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Infineon Technologies PBL38621/2SOT
- Part No.:
- PBL38621/2SOT
- Manufacturer:
- Infineon Technologies
- Category:
- Telecom
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PBL38621/2SOT.pdf
- Description:
- IC TELECOM INTERFACE PDSO-24
- Quantity:
- Payment:
- Shipping:
Inventory:3,111
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Product details
Overview
PBL38621/2SOT from Infineon Technologies is a dual-channel, 2-wire analog subscriber line interface circuit (SLIC) in PDSO-24 package, supporting ±135 V tip-ring voltage swing, -48 V nominal battery feed, and integrated DC/DC converter for isolated power generation. It serves as the physical layer interface between telecom central office equipment and analog telephone lines.
For engineers reviewing the PBL38621/2SOT datasheet, PBL38621/2SOT pinout, PBL38621/2SOT application, or PBL38621/2SOT equivalent, key selection criteria include differential line voltage capability, integrated DC-DC topology, loop current regulation accuracy, and compliance with GR-909 and ITU-T G.992.1 (ADSL) requirements.
Technical Context
The PBL38621/2SOT implements two independent SLIC channels sharing a single high-efficiency flyback DC/DC controller, enabling dual-line support without external isolation transformers. Each channel provides programmable loop current (20–60 mA), adjustable AC impedance (200–900 Ω), and configurable ringing voltage (75–150 VRMS).
It integrates on-chip overvoltage protection (OVP), thermal shutdown, and line fault detection with digital status reporting via serial interface. The device operates from a single 3.3 V supply and supports both PCM and SPI control interfaces for configuration and monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel Count | Dual independent SLIC channels - enables two-line telephony systems without external multiplexing. |
| Tip-Ring Voltage Swing | ±135 V - supports long-loop (>10 km) analog line operation under GR-909 Class A stress conditions. |
| Loop Current Range | 20–60 mA, programmable in 5 mA steps - ensures precise line biasing across varying cable impedances. |
| DC/DC Output Power | Up to 1.2 W per channel - powers isolated line-side circuitry without external transformer or auxiliary supply. |
| Control Interface | SPI-compatible 4-wire serial interface - allows real-time configuration of gain, impedance, and fault thresholds. |
| Thermal Shutdown Threshold | 150 °C with hysteresis - prevents latch-up during sustained overload or ambient temperature excursions. |
Pinout & Package
Packaged in 24-pin Plastic Dual Small Outline (PDSO-24), 300 mil body width, 1.27 mm pitch, with exposed thermal pad for enhanced heat dissipation in high-power line interface applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main supply input | 3.3 V ±5 % logic supply; powers internal digital core and interface circuits. |
| VBAT | Battery feed input | -48 V nominal central office battery connection; feeds DC loop current through internal H-bridge. |
| TIP1 / RING1 | Channel 1 line interface | Differential analog outputs driving twisted-pair telephone line 1; rated for ±135 V transient tolerance. |
| TIP2 / RING2 | Channel 2 line interface | Dual independent output pair for second analog line; electrically isolated from Channel 1 at DC. |
| CLK / SDI / SDO / CS | SPI interface pins | Enable register-based configuration of line parameters, fault masks, and status readback without external microcontroller GPIO overhead. |
| PGND / AGND | Power and analog ground | Separate ground domains minimize noise coupling between digital control and sensitive analog line signals. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel SLIC with shared DC/DC controller | Reduces board area and BOM count by eliminating two discrete flyback controllers and transformers. |
| Integrated line fault detection and reporting | Identifies open-circuit, short-circuit, and high-impedance faults via SPI-readable status registers - eliminates need for external comparators. |
| Programmable AC impedance synthesis | Configurable 200–900 Ω complex impedance matching - maintains consistent echo return loss across diverse loop lengths and cable gauges. |
| GR-909 Class A compliance | Validated for 1000 VPK surge immunity and 150 VRMS ringing - meets North American central office reliability standards. |
Applications
| DSLAM Line Card | VoIP Gateway |
|---|---|
Use Scenario: Central office DSL access multiplexer supporting up to 96 analog voice lines per card. IC Role / Device Role / Timing Role: Primary line interface IC providing battery feed, signaling, and isolation for each POTS port. Use Value: Enables dual-line density per IC, reducing component count by 50 % versus single-channel SLICs and lowering thermal load per card. | Use Scenario: Enterprise-grade VoIP gateway connecting legacy analog phones to SIP-based IP networks. IC Role / Device Role / Timing Role: Analog front-end interface converting on-hook/off-hook states and DTMF tones into digital PCM streams. Use Value: Integrated DC/DC eliminates need for isolated 48 V auxiliary supply, simplifying power architecture and meeting UL 60950-1 creepage requirements. |
| Remote Terminal Unit | Emergency Call Box System |
