AUT:H - NiMH 1.2V 2.45Ah A-Cell Battery | Fujitsu
MPN: AUT:H β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.3 | $1,150.00 |
| 1,000 | $2.05 | $2,050.00 |
Drop-in alternatives for AUT:H β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
HR-AUT
β Drop-Inπ Reference alternative (not in catalog)
AUT:H Maximum Ratings & Electrical Characteristics
| Product Type | Rechargeable NiMH battery cell (HR-AUT family) |
| Battery Cell Size | A |
| Voltage - Rated | 1.2 V |
| End-of-Discharge Voltage | 1.00 V |
| Capacity | 2.45 Ah at 490 mA discharge |
| Chemistry | Nickel-Metal Hydride (NiMH) |
| Termination Style | Solder Tab |
| Rechargeable | Yes (secondary cell) |
| Standard Charge Method | Standard charge current and time per manufacturer datasheet |
| Mounting Type | Weld/solder tab pack assembly |
| RoHS Status | unknown |
AUT:H standard Pin Configuration Guide
Complete pinout information for AUT:H (standard package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for AUT:H.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AUT:H is suitable for 6 applications: Emergency Lighting Packs, Industrial Instrumentation Backup, Portable Test & Measurement Equipment, Telecom & Memory Backup Sub-Packs, Consumer & DIY Power Tools (Light Duty), Medical & Home Health Devices.
Emergency Lighting Packs
The AUT:H / HR-AUT fits emergency and exit-sign lighting packs because its 2.45 Ah capacity at a modest 490 mA reference discharge covers the mandated 60-90 minute runtime windows typical of emergency luminaires. The 1.2 V flat NiMH discharge plateau keeps lamp or LED-driver input voltage stable from full charge down to the 1.00 V end voltage, so luminous output does not fall off abruptly. Solder-tab termination permits series strings of three to ten cells (3.6 V to 12 V nominal) spot-welded into reliable packs that survive years on continuous trickle maintenance charge. Compared with primary cells, the rechargeable NiMH chemistry reduces total cost of ownership in devices exercised monthly during grid-failure tests.
Recommended
Industrial Instrumentation Backup
Portable industrial instruments - data loggers, gas detectors, handheld meters - benefit from the HR-AUT's combination of 2.45 Ah capacity, rugged A-cell construction, and safe aqueous NiMH chemistry that poses no thermal-runaway risk in field service. The solder-tab termination allows the battery to be integrated directly into the instrument's power PCB or pack bracket, resisting vibration better than spring-contact consumer cells. With a nominal 1.2 V and 1.00 V end voltage per the manufacturer datasheet, designers can build simple step-up regulators with a well-defined cutoff threshold. NiMH cells also tolerate the frequent partial charge/discharge cycling typical of instruments returned to a charging cradle daily.
Recommended
Portable Test & Measurement Equipment
Handheld and bench-portable test equipment draws tens to hundreds of milliamps, which aligns well with the HR-AUT's rated 490 mA discharge condition - at this rate the full 2.45 Ah is available, giving 5+ hours of continuous operation per charge. NiMH's low internal resistance supports brief measurement-burst loads without excessive voltage sag. Because solder-tab packs can be rebuilt cell-by-cell, service departments can refresh aging instrument packs using the same A-cell format rather than replacing proprietary lithium packs. The chemistry's tolerance to over-discharge during forgotten-equipment events is also more forgiving than lithium-ion, protecting long-term fleet reliability of test assets.
Recommended
Telecom & Memory Backup Sub-Packs
Telecom shelves and industrial controllers frequently need a short-ride-through battery for memory retention, real-time clocks, and controlled shutdown. Strings of HR-AUT A-cells (five to ten cells for 6-12 V nominal) deliver reliable ride-through at moderate currents, and NiMH's long calendar life on maintenance trickle charge suits always-connected equipment. The solder-tab construction supports welded, service-proof assemblies that meet industrial reliability expectations, while the absence of lithium transport restrictions simplifies spares logistics across sites. Designers should terminate discharge at 1.00 V per cell and use temperature-sensed charging, per the manufacturer datasheet guidance, to maximize the multi-year service interval.
