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PUMH1/DG/B4X
Electronics Part Number
PUMH1/DG/B4X-WXManufacturer
STMicroelectronics
PUMH1/DG/B4X
Description
Pre-Biased 2NPN Transistor 50V 6TSSOPInventory
777 Pcs New Original In Stock
6-TSSOP pre-biased dual NPN; 50V, 100mA, 230MHz, 300mW; built-in resistors reduce parts count; for logic gates and switching circuits.
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Basic cost: USD 70.00
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Technical Specifications
Category
Memory, Batteries
Manufacturer
STMicroelectronics
Packaging
Tube
Operating Temperature
-40°C ~ 85°C
Mounting Type
Snap-In
Package / Case
Snaphat®
Series
Snaphat®
Base Product Number
M4Z28
Product Status
Active
Function
Back-Up Management
Supplier Device Package
Snaphat®
Battery Chemistry
Lithium
Shipping Info
Due to restrictions, only ground shipment is allowed.
Data Sheet Document (D)
Datasheets
Download M4Z28-BR00SH1 Product Specification (PDF)
HTML Datasheet
M4Z28-BR00SH1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8504.40.9580
Additional Information
Other Names
497-3689-5-NDR M4Z28BR00SH1 497-3689-5
Standard Package
23
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Frequently Asked Questions (FAQ)
What are the key design-in risks when integrating the M4Z28-BR00SH1 Snaphat® battery module into a p
When integrating the M4Z28-BR00SH1 in high-temperature environments close to its 85°C operating limit, the primary risk is accelerated lithium battery degradation, which can reduce backup runtime and lifespan. Even though the device is rated for this temperature, sustained operation above 70°C can increase self-discharge and raise failure risks over time. To mitigate this, ensure thermal management through PCB layout techniques—such as placing the module away from heat sources (e.g., regulators, power MOSFETs) and using thermal vias to dissipate local heat. Additionally, monitor long-term drift in battery voltage under load during qualification testing to validate reliability in your specific use case.
Can the M4Z28-BR00SH1 be used as a drop-in replacement for custom lithium backup solutions in legacy
The M4Z28-BR00SH1 can replace discrete lithium backup circuits in many legacy designs, but its Snaphat® snap-in package requires matching cutouts and retention features on the PCB. Unlike standard ICs, the module relies on mechanical stability from the snap-in design, so ensure your board includes the correct 28-SOIC footprint with proper standoffs and alignment features per STMicroelectronics' mechanical drawings. Also confirm that the 48mAh capacity meets runtime needs—systems previously using larger coin cells (e.g., CR2032) may experience shorter backup durations. Verify voltage regulation compatibility, as the M4Z28-BR00SH1 includes integrated management, unlike raw battery setups.
How does the M4Z28-BR00SH1 compare to the Maxim MAX6902-based backup modules in terms of integration
Compared to Maxim MAX6902-based designs that require external lithium batteries and discrete charge control, the M4Z28-BR00SH1 offers higher integration by combining the battery and backup management in a single Snaphat® package. This reduces bill-of-materials complexity and eliminates risks from mismatched battery charging profiles. The M4Z28-BR00SH1’s factory-sealed lithium cell also avoids manual battery insertion, improving reliability in automated manufacturing. However, unlike discrete solutions where the battery can be replaced, the M4Z28-BR00SH1’s sealed design means the entire module must be replaced at end-of-life—plan for field serviceability or extended warranty implications.
What are the reliability concerns with the M4Z28-BR00SH1 in industrial applications exposed to therm
In industrial environments with severe thermal cycling, the M4Z28-BR00SH1 must contend with mechanical stress from CTE (coefficient of thermal expansion) mismatches between the Snaphat® housing and the PCB. Although rated for -40°C to 85°C, repeated cycling can weaken snap-in retention or lead to solder joint fatigue. To improve reliability, use compliant mounting techniques such as placing the module near the PCB center (to reduce flex) and supporting with adhesive underfill if vibration is present. Also, avoid conformal coating over the snap-in contacts unless specified, as trapped moisture or stress may affect long-term connectivity.
