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Texas Instruments TPIC71008TDCARQ1
- Part No.:
- TPIC71008TDCARQ1
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 48-PowerTFSOP (0.240", 6.10mm Width)
- Datasheet:
-
TPIC71008TDCARQ1.pdf
- Description:
- IC INTFACE SPECIALIZED 48HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,156
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Product details
Overview
TPIC71008TDCARQ1 from Texas Instruments is an automotive-grade eight-channel squib driver IC for airbag deployment systems, integrating independent high-side and low-side drivers per channel, 40V pin tolerance (except supply/ground pins), -40°C to 105°C operating range, and SPI slave interface with parity check. It delivers 1.2A or 1.75A firing current at 2ms or 0.5ms dwell time respectively, with programmable firing timeout up to 8.2 ms.
For engineers reviewing the TPIC71008TDCARQ1 datasheet, TPIC71008TDCARQ1 pinout, TPIC71008TDCARQ1 application, or TPIC71008TDCARQ1 equivalent, key selection considerations include dual-safing logic (TZ/IWD), loop diagnostics capability, ratio-metric squib resistance measurement via AMX_OUT and external ADC reference, and thermal/avalanche protection on all eight channels.
Technical Context
The TPIC71008TDCARQ1 implements dual independent switch control per channel: high-side drivers operate in current-regulation mode during deployment, while low-side drivers operate in RDS(on) mode with higher fixed current limit. Firing voltage range is 10V–35V (transients to 40V) between VZx and Zx pins, with programmable per-channel firing timer and common load current settings via SPI-mapped registers.
Diagnostic functions include high-side/low-side switch testing, squib leakage detection (to battery/ground/between channels), and analog voltage monitoring via multiplexed AMX_OUT buffer referenced to SQREF1/SQREF2. Internal fault monitoring covers over-temperature, short-to-ground, and improper arming sequence, with status reported through SPI registers and AMX_OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Firing Current Options | 1.2 A min (2 ms dwell) or 1.75 A min (0.5 ms dwell); selectable via EEPROM and SPI register |
| Firing Voltage Range | 10 V to 35 V between VZx and Zx pins; supports transients up to 40 V without clamping devices |
| Programmable Firing Time | Up to 8.2 ms per channel; prevents thermal runaway via hardware-enforced timeout |
| SPI Interface | Slave-only with parity check; enables configuration, status readback, and diagnostic command sequencing |
| Operating Temperature | -40°C to +105°C ambient; qualified for automotive passenger compartment and module mounting locations |
| Pin Voltage Rating | 40 V absolute max on all I/O pins except GNDx, AGND, DGND, VCC5, VDDIO, AMX_OUT |
| Safing Logic Inputs | TZ (deploy enable) and IWD (inhibit watchdog) - both required active for deployment sequence initiation |
Pinout & Package
TPIC71008TDCARQ1 uses a thermally enhanced 48-pin HTSSOP (DCA) package with PowerPad, 0.5 mm pitch, 12.5 mm × 6.1 mm footprint, and MSL Level-3 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VZ0–VZ3 | High-side driver output voltage reference | Connects to squib anode; supports 10–35 V firing voltage; 40 V transient tolerant |
| Z0–Z3, ZM0–ZM3 | Squib load connection terminals | Zx: high-side output; ZMx: low-side return; each pair forms one deployment loop |
| SOMI/SOMO/SCLK/CS_N | SPI serial interface | Full-duplex slave interface with parity; CS_N active-low enables register access |
| AMX_OUT | Analog multiplexed output | Provides ratio-metric squib resistance measurements using external microcontroller ADC |
| TZ, IWD, RESET_N | Hardware safing and reset control | TZ=high and IWD=low required to enter deployment mode; RESET_N resets internal state |
| AGND, DGND1, DGND2, GND0–GND3 | Analog/digital/loop ground references | Separate ground domains isolate noise-sensitive analog paths from high-current switching loops |
Key Features
| Feature | Design Value |
|---|---|
| Independent high/low-side control per channel | Enables flexible deployment sequencing: HS deactivates first, LS follows after ~100 µs (hardware) or SPI command (software) |
| Loop diagnostics without squib load | Detects squib leakage to battery/ground/between channels even with open-circuit or missing squib |
| No external clamping required | Internal protection eliminates need for TVS diodes on squib pins, reducing BOM count and PCB area |
| Ratiometric squib resistance measurement | Uses SQREF1/SQREF2 and AMX_OUT to cancel supply variation effects, improving measurement accuracy |
| Thermal and avalanche protection | Shuts down individual channel if over-temperature or short-to-ground occurs during firing, preserving system integrity |
Applications
| Frontal Airbag Module | Side-Impact Curtain Airbag |
|---|---|
|
Use Scenario: Deployment of dual-stage frontal airbag using two independent squib circuits per module. IC Role / Device Role / Timing Role: Eight-channel squib driver providing synchronized or staggered firing control with independent current/timing per channel. Use Value: Enables precise energy delivery matching crash severity via programmable 1.2A/1.75A current and 0.5–8.2 ms dwell time per channel. |
Use Scenario: Activation of long linear curtain airbag with distributed squib points along A/B-pillars and roof rail. IC Role / Device Role / Timing Role: High-reliability squib driver managing up to eight discrete squib loads across extended mechanical layout. Use Value: Reduces wiring harness complexity by integrating all eight drivers in single HTSSOP package with 40 V pin tolerance for robustness against load dump. |
| Driver Knee Airbag | Seatbelt Pretensioner |
|
Use Scenario: Compact knee airbag module requiring minimal PCB area and thermal management headroom. IC Role / Device Role / Timing Role: Thermally protected squib driver delivering 1.75 A firing current in <0.5 ms for rapid inflation in confined space. Use Value: PowerPad-enhanced HTSSOP package enables efficient heat dissipation without external heatsink, supporting high-density module design. |
Use Scenario: Dual pretensioner actuation (lap/shoulder) with coordinated timing and independent fault reporting. IC Role / Device Role / Timing Role: Dual-channel deployment controller using two of eight available squib drivers with shared diagnostics and safing logic. Use Value: Single-device integration reduces inter-module communication latency and eliminates redundant safety logic across multiple ASICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar squib driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPIC71007TDCARQ1 | Seven-channel variant; identical architecture, pinout, and register map except one fewer squib channel | Used where system requires ≤7 squib loads; shares same diagnostic features and firing profiles | Select when BOM simplification or cost reduction is prioritized over eighth channel redundancy |
| MC33816AEKR2 | NXP device with six-channel squib drivers, integrated LIN transceiver, and different SPI register structure | Targets LIN-based airbag ECUs; lacks AMX_OUT analog mux and ratiometric measurement capability | Choose when LIN bus integration is required and analog squib diagnostics are handled externally |
Compared with TPIC71008TDCARQ1, TPIC71007TDCARQ1 offers identical functionality with one less channel and reduced pin count, while MC33816AEKR2 trades squib channel count and analog diagnostics for embedded LIN communication-making it suitable only where bus-level integration outweighs precision squib characterization needs.
