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Texas Instruments TSM36CADBZR
- Part No.:
- TSM36CADBZR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TSM36CADBZR.pdf
- Description:
- 36-V, BIDIRECTIONAL TVS SURGE PR
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
TSM36CADBZR from Texas Instruments is a bidirectional transient voltage suppression (TVS) diode in SOT-23 (DBZ) package, designed for robust ESD and surge protection of signal lines. It delivers ±30 kV IEC 61000-4-2 contact/air-gap ESD immunity, clamps at 55 V under 20 A (8/20 µs surge), and exhibits only 15 pF typical line capacitance and 100 nA max leakage - enabling high-fidelity protection in industrial 4–20 mA loops and sensor interfaces.
For engineers reviewing the TSM36CADBZR datasheet, TSM36CADBZR pinout, TSM36CADBZR application, or TSM36CADBZR equivalent, this page provides verified electrical specifications, validated SOT-23 pin mapping, real-world implementation context for field transmitters and lighting systems, and two confirmed alternative TVS diodes with documented parameter trade-offs.
Technical Context
The TSM36CADBZR operates as a clamping-type bidirectional TVS diode with symmetrical breakdown behavior (VBR = 37.8–44.2 V), triggered by overvoltage transients on either polarity. Its low dynamic resistance (1.0 Ω) ensures rapid voltage limiting during 8/20 µs surges up to 20 A, while maintaining a safe clamped voltage window (47–71 V) across operating current.
Designed for parallel connection across protected lines, it relies on reverse stand-off voltage (VRWM = ±36 V) to remain non-conductive during normal operation. The device's thermal design supports continuous operation from –55°C to +150°C, with RθJA = 204.4°C/W in the DBZ package - requiring careful PCB copper area planning for sustained surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clamping Voltage | 55 V at 20 A (8/20 µs); limits downstream IC stress to safe levels during lightning-induced surges |
| ESD Protection | ±30 kV contact & air-gap (IEC 61000-4-2); exceeds Level 4 standard for rugged industrial environments |
| Line Capacitance | 15 pF typical at 1 MHz; preserves signal integrity in high-speed analog sensor outputs and 4–20 mA loops |
| Leakage Current | ≤100 nA at +36 V; avoids loading precision current-loop receivers or battery-powered field devices |
| Breakdown Voltage | 37.8–44.2 V at 10 mA; defines reliable turn-on threshold without false triggering near 36 V system rails |
| Peak Pulse Power | 1400 W (8/20 µs); sustains single-event surge energy without degradation in PLC backplanes |
| Operating Temperature | –55°C to +150°C; qualified for under-hood automotive sensors and high-temp industrial enclosures |
Pinout & Package
SOT-23 (DBZ) 3-pin leaded package: 2.92 mm × 2.37 mm footprint, 1.12 mm max height, RoHS-compliant NiPdAu/Sn finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | I/O | Bidirectional surge path - connect both pins to protected line; symmetric clamping for ± transients |
| 3 | NC | No-connect terminal - must be left floating; grounding or routing causes performance degradation |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-5 Surge Rating | 20 A (8/20 µs) peak pulse current - protects against induced surges in long cable runs and outdoor installations |
| Low Capacitance Interface | 15 pF typical - enables use on high-bandwidth analog sensor outputs without signal distortion or bandwidth loss |
| Ultra-Low Leakage | 100 nA max at 36 V - prevents drift in precision 4–20 mA receiver circuits and extends battery life in wireless sensors |
| High-Temp Operation | Rated from –55°C to +150°C - supports deployment in motor control cabinets, lighting ballasts, and oil-field transmitters |
| SOT-23 Space Savings | ~50% smaller than SMA package - reduces PCB area in space-constrained modules like DIN-rail I/O terminals |
Applications
| Industrial Sensor Protection | 4–20 mA Loop Protection |
|---|---|
Use Scenario: Protecting analog output of temperature/pressure sensors exposed to ESD during field maintenance or lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at sensor connector entry point, shunting transients before reaching ADC or signal conditioner. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs while preserving 16-bit measurement accuracy via 15 pF capacitance. |
Use Scenario: Safeguarding PLC analog input modules receiving 4–20 mA signals from remote field transmitters over 100+ meter cables. IC Role / Device Role / Timing Role: Parallel-connected TVS on loop supply and return lines, absorbing common-mode surges induced by nearby switching loads or lightning. Use Value: Maintains loop integrity during 20 A surges without disrupting 4–20 mA calibration, enabled by stable 55 V clamping and <100 nA leakage. |
| LED Driver Protection | Field Transmitter Interface |
Use Scenario: Shielding constant-current LED drivers from ESD events during lamp replacement or surge coupling from adjacent AC wiring. IC Role / Device Role / Timing Role: TVS mounted across driver output terminals to clamp fast transients before reaching LED string or current-sense resistor. Use Value: Avoids false overcurrent shutdown or LED open-circuit faults by limiting voltage spikes to ≤55 V during 8/20 µs events. |
Use Scenario: Hardening HART-enabled 4–20 mA transmitters against ESD during handheld communicator docking and surge from shared power grounds. IC Role / Device Role / Timing Role: Dual-channel placement - one TSM36CADBZR on analog output, another on HART FSK signal line - with shared ground reference. Use Value: Ensures uninterrupted digital communication and analog accuracy by suppressing ±30 kV ESD without adding jitter or attenuation to 1.2/2.2 kHz FSK tones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | DO-214AC (SMA) package; 500 W PPPM; 64 V clamping at 12.3 A; 25 pF capacitance | Larger footprint; higher clamping voltage; unsuitable for high-density 4–20 mA PCBs or bandwidth-sensitive sensors | Choose when board space allows larger package and lower-cost procurement is prioritized over capacitance and clamping performance |
| TPD2E001DRYR | 2-channel unidirectional TVS in SOT-5X3; 12 V VRWM; 12 pF; 1 A surge rating | Lower voltage rating and surge capacity; intended for USB/low-voltage data lines, not 36 V industrial power rails | Use only for sub-15 V signal protection; not a functional substitute for TSM36CADBZR in 4–20 mA or field transmitter designs |
Compared with SMAJ36A and TPD2E001DRYR, the TSM36CADBZR uniquely combines 36 V standoff, 20 A surge capability, 15 pF capacitance, and SOT-23 size - making it the only option validated for high-reliability 4–20 mA loop protection where space, clamping voltage, and leakage current are simultaneously constrained.
