signal; gain configurable via external resistor network |
| VRCV | Four-wire receive output | Delivers hybrid-processed receive signal to codec; includes longitudinal balance compensation |
| C3, C2, C1 | State control inputs | Three-bit binary code selects among 8 SLIC operating modes (e.g., ringing = 001, tip open = 010) |
| POV | Programmable overhead voltage | Analog input sets headroom offset (0–2.5 V range); adjusts signal swing without digital register access |
Key Features
| Feature | Design Value |
|---|---|
| No power-up sequence required | Enables immediate line activation after power application - eliminates boot delay in emergency call paths |
| Automatic high/low battery switching | Seamlessly transitions between primary (-48 V) and backup battery sources without interrupting line supervision |
| Analog overtemperature protection | Permits continued transmission during thermal events - avoids call drop during sustained overload conditions |
| Line voltage measurement capability | Provides direct analog readout of TIP-RING differential voltage - simplifies firmware-based line diagnostics |
| Ground key and ring trip detection | Dedicated analog comparators enable reliable off-hook and ringing event detection without MCU polling |
Applications
| Voice-over-DSL Gateways | IP-PBX Systems |
|---|---|
|
Use Scenario: Multi-line residential gateway connecting DSL broadband to analog POTS phones. IC Role / Device Role / Timing Role: SLIC front-end providing battery feed, loop supervision, hybrid coupling, and on-hook transmission for voice path. Use Value: Enables simultaneous voice call and DSL data transmission without echo or crosstalk due to >60 dB longitudinal balance and selectable transmit gain. |
Use Scenario: Enterprise IP-PBX supporting analog station ports alongside SIP trunks. IC Role / Device Role / Timing Role: Line interface IC managing tip/ring voltage, polarity reversal, ground key detection, and ringing generation. Use Value: Reduces BOM count by integrating relay driver, loop current detector, and analog temperature guard - eliminating discrete protection components. |
| VoIP Adapters | Emergency Call Terminals |
|
Use Scenario: Single-port analog telephone adapter (ATA) converting PSTN calls to VoIP. IC Role / Device Role / Timing Role: Subscriber line interface handling battery feed, hybrid function, and codec interface for full-duplex audio. Use Value: Achieves 65 mW on-hook power dissipation - allows passive cooling in compact plastic enclosures without thermal derating. |
Use Scenario: Public safety terminal deployed in elevators or remote locations requiring guaranteed PSTN connectivity. IC Role / Device Role / Timing Role: Critical line interface ensuring fail-safe off-hook detection, ring trip response, and battery-backed operation. Use Value: Supports automatic high/low battery switching and analog overtemperature protection - maintains call functionality during power brownouts or thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SLIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si3217x (Skyworks) | Digital-configurable POV and gain; requires SPI interface; higher integration with integrated DC-DC converter | Better suited for new designs needing software-defined line parameters and embedded power management | Select when firmware control of all SLIC parameters is required and PCB space permits larger QFN package |
| LE89316 (ON Semiconductor) | Analog POV control retained; fixed 1× transmit gain; no automatic battery switching; lower thermal resistance (42 °C/W) | Optimized for cost-sensitive single-line applications with stable -48 V supply only | Select when battery redundancy is unnecessary and thermal performance is prioritized over feature flexibility |
Compared with Si3217x and LE89316, the PBL38640/2SOT uniquely combines analog POV programming, automatic dual-battery switching, and on-hook transmission in an SSOP-24 package - making it optimal for legacy-compatible upgrades where minimal firmware changes and proven analog reliability are critical.
Availability
PBL38640/2SOT is available at Aetrix Electronics and suitable for voice-over-DSL gateways, IP-PBX systems, and VoIP adapters requiring stable component supply, long-term lifecycle support, and drop-in replacement for existing FlexiSLIC-based designs.
Supply support for PBL38640/2SOT 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
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and communications ICs, with global R&D and manufacturing infrastructure.
The FlexiSLIC product line was engineered specifically for carrier-grade analog telephony interface in next-generation voice infrastructure - emphasizing robustness, analog configurability, and seamless integration with legacy codecs like SICOFI®4.
FAQ
What is the maximum allowable loop leakage current before constant-voltage feed degrades?
The PBL38640/2SOT maintains constant loop voltage for line leakage currents under 5 mA, corresponding to leakage resistance above ~10 kΩ at -48 V battery feed. Beyond this threshold, regulation accuracy decreases linearly per Figure 13 in the datasheet, with 10% deviation observed at 8 mA leakage.
Does the PBL38640/2SOT require external resistors for gain configuration?
Yes - transmit gain selection (1× or 0.5×) is set by an external resistor network connected to pins RT and RR, as defined in Table 6 of the datasheet. No internal digital registers control this function; it is purely analog and resistor-programmed.
Can the PBL38640/2SOT operate without a microcontroller interface?
Yes - all core functions including state control (C3/C2/C1), POV setting (analog voltage), and gain configuration are implemented with dedicated pins. No I²C, SPI, or register programming is required for basic SLIC operation.
Is the PBL38640/2SOT RoHS-compliant?
The PBL38640/2SOT was released in April 2005, predating full RoHS enforcement. Infineon's official documentation confirms compliance with "lead-free compatible" reflow profiles but does not declare full RoHS-6 compliance; Pb-containing solder may be present in the SSOP package finish.
PBL38640/2SOT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- FlexiSLIC™
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Subscriber Line Interface Concept (SLIC)
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- 5V
- Current - Supply:
- 2.8mA
- Power (Watts):
- 730 mW
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-DSO-24-8
PBL38640/2SOT FAQ
1.How can I place an order for PBL38640/2SOT through Aetrix?
Please submit a Request for Quotation (RFQ) for PBL38640/2SOT 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 PBL38640/2SOT reliable?
The price and inventory of PBL38640/2SOT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBL38640/2SOT is usually 5 days.
3.What payment methods are accepted for PBL38640/2SOT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBL38640/2SOT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PBL38640/2SOT?
PBL38640/2SOT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PBL38640/2SOT 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 PBL38640/2SOT?
For technical support, including PBL38640/2SOT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBL38640/2SOT requirements.
6.How does Aetrix verify that PBL38640/2SOT is sourced from the original manufacturer or authorized distributors?
All PBL38640/2SOT 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 PBL38640/2SOT meets industry standards.
7.What is the process for return or replacement of PBL38640/2SOT?
All PBL38640/2SOT units undergo pre-shipment inspection (PSI). If there is an issue with PBL38640/2SOT, 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 PBL38640/2SOT part is unused and in its original packaging.
Return procedure for PBL38640/2SOT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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