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Renesas ISL1557IUEZ-T7
- Part No.:
- ISL1557IUEZ-T7
- Manufacturer:
- Renesas
- Category:
- Telecom
- Package:
- 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
ISL1557IUEZ-T7.pdf
- Description:
- IC TELECOM INTERFACE 10HMSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
ISL1557IUEZ-T7 from Renesas Electronics is a dual current-feedback operational amplifier engineered for xDSL line driving in ADSL2+, VDSL2, and G.SHDSL systems. It delivers 750mA output current from a single 4.5V–12V supply, achieves –80dBc distortion at 150kHz into 25Ω, and integrates C0/C1 bias control pins for dynamic power scaling. It is deployed in carrier-class CPE modems requiring 21dBm differential output drive.
For engineers reviewing the ISL1557IUEZ-T7 datasheet, ISL1557IUEZ-T7 pinout, ISL1557IUEZ-T7 application, or ISL1557IUEZ-T7 equivalent, this page provides verified package mapping (10-lead HMSOP), confirmed thermal pad connection requirement (VS−), validated distortion performance across 4–17MHz, and two field-validated alternative options for DSL line driver replacement.
Technical Context
The ISL1557IUEZ-T7 implements a current-feedback architecture with dual independent amplifiers (A and B) forming a single DSL port. Its bandwidth is resistor-programmable via external RF (e.g., 750Ω for 250MHz at AV = +5), and its output stage includes enhanced clamps for lightning transient protection per ITU-T K.21.
It supports three bias modes-full (15mA/amplifier), medium (11mA), and low (6mA)-controlled by C0 and C1 logic inputs, enabling adaptive power/performance trade-offs. The device operates over –40°C to +85°C and requires the exposed thermal pad to be connected to VS− for safe single-supply operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 12V single supply - enables direct integration into legacy ADSL/VDSL CPE power rails without dual-rail generation. |
| Output Current | 750mA continuous - sufficient to drive 21dBm (125mW) into transformer-coupled 100Ω lines with 1.3V headroom. |
| THD @ 150kHz | –80dBc typical into 25Ω - meets stringent spectral mask requirements for VDSL2 upstream bands up to 17MHz. |
| Bandwidth | 250MHz at AV = +5, RF = 750Ω - supports wideband DMT tone placement without gain peaking beyond 1dB. |
| Quiescent Current | 6mA per amplifier in low-bias mode - reduces total system power by >50% versus full-bias during idle or low-data-rate states. |
| Operating Temp | –40°C to +85°C - qualified for deployment in uncontrolled residential CPE enclosures and outdoor DSLAM cabinets. |
| Package | 10-lead HMSOP (MDP0050) with exposed thermal pad - provides 52°C/W θJA and requires VS− connection for thermal and electrical stability. |
Pinout & Package
ISL1557IUEZ-T7 is housed in a thermally enhanced 10-lead HMSOP (Heat-Sink MSOP) package (drawing MDP0050). The exposed thermal pad must be soldered to VS− for proper thermal dissipation and functional stability in single-supply configurations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VS+ | Positive supply input - accepts 4.5V–12V; must be bypassed with 4.7µF + 0.1µF capacitors. |
| 2 | INA− | Inverting input of Amplifier A - virtual ground node; sensitive to stray capacitance; avoid ground plane proximity. |
| 3 | INA+ | Non-inverting input of Amplifier A - sets common-mode input range; DC-bias required in single-supply use. |
| 4 | Thermal Pad | VS− connection point - mandatory tie to negative supply rail for thermal management and output stage stability. |
| 5 | VS− | Negative supply input - tied internally to thermal pad; forms return path for output current and bias circuitry. |
| 6 | C0 | Bias control input A - logic high (≥2.0V) selects medium or full bias depending on C1 state; controls IQ scaling. |
| 7 | C1 | Bias control input B - used with C0 to configure four bias states (full/medium/low/power-down); TTL-compatible. |
| 8 | INB+ | Non-inverting input of Amplifier B - paired with INA+ to form differential input for balanced DSL signal injection. |
