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NXP Semiconductors MC33771BTA2AE
- Part No.:
- MC33771BTA2AE
- Manufacturer:
- NXP Semiconductors
- Category:
- Battery Management
- Package:
- 64-LQFP Exposed Pad
- Datasheet:
-
MC33771BTA2AE.pdf
- Description:
- IC BAT CNTRL LI-ION 7-14C 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,849
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Product details
Overview
MC33771BTA2AE from NXP Semiconductors is a TPL-based battery cell controller IC for automotive and industrial battery management systems, supporting 7–8 lithium-ion cells, performing differential cell voltage measurement (±0.7 mV error), current sensing with coulomb counting, and integrated 300 mA passive cell balancing. It operates across 9.6–63 V VPWR and is deployed in HEV/EV battery packs and energy storage systems.
For engineers reviewing the MC33771BTA2AE datasheet, MC33771BTA2AE pinout, MC33771BTA2AE application, or MC33771BTA2AE equivalent, key selection criteria include its TPL isolation interface (2.0 Mbps), ASIL D safety compliance per ISO 26262, −40 °C to +105 °C operating range, 64-pin LQFP-EP package, and support for precision temperature monitoring via seven GPIO/ANx inputs.
Technical Context
The MC33771BTA2AE implements synchronized 15-bit ADC conversion for up to eight cell voltages and bidirectional current measurement using an internal PGA with auto-ranging gain (4× to 256×). Its Transformer Isolation (TPL) interface enables daisy-chained communication across high-voltage battery stacks without galvanic coupling.
It integrates fault detection logic for open/shorted cell connections, VPWR overvoltage (65 V flag), VCOM undervoltage (4.4 V), thermal shutdown (170 °C), and configurable OV/UV thresholds per cell (default 4.2 V / 2.5 V). Sleep-mode monitoring maintains safety coverage while drawing only 68 µA in TPL idle mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | 7–8 cells - supports compact battery modules used in 48 V mild-hybrid systems and e-scooter packs. |
| Communication Interface | TPL (2.0 Mbps) - isolated differential bus enabling robust noise immunity and daisy-chain topology across stacked modules. |
| Voltage Measurement Error | ±0.7 mV (−40 °C to +105 °C) - ensures accurate state-of-charge estimation under full automotive temperature range. |
| Cell Balancing | 300 mA passive balancing per channel - dissipates excess energy during charge equalization without external FETs. |
| Safety Certification | ISO 26262 ASIL D compliant - validated for use in safety-critical BMS functions including fault detection and shutdown. |
| Supply Range | 9.6 V ≤ VPWR ≤ 63 V - covers 12 V auxiliary supply up to 60-cell Li-ion stacks (≈250 V nominal). |
| Operating Temperature | −40 °C to +105 °C - qualified per AEC-Q100 Grade 1 for under-hood and battery-pack mounting. |
Pinout & Package
MC33771BTA2AE uses a 64-pin LQFP-EP (exposed pad) package with 0.5 mm pitch, optimized for thermal dissipation in high-power battery monitoring applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VPWR1, VPWR2 | Primary power input | Dual-supply inputs tolerant to 75 V transients; enable redundancy and current sharing in high-reliability BMS designs. |
| CT_1–CT_8, CT_REF | Differential cell voltage inputs | Eight dedicated cell terminal inputs plus reference; support Kelvin-connected sensing for minimized PCB trace resistance error. |
| CB_1–CB_8, CB_n:n−1_C | Cell balance drivers | Eight independent NMOS drivers with 0.4 Ω RDS(on) at 25 °C; common-source outputs enable shared balancing resistors between adjacent cells. |
| RDTX_OUT+, RDTX_OUT−, SI/RDTX_IN+, SCLK/RDTX_IN− | TPL physical layer I/O | Full-duplex isolated differential pair for transformer-coupled communication; eliminates ground loops in multi-module stacks. |
| GPIO0–GPIO6 | Configurable analog/digital I/O | Seven pins support ratiometric temperature sensing (via NTC), wake-up triggers, or fault daisy-chaining - no external ADC required. |
| ISENSE+, ISENSE− | Current sense differential input | High-precision shunt-based current measurement with auto-zeroing and programmable PGA gain (4×–256×) for wide dynamic range. |
