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Texas Instruments TSM24ADBZR
- Part No.:
- TSM24ADBZR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TSM24ADBZR.pdf
- Description:
- 24-V, UNIDIRECTIONAL, 60A, TVS S
- Quantity:
- Payment:
- Shipping:
Inventory:5,692
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Product details
Overview
TSM24ADBZR from Texas Instruments is a unidirectional transient voltage suppression (TVS) diode in SOT-23 (DBZ) package, designed for robust surge and ESD protection on 24-V industrial signal/power lines. It delivers 60-A IEC 61000-4-5 surge clamping at 38 V (typ), features 24-V working voltage, 75-nA max leakage, and 54-pF typical line capacitance - enabling protection of USB Type-C™ VBUS, PLC I/O, and 24-V motor driver interfaces without signal integrity degradation.
For engineers reviewing the TSM24ADBZR datasheet, TSM24ADBZR pinout, TSM24ADBZR application, or TSM24ADBZR equivalent, key selection criteria include its unidirectional clamping behavior, low 38-V clamping voltage at 60 A, SOT-23 footprint compatibility with AOI, ±30-kV IEC 61000-4-2 ESD rating, and suitability for 12-V/24-V system-level EMC compliance per IEC 61000-4-5.
Technical Context
The TSM24ADBZR operates as a unidirectional avalanche diode, triggered above 26-V breakdown (min) to shunt transients from I/O to GND while maintaining <75 nA leakage at 24 V. Its clamping response is optimized for 8/20-µs surge waveforms, delivering 38-V clamping at 60-A peak pulse current and 7-V forward clamping during reverse polarity events.
Thermally, it sustains operation from –40°C to 125°C with RθJA = 203.8°C/W in SOT-23, and integrates dual ESD protection: ±2.5-kV HBM and ±30-kV IEC 61000-4-2 contact/air discharge - all within a 2.92 mm × 2.37 mm leaded package requiring dual-GND connection for rated performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | 24 V - defines maximum continuous DC operating voltage before leakage exceeds 100 nA; matches 12-V system rail protection with margin. |
| Clamping Voltage (VCLAMP) | 38 V (typ) at 60 A, 8/20 µs - limits downstream IC exposure during lightning-surge events to safe levels below logic supply rails. |
| Leakage Current (ILEAK) | 75 nA (max) at 24 V - ensures negligible power loss and no loading on high-impedance sensor or analog input lines. |
| Line Capacitance (CLINE) | 54 pF (typ) at 0 V, 1 MHz - preserves signal integrity on USB Type-C™ VBUS and digital I/O up to ~100 Mbps. |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact / ±30 kV air - exceeds industrial immunity requirements without external ESD staging components. |
| Surge Rating (IEC 61000-4-5) | 60 A, 8/20 µs - withstands 2.5-kV open-circuit surge coupled through 42 Ω impedance per standard test setup. |
| Breakdown Voltage (VBR) | 26 V (min) at 10 mA - ensures reliable turn-on before protected circuitry reaches damage thresholds. |
Pinout & Package
SOT-23 (DBZ) package: 2.92 mm × 2.37 mm × 1.12 mm (max height), leaded, RoHS-compliant, moisture sensitivity level 1, tape-and-reel (3000 pcs/reel), marking "35J8".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | GND | Ground terminal - must be connected to PCB ground plane with low-inductance trace; shares internal bond wire with Pin 2. |
| Pin 2 | GND | Ground terminal - electrically tied to Pin 1 internally; both pins require parallel PCB connection to minimize loop inductance during surge events. |
| Pin 3 | I/O | Protected line terminal - connects to signal or power rail (e.g., VBUS, digital input); clamps transients to GND when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise overvoltage protection on single-ended lines (e.g., VBUS, 24-V outputs) without forward conduction during normal operation. |
| Low 38-V clamping at 60-A surge | Keeps protected ICs (e.g., RS-485 transceivers, MCU GPIOs) below absolute maximum ratings during IEC 61000-4-5 stress tests. |
| Dual-GND pin configuration | Reduces common-mode surge impedance by splitting return path; requires PCB layout with both Pins 1 & 2 tied to ground near device body. |
| 54-pF line capacitance | Minimizes signal rise-time degradation on high-speed lines like USB Type-C™ VBUS, supporting full-speed USB 2.0 data integrity. |
| ±30-kV IEC 61000-4-2 ESD rating | Eliminates need for upstream ESD filters in industrial human-interface applications such as PLC front-panel buttons or sensor connectors. |
Applications
| Industrial Sensor Interfaces | USB Type-C™ VBUS Protection |
|---|---|
|
Use Scenario: Protecting 4–20-mA current-loop sensors and digital temperature/humidity sensors in factory automation cabinets exposed to cable-borne surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor output line and system ground to clamp induced transients before reaching ADC or isolation barrier. Use Value: Maintains sensor accuracy by limiting clamping voltage to 38 V while adding only 54 pF loading - avoiding RC filtering effects on slow analog signals. |
Use Scenario: Safeguarding USB Type-C™ receptacles on industrial HMIs and docking stations against hot-plug ESD and nearby lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge suppressor on VBUS line, positioned upstream of load switch and buck converter to prevent overvoltage damage during fault conditions. Use Value: Withstands ±30-kV contact ESD and 60-A 8/20-µs surges while preserving USB 2.0 signal integrity via low 54-pF capacitance and minimal leakage. |
| PLC Digital I/O Modules | 24-V Motor Driver Control Lines |
|
Use Scenario: Shielding dry-contact inputs and transistor-switched outputs in programmable logic controllers installed in electrically noisy manufacturing environments. IC Role / Device Role / Timing Role: Parallel-connected TVS on each I/O channel to divert fast transients from relay coils, solenoids, or field wiring into ground plane. Use Value: 24-V working voltage aligns with standard PLC supply rails; dual-GND pins reduce ground bounce during multi-channel simultaneous clamping events. |
