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MX856B Equivalent & Substitute Parts
Part Overview
The MX856B is a voltage level translator manufactured by IXYS Integrated Circuits Division, designed for unidirectional signal translation between different voltage domains. This 8-SOIC package device translates signals from a 3V to 3.6V supply (VCCA) to a 7.5V to 20V supply (VCCB) with differential output capability. The product is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MX856B |
| Manufacturer | IXYS Integrated Circuits Division |
| Category | Logic |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Translator Type | Voltage Level |
| Channel Type | Unidirectional |
| Number of Circuits | 1 |
| Channels per Circuit | 1 |
| Voltage - VCCA | 3 V ~ 3.6 V |
| Voltage - VCCB | 7.5 V ~ 20 V |
| Output Type | Differential |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the MX856B is determined by the following critical parameters:
Primary Substitution Criteria:
- Translator Type: Voltage Level
- Channel Type: Unidirectional
- Number of Circuits: 1
- Channels per Circuit: 1
- Operating Temperature Range: -40°C ~ 85°C minimum
- Mounting Type: Surface Mount
Voltage Domain Compatibility: The MX856B operates with VCCA at 3V to 3.6V and VCCB at 7.5V to 20V. Substitute parts must support these voltage ranges or provide equivalent functionality within overlapping ranges.
Output Configuration: The differential output type of the MX856B is a defining characteristic. Substitutes with push-pull or tri-state outputs represent functional alternatives for unidirectional translation applications.
Package Considerations: While the original 8-SOIC package is specified, equivalent functionality is available in alternative surface-mount packages including 6-XSON, 5-TSSOP, 5-X2SON, and SOT-23-6 formats.
Parameter Comparison
| Part Number | Manufacturer | Translator Type | Channel Type | Circuits | Channels/Circuit | VCCA Range | VCCB Range | Output Type | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MX856B | IXYS | Voltage Level | Unidirectional | 1 | 1 | 3V ~ 3.6V | 7.5V ~ 20V | Differential | -40°C ~ 85°C | 8-SOIC | Obsolete |
| 74AUP1T34GM,132 | NXP USA Inc. | Buffer | Unidirectional | 1 | 1 | 1.1V ~ 3.6V | 1.1V ~ 3.6V | Push-Pull | -40°C ~ 125°C | 6-XSON (1.45x1) | Active |
| 74AUP1T34GN,132 | NXP USA Inc. | Buffer | Unidirectional | 1 | 1 | 1.1V ~ 3.6V | 1.1V ~ 3.6V | Push-Pull | -40°C ~ 125°C | 6-XSON (0.9x1) | Active |
| 74AUP1T34GW,125 | Nexperia USA Inc. | Buffer | Unidirectional | 1 | 1 | 1.1V ~ 3.6V | 1.1V ~ 3.6V | Push-Pull | -40°C ~ 125°C | 5-TSSOP | Active |
| 74AUP1T34GXH | NXP USA Inc. | Buffer | Unidirectional | 1 | 1 | 1.1V ~ 3.6V | 1.1V ~ 3.6V | Push-Pull | -40°C ~ 125°C | 5-X2SON (0.80x0.80) | Active |
| 74AXP1T125GMH | Nexperia USA Inc. | Voltage Level | Unidirectional | 1 | 1 | 0.7V ~ 2.75V | 1.2V ~ 5.5V | Tri-State | -40°C ~ 85°C | 6-XSON (1.45x1) | Obsolete |
| 74AXP1T125GNH | Nexperia USA Inc. | Voltage Level | Unidirectional | 1 | 1 | 0.7V ~ 2.75V | 1.2V ~ 5.5V | Tri-State | -40°C ~ 85°C | 6-XSON (0.9x1) | Obsolete |
| 74AXP1T34GNH | Nexperia USA Inc. | Buffer | Unidirectional | 1 | 1 | 0.7V ~ 2.75V | 0.7V ~ 2.75V | Push-Pull | -40°C ~ 85°C | 6-XSON (0.9x1) | Obsolete |
| 74AXP1T34GXH | Nexperia USA Inc. | Buffer | Unidirectional | 1 | 1 | 0.7V ~ 2.75V | 0.7V ~ 2.75V | Push-Pull | -40°C ~ 85°C | 5-X2SON (0.80x0.80) | Obsolete |
| ADG3231BRJZ-REEL7 | Analog Devices Inc. | Voltage Level | Unidirectional | 1 | 1 | 1.65V ~ 3.6V | 1.65V ~ 3.6V | Non-Inverted | -40°C ~ 85°C | SOT-23-6 | Active |
| FXLP34P5X | onsemi | Voltage Level | Unidirectional | 1 | 1 | 1V ~ 3.6V | 1V ~ 3.6V | Non-Inverted | -40°C ~ 85°C | 5-TSSOP | Active |
Engineering Selection Recommendations
Active Status Preference: For new designs, prioritize active-status parts: 74AUP1T34GM,132, 74AUP1T34GN,132, 74AUP1T34GW,125, 74AUP1T34GXH, ADG3231BRJZ-REEL7, and FXLP34P5X. These parts offer long-term availability and manufacturing support.
