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Texas Instruments TSM24BDBZR
- Part No.:
- TSM24BDBZR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TSM24BDBZR.pdf
- Description:
- 24-V, 30-KV, UNIDIRECTIONAL SURG
- Quantity:
- Payment:
- Shipping:
Inventory:2,969
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Product details
Overview
TSM24BDBZR from Texas Instruments is a unidirectional transient voltage suppression (TVS) diode in SOT-23 (DBZ) package, designed for IEC 61000-4-5 surge and IEC 61000-4-2 ESD protection on 24 V-rated signal/power lines. It delivers 20 A peak pulse current handling, 33 V typical clamping voltage at 20 A, 24 pF typical line capacitance, and 75 nA max leakage at 24 V - enabling robust protection of CAN transceivers, PLC I/O, and industrial sensors without signal integrity degradation.
For engineers reviewing the TSM24BDBZR datasheet, TSM24BDBZR pinout, TSM24BDBZR application, or TSM24BDBZR equivalent, key selection criteria include its unidirectional polarity, 24 V working voltage, low 33 V clamping under 20 A surge, ±30-kV IEC ESD rating, and SOT-23 footprint compatibility with automated optical inspection and space-constrained PCB layouts.
Technical Context
The TSM24BDBZR operates as a silicon avalanche diode configured in unidirectional topology, with cathode connected to IO and anodes tied to GND (pins 1 & 2). Its breakdown voltage is specified at 26.5 V (min) with 10 mA test current, and it enters low-impedance clamping mode during transients exceeding VRWM = 24 V.
Thermal performance is defined by RθJA = 220.6 °C/W and RθJB = 54.1 °C/W in SOT-23, supporting operation from –40 °C to +125 °C ambient. The device achieves ±30-kV contact/air-gap ESD immunity per IEC 61000-4-2 while maintaining only 24 pF capacitance at 0 V bias - critical for high-speed CAN and digital I/O lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Surge Rating | 20 A peak pulse current (8/20 µs), enabling protection against lightning-induced surges per IEC 61000-4-5 Level 3/4. |
| Clamping Voltage | 33 V typical at 20 A IPP - limits stress on downstream 24 V-rated ICs like CAN transceivers or microcontrollers. |
| Working Voltage | 24 V reverse stand-off (VRWM) - matches nominal 24 V power rails and digital I/O systems without false triggering. |
| ESD Protection | ±30 kV contact & air-gap per IEC 61000-4-2 - exceeds standard requirements for industrial and medical equipment. |
| Leakage Current | 75 nA max at 24 V - ensures negligible loading on high-impedance sensor inputs or battery-backed circuits. |
| Line Capacitance | 24 pF typical at 0 V - preserves signal integrity on CAN FD (up to 5 Mbps) and other >1 Mbps digital interfaces. |
| Package | SOT-23 (DBZ), 3-pin, 2.92 mm × 2.37 mm - enables high-density placement and AOI-compatible assembly. |
Pinout & Package
SOT-23 (DBZ) package: 3-pin, leaded, 2.92 mm × 2.37 mm footprint, 1.12 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | GND | Anode connection; must be shorted to Pin 2 on PCB for optimal thermal and ESD path performance. |
| Pin 2 | GND | Second anode terminal; parallel grounding with Pin 1 reduces inductance and improves clamping response. |
| Pin 3 | I/O | Cathode input/output node; connects to protected line (e.g., CANH, TXD, 24 V rail) - surge current shunted to GND via avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional Clamping | Optimized for single-ended lines (e.g., CANH, 24 V supply) - avoids forward conduction during normal operation while delivering fast, low-VCLAMP response to positive transients. |
| Low Capacitance | 24 pF typical IO-to-GND capacitance minimizes signal distortion and timing skew on high-speed data lines up to 5 Mbps. |
| Integrated Dual-Standard ESD | Meets both ±30-kV IEC 61000-4-2 and ±2.5-kV HBM - eliminates need for external ESD components in cost-sensitive industrial designs. |
| Small-Leaded Package | SOT-23 (DBZ) reduces board area by ~50% vs SMA - supports miniaturized PLC modules and compact motor driver PCBs. |
| Low Leakage | 75 nA max at 24 V enables use on battery-powered sensor nodes and high-impedance analog front-ends without measurable drain. |
Applications
| Industrial Sensor Interface | CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting 4–20 mA or 0–10 V analog outputs and digital status lines in factory-floor pressure/temperature sensors exposed to EFT and surge events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor output and controller input, clamping transients before they reach ADC or isolation barrier. Use Value: Maintains signal fidelity with 24 pF capacitance and prevents latch-up in downstream instrumentation amplifiers during 20 A surge events. |
Use Scenario: Safeguarding CANH/CANL lines in automotive-grade industrial gateways and motor control units operating in electrically noisy environments. IC Role / Device Role / Timing Role: Paired TSM24BDBZR devices (one per line) provide bidirectional protection when used with complementary polarity on CANL - though each device is unidirectional, system-level protection is achieved via dual placement. Use Value: Enables reliable CAN communication at 1 Mbps+ by limiting clamping voltage to 33 V while adding <0.5 ns propagation delay. |
| PLC Digital I/O Module | 24 V Power Rail Protection |
|
Use Scenario: Shielding discrete input channels (e.g., limit switches, proximity sensors) connected to 24 V DC PLC backplanes from induced surges in factory wiring harnesses. IC Role / Device Role / Timing Role: Per-channel TVS placed at connector entry point, referenced to common ground plane with low-inductance GND tie between Pins 1 and 2. Use Value: Prevents false triggering and component damage during 8/20 µs transients up to 20 A - validated per IEC 61000-4-5 Ed. 4. |