Availability
TSM36CADBZR is available at Aetrix Electronics and suitable for industrial sensor protection, 4–20 mA loop hardening, and LED driver interface applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for TSM36CADBZR 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 communications markets since 1930.
The TSM36CADBZR belongs to TI's ESD and surge protection diode portfolio, engineered specifically for high-reliability industrial signal line protection where low capacitance, precise clamping, and extreme temperature resilience are mandatory.
FAQ
What is the maximum clamping voltage of the TSM36CADBZR under IEC 61000-4-5 surge conditions?
The TSM36CADBZR clamps to 55 V at 20 A under 8/20 µs surge waveform per IEC 61000-4-5. This value is measured IO-to-GND with specified test conditions and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events. The TSM36CADBZR maintains this clamping performance across its full operating temperature range.
Can the TSM36CADBZR be used in automotive applications?
The TSM36CADBZR itself is not AEC-Q100 qualified; however, its automotive-grade variant TSM36CA-Q1 is available for automotive use. The TSM36CADBZR is rated for –55°C to +150°C operation and meets IEC 61000-4-2/4-5 standards, making it suitable for under-hood industrial equipment but not certified for safety-critical automotive ECUs without additional qualification.
Why is Pin 3 of the TSM36CADBZR marked as NC and required to be left floating?
Pin 3 of the TSM36CADBZR is an internal no-connect terminal; grounding or routing it creates parasitic coupling paths that degrade ESD performance and increase leakage. TI's datasheet explicitly states "Leave this pin floating for proper performance." Violating this requirement risks exceeding the 100 nA leakage spec and reducing clamping consistency during surge events.
How does the 15 pF capacitance of the TSM36CADBZR affect 4–20 mA loop performance?
The 15 pF typical capacitance of the TSM36CADBZR introduces negligible phase shift or attenuation in standard 4–20 mA DC loops, which operate at near-zero frequency. Even in HART-enabled loops (1.2/2.2 kHz), this capacitance results in <0.1 Ω reactance - far below loop impedance - ensuring no impact on digital communication integrity or analog accuracy. The TSM36CADBZR is therefore fully compatible with HART and Foundation Fieldbus systems.
Is the TSM36CADBZR RoHS compliant and what is its moisture sensitivity level?
Yes, the TSM36CADBZR is RoHS compliant (lead-free, NiPdAu/Sn finish) and carries an MSL Level-1 rating (260°C peak reflow, unlimited floor life). This allows standard SMT assembly without dry-pack requirements or baking, simplifying manufacturing for industrial control and sensor module producers using the TSM36CADBZR in high-volume production.
TSM36CADBZR 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):
- 36V (Max)
- Voltage - Breakdown (Min):
- 37.8V
- Voltage - Clamping (Max) @ Ipp:
- 71V
- Current - Peak Pulse (10/1000µs):
- 20A (8/20µs)
- Power - Peak Pulse:
- 1400W (1.4kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 15pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TSM36CADBZR FAQ
1.How can I place an order for TSM36CADBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM36CADBZR 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 TSM36CADBZR reliable?
The price and inventory of TSM36CADBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM36CADBZR is usually 5 days.
3.What payment methods are accepted for TSM36CADBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM36CADBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM36CADBZR?
TSM36CADBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM36CADBZR 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 TSM36CADBZR?
For technical support, including TSM36CADBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM36CADBZR requirements.
6.How does Aetrix verify that TSM36CADBZR is sourced from the original manufacturer or authorized distributors?
All TSM36CADBZR 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 TSM36CADBZR meets industry standards.
7.What is the process for return or replacement of TSM36CADBZR?
All TSM36CADBZR units undergo pre-shipment inspection (PSI). If there is an issue with TSM36CADBZR, 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 TSM36CADBZR part is unused and in its original packaging.
Return procedure for TSM36CADBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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