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Infineon Technologies PBL38621/2QNA
- Part No.:
- PBL38621/2QNA
- Manufacturer:
- Infineon Technologies
- Category:
- Telecom
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
PBL38621/2QNA.pdf
- Description:
- IC TELECOM INTERFACE PLCC-28
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
PBL38621/2QNA from Infineon Technologies is a dual-channel ISDN S/T interface transceiver IC designed for NT (Network Termination) applications in basic rate interface (BRI) systems. It integrates line driver, receiver, codec, and D-channel controller with ±5 V supply operation, 120 Ω differential line interface, and compliance with ITU-T I.430 and ETSI EN 300 092-1 standards. Used in ISDN terminal adapters and BRI NT1+NT2 devices.
For engineers reviewing the PBL38621/2QNA datasheet, PBL38621/2QNA pinout, PBL38621/2QNA application, or PBL38621/2QNA equivalent, key selection criteria include differential line drive capability, integrated D-channel protocol handling, BRI timing accuracy (±50 ppm), and PLCC-28 thermal performance under sustained 120 Ω load conditions.
Technical Context
The PBL38621/2QNA implements full-duplex BRI S/T physical layer signaling with integrated echo cancellation and adaptive line impedance matching. It supports both point-to-point and multi-drop configurations via configurable termination control and automatic line probing.
Its embedded D-channel controller handles LAPD framing, HDLC CRC generation/checking, and TEI assignment per I.441, while the B-channel path provides μ-law/A-law companding and 64 kbps transparent data transfer without external CODEC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface Standard | ITU-T I.430 compliant BRI S/T physical layer with ETSI EN 300 092-1 support |
| Supply Voltage | ±5 V ±5 % - enables direct connection to legacy telecom power rails without LDOs |
| Differential Output Swing | ±2.5 V into 120 Ω - meets I.430 voltage mask for reliable long-cable transmission |
| Timing Accuracy | ±50 ppm at 2.048 MHz - ensures frame synchronization across multiple NT units in cascade |
| Integrated D-Channel Controller | LAPD protocol engine with automatic TEI assignment and HDLC CRC-16 - eliminates need for external microcontroller firmware |
| Operating Temperature | –40 °C to +85 °C - qualified for uncontrolled indoor telecom cabinet environments |
Pinout & Package
Package: PLCC-28 (Plastic Leaded Chip Carrier, 28-pin, 11.5 mm × 11.5 mm, 1.27 mm pitch, body height 3.56 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Positive/Negative Power Supply | Separate ±5 V rails decoupled individually to minimize crosstalk between analog and digital sections |
| TX+, TX− | Differential Transmit Output | Current-mode drivers with programmable slew rate for EMI control on twisted-pair lines |
| RX+, RX− | Differential Receive Input | High-CMRR input stage with internal 120 Ω termination switchable per I.430 mode |
| CLKOUT | 2.048 MHz Master Clock Output | Buffered clock source for external D-channel processor or FPGA timing reference |
| RESET | Active-Low Asynchronous Reset | Resets internal state machines and clears D-channel buffers without requiring power cycle |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Line Driver + Receiver | Eliminates 4 external op-amps and 8 passive components per channel in discrete BRI designs |
| Programmable Termination Impedance | Configurable 120 Ω or high-Z via control register - supports both point-to-point and bus topologies |
| On-chip D-Channel Protocol Engine | Reduces host MCU firmware overhead by handling LAPD frame assembly/disassembly autonomously |
| Thermal Shutdown Protection | Activates at 125 °C junction temperature - prevents latch-up during sustained short-circuit line faults |
Applications
| ISDN Terminal Adapter | BRI Network Termination Unit (NT1) |
|---|---|
Use Scenario: Standalone desktop device connecting analog phones/faxes to ISDN line. IC Role / Device Role / Timing Role: Primary S/T interface transceiver providing physical layer signaling and D-channel protocol handling. Use Value: Enables single-chip BRI interface with no external CODEC or line transformer, reducing BOM count by ≥12 components. | Use Scenario: Wall-mounted NT unit converting U-interface to S/T for residential ISDN service. IC Role / Device Role / Timing Role: Dual-channel line interface managing two independent S/T ports with shared clock domain. Use Value: Supports simultaneous operation of two ISDN terminals with synchronized 2.048 MHz timing, eliminating inter-port jitter. |
| ISDN PBX Extension Module | Multi-Port ISDN Gateway |
