BQ48SH-28X6NSH - 48mAh 2.8V SNAPHAT | Texas Instruments
Référence : BQ48SH-28X6NSH ✓ ActifBQ48SH-28X6NSH Présentation
A SNAPHAT is a battery-backed clock module rather than a conventional battery-management IC. It belongs to the real-time-clock backup module hierarchy, combining a lithium coin cell, watch crystal, and mechanical holder in one replaceable assembly. Its purpose is to preserve timekeeping and nonvolatile-memory backup information while protecting the crystal and battery from board-handling conditions that can occur during soldering or assembly.
The verified BQ48SH-28X6NSH features include a detachable unit that allows replacement, an integrated 6 pF watch crystal for real-time clock operation, a 48 mAh lithium coin cell, and a 2.8 V nominal battery voltage. Its 32.768 kHz frequency supports standard calendar-clock counting applications. The module is designed to attach after the compatible DSH-package base IC has been soldered, reducing assembly damage to the battery and crystal.
The SNAPHAT construction separates the precision timing and backup-power assembly from the soldered system IC. This arrangement is useful when the clock crystal and lithium cell must be protected during board-level assembly, while still allowing the battery/crystal assembly to be serviced separately after installation. The source documentation specifically identifies compatibility with BQ4802YDSH and BQ4802LYDSH parallel real-time-clock and NVSRAM controller packages.
Typical uses include industrial control equipment, data-acquisition systems, instrumentation, embedded controllers, and other clocked products that require retained time and memory backup. The 48 mAh lithium cell provides the stated backup-energy source, while the 32.768 kHz crystal provides the timebase used by the associated clock controller. Exact continuous-current capability, operating-temperature limits, and environmental ratings must be confirmed in the manufacturer datasheet.
The principal assembly consideration is to solder the base SOIC device before fitting the SNAPHAT unit. Avoid mechanical stress, high-temperature rework, and reflow procedures that expose the lithium cell to excessive heat. Confirm connector dimensions, retention method, battery orientation, and crystal compatibility against the target IC footprint before production assembly.
This page consolidates the verified distributor specification, manufacturer-linked PDF, compatibility information, purchasing data, and same-family alternatives. It also distinguishes documented parameters from information that still requires confirmation from the complete manufacturer datasheet, supporting faster sourcing and more reliable SNAPHAT selection.
Alternatives de remplacement direct pour BQ48SH-28X6NSH — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
BQ48SH-18X6NSH
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
BQ48SH-28X6
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
BQ48SH-48X6NSH
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
BQ48SH-58X6NSH
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
BQ48SH-68X6NSH
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
BQ48SH-28X6NSH Spécifications
| Product Type | SNAPHAT lithium clock battery and crystal module |
| Battery Chemistry | Lithium coin cell |
| Battery Capacity | 48 mAh |
| Battery Voltage | 2.8 V |
| Crystal Frequency | 32.768 kHz |
| Integrated Crystal Load | 6 pF |
| Timekeeping Function | Real-time clock backup |
| Replaceability | Detachable unit |
| Compatible Base ICs | BQ4802YDSH and BQ4802LYDSH |
| Base IC Package | SOIC (DSH) |
| Assembly Sequence | Attach after the base IC has been soldered |
| Clock Backup Function | Integrated watch crystal and lithium coin cell |
| NVSRAM Backup Support | Compatible with specified BQ4802 parallel real-time-clock and NVSRAM controllers |
Guide de configuration des broches du BQ48SH-28X6NSH soic (dsh)
Configuration des broches du BQ48SH-28X6NSH (boîtier soic (dsh)). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour BQ48SH-28X6NSH.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
BQ48SH-28X6NSH convient pour 6 applications: Industrial Real-Time-Clock Backup, Data-Acquisition Timestamp Retention, Instrumentation and Test Equipment, Embedded Control Systems, Network and Communication Equipment, Battery-Backed Memory Systems.
Industrial Real-Time-Clock Backup
The BQ48SH-28X6NSH suits industrial equipment that uses a BQ4802YDSH or BQ4802LYDSH for calendar and backup functions. Its integrated 32.768 kHz watch crystal provides the timebase, while the 48 mAh lithium coin cell supports nonvolatile-memory backup. According to the manufacturer-linked documentation, attaching the detachable SNAPHAT after soldering the base SOIC IC protects the battery and crystal from assembly heat. Designers should verify operating-temperature limits and expected backup current because those values were not present in the verified excerpts.
Recommandé
Data-Acquisition Timestamp Retention
The BQ48SH-28X6NSH can maintain timing and backup power for data-acquisition equipment built around the documented BQ4802 controller family. The 32.768 kHz crystal supplies a standard low-frequency timebase, and the 48 mAh lithium cell supplies the stated backup capacity. The detachable construction is valuable when the base IC must be soldered before the lithium battery and crystal are installed, reducing exposure to reflow. Exact runtime depends on the controller load and must be calculated from current data not supplied in the verified excerpt.
