QTM453T1 Equivalent & Substitute Parts Reference

Part Overview

The QTM453T1 is an optoisolator with transistor output manufactured by QT Brightek (QTB). This single-channel device provides 3750Vrms isolation voltage and is designed for applications requiring galvanic isolation with DC input and transistor output configuration. The component is currently in active product status with 1075 pieces available in inventory. Substitute parts are identified based on matching electrical specifications, isolation voltage ratings, output characteristics, and mechanical compatibility within the optoisolator category.

Substiute Parts

QTM453T1

QT Brightek (QTB)In Stock: 1167QTM453T1 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 QTM453T1 are qualified based on the following critical parameters that determine functional equivalence:

Isolation Voltage: 3750Vrms (exact match required)

Number of Channels: 1 (single-channel configuration)

Output Type: Transistor (DC input, transistor output topology)

Current Transfer Ratio Range: 20% to 50% @ 16mA (defines gain characteristics)

Maximum Output Voltage: 20V (output stage voltage rating)

Output Current per Channel: 8mA (current handling capacity)

Operating Temperature Range: -55°C ~ 100°C (thermal operating window)

Package Configuration: 6-SOIC with 5 leads, 0.173" width, 4.40mm width (mechanical and electrical pin compatibility)

Mounting Type: Surface Mount (PCB assembly compatibility)

Regulatory Compliance: ROHS3 Compliant, REACH Unaffected, MSL 1 (environmental and handling requirements)

The identified substitute parts match all critical electrical parameters and mechanical specifications. Variations in turn-on/turn-off timing and forward voltage are within acceptable tolerance ranges for this component category and do not affect functional substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

All three parts—QTM453T1, HCPL-M452-500E, and HCPL-M453-500E—are active products with current manufacturing status and full regulatory compliance (ROHS3, REACH Unaffected). Selection between these parts is based on availability and supply chain considerations rather than functional differences.

Availability Considerations:

HCPL-M453-500E (Broadcom) offers the highest inventory availability at 64,999 pieces, followed by HCPL-M452-500E (Broadcom) at 1,207 pieces, and QTM453T1 (QTB) at 1,075 pieces. For applications requiring immediate procurement or high-volume orders, the HCPL-M453-500E provides superior supply assurance.

Packaging and Handling:

All parts share identical mechanical specifications (6-SOIC package, 5 leads, 0.173" width, 4.40mm width) and surface mount mounting type, ensuring direct PCB compatibility without layout modifications. Moisture sensitivity level 1 (unlimited) applies uniformly across all three parts, eliminating special storage or handling requirements.

Compliance and Regulatory Status:

All three parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements for industrial and commercial applications. No additional compliance verification is required for substitution.

Frequently Asked Questions (FAQ)

Q: Can HCPL-M452-500E or HCPL-M453-500E be used as direct replacements for QTM453T1?

A: Yes. Both Broadcom parts are parametric equivalents with matching isolation voltage (3750Vrms), single-channel configuration, transistor output type, current transfer ratio range (20-50% @ 16mA), maximum output voltage (20V), output current (8mA), and operating temperature range (-55°C ~ 100°C). Package and pin configurations are identical.

Q: What are the differences in switching timing between these parts?

A: QTM453T1 has turn-on time of 350ns and turn-off time of 300ns. Both HCPL-M452-500E and HCPL-M453-500E have turn-on time of 200ns and turn-off time of 600ns. These timing variations are within acceptable tolerance for optoisolator applications and do not affect functional substitution in standard isolation circuits.

Q: Are there any differences in forward voltage specifications?

A: QTM453T1 has typical forward voltage (Vf) of 1.45V, while both Broadcom substitutes specify 1.5V. This 0.05V difference is negligible for circuit design purposes and does not require input circuit modifications.

Q: Do all three parts require the same PCB footprint?

A: Yes. All parts use the 6-SOIC package with 5 leads, 0.173" width, and 4.40mm width. PCB layouts designed for any one of these parts are directly compatible with the others without modification.

Q: What is the moisture sensitivity level for these parts?

A: All three parts have Moisture Sensitivity Level (MSL) 1, which indicates unlimited shelf life and no special moisture control requirements during storage or handling.

Q: Are there supply chain advantages to selecting one substitute over another?

A: HCPL-M453-500E (Broadcom) has significantly higher inventory availability (64,999 pieces) compared to HCPL-M452-500E (1,207 pieces) and QTM453T1 (1,075 pieces). For applications requiring high-volume procurement or extended lead time protection, HCPL-M453-500E provides superior supply assurance.

Q: Do all parts meet the same regulatory and compliance standards?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry identical environmental and regulatory certifications. No additional compliance verification is required when substituting between these parts.