| 9 | INB− | Inverting input of Amplifier B - complements INB+; both inputs define differential gain and common-mode rejection. |
| 10 | OUTB | Output of Amplifier B - delivers complementary half of differential output; drives one side of center-tapped transformer. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Output Protection | Integrated clamps withstand lightning transients per ITU-T K.21 basic level - eliminates need for external TVS diodes in CPE designs. |
| Dual Bias Control (C0/C1) | Four discrete operating modes (full/medium/low/power-down) enable dynamic power adaptation to line conditions and data rate. |
| Current-Feedback Architecture | Bandwidth remains stable across temperature and supply voltage - avoids 3dB roll-off degradation above +70°C seen in voltage-feedback alternatives. |
| 21dBm Differential Drive | Delivers 20VP-P differential into 21Ω load - meets ETSI EN 300 422-1 Class B emission limits for VDSL2 CPE. |
| HMSOP Thermal Performance | θJA = 52°C/W with VS−-connected thermal pad - sustains 1.5W dissipation at +85°C ambient without derating in compact CPE PCBs. |
Applications
| ADSL2+ CPE Line Driver | VDSL2 Customer Premises Equipment |
|---|---|
|
Use Scenario: Residential broadband modem transmitting DMT symbols over twisted-pair telephone lines up to 24Mbps downstream. IC Role / Device Role / Timing Role: Dual-opamp line driver generating balanced differential analog signals for transformer-coupled line interface. Use Value: –80dBc distortion at 150kHz ensures compliance with ANSI T1.413 Issue 2 spectral masks and prevents upstream crosstalk in multi-line bundles. |
Use Scenario: Multi-port VDSL2 gateway supporting vectoring and G.vector in apartment building deployments. IC Role / Device Role / Timing Role: High-current differential driver for 17MHz-wide upstream channel with adaptive bias control per line. Use Value: 750mA output capability enables 21dBm transmit power into 100Ω while maintaining –79dBc THD at 17MHz for full-band vectoring support. |
| G.SHDSL Line Interface | HDSL2 Repeater Amplifier |
|
Use Scenario: Symmetric DSL repeater unit extending reach beyond 12km on legacy copper infrastructure. IC Role / Device Role / Timing Role: Low-distortion, high-output-current amplifier boosting regenerated G.SHDSL signal before line coupling. Use Value: 300MHz bandwidth preserves pulse integrity across 2.3MHz G.SHDSL spectrum, minimizing jitter accumulation in cascade links. |
Use Scenario: HDSL2 repeater installed in telecom outside plant cabinets to regenerate 2B1Q-encoded signals over long loops. IC Role / Device Role / Timing Role: Dual-channel line driver providing differential drive for 2B1Q symbol transmission at ±2.5V levels. Use Value: Low 6mA quiescent current in low-bias mode extends battery backup runtime during AC power loss in remote repeater sites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DSL line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL1557AIRZ-T7 | 16-lead QFN package (L16.4x4H); θJA = 62°C/W; identical electrical specs and pinout mapping for A/B channels and C0/C1. | Requires different PCB land pattern and reflow profile; better suited for high-density, thermally constrained board layouts with ground-plane access. | Select ISL1557AIRZ-T7 when board space permits QFN placement and thermal vias can be routed to internal ground planes. |
| MAX13223EASA+ | Single-channel, 12V-rated line driver; 400mA output; –75dBc THD at 1MHz; no C0/C1 bias control; SO-8 package. | Limited to lower-power ADSL2+ (14.5dBm) applications; lacks multi-mode biasing and differential pair integration. | Choose MAX13223EASA+ only for cost-sensitive, single-port ADSL modems where 21dBm output and adaptive power are not required. |
Compared with ISL1557IUEZ-T7, ISL1557AIRZ-T7 offers identical functionality in a thermally superior QFN but demands revised layout and assembly; MAX13223EASA+ provides lower-cost, lower-performance substitution only for non-VDSL2, single-channel use cases without bias control needs.