Use Scenario: Protecting enable, direction, and PWM control lines feeding H-bridge drivers in servo and stepper motor systems subject to back-EMF coupling. IC Role / Device Role / Timing Role: Point-of-load TVS on microcontroller GPIOs driving optocouplers or gate drivers to suppress inductive kickback spikes. Use Value: Low 75-nA leakage prevents false triggering of high-impedance CMOS inputs; 38-V clamping ensures MCU-safe voltage during 24-V rail disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | DO-214AC (SMA) package; 5.3 mm × 4.5 mm footprint; 400-W peak pulse power; 38.9-V clamping at 43.5-A surge. | Larger board area required; higher thermal resistance (RθJA ≈ 50°C/W); less suitable for dense layouts or AOI inspection. | Select SMAJ24A only when higher surge energy handling (>2800 W) is needed and PCB space permits larger package. |
| TSM24CA | Bidirectional variant; symmetric ±24-V standoff; 38-V clamping in both directions; same SOT-23 (DBZ) package and pinout. | Required for AC-coupled or differential lines (e.g., RS-485, CAN) where polarity reversal occurs; not suitable for VBUS or single-rail DC protection. | Choose TSM24CA instead of TSM24ADBZR only when protecting bidirectional signals or floating references where reverse polarity surges are expected. |
Compared with SMAJ24A, TSM24ADBZR saves >50% board area and enables automated optical inspection, while matching clamping performance at lower surge current. Against TSM24CA, TSM24ADBZR provides superior forward-conduction margin for unidirectional power/signal rails but lacks reverse-direction protection.
Availability
TSM24ADBZR is available at Aetrix Electronics and suitable for industrial sensors, PLC I/O modules, and USB Type-C™ VBUS protection requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TSM24ADBZR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The TSM24ADBZR belongs to TI's industrial-grade TVS diode family, engineered specifically for EMC-hardened protection of 12-V/24-V signal and power rails in harsh electromagnetic environments - including factory floors, motor control cabinets, and outdoor equipment enclosures.
FAQ
What is the maximum clamping voltage of the TSM24ADBZR during an IEC 61000-4-5 surge event?
The TSM24ADBZR exhibits a typical clamping voltage of 38 V at 60 A for an 8/20-µs surge waveform, as specified in its electrical characteristics table. This value represents the peak voltage seen across the device during full-rated surge current, ensuring downstream components remain within safe operating limits. The TSM24ADBZR maintains this clamping performance consistently across its operating temperature range of –40°C to 125°C.
Can the TSM24ADBZR be used to protect bidirectional communication lines like RS-485?
No - the TSM24ADBZR is a unidirectional TVS diode optimized for single-ended lines such as VBUS or 24-V power rails. For bidirectional interfaces like RS-485 or CAN, TI recommends the TSM24CA, which offers symmetric clamping in both polarities while sharing the same SOT-23 (DBZ) package and pinout. Using TSM24ADBZR on bidirectional lines risks inadequate protection during negative-going transients.
How should the dual-GND pins (1 and 2) of the TSM24ADBZR be routed on the PCB?
Pins 1 and 2 of the TSM24ADBZR must be connected together to the system ground plane using short, wide, low-inductance traces - ideally joined directly beneath the device body. This minimizes ground loop inductance during surge events and ensures both pins share surge current equally. Failure to tie them together degrades clamping performance and may cause localized heating or premature failure under IEC 61000-4-5 stress.
Does the TSM24ADBZR meet IEC 61000-4-2 Level 4 ESD requirements?
Yes - the TSM24ADBZR is rated for ±30-kV contact discharge and ±30-kV air-gap discharge per IEC 61000-4-2, exceeding Level 4 (±8-kV contact / ±15-kV air) by significant margin. This makes it suitable for front-end protection in industrial equipment subject to frequent operator interaction, such as control panels, sensor junction boxes, and medical device connectors - without requiring additional ESD staging components.
What is the leakage current specification for the TSM24ADBZR at its rated working voltage?
The TSM24ADBZR has a maximum leakage current of 75 nA at 24 V (VRWM) and 25°C, with a typical value of 25 nA. This ultra-low leakage ensures minimal power drain and avoids loading effects on high-impedance circuits such as precision sensor bridges or battery-monitoring inputs. Leakage remains below 45 nA up to 125°C, preserving performance in thermally demanding industrial enclosures.
TSM24ADBZR 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V (Max)
- Voltage - Breakdown (Min):
- 24.8V
- Voltage - Clamping (Max) @ Ipp:
- 38V (Typ)
- Current - Peak Pulse (10/1000µs):
- 60A (8/20µs)
- Power - Peak Pulse:
- 2800W (2.8kW)
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 54pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TSM24ADBZR FAQ
1.How can I place an order for TSM24ADBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM24ADBZR 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 TSM24ADBZR reliable?
The price and inventory of TSM24ADBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM24ADBZR is usually 5 days.
3.What payment methods are accepted for TSM24ADBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM24ADBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM24ADBZR?
TSM24ADBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM24ADBZR 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 TSM24ADBZR?
For technical support, including TSM24ADBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM24ADBZR requirements.
6.How does Aetrix verify that TSM24ADBZR is sourced from the original manufacturer or authorized distributors?
All TSM24ADBZR 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 TSM24ADBZR meets industry standards.
7.What is the process for return or replacement of TSM24ADBZR?
All TSM24ADBZR units undergo pre-shipment inspection (PSI). If there is an issue with TSM24ADBZR, 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 TSM24ADBZR part is unused and in its original packaging.
Return procedure for TSM24ADBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM24ADBZR Tags
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