Voltage Range Considerations: The MX856B operates at higher VCCB voltages (7.5V to 20V) compared to most active substitutes. The 74AUP1T34 series and FXLP34P5X operate at 1.1V to 3.6V, suitable for single-supply applications. The ADG3231BRJZ-REEL7 supports 1.65V to 3.6V on both supplies. For applications requiring the original 7.5V to 20V VCCB range, the 74AXP1T125 series (though obsolete) maintains this capability.
Compliance and Certifications: All substitute parts carry REACH Unaffected and EAR99 ECCN classifications, matching the original part's regulatory status. Active parts include ROHS3 compliance certification. Moisture sensitivity remains at MSL 1 (Unlimited) across all options.
Package Selection: The 74AUP1T34GW,125 in 5-TSSOP package and FXLP34P5X in SC-70-5 provide the closest footprint compatibility for board-level retrofitting. The 6-XSON variants (74AUP1T34GM,132 and 74AUP1T34GN,132) offer compact alternatives. The 5-X2SON packages (74AUP1T34GXH and 74AXP1T34GXH) provide the smallest form factor.
Frequently Asked Questions (FAQ)
Q: Can the 74AUP1T34 series directly replace the MX856B?
A: The 74AUP1T34 series provides unidirectional buffer functionality with push-pull output in active production status. However, the voltage supply ranges differ significantly. The 74AUP1T34 operates at 1.1V to 3.6V on both supplies, whereas the MX856B supports 7.5V to 20V on VCCB. Application-specific voltage requirements determine compatibility.
Q: What is the difference between the 74AUP1T34 and 74AXP1T34 series?
A: The 74AUP1T34 series is active production with 1.1V to 3.6V supply range and 4mA output current. The 74AXP1T34 series is obsolete with 0.7V to 2.75V supply range and 12mA output current. The 74AXP1T34 provides higher output drive capability but is no longer manufactured.
Q: Is the ADG3231BRJZ-REEL7 suitable for high-speed applications?
A: The ADG3231BRJZ-REEL7 is specified for 10Mbps data rate operation with short-circuit protection. It operates at 1.65V to 3.6V on both supplies. This part is appropriate for moderate-speed unidirectional translation applications within its voltage specifications.
Q: What package options are available for space-constrained designs?
A: The 5-X2SON (0.80x0.80) packages—74AUP1T34GXH and 74AXP1T34GXH—provide the smallest footprint. The 5-TSSOP packages—74AUP1T34GW,125 and FXLP34P5X—offer a balance between size and ease of hand assembly.
Q: Are all substitute parts RoHS compliant?
A: Active-status parts (74AUP1T34 series, ADG3231BRJZ-REEL7, FXLP34P5X) carry ROHS3 compliance certification. Obsolete parts (74AXP1T125 and 74AXP1T34 series) also include ROHS3 compliance. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating.
Q: Which substitute is recommended for new production designs?
A: For new designs requiring unidirectional voltage translation with active manufacturer support, the 74AUP1T34GW,125 (5-TSSOP) or 74AUP1T34GXH (5-X2SON) from NXP are recommended. Both are in active production with extended temperature range (-40°C to 125°C) and multiple package options. For applications requiring voltage level translation with integrated protection, the ADG3231BRJZ-REEL7 from Analog Devices offers 10Mbps data rate capability and short-circuit protection.
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