What design trade-offs should be considered when choosing between the M4Z28-BR00SH1 and higher-capac
The M4Z28-BR00SH1 provides 48mAh in a compact 28-SOIC Snaphat® footprint, but solutions like the Abracon AB-1805 offer up to 100mAh in similar form factors. The trade-off centers on runtime vs. long-term availability and integration. The M4Z28-BR00SH1’s integrated circuitry simplifies compliance with battery-in-transit regulations (e.g., UN38.3) and avoids additional protection components. However, if your SRAM or real-time clock requires extended backup (e.g., >72 hours), the AB-1805 may be better. Conversely, the M4Z28-BR00SH1 benefits from STMicroelectronics’ active status and supply chain stability, reducing obsolescence risk—critical in long-lifecycle industrial designs.
What are the key design-in risks when integrating the M4Z28-BR00SH1 Snaphat® battery module into a p
When integrating the M4Z28-BR00SH1 in high-temperature environments close to its 85°C operating limit, the primary risk is accelerated lithium battery degradation, which can reduce backup runtime and lifespan. Even though the device is rated for this temperature, sustained operation above 70°C can increase self-discharge and raise failure risks over time. To mitigate this, ensure thermal management through PCB layout techniques—such as placing the module away from heat sources (e.g., regulators, power MOSFETs) and using thermal vias to dissipate local heat. Additionally, monitor long-term drift in battery voltage under load during qualification testing to validate reliability in your specific use case.
Can the M4Z28-BR00SH1 be used as a drop-in replacement for custom lithium backup solutions in legacy
The M4Z28-BR00SH1 can replace discrete lithium backup circuits in many legacy designs, but its Snaphat® snap-in package requires matching cutouts and retention features on the PCB. Unlike standard ICs, the module relies on mechanical stability from the snap-in design, so ensure your board includes the correct 28-SOIC footprint with proper standoffs and alignment features per STMicroelectronics' mechanical drawings. Also confirm that the 48mAh capacity meets runtime needs—systems previously using larger coin cells (e.g., CR2032) may experience shorter backup durations. Verify voltage regulation compatibility, as the M4Z28-BR00SH1 includes integrated management, unlike raw battery setups.
How does the M4Z28-BR00SH1 compare to the Maxim MAX6902-based backup modules in terms of integration
Compared to Maxim MAX6902-based designs that require external lithium batteries and discrete charge control, the M4Z28-BR00SH1 offers higher integration by combining the battery and backup management in a single Snaphat® package. This reduces bill-of-materials complexity and eliminates risks from mismatched battery charging profiles. The M4Z28-BR00SH1’s factory-sealed lithium cell also avoids manual battery insertion, improving reliability in automated manufacturing. However, unlike discrete solutions where the battery can be replaced, the M4Z28-BR00SH1’s sealed design means the entire module must be replaced at end-of-life—plan for field serviceability or extended warranty implications.
What are the reliability concerns with the M4Z28-BR00SH1 in industrial applications exposed to therm
In industrial environments with severe thermal cycling, the M4Z28-BR00SH1 must contend with mechanical stress from CTE (coefficient of thermal expansion) mismatches between the Snaphat® housing and the PCB. Although rated for -40°C to 85°C, repeated cycling can weaken snap-in retention or lead to solder joint fatigue. To improve reliability, use compliant mounting techniques such as placing the module near the PCB center (to reduce flex) and supporting with adhesive underfill if vibration is present. Also, avoid conformal coating over the snap-in contacts unless specified, as trapped moisture or stress may affect long-term connectivity.
What design trade-offs should be considered when choosing between the M4Z28-BR00SH1 and higher-capac
The M4Z28-BR00SH1 provides 48mAh in a compact 28-SOIC Snaphat® footprint, but solutions like the Abracon AB-1805 offer up to 100mAh in similar form factors. The trade-off centers on runtime vs. long-term availability and integration. The M4Z28-BR00SH1’s integrated circuitry simplifies compliance with battery-in-transit regulations (e.g., UN38.3) and avoids additional protection components. However, if your SRAM or real-time clock requires extended backup (e.g., >72 hours), the AB-1805 may be better. Conversely, the M4Z28-BR00SH1 benefits from STMicroelectronics’ active status and supply chain stability, reducing obsolescence risk—critical in long-lifecycle industrial designs.
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Sep 15 2026
