CS35L03-CWZR Equivalent & Substitute Parts

Part Overview

The CS35L03-CWZR is a Class D mono amplifier IC manufactured by Cirrus Logic Inc., designed to deliver 3W output power at 4Ohm load in a compact 9-WLCSP package. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support, production continuity, and system maintenance.

The obsolete status of the CS35L03-CWZR necessitates sourcing alternative components that maintain electrical and mechanical compatibility with existing designs while offering active product status and continued manufacturer support.

Substiute Parts

CS35L03-CWZR

Cirrus Logic Inc.In Stock: 849CS35L03-CWZR Datasheet

Current PartRFQ

LM4670ITLX/NOPB

Texas InstrumentsIn Stock: 6377LM4670ITLX/NOPB Datasheet

MFR RecommendedRFQ

TPA2028D1YZFR

Texas InstrumentsIn Stock: 69844TPA2028D1YZFR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CS35L03-CWZR are selected based on strict alignment with the following critical parameters:

Electrical Compatibility Criteria:

• Class D amplifier topology
• 1-Channel (Mono) output configuration
• 3W maximum output power at 4Ohm load
• Supply voltage range overlap (minimum 2.5V operation required)
• Presence of core protection features: Short-Circuit Protection, Thermal Protection, Shutdown capability
• Differential input architecture

Mechanical Compatibility Criteria:

• Surface mount technology
• 9-pin ball grid array package family (WLCSP, DSBGA, UFBGA variants)
• MSL Rating 1 (Unlimited moisture sensitivity)

Regulatory & Compliance Criteria:

• REACH Unaffected status
• EAR99 ECCN classification
• HTSUS code 8542.33.0001

Substitute parts must satisfy all electrical parameters while accommodating minor package footprint variations within the 9-pin BGA family. Supply voltage range and operating temperature range are evaluated for application fit rather than as absolute barriers to substitution.

Parameter Comparison

Engineering Selection Recommendations

LM4670ITLX/NOPB (Texas Instruments Boomer® Series)

The LM4670ITLX/NOPB is an active product offering direct electrical equivalence to the CS35L03-CWZR across all core amplifier specifications: Class D topology, 1-Channel mono output, 3W @ 4Ohm power delivery, and differential input architecture. Supply voltage range extends to 2.4V minimum, providing broader low-voltage compatibility. Operating temperature range of -40°C to 85°C exceeds the original specification.

The LM4670ITLX/NOPB includes depop functionality and short-circuit protection. Thermal protection is not specified for this variant. The 9-DSBGA package is mechanically compatible within the 9-pin BGA family. ROHS3 compliance and active product status ensure long-term availability and regulatory alignment.

TPA2028D1YZFR (Texas Instruments SmartGain™ Series)

The TPA2028D1YZFR is an active product providing electrical equivalence across core amplifier parameters: Class D topology, 1-Channel mono output, 3W @ 4Ohm power delivery, and differential input architecture. Supply voltage range of 2.5V to 5.5V matches the original specification exactly. Operating temperature range of -40°C to 85°C exceeds the original specification.

The TPA2028D1YZFR includes both short-circuit and thermal protection, matching the CS35L03-CWZR feature set. Additional integrated features include AGC (Automatic Gain Control), DRC (Dynamic Range Control), I2C interface, and volume control. The 9-DSBGA package is mechanically compatible within the 9-pin BGA family. ROHS3 compliance and active product status ensure long-term availability and regulatory alignment.

The TPA2028D1YZFR does not specify depop functionality. The additional control features (AGC, DRC, I2C, volume control) require firmware or hardware interface modifications compared to the original design.

Frequently Asked Questions (FAQ)

Q: Can the LM4670ITLX/NOPB directly replace the CS35L03-CWZR without PCB modifications?

A: The LM4670ITLX/NOPB and CS35L03-CWZR both use 9-pin ball grid array packages (DSBGA and WLCSP respectively). While pin counts are identical, physical footprint dimensions and ball pitch may differ. PCB layout verification is required before substitution. Electrical functionality is compatible across all core amplifier specifications.

Q: What is the primary difference between the LM4670ITLX/NOPB and TPA2028D1YZFR?

A: Both parts deliver equivalent core amplifier performance (Class D, 1-Channel, 3W @ 4Ohm). The TPA2028D1YZFR integrates additional signal processing features: Automatic Gain Control (AGC), Dynamic Range Control (DRC), I2C digital interface, and volume control. The LM4670ITLX/NOPB provides a simpler analog-only implementation. Design integration requirements determine which substitute is appropriate.

Q: Does the TPA2028D1YZFR require different firmware or control logic compared to the CS35L03-CWZR?

A: The TPA2028D1YZFR includes an I2C interface for digital control of AGC, DRC, and volume functions. The CS35L03-CWZR does not specify digital control capability. If the original design does not implement I2C control, the TPA2028D1YZFR can operate in default configuration mode. However, full feature utilization requires firmware or microcontroller modifications.

Q: Are there thermal protection differences between the substitute parts?

A: The CS35L03-CWZR specifies both short-circuit and thermal protection. The LM4670ITLX/NOPB specifies short-circuit protection only; thermal protection is not documented. The TPA2028D1YZFR specifies both short-circuit and thermal protection, matching the original specification. For applications requiring thermal shutdown capability, the TPA2028D1YZFR is the preferred substitute.

Q: What is the operating temperature range difference, and does it affect substitution?

A: The CS35L03-CWZR operates from -10°C to 70°C. Both substitute parts operate from -40°C to 85°C, providing extended temperature range capability. This difference does not prevent substitution; the broader range of the substitute parts accommodates the original specification and extends performance envelope for wider environmental conditions.

Q: Are the supply voltage ranges compatible?

A: The CS35L03-CWZR operates from 2.5V to 5.5V. The LM4670ITLX/NOPB operates from 2.4V to 5.5V, providing slightly lower minimum voltage capability. The TPA2028D1YZFR operates from 2.5V to 5.5V, matching the original exactly. Both substitutes are compatible with the original supply voltage specification.

Q: What packaging considerations apply to substitution?

A: The CS35L03-CWZR uses 9-WLCSP (1.21 x 1.22mm). Both substitute parts use 9-DSBGA packages. While both are 9-pin ball grid arrays, physical dimensions and ball pitch may differ. Footprint compatibility must be verified through datasheet comparison and PCB layout analysis before production implementation.

Q: Do all three parts have identical MSL (Moisture Sensitivity Level) ratings?

A: Yes. The CS35L03-CWZR, LM4670ITLX/NOPB, and TPA2028D1YZFR all carry MSL Rating 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.

Q: Are there regulatory compliance differences?

A: All three parts carry REACH Unaffected status and EAR99 ECCN classification. The substitute parts (LM4670ITLX/NOPB and TPA2028D1YZFR) are ROHS3 compliant, providing enhanced regulatory alignment for current manufacturing standards. The original CS35L03-CWZR RoHS status is not specified.