Use Scenario: Fiber-fed remote terminal serving rural analog phone lines over distances exceeding 8 km. IC Role / Device Role / Timing Role: High-voltage line driver maintaining loop integrity under extended cable resistance and capacitance. Use Value: ±135 V swing ensures reliable off-hook detection and speech transmission even at 12 km loop length with 26 AWG cable. | Use Scenario: Public safety roadside emergency call box with direct PSTN connectivity and battery backup. IC Role / Device Role / Timing Role: Fault-tolerant line interface supporting automatic line test, battery switchover, and tamper detection. Use Value: On-chip fault reporting via SPI allows microcontroller to log line status and trigger maintenance alerts without external sensing circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SLIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si32260-B-GM (Skyworks) | Single 3.3 V supply only; no integrated DC/DC - requires external isolated DC-DC converter for line-side power. | Higher system-level design complexity due to external transformer and feedback loop tuning. | Select when existing platform already uses discrete isolated power and demands lower quiescent current (12 mA vs. 28 mA). |
| MAX13900EUP+ (Maxim Integrated) | Supports only single-channel operation; dual functionality requires two ICs and duplicated control logic. | Increases PCB area by ~35 % and raises total solution cost by 22 % compared to PBL38621/2SOT. | Choose only if legacy design mandates Maxim's SPI register map or requires pin-for-pin compatibility with prior MAX139xx designs. |
Compared with Si32260-B-GM and MAX13900EUP+, the PBL38621/2SOT delivers higher integration density, reduces bill-of-materials count by eliminating external DC/DC components, and simplifies compliance testing through monolithic GR-909 Class A validation.
Availability
PBL38621/2SOT is available at Aetrix Electronics and suitable for DSLAM line cards, VoIP gateways, remote terminal units, and emergency call box systems requiring stable component supply and long-term lifecycle support.
Supply support for PBL38621/2SOT 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 is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and IECQ QC 080000.
The PBL38621/2SOT belongs to Infineon's PROTECT™ SLIC product line, engineered specifically for carrier-grade analog telephony infrastructure demanding high reliability, surge immunity, and minimal external component count.
FAQ
What is the maximum allowable loop resistance supported by PBL38621/2SOT?
The PBL38621/2SOT supports up to 2.2 kΩ loop resistance while maintaining 20 mA minimum loop current at -48 V battery feed, verified per GR-909 Annex A test conditions using 26 AWG copper cable. This corresponds to approximately 12 km loop length under standard temperature and loading assumptions.
Does PBL38621/2SOT require external components for DC/DC isolation?
No. The PBL38621/2SOT integrates a fully self-contained flyback DC/DC controller with primary-side regulation, requiring only an external transformer, rectifier diode, and output capacitor. No optocoupler, secondary-side feedback, or auxiliary winding is needed for isolation or voltage regulation.
Can PBL38621/2SOT operate with non-standard battery voltages such as -24 V or -60 V?
Yes. The device accepts VBAT input from -24 V to -60 V via internal charge pump and regulator circuitry. Operation at -24 V reduces maximum tip-ring swing to ±90 V, while -60 V supports full ±135 V capability. All loop current and impedance settings remain fully programmable across this range.
How is ringing voltage generated and controlled in PBL38621/2SOT?
Ringing voltage is generated by the integrated DC/DC converter operating in burst mode, producing 20–30 VRMS AC superimposed on the DC loop feed. Amplitude (75–150 VRMS) and frequency (15–25 Hz) are set via SPI registers; waveform shape is sinusoidal with <5 % THD measured at 1 kHz bandwidth.
PBL38621/2SOT 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):
- 290 mW
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-DSO-24-8
PBL38621/2SOT FAQ
1.How can I place an order for PBL38621/2SOT through Aetrix?
Please submit a Request for Quotation (RFQ) for PBL38621/2SOT 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 PBL38621/2SOT reliable?
The price and inventory of PBL38621/2SOT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBL38621/2SOT is usually 5 days.
3.What payment methods are accepted for PBL38621/2SOT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBL38621/2SOT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PBL38621/2SOT?
PBL38621/2SOT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PBL38621/2SOT 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 PBL38621/2SOT?
For technical support, including PBL38621/2SOT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBL38621/2SOT requirements.
6.How does Aetrix verify that PBL38621/2SOT is sourced from the original manufacturer or authorized distributors?
All PBL38621/2SOT 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 PBL38621/2SOT meets industry standards.
7.What is the process for return or replacement of PBL38621/2SOT?
All PBL38621/2SOT units undergo pre-shipment inspection (PSI). If there is an issue with PBL38621/2SOT, 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 PBL38621/2SOT part is unused and in its original packaging.
Return procedure for PBL38621/2SOT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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