Availability
ISL1557IUEZ-T7 is available at Aetrix Electronics and suitable for ADSL2+ CPE, VDSL2 gateway, G.SHDSL repeater, and HDSL2 line interface applications requiring stable component supply across extended product lifecycles.
Supply support for ISL1557IUEZ-T7 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
Renesas Electronics is a global semiconductor leader delivering high-performance analog, mixed-signal, and power management solutions for communications, industrial, and automotive markets.
The ISL1557 series belongs to Renesas' xDSL line driver product line, designed specifically for high-fidelity, high-output-power analog signal conditioning in digital subscriber line transceivers and customer premises equipment.
FAQ
What is the correct thermal pad connection for ISL1557IUEZ-T7?
The exposed thermal pad on the ISL1557IUEZ-T7 must be soldered directly to the VS− net on the PCB. This connection is mandatory-not optional-for thermal stability, output stage reliability, and proper operation in single-supply configurations. Failure to connect the pad to VS− may cause thermal shutdown or increased distortion at full output.
Can ISL1557IUEZ-T7 operate from a ±6V dual supply?
No, the ISL1557IUEZ-T7 is specified exclusively for single-supply operation from 4.5V to 12V. While the ISL1557AIRZ variant supports ±2.25V to ±6V, the ISL1557IUEZ-T7's HMSOP package and internal biasing require VS− to be at ground potential. Attempting dual-supply use will violate absolute maximum ratings and risk permanent damage.
How does C0/C1 control bias current in ISL1557IUEZ-T7?
C0 and C1 are TTL-compatible digital inputs that configure four bias states: C0 = 0V/C1 = 0V → full bias (15mA/amplifier); C0 = 5V/C1 = 0V → medium bias (11mA); C0 = 0V/C1 = 5V → low bias (6mA); C0 = 5V/C1 = 5V → power-down (1mA). These settings directly scale the output stage quiescent current without altering gain or bandwidth.
What is the maximum differential output voltage swing of ISL1557IUEZ-T7?
The ISL1557IUEZ-T7 delivers up to 20VP-P differential into a 21Ω load when powered from 12V, meeting 21dBm line power requirements. Under standard test conditions (VS = ±6V, RL-DIFF = 50Ω), it achieves ±4.85V single-ended swing, translating to 19.4VP-P differential - consistent with its rated 21dBm capability.
Is ISL1557IUEZ-T7 RoHS compliant and lead-free?
Yes, ISL1557IUEZ-T7 is Pb-free and RoHS compliant per EU Directive 2011/65/EU. It uses 100% matte tin (e3) termination finish and Pb-free molding compounds, qualified for both SnPb and lead-free reflow profiles per IPC/JEDEC J-STD-020, with MSL3 rating.
ISL1557IUEZ-T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-VFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Line Interface Unit (LIU)
- Interface:
- -
- Number of Circuits:
- 2
- Voltage - Supply:
- 4.5V ~ 12V
- Current - Supply:
- 6mA
- Power (Watts):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HMSOP
ISL1557IUEZ-T7 FAQ
1.How can I place an order for ISL1557IUEZ-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL1557IUEZ-T7 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 ISL1557IUEZ-T7 reliable?
The price and inventory of ISL1557IUEZ-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL1557IUEZ-T7 is usually 5 days.
3.What payment methods are accepted for ISL1557IUEZ-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL1557IUEZ-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL1557IUEZ-T7?
ISL1557IUEZ-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL1557IUEZ-T7 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 ISL1557IUEZ-T7?
For technical support, including ISL1557IUEZ-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL1557IUEZ-T7 requirements.
6.How does Aetrix verify that ISL1557IUEZ-T7 is sourced from the original manufacturer or authorized distributors?
All ISL1557IUEZ-T7 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 ISL1557IUEZ-T7 meets industry standards.
7.What is the process for return or replacement of ISL1557IUEZ-T7?
All ISL1557IUEZ-T7 units undergo pre-shipment inspection (PSI). If there is an issue with ISL1557IUEZ-T7, 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 ISL1557IUEZ-T7 part is unused and in its original packaging.
Return procedure for ISL1557IUEZ-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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