| FAULT | Open-drain fault output | Active-low signal asserting on internal/external faults (OV/UV, thermal, open line); supports wired-OR daisy-chain fault propagation. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer Isolation (TPL) | 2.0 Mbps daisy-chain communication with ±10 V common-mode tolerance - eliminates need for optocouplers or isolated DC/DC in multi-tier BMS. |
| Integrated Cell Balancing | On-chip 300 mA NMOS drivers with diagnostics - reduces bill-of-materials and PCB area versus discrete balancing solutions. |
| ASIL D Safety Architecture | Dual-core lockstep monitoring, memory ECC, voltage/temperature watchdogs, and fault-tolerant GPIO - meets ISO 26262 requirements without external safety MCU. |
| Low-Power Sleep Monitoring | 68 µA TPL idle current with continuous OV/UV and temperature checks - enables always-on safety supervision during vehicle off-state. |
| Configurable Precision GPIO | Seven pins support 12-bit ratiometric ANx measurements (±8 mV error) - allows direct NTC thermistor interfacing with <1 K error across −40 °C to +105 °C. |
Applications
| Automotive 48 V Mild-Hybrid Systems | E-Bikes and E-Scooters |
|---|---|
Use Scenario: Monitoring 8-cell 48 V Li-ion battery pack in start-stop and regenerative braking circuits. IC Role / Device Role / Timing Role: Primary cell voltage/current monitor and balancing controller; synchronizes measurements with MCU via TPL for real-time SoC/SoH calculation. Use Value: Enables precise charge control and thermal management within AEC-Q100 and ASIL D constraints, extending battery life by >15% vs. non-balanced operation. |
Use Scenario: Compact BMS for lightweight 36–48 V e-scooter battery packs with space-constrained enclosure. IC Role / Device Role / Timing Role: Standalone cell supervisor handling voltage, temperature, and current with integrated balancing - replaces multi-chip discrete solutions. Use Value: Reduces component count by 40% and PCB area by 35% while maintaining ±0.7 mV measurement accuracy across operating temperature range. |
| Energy Storage Systems (ESS) | Uninterruptible Power Supply (UPS) |
Use Scenario: Rack-level monitoring of 7–8 series LiFePO₄ or NMC cells in residential/commercial ESS units. IC Role / Device Role / Timing Role: Cluster-level cell controller communicating via TPL to central BMS; performs autonomous fault detection and reporting. Use Value: Supports hot-plug capability and stack-level diagnostics - cuts field service time by enabling module-level fault isolation without system shutdown. |
Use Scenario: High-reliability UPS with dual 8-cell Li-ion strings for datacenter backup power. IC Role / Device Role / Timing Role: Dual independent MC33771BTA2AE instances monitor each string; TPL interface enables inter-string communication for voltage matching. Use Value: Ensures balanced charging across parallel strings and detects cell-level failures before capacity degradation impacts runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery cell monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33771BTA1AE | Supports 7–14 cells; identical TPL interface, ASIL D compliance, and 64-pin LQFP-EP package. | Used in higher-cell-count EV traction batteries (e.g., 12–14S) where extended stack voltage requires more channels. | Select MC33771BTA1AE when scaling beyond 8 cells; same footprint and firmware compatibility simplify hardware reuse. |
| MC33772BTA2AE | 6-cell variant with SPI-only interface; shares same safety architecture and GPIO functionality but lacks TPL isolation. | Targeted at low-voltage (<30 V) applications like power tools or portable medical devices where isolation is not required. | Choose MC33772BTA2AE only for cost-sensitive, non-isolated 6-cell designs; not drop-in compatible due to pinout and communication differences. |
Compared with MC33771BTA1AE and MC33772BTA2AE, the MC33771BTA2AE uniquely balances 7–8 cells with transformer-isolated communication and full ASIL D support - making it optimal for compact, safety-critical 48 V automotive and micromobility BMS where isolation and thermal resilience are mandatory.