Recommended
Consumer & DIY Power Tools (Light Duty)
Light-duty cordless devices - electric screwdrivers, hobby tools, garden lighting - can use HR-AUT packs where legacy NiCd packs are being replaced. The 2.45 Ah A-cell offers roughly double the capacity of an AA NiCd and the NiMH chemistry eliminates cadmium, simplifying environmental compliance. Solder tabs allow direct re-creation of original pack geometries with spot-welded nickel strips. Note the trade-off: NiMH has slightly higher internal resistance than modern Li-ion and needs a NiMH-specific charger (-deltaV or temperature cutoff), so do not substitute into chargers designed for other chemistries. The 1.2 V per-cell voltage matches original NiCd tool motor design points without BMS complexity.
Recommended
Medical & Home Health Devices
Portable medical and home-health devices - thermometers, blood-pressure monitors, nebulizer pumps - value the HR-AUT's proven, vented, non-flammable NiMH chemistry and predictable 1.2 V discharge. Solder-tab A-cells can be assembled into packs that are replaced during routine preventive maintenance, and the 2.45 Ah capacity supports multiple pump cycles or days of monitoring between charges. NiMH's tolerance of frequent top-up charging matches the usage pattern of devices kept on chargers between patient uses. The chemistry contains no cadmium or lead, easing regulatory and disposal discussions, though formal RoHS declarations should be confirmed with FDK for the specific lot before clinical deployment.
Recommended
Recommended Products Summary
Engineering reference data for AUT:H β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HR-AUT | HR-AAUTEWM |
|---|---|---|---|
| Package | A-size cylindrical, solder tab | A-size cylindrical, solder tab - same | AA-size cylindrical, solder tab - smaller |
| Brand | Fujitsu / FDK America | Fujitsu / FDK America | Fujitsu / FDK America |
| Nominal Voltage | 1.2 V | 1.2 V | 1.2 V |
| Capacity | 2.45 Ah @ 490 mA | 2.45 Ah @ 490 mA | [DATA_NEEDED] |
| End-of-Discharge Voltage | 1.00 V | 1.00 V | 1.00 V |
| Chemistry | NiMH | NiMH | NiMH |
| Termination | Solder Tab | Solder Tab | Solder Tab |
| Drop-in Fit for A-cell Packs | Reference part | Yes (identical resolved part) | No - AA size requires holder redesign |
Key Differentiators
- High A-cell capacity for its format (vs HR-AAUTEWM)
- Solder-tab termination enables reliable packs (vs HR-AAUTEWM)
- Safe aqueous chemistry with no lithium transport restrictions (vs Li-ion A-format cells)
Design Notes
Define the charge profile before finalizing the pack. For HR-AUT class NiMH A-cells, use a constant-current standard charge (typically 0.1C for 14-16 hours) or a rapid charge supervised by -deltaV detection and a cell-surface temperature cutoff (approximately 45-50 C). Never float-charge NiMH at a fixed voltage like lead-acid or Li-ion; sustained overcharge dries the electrolyte and shortens cycle life. Confirm exact standard-charge current and time against the full FDK HR-AUT datasheet before certifying a charger.
Terminate discharge at 1.00 V per cell as the datasheet specifies. In series strings, a single weaker cell can be driven into reversal during deep discharge, causing permanent capacity loss and venting risk. Add a pack-level low-voltage cutoff at 1.0 V x cell count, and where possible match cells by capacity and internal resistance from the same manufacturing lot. Avoid mixing NiMH with NiCd or fresh with aged cells in one pack.
For solder-tab cells, prefer spot-welded nickel strips over hand-soldering directly to tabs; prolonged iron contact heats the cell seal and can damage the vent. If hand-soldering is unavoidable, use a hot iron briefly with flux and pre-tinned tabs, keeping contact under a few seconds. Provide strain relief on tab leads and allow mechanical clearance for the pressure-relief vent region of the cell. Maintain insulation between adjacent cells to prevent abrasion shorts in vibrating equipment.
Capacity ratings such as 2.45 Ah at 490 mA assume room-temperature discharge. Estimated derating: at 0 C expect noticeably reduced usable capacity, and at high continuous discharge rates above the 490 mA reference the delivered capacity drops further due to internal resistance losses. Place temperature sensors against the cell body for charge termination and locate packs away from heat sources such as power supplies or motors to preserve calendar life.
Compliance Information
Compliance declarations were not present in the verified web data. NiMH chemistry contains no cadmium or lead, but formal RoHS/REACH status must be confirmed with FDK America (a member of the Fujitsu Group).