Availability
TPIC71008TDCARQ1 is available at Aetrix Electronics and suitable for automotive airbag control units, occupant restraint system modules, and advanced driver assistance system (ADAS) safety controllers requiring stable component supply, AEC-Q100 Grade 1 qualification, and long-term production continuity.
Supply support for TPIC71008TDCARQ1 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and automotive ICs, with leadership in functional safety and high-reliability power management solutions.
The TPIC71008TDCARQ1 belongs to TI's automotive safety portfolio, designed specifically for ASIL-B compliant airbag deployment systems requiring dual-safing logic, real-time diagnostics, and robust transient immunity in harsh vehicle environments.
FAQ
What is the maximum firing voltage supported by the TPIC71008TDCARQ1?
The TPIC71008TDCARQ1 supports a firing voltage range of 10 V to 35 V between each VZx and corresponding Zx pin, with transient tolerance up to 40 V. This eliminates the need for external clamping devices on squib pins, as confirmed in the SLVSAX3 datasheet Section 1 Features and Description. The device maintains safe operation under load-dump conditions common in automotive 12 V systems.
Does the TPIC71008TDCARQ1 require external TVS diodes on squib pins?
No, the TPIC71008TDCARQ1 does not require external clamping devices on squib pins. Its 40 V pin capability (on VZx/Zx/ZMx pins) and internal protection architecture prevent substrate injection effects during dynamic shorts to ground, as explicitly stated in the Features section of the SLVSAX3 datasheet. This reduces BOM cost and PCB area versus legacy solutions.
How is squib resistance measured using the TPIC71008TDCARQ1?
The TPIC71008TDCARQ1 enables ratiometric squib resistance measurement via its AMX_OUT analog multiplexed output, referenced to external SQREF1 and SQREF2 pins connected to the microcontroller's ADC supply. This cancels supply variation effects, delivering accurate resistance readings without requiring precision external references, as detailed in the Description section and Figure 1 of SLVSAX3.
What safing inputs must be asserted to enable deployment on the TPIC71008TDCARQ1?
To enable deployment, the TPIC71008TDCARQ1 requires both TZ = high and IWD = low simultaneously, in addition to correct SPI configuration and register programming. These two independent hardware safing inputs form part of a multi-layer arming sequence that prevents inadvertent deployment, as specified in the Description section and Functional Block Diagram of SLVSAX3.
Is the TPIC71008TDCARQ1 pin-compatible with other TI squib drivers?
The TPIC71008TDCARQ1 is pin-compatible with the TPIC71007TDCARQ1 (seven-channel variant) - sharing identical 48-pin HTSSOP (DCA) package, pinout, and register map except for one fewer squib channel. However, no documentation confirms pin-compatibility with non-TPIC710xx family devices such as TPIC6B595 or unrelated TI drivers.
TPIC71008TDCARQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-PowerTFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Airbag
- Interface:
- SPI Serial
- Voltage - Supply:
- -
- Supplier Device Package:
- 48-HTSSOP
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
TPIC71008TDCARQ1 FAQ
1.How can I place an order for TPIC71008TDCARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPIC71008TDCARQ1 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 TPIC71008TDCARQ1 reliable?
The price and inventory of TPIC71008TDCARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPIC71008TDCARQ1 is usually 5 days.
3.What payment methods are accepted for TPIC71008TDCARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPIC71008TDCARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPIC71008TDCARQ1?
TPIC71008TDCARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPIC71008TDCARQ1 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 TPIC71008TDCARQ1?
For technical support, including TPIC71008TDCARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPIC71008TDCARQ1 requirements.
6.How does Aetrix verify that TPIC71008TDCARQ1 is sourced from the original manufacturer or authorized distributors?
All TPIC71008TDCARQ1 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 TPIC71008TDCARQ1 meets industry standards.
7.What is the process for return or replacement of TPIC71008TDCARQ1?
All TPIC71008TDCARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPIC71008TDCARQ1, 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 TPIC71008TDCARQ1 part is unused and in its original packaging.
Return procedure for TPIC71008TDCARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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