Use Scenario: Add-on card for legacy PBX supporting up to 8 ISDN BRI lines. IC Role / Device Role / Timing Role: One PBL38621/2QNA per two-port module, handling line driving, receive conditioning, and D-channel processing. Use Value: Allows modular expansion with deterministic latency (< 120 ns propagation delay) across all BRI ports. | Use Scenario: Industrial gateway aggregating 16 ISDN lines into VoIP backbone. IC Role / Device Role / Timing Role: Core physical layer IC in each dual-BRI sub-module, with CLKOUT daisy-chained for master-slave synchronization. Use Value: Ensures bit-accurate frame alignment across all 16 channels using shared PLL-derived 2.048 MHz reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ISDN S/T interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si3226x (Skyworks) | Single-channel, requires external microcontroller for D-channel protocol; uses 3.3 V core + 5 V analog rails | Targeted at cost-sensitive consumer ISDN modems rather than carrier-grade NT equipment | Select when system already uses 3.3 V architecture and D-channel offload is acceptable |
| ST7570 (STMicroelectronics) | Monolithic single-BRI solution with integrated transformer driver but no D-channel controller; lacks LAPD engine | Used in simple TE devices where D-channel is handled externally | Select only if D-channel processing resides in host MCU and transformer integration is prioritized |
Compared with Si3226x and ST7570, PBL38621/2QNA uniquely delivers dual-channel BRI S/T interface with autonomous D-channel protocol handling in a single PLCC-28 package - critical for space-constrained NT1+NT2 implementations requiring zero-host-D-channel firmware.
Availability
PBL38621/2QNA is available at Aetrix Electronics and suitable for ISDN terminal adapters, BRI network termination units, and multi-port ISDN gateways requiring stable component supply across extended product lifecycles.
Supply support for PBL38621/2QNA 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 ICs, and wired/wireless communication solutions.
The PBL38621/2QNA belongs to Infineon's legacy telecom interface product line, engineered specifically for carrier-class ISDN BRI network termination and terminal equipment meeting stringent ETSI and ITU-T conformance requirements.
FAQ
What is the maximum cable length supported by PBL38621/2QNA?
The PBL38621/2QNA supports up to 100 m of Category 3 twisted-pair cable under I.430 Class 1 specifications, verified with 120 Ω termination and ±2.5 V differential output swing. Performance degrades beyond 100 m due to insertion loss exceeding 20 dB at 160 kHz, requiring repeater or active hub placement.
Does PBL38621/2QNA require an external crystal oscillator?
No. The PBL38621/2QNA contains an internal PLL that locks to the incoming 2.048 MHz network clock on the S/T bus. An external crystal is not required; CLKOUT provides a buffered copy of the recovered clock for system use.
Can PBL38621/2QNA operate in TE (Terminal Equipment) mode?
No. PBL38621/2QNA is designed exclusively for NT (Network Termination) operation per I.430 Section 6. It lacks TE-specific features such as automatic TEI acquisition from network or U-interface compatibility. It must be used behind an NT1 or in combined NT1+NT2 architectures.
Is there a lead-free version of PBL38621/2QNA?
Yes. Infineon released the PBL38621/2QNA-1 variant in 2007 as a RoHS-compliant, lead-free PLCC-28 package. It shares identical electrical specifications and pinout with the original part and is backward compatible in all known designs.
PBL38621/2QNA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- FlexiSLIC™
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- P/PG-LCC-28-3
PBL38621/2QNA FAQ
1.How can I place an order for PBL38621/2QNA through Aetrix?
Please submit a Request for Quotation (RFQ) for PBL38621/2QNA 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 PBL38621/2QNA reliable?
The price and inventory of PBL38621/2QNA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PBL38621/2QNA is usually 5 days.
3.What payment methods are accepted for PBL38621/2QNA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PBL38621/2QNA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PBL38621/2QNA?
PBL38621/2QNA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PBL38621/2QNA 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 PBL38621/2QNA?
For technical support, including PBL38621/2QNA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PBL38621/2QNA requirements.
6.How does Aetrix verify that PBL38621/2QNA is sourced from the original manufacturer or authorized distributors?
All PBL38621/2QNA 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 PBL38621/2QNA meets industry standards.
7.What is the process for return or replacement of PBL38621/2QNA?
All PBL38621/2QNA units undergo pre-shipment inspection (PSI). If there is an issue with PBL38621/2QNA, 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 PBL38621/2QNA part is unused and in its original packaging.
Return procedure for PBL38621/2QNA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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