Use Scenario: Decoupling and surge suppression on 24 V supply rails feeding isolated DC/DC converters and microcontroller subsystems in medical imaging or HVAC controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS across rail-to-ground, activated only during overvoltage events - no effect on steady-state regulation or efficiency. Use Value: Limits rail overshoot to ≤33 V during lightning strikes, protecting 24 V-rated LDOs and PMICs without derating their input voltage range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Bidirectional, DO-214AC (SMA) package, 38.9 V clamping at 20 A, 100 pF capacitance. | Higher clamping voltage and capacitance reduce suitability for high-speed CAN or precision analog lines. | Select when board space allows larger SMA footprint and bidirectional protection is required on AC-coupled signals. |
| TPD2E001DRYR | 2-channel unidirectional array in X2SON-6, 15 pF per channel, 12 V VRWM, 2.5 A surge rating. | Lower surge rating and working voltage restrict use to low-energy data lines (e.g., USB, I²C), not 24 V power or CAN. | Prefer for multi-line protection in compact consumer electronics where 20 A surge immunity is not required. |
Compared with SMAJ24A and TPD2E001DRYR, the TSM24BDBZR uniquely balances 20 A surge capability, 24 V working voltage, 33 V clamping, and 24 pF capacitance in a miniature SOT-23 - making it the optimal choice for space-constrained industrial CAN and 24 V I/O protection where signal integrity and robustness are co-prioritized.
Availability
TSM24BDBZR is available at Aetrix Electronics and suitable for industrial sensor interfaces, CAN bus nodes, and PLC digital I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.
Supply support for TSM24BDBZR 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 high-reliability components for industrial, automotive, and communications markets.
The TSM24BDBZR belongs to TI's surge protection device family, engineered specifically for robust IEC 61000-4-5/4-2 compliance on 12–24 V industrial signal and power lines - prioritizing low clamping, minimal capacitance, and small-footprint manufacturability.
FAQ
What is the maximum surge current rating for TSM24BDBZR?
The TSM24BDBZR is rated for 20 A peak pulse current (IPP) under IEC 61000-4-5 8/20 µs waveform conditions at 25 °C. This rating reflects its ability to safely shunt high-energy transients such as lightning-induced surges without failure, provided PCB layout maintains low-inductance grounding between Pins 1 and 2.
Does TSM24BDBZR support bidirectional signal lines like CANH/CANL?
The TSM24BDBZR is unidirectional and protects only positive-going transients from I/O to GND. For full bidirectional CAN bus protection, two TSM24BDBZR devices are used - one on CANH (cathode to line) and one on CANL (anode to line), or a dedicated bidirectional variant like TSM24BDP is selected. Each TSM24BDBZR must be correctly oriented per its pinout.
What is the clamping voltage of TSM24BDBZR at 20 A surge current?
The TSM24BDBZR exhibits a typical clamping voltage (VCLAMP) of 33 V at 20 A peak pulse current (8/20 µs). This value is measured I/O-to-GND and ensures downstream 24 V-rated ICs remain within safe operating limits during surge events - a key parameter verified in TI's production testing per SLVSHG9A.
Can TSM24BDBZR be used on 12 V systems despite its 24 V working voltage?
Yes - the TSM24BDBZR's 24 V VRWM makes it suitable for 12 V systems where higher margin against false triggering is needed, such as in automotive body control modules or industrial controllers with wide input ranges. Its low 75 nA leakage and 24 pF capacitance ensure no adverse impact on 12 V signal integrity or power efficiency.
What is the recommended PCB layout practice for TSM24BDBZR grounding?
TI specifies that Pins 1 and 2 (both GND) must be connected together on the PCB as close to the TSM24BDBZR package as possible - using a low-inductance copper pour or short trace - to minimize ground loop impedance and ensure effective clamping. This layout is critical to achieving the rated 20 A surge performance and ±30 kV ESD immunity.
TSM24BDBZR 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:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V (Max)
- Voltage - Breakdown (Min):
- 24.8V
- Voltage - Clamping (Max) @ Ipp:
- 44V
- Current - Peak Pulse (10/1000µs):
- 20A (8/20µs)
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- CAN
- Capacitance @ Frequency:
- 24pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TSM24BDBZR FAQ
1.How can I place an order for TSM24BDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM24BDBZR 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 TSM24BDBZR reliable?
The price and inventory of TSM24BDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM24BDBZR is usually 5 days.
3.What payment methods are accepted for TSM24BDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM24BDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM24BDBZR?
TSM24BDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM24BDBZR 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 TSM24BDBZR?
For technical support, including TSM24BDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM24BDBZR requirements.
6.How does Aetrix verify that TSM24BDBZR is sourced from the original manufacturer or authorized distributors?
All TSM24BDBZR 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 TSM24BDBZR meets industry standards.
7.What is the process for return or replacement of TSM24BDBZR?
All TSM24BDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TSM24BDBZR, 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 TSM24BDBZR part is unused and in its original packaging.
Return procedure for TSM24BDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM24BDBZR Tags
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