QTM452T1 Equivalent & Substitute Parts Reference

Part Overview

The QTM452T1 is a single-channel optoisolator with transistor output manufactured by QT Brightek (QTB). This component provides 3750Vrms isolation voltage and is designed for applications requiring galvanic isolation between input and output circuits. The device features a 5-Mini-Flat package configuration optimized for surface mount assembly. As an active product with full RoHS3 compliance and unlimited moisture sensitivity rating, the QTM452T1 remains in production. Substitute parts are identified for applications where alternative sourcing, packaging formats, or inventory availability require component interchange.

Substiute Parts

QTM452T1

QT Brightek (QTB)In Stock: 1163QTM452T1 Datasheet

Current PartRFQ

HCPL-M452-500E

Broadcom LimitedIn Stock: 1221HCPL-M452-500E Datasheet

Parametric EquivalentRFQ

HCPL-M453-500E

Broadcom LimitedIn Stock: 65045HCPL-M453-500E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the QTM452T1 are qualified based on electrical and mechanical parameter equivalence within the optoisolator transistor output category. The substitution criteria are:

Electrical Equivalence Requirements:

• Isolation voltage: 3750Vrms (exact match)
• Number of channels: 1 (exact match)
• Output type: Transistor (exact match)
• Current transfer ratio range: 20% to 50% @ 16mA (exact match)
• Maximum output voltage: 20V (exact match)
• Output current per channel: 8mA (exact match)
• Maximum DC forward current: 25mA (exact match)
• Operating temperature range: -55°C to 100°C (exact match)

Mechanical Equivalence Requirements:

• Package type: 6-SOIC (0.173", 4.40mm Width), 5 Leads (exact match)
• Mounting type: Surface Mount (exact match)

Compliance Equivalence Requirements:

• RoHS3 Compliant (exact match)
• Moisture Sensitivity Level 1 (exact match)

The identified substitute parts meet all electrical and mechanical parameters. Variations in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and turn-on/turn-off timing characteristics do not affect functional substitution within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

All three components—QTM452T1, HCPL-M452-500E, and HCPL-M453-500E—are active products with full RoHS3 compliance and REACH unaffected status. Selection between these parts is based on availability, packaging format preference, and timing characteristics within the specified parameter envelope.

QTM452T1 (QT Brightek): Primary component with 1118 units in stock. Supplied in Tape & Reel packaging. Turn-on time of 350ns and turn-off time of 300ns. Forward voltage of 1.45V.

HCPL-M452-500E (Broadcom Limited): Parametric equivalent with 1207 units in stock. Supplied in Cut Tape & Digi-Reel format. Turn-on time of 200ns and turn-off time of 600ns. Forward voltage of 1.5V. Faster turn-on response compared to QTM452T1.

HCPL-M453-500E (Broadcom Limited): Parametric equivalent with 64999 units in stock. Supplied in Cut Tape & Digi-Reel format. Turn-on time of 200ns and turn-off time of 600ns. Forward voltage of 1.5V. Highest inventory availability.

All three parts satisfy the electrical and mechanical requirements for direct substitution within applications designed for 3750Vrms single-channel optoisolator transistor output devices in 6-SOIC packages.

Frequently Asked Questions (FAQ)

Q: Can HCPL-M452-500E or HCPL-M453-500E be used as direct replacements for QTM452T1?

A: Yes. Both Broadcom parts meet all specified electrical parameters (isolation voltage, current transfer ratio, output voltage, output current, forward current, and operating temperature range) and mechanical parameters (6-SOIC package, 5 leads, surface mount). All three components are RoHS3 compliant with MSL 1 rating.

Q: What are the timing differences between QTM452T1 and the Broadcom substitutes?

A: QTM452T1 has a turn-on time of 350ns and turn-off time of 300ns. Both HCPL-M452-500E and HCPL-M453-500E have a turn-on time of 200ns and turn-off time of 600ns. These timing variations remain within the functional envelope for optoisolator applications but should be evaluated for circuits with specific timing-critical requirements.

Q: Are there packaging format differences between these parts?

A: QTM452T1 is supplied in Tape & Reel (TR) packaging. HCPL-M452-500E and HCPL-M453-500E are supplied in Cut Tape (CT) & Digi-Reel format. Both packaging formats are suitable for surface mount assembly; selection depends on production equipment and handling preferences.

Q: What is the difference between HCPL-M452-500E and HCPL-M453-500E?

A: Both parts are electrically and mechanically identical with matching electrical parameters and package specifications. The primary difference is inventory availability: HCPL-M453-500E has significantly higher stock (64999 units) compared to HCPL-M452-500E (1207 units).

Q: Do all three parts have the same forward voltage specification?

A: QTM452T1 has a typical forward voltage of 1.45V. Both HCPL-M452-500E and HCPL-M453-500E have a typical forward voltage of 1.5V. This 0.05V difference is within normal component tolerance and does not affect functional substitution.

Q: Are there any compliance or regulatory differences between these parts?

A: No. All three components are RoHS3 compliant, REACH unaffected, and carry the same ECCN (EAR99) and HTSUS (8541.49.8000) classifications. Moisture sensitivity level is 1 (Unlimited) for all parts.