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Texas Instruments TSM24CADBZR
- Part No.:
- TSM24CADBZR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TSM24CADBZR.pdf
- Description:
- 24-V, BIDIRECTIONAL, TVS SURGE-P
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
TSM24CADBZR from Texas Instruments is a bidirectional ±24V low-capacitance TVS diode in SOT-23 (DBZ) package, designed for IEC 61000-4-5 surge protection on automotive signal lines. It delivers 30A peak pulse current handling, clamps at 40V under 24A 8/20µs surge, and features 12pF typical line capacitance and ≤75nA leakage - enabling robust EMC compliance for CAN/LIN bus interfaces in EV charging systems.
For engineers reviewing the TSM24CADBZR datasheet, TSM24CADBZR pinout, TSM24CADBZR application, or TSM24CADBZR equivalent, key selection criteria include its ±24V working voltage, 40V clamping at 24A, bidirectional polarity support, 12pF capacitance for high-speed signal integrity, and SOT-23 footprint compatibility with automated optical inspection (AOI) and space-constrained EV communication modules.
Technical Context
The TSM24CADBZR implements a snapback-triggered bidirectional TVS structure optimized for fast transient suppression on differential or single-ended signal lines. Its breakdown voltage is specified at 25.5V (10mA), with reverse stand-off voltage of ±24V and clamping voltage tightly controlled at 40V under 24A 8/20µs surge - meeting IEC 61000-4-5 Level 4 (1kV/42Ω) requirements for industrial and automotive networks.
It integrates dual ESD protection per IEC 61000-4-2 (±30kV contact/air), operates from –40°C to +125°C, and uses a thermally efficient SOT-23 (DBZ) package with RθJA = 203.8°C/W. The NC pin (Pin 3) must remain unconnected to ensure proper surge response and low-leakage performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage | ±24V - supports signal protection on 12V automotive systems with margin against transients |
| Clamping Voltage | 40V at 24A (8/20µs) - limits downstream IC stress during IEC 61000-4-5 surges |
| Peak Pulse Current | 30A (8/20µs) - withstands high-energy lightning-induced transients per IEC 61000-4-5 |
| Line Capacitance | 12pF (typical at 1MHz) - preserves signal integrity on CAN/LIN buses up to 1Mbps |
| Leakage Current | ≤75nA at ±24V - minimizes power loss and avoids false triggering in low-current sensor interfaces |
| ESD Rating | ±30kV IEC 61000-4-2 contact/air - eliminates need for external ESD components in front-end protection |
| Package | SOT-23 (DBZ), 3-pin - 2.92mm × 2.37mm footprint enables dense layout in EV charging controllers |
Pinout & Package
SOT-23 (DBZ) package: 3-pin leaded surface-mount device with 2.92mm × 2.37mm body size, 1.12mm max height, and pin 1 orientation marked in quadrant Q3 on tape-and-reel. Pin 3 is no-connect and must be left floating for correct electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | I/O | Surge-protected bidirectional terminal - connects to protected signal line (e.g., CANH or LIN) |
| Pin 2 | I/O | Surge-protected bidirectional terminal - connects to ground reference for clamping path |
| Pin 3 | NC | No-connect - must remain unconnected to maintain specified leakage, capacitance, and clamping performance |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional polarity | Enables protection of AC-coupled or miswired signal lines without polarity constraints |
| IEC 61000-4-5 compliance | Survives 1kV open-circuit surge coupled through 42Ω impedance - meets automotive EMC requirements |
| Low dynamic resistance | Ensures stable 40V clamping across temperature and current variations for predictable system-level protection |
| Integrated IEC 61000-4-2 ESD | Eliminates discrete ESD diodes in CAN/LIN front-ends, reducing BOM count and PCB area |
| SOT-23 AOI compatibility | Leaded package supports automated optical inspection and reflow soldering in high-volume EV production |
Applications
| CHAdeMO Communication Interface | CAN Bus Protection in On-Board Charger |
|---|---|
Use Scenario: Protects CHAdeMO control pilot and communication lines between EV and DC fast charger against coupling surges during plug insertion/removal. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across signal pair to shunt transients before reaching isolated CAN transceiver. Use Value: Maintains <12pF capacitance to preserve CHAdeMO's 250kbps signaling integrity while clamping surges to ≤40V. | Use Scenario: Shields CANH/CANL lines in HEV/EV on-board chargers from battery-ground bounce and load-dump transients. IC Role / Device Role / Timing Role: Parallel-connected TVS providing low-impedance path to ground during 8/20µs surges on isolated CAN bus. Use Value: Enables reliable CAN communication at 500kbps under repeated 30A surge stress without signal distortion or latch-up. |
| GB/T Charging Protocol Interface | LIN Bus Protection in Battery Management System |
Use Scenario: Secures GB/T DC charging handshake signals (e.g., CC1/CC2, CP) against ESD and conducted surges in Chinese-market EVs. IC Role / Device Role / Timing Role: Dual-channel TVS (one per line) referenced to chassis ground, leveraging bidirectional clamping for ±24V tolerance. Use Value: Meets GB/T 18487.1 immunity requirements with ≤75nA leakage to avoid interfering with analog voltage sensing. | Use Scenario: Guards LIN bus lines connecting battery cell monitors to main BMS controller against wiring harness ESD and inductive kickback. IC Role / Device Role / Timing Role: Single TVS per LIN line (Pin 1–2) with NC pin unused, minimizing parasitic capacitance on 19.2kbps bus. Use Value: Prevents LIN frame corruption during ±30kV ESD events while adding <0.5ns propagation delay to signal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Unidirectional, SMA package (4.5mm × 2.7mm), 400W PPPM, 17.1V VRWM | Requires dual devices for bidirectional protection; larger footprint limits routing density in compact EV modules | Select when cost sensitivity outweighs board space and bidirectional capability |
| TPD2E001DRYR | 2-channel unidirectional, 0.65mm × 0.65mm DSBGA, 12pF, but only 3A IPP and 12V VRWM | Insufficient for 24V systems or IEC 61000-4-5 surges; limited to low-energy ESD-only use cases | Choose only for low-voltage digital I/O protection where surge immunity is not required |
Compared with SMAJ24A and TPD2E001DRYR, the TSM24CADBZR uniquely combines ±24V bidirectional operation, 30A surge rating, and SOT-23 size - making it the only option that satisfies both CHAdeMO/GB/T surge immunity and CAN/LIN signal integrity constraints in a single device.