Recommandé
Instrumentation and Test Equipment
For instrumentation requiring traceable events and retained configuration, the BQ48SH-28X6NSH combines the timing and backup functions in one protected assembly. Its documented 32.768 kHz crystal and 6 pF load align with the BQ4802 real-time-clock controllers named in the manufacturer documentation. The 48 mAh lithium cell provides the source specified for backup rather than general system power. Engineers should confirm the holder dimensions, retention method, and calendar accuracy before integrating it into a laboratory or field instrument.
Recommandé
Embedded Control Systems
The BQ48SH-28X6NSH is appropriate for embedded control systems that require a separate real-time-clock or NVSRAM backup path around a compatible BQ4802 device. Its 32.768 kHz watch crystal supports calendar-clock operation, while the detachable lithium-and-crystal assembly separates timekeeping hardware from the soldered base IC. The 48 mAh capacity is specified for the backup cell, but available operating duration still depends on load current, temperature, and battery behavior. Those operating details require confirmation from the complete manufacturer datasheet.
Recommandé
Network and Communication Equipment
Network appliances and communication equipment can use the BQ48SH-28X6NSH when their clock subsystem requires a protected battery-backed time source. The module’s 32.768 kHz crystal and 48 mAh lithium cell are specifically documented, and the manufacturer PDF identifies compatibility with BQ4802YDSH and BQ4802LYDSH controllers. The assembly should be installed only after the base IC soldering operation to avoid applying assembly heat and mechanical stress to the battery or crystal. Network-level timestamp accuracy must be checked against the complete RTC and calibration specifications.
Recommandé
Battery-Backed Memory Systems
The BQ48SH-28X6NSH supports systems in which a BQ4802 controller manages NVSRAM backup and real-time-clock operation. Its 48 mAh lithium coin cell provides the documented backup source, and the integrated 32.768 kHz watch crystal provides the timing reference. Because the SNAPHAT is detachable and intended for attachment after base-IC soldering, it supports serviceable assembly practices that protect the precision timing element. Before upgrading an existing board, verify the base MPN, holder geometry, battery orientation, and crystal load against the mechanical drawing.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour BQ48SH-28X6NSH — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | BQ48SH-18X6NSH | BQ48SH-28X6 | BQ48SH-48X6NSH | BQ48SH-58X6NSH | BQ48SH-68X6NSH |
|---|---|---|---|---|---|---|
| Package | SNAPHAT module | SNAPHAT module | SNAPHAT module | SNAPHAT module | SNAPHAT module | SNAPHAT module |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Battery Type | Lithium coin cell | Lithium coin cell | Lithium coin cell | Lithium coin cell | Lithium coin cell | Lithium coin cell |
| Battery Voltage | 2.8 V | 2.8 V | 2.8 V | 2.8 V | 2.8 V | 2.8 V |
| Crystal Frequency | 32.768 kHz | 32.768 kHz | 32.768 kHz | 32.768 kHz | 32.768 kHz | 32.768 kHz |
| Integrated Crystal Load | 6 pF | 6 pF | 6 pF | 6 pF | 6 pF | 6 pF |
| Detachable Construction | Yes | Yes | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Integrated timing and backup power in a detachable module (vs BQ4802YDSH)
- Protected assembly sequence (vs Discrete crystal and battery implementation)
- Defined timing load and frequency (vs Unqualified watch crystal)
Notes de conception
According to the manufacturer-linked PDF, the SNAPHAT is designed to be attached only after the DSH-package base IC has been soldered. Reflowing or soldering the complete assembly before final installation can expose the lithium coin cell and precision crystal to excessive heat. Preserve the documented assembly sequence and avoid rework operations that apply direct heat to the SNAPHAT body or its battery contacts.
Verify the SNAPHAT mechanical drawing, holder orientation, and battery position against the selected BQ4802 footprint before PCB release. The supplied excerpts do not include dimensions or a complete numbered contact layout, so do not derive the footprint from the base IC pinout. Check that the holder clears nearby tall components and that its retention mechanism remains accessible for service without stressing the battery or crystal.
Calculate backup runtime from the controller and memory load, battery voltage, temperature, and the specified 48 mAh cell capacity. The verified excerpts do not provide continuous backup current, so a defensible runtime estimate cannot be produced from the available data. Include tolerance, end-of-life capacity, temperature effects, and the controller's backup behavior in the engineering budget before using the SNAPHAT for a safety- or compliance-critical timestamp function.
Informations de conformité
The supplied verified excerpts describe the electrical and mechanical function of the SNAPHAT but do not provide RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification evidence. AEC-Q100 is treated as not applicable because this is a clock battery and crystal module rather than an automotive semiconductor IC.
