LMH6503MAX Variable Gain Amplifier Equivalent & Substitute Parts

Part Overview

The LMH6503MAX is a variable gain amplifier integrated circuit designed for wideband, low-power applications requiring single-circuit amplification in a 14-SOIC surface mount package. This device operates across a 5V to 12V supply range with a slew rate of 1800V/µs and -3dB bandwidth of 135 MHz, making it suitable for signal conditioning and gain control applications.

The LMH6503MAX is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesign initiatives.

Substiute Parts

LMH6503MAX

Texas InstrumentsIn Stock: 1710LMH6503MAX Datasheet

Current PartRFQ

LMH6503MAX/NOPB

National SemiconductorIn Stock: 3655LMH6503MAX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LMH6503MAX is determined by strict equivalence across the following critical parameters:

Electrical Performance Criteria:

• Amplifier type classification (Variable Gain)
• Single circuit configuration
• Slew rate specification (1800V/µs)
• -3dB bandwidth (135 MHz)
• Input bias current (11 µA)
• Supply current (37 mA)
• Output current per channel (90 mA)
• Supply voltage range (5V to 12V)
• Operating temperature range (-40°C to 85°C)

Physical & Packaging Criteria:

• Package type: 14-SOIC surface mount
• Package dimensions: 0.154" width (3.90mm)

Compliance & Status Criteria:

• ECCN classification (EAR99)
• HTSUS code (8542.33.0001)

The LMH6503MAX/NOPB variant meets all electrical and physical requirements for direct substitution. The "/NOPB" suffix indicates lead-free, RoHS-compliant packaging, representing an active product status alternative to the obsolete base part.

Parameter Comparison

Engineering Selection Recommendations

For Obsolete Part Replacement:

The LMH6503MAX/NOPB is the direct functional equivalent of the LMH6503MAX. All electrical parameters, circuit configuration, and physical packaging specifications are identical. The primary distinction is product status: the LMH6503MAX/NOPB is actively manufactured and supported, whereas the LMH6503MAX is obsolete.

Compliance Advantage:

The LMH6503MAX/NOPB incorporates lead-free, RoHS-compliant packaging (indicated by the "/NOPB" suffix), meeting current environmental and regulatory standards. The original LMH6503MAX is RoHS non-compliant. Both parts maintain identical ECCN (EAR99) and HTSUS (8542.33.0001) classifications for export and tariff purposes.

Supply Chain Consideration:

The LMH6503MAX/NOPB maintains higher inventory availability (3545 pieces in stock versus 1600 pieces for the obsolete variant), supporting sustained procurement for production and maintenance applications.

Design Integration:

No circuit redesign, PCB layout modification, or firmware adjustment is required when substituting the LMH6503MAX/NOPB for the LMH6503MAX. Pin configuration, electrical performance, and thermal characteristics remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can the LMH6503MAX/NOPB be used as a direct replacement for the LMH6503MAX in existing designs?

A: Yes. All electrical specifications, circuit performance parameters, and physical package dimensions are identical. The device operates within the same supply voltage range (5V to 12V), maintains the same slew rate (1800V/µs), bandwidth (135 MHz), and output current capability (90 mA per channel). No circuit modifications are required.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix designates a lead-free, RoHS-compliant packaging variant. This indicates the part meets current environmental regulations for hazardous substance restrictions. The electrical and functional performance is identical to the base part number.

Q: Are there any differences in pin configuration between the LMH6503MAX and LMH6503MAX/NOPB?

A: No. Both parts use the 14-SOIC surface mount package with identical pin assignments, spacing (0.154" width, 3.90mm), and functional pinout. PCB layouts designed for one part are directly compatible with the other.

Q: Why is the LMH6503MAX classified as obsolete?

A: The LMH6503MAX has been discontinued by the original manufacturer. The LMH6503MAX/NOPB represents the active, supported variant that maintains full functional equivalence while meeting modern manufacturing and compliance standards.

Q: What is the inventory status for each part?

A: The LMH6503MAX has 1600 pieces in stock (obsolete status). The LMH6503MAX/NOPB has 3545 pieces in stock (active status). For new designs or long-term production support, the LMH6503MAX/NOPB is the recommended selection due to superior availability and active manufacturer support.

Q: Are there any thermal or reliability differences between these parts?

A: No thermal or reliability differences exist. Both parts operate across the identical temperature range (-40°C to 85°C), maintain the same input bias current (11 µA), supply current (37 mA), and output current specifications (90 mA per channel). Moisture sensitivity level for the LMH6503MAX is rated as MSL 1 (Unlimited).

Q: Can these parts be used interchangeably in production?

A: Yes. From an engineering and manufacturing perspective, the LMH6503MAX and LMH6503MAX/NOPB are fully interchangeable. Identical soldering profiles, reflow temperatures, and handling procedures apply to both variants. The "/NOPB" variant may be preferred for new production runs due to active status and RoHS compliance.