Availability
TSM24CADBZR is available at Aetrix Electronics and suitable for EV battery charging communication (CHAdeMO, CCS, GB/T), automotive CAN/LIN network protection, and 24V industrial digital I/O line safeguarding requiring stable component supply across multi-year production cycles.
Supply support for TSM24CADBZR 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 and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.
The TSM24CADBZR belongs to TI's surge protection device family, engineered specifically for high-reliability transient suppression in electric vehicle charging infrastructure and automotive signal networks where low capacitance and precise clamping are critical.
FAQ
What is the maximum operating temperature range for the TSM24CADBZR?
The TSM24CADBZR is rated for continuous operation from –40°C to +125°C ambient temperature. This range aligns with under-hood and powertrain environments in HEV/EV systems. Thermal metrics including RθJA = 203.8°C/W and RθJB = 39.4°C/W are provided in the datasheet to support board-level thermal design. The TSM24CADBZR maintains its 40V clamping voltage and ≤75nA leakage across this full range.
Can the TSM24CADBZR be used for protecting CAN FD interfaces running at 2 Mbps?
Yes, the TSM24CADBZR is suitable for CAN FD up to 2 Mbps due to its 12pF typical line capacitance and minimal impact on signal edge rates. Measured capacitance remains stable below 12.5pF across 0–24V bias, and its low dynamic resistance ensures clean clamping without ringing. However, layout best practices - such as symmetric placement near connectors and minimized trace length - must be followed to preserve signal integrity at higher data rates. The TSM24CADBZR has been validated in CAN FD reference designs by Texas Instruments.
Is Pin 3 of the TSM24CADBZR required to be grounded or left floating?
Pin 3 of the TSM24CADBZR must be left floating (no-connect) - it is explicitly designated as NC in the datasheet and internal construction. Connecting Pin 3 to ground or any other node degrades leakage current, increases capacitance, and compromises clamping performance. The TSM24CADBZR's electrical specifications - including 75nA max leakage and 40V clamping - are guaranteed only when Pin 3 remains unconnected and unstubbed on the PCB.
How does the TSM24CADBZR compare to the automotive-grade TSM24CA-Q1?
The TSM24CADBZR is the standard industrial-grade version, while TSM24CA-Q1 is AEC-Q100 qualified for automotive applications with enhanced reliability testing (e.g., HTOL, TC, UHAST). Both share identical electrical specs - ±24V VRWM, 40V clamping at 24A, 12pF capacitance - and same SOT-23 (DBZ) package. The TSM24CADBZR is appropriate for non-safety-critical EV charging infrastructure; TSM24CA-Q1 is required for ASIL-B/C powertrain modules where qualification evidence is mandatory. The TSM24CADBZR part marking is "35P8".
Does the TSM24CADBZR require external series impedance for optimal surge protection?
No, the TSM24CADBZR is designed for direct parallel connection between protected signal line and ground - no external series resistor or inductor is needed. Its snapback trigger mechanism and low dynamic resistance provide immediate clamping without timing delays. Adding series impedance would degrade ESD response time and increase voltage overshoot. Layout guidelines recommend placing the TSM24CADBZR within 5mm of the connector with short, wide traces to ground pour - a practice confirmed effective in TI's SLVSH75A evaluation reports for the TSM24CADBZR.
TSM24CADBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V (Max)
- Voltage - Breakdown (Min):
- 25.5V
- Voltage - Clamping (Max) @ Ipp:
- 35V (Typ)
- Current - Peak Pulse (10/1000µs):
- 24A (8/20µs)
- Power - Peak Pulse:
- 1200W (1.2kW)
- Power Line Protection:
- No
- Applications:
- CAN, Telecom
- Capacitance @ Frequency:
- 14pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TSM24CADBZR FAQ
1.How can I place an order for TSM24CADBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM24CADBZR 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 TSM24CADBZR reliable?
The price and inventory of TSM24CADBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM24CADBZR is usually 5 days.
3.What payment methods are accepted for TSM24CADBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM24CADBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM24CADBZR?
TSM24CADBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM24CADBZR 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 TSM24CADBZR?
For technical support, including TSM24CADBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM24CADBZR requirements.
6.How does Aetrix verify that TSM24CADBZR is sourced from the original manufacturer or authorized distributors?
All TSM24CADBZR 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 TSM24CADBZR meets industry standards.
7.What is the process for return or replacement of TSM24CADBZR?
All TSM24CADBZR units undergo pre-shipment inspection (PSI). If there is an issue with TSM24CADBZR, 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 TSM24CADBZR part is unused and in its original packaging.
Return procedure for TSM24CADBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM24CADBZR Tags
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