Availability
MC33771BTA2AE is available at Aetrix Electronics and suitable for automotive battery management, e-scooter power systems, and energy storage applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MC33771BTA2AE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in functional safety and high-voltage analog integration.
The MC33771BTA2AE belongs to NXP's SMARTMOS battery monitoring product line, engineered specifically for ASIL D-compliant, isolated BMS architectures in electric mobility and grid-scale storage systems.
FAQ
What communication protocol does the MC33771BTA2AE use?
The MC33771BTA2AE uses Transformer Isolation (TPL) communication at 2.0 Mbps, supporting daisy-chained, galvanically isolated data transmission across high-voltage battery stacks. It does not support SPI - that variant is designated with 'S' (e.g., MC33771BSA2AE). The TPL interface eliminates ground loops and simplifies multi-module BMS design without external isolators.
How many battery cells can the MC33771BTA2AE monitor?
The MC33771BTA2AE monitors 7 to 8 series-connected lithium-ion or lithium-iron-phosphate cells. This is defined by its part number suffix '2' (per Table 1 in the datasheet) and confirmed in Table 2, which lists MC33771BTA2AE explicitly under "7 to 8 channels". It is not configurable for more than eight cells.
Does the MC33771BTA2AE support integrated cell balancing?
Yes, the MC33771BTA2AE includes eight integrated 300 mA NMOS cell balancing drivers with diagnostics. Each driver features RDS(on) ≤ 0.5 Ω at 105 °C and supports both individual and common-source (CB_n:n−1_C) configurations for efficient resistor sharing - eliminating the need for external balancing FETs in most designs.
What safety certifications apply to the MC33771BTA2AE?
The MC33771BTA2AE is designed to support ISO 26262 ASIL D safety goals and is qualified per AEC-Q100 Grade 1 (−40 °C to +105 °C). It incorporates dual-core lockstep monitoring, memory ECC, voltage/temperature watchdogs, and fault-tolerant GPIO - enabling end-system certification without requiring additional safety microcontrollers.
What is the operating voltage range for the MC33771BTA2AE?
The MC33771BTA2AE operates across 9.6 V to 63 V on VPWR pins, with transient tolerance up to 75 V. Its normal functional range begins at 9.6 V; operation below 7.6 V enters reset mode, and voltages below −0.3 V or above 75 V risk permanent damage. This range supports 48 V automotive systems and medium-voltage industrial battery stacks.
MC33771BTA2AE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 64-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Battery Cell Controller
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 7 ~ 14
- Fault Protection:
- Over/Under Voltage
- Interface:
- SPI
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
MC33771BTA2AE FAQ
1.How can I place an order for MC33771BTA2AE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33771BTA2AE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC33771BTA2AE reliable?
The price and inventory of MC33771BTA2AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33771BTA2AE is usually 5 days.
3.What payment methods are accepted for MC33771BTA2AE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33771BTA2AE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33771BTA2AE?
MC33771BTA2AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33771BTA2AE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC33771BTA2AE?
For technical support, including MC33771BTA2AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33771BTA2AE requirements.
6.How does Aetrix verify that MC33771BTA2AE is sourced from the original manufacturer or authorized distributors?
All MC33771BTA2AE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC33771BTA2AE meets industry standards.
7.What is the process for return or replacement of MC33771BTA2AE?
All MC33771BTA2AE units undergo pre-shipment inspection (PSI). If there is an issue with MC33771BTA2AE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC33771BTA2AE part is unused and in its original packaging.
Return procedure for MC33771BTA2AE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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