My Inquiry
My Account
Texas Instruments ESDS552DBZR
- Part No.:
- ESDS552DBZR
- Manufacturer:
- Texas Instruments
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ESDS552DBZR.pdf
- Description:
- 12V TWO-CHANNEL BIDIRECTIONAL ES
- Quantity:
- Payment:
- Shipping:
Inventory:4,196
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ESDS552DBZR from Texas Instruments is a bidirectional transient voltage suppression (TVS) diode designed for RS-485/RS-422 interface protection. It features 12V working voltage, ±30kV IEC 61000-4-2 ESD rating (contact/air), 25A 8/20μs surge capability, and low 9.5–11pF line capacitance - enabling robust signal integrity in industrial communication links.
For engineers reviewing the ESDS552DBZR datasheet, ESDS552DBZR pinout, ESDS552DBZR application, or ESDS552DBZR equivalent, key selection criteria include clamping voltage under 24V at 20A surge, bidirectional polarity support, SOT-23 (DBZ) package compatibility with AOI, and compliance with IEC 61000-4-2/4-5 for factory automation and grid infrastructure deployments.
Technical Context
The ESDS552DBZR operates as a snapback-type TVS diode with symmetrical bidirectional conduction between I/O pins and GND. Its breakdown voltage (13.2–18V) ensures reliable triggering above 12V working voltage while maintaining low dynamic resistance (0.38–0.4Ω) to minimize clamping overshoot during transients.
Designed specifically for differential bus protection, it connects across A/Y and B/Z lines of RS-485 transceivers with GND reference. The device sustains operation from –40°C to +125°C and delivers 500W peak pulse power at 25°C per IEC 61000-4-5, supporting high-reliability industrial environments without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VRWM) | ±12V - defines maximum continuous DC or RMS signal swing before leakage exceeds 50nA |
| ESD Rating (IEC 61000-4-2) | ±30kV contact / ±30kV air - exceeds standard immunity requirements for human-handling events |
| Surge Current (IEC 61000-4-5) | 25A (8/20μs) - withstands lightning-induced surges on field wiring without failure |
| Clamping Voltage (VCLAMP) | 23.5V at 20A - limits downstream IC stress to safe levels during worst-case surge |
| Line Capacitance (CLine) | 9.5–11pF at 1MHz - preserves signal rise/fall times and minimizes jitter on 10–20Mbps RS-485 links |
| Dynamic Resistance (RDYN) | 0.38–0.4Ω - ensures low voltage drop across device during transient conduction |
| Operating Temperature | –40°C to +125°C - supports deployment in uncontrolled industrial enclosures and outdoor grid nodes |
Pinout & Package
ESDS552DBZR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92mm × 2.37mm with 1.12mm max height, optimized for automated optical inspection and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | I/O | Protected signal terminal - connects to one side of differential pair (e.g., RS-485 A/Y) |
| Pin 2 | I/O | Protected signal terminal - connects to opposite side of differential pair (e.g., RS-485 B/Z) |
| Pin 3 | GND | Low-inductance ground return path - must be routed directly to system ground plane with minimal trace length |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ESD/Surge Protection | Single-component solution for both polarities - eliminates need for dual-diode arrays or external polarity management |
| Low Clamping Voltage | VCLAMP ≤23.5V at 20A - keeps protected transceiver within absolute maximum ratings during surge events |
| Low Line Capacitance | 9.5–11pF - enables use on high-speed RS-485 links up to 20Mbps without signal distortion |
| SOT-23 Leadframe Package | DBZ variant with standard lead pitch - supports reflow soldering, AOI, and legacy assembly processes |
| IEC 61000-4-5 Compliance | 25A 8/20μs surge handling - meets Level 4 immunity for industrial equipment connected to long cables |
Applications
| Factory Automation Interface | Building HVAC Control Network |
|---|---|
Use Scenario: Protecting RS-485 daisy-chain networks connecting PLCs, I/O modules, and sensors in manufacturing cells. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed at transceiver input to shunt ESD and surge energy to ground before reaching sensitive logic. Use Value: Prevents field failures caused by operator ESD events or induced surges from nearby motor drives, extending mean time between failures (MTBF). | Use Scenario: Securing communication between thermostats, VAV controllers, and BACnet gateways in commercial HVAC systems. IC Role / Device Role / Timing Role: Signal-line protector on RS-422/RS-485 backbones running through shared conduits with AC power lines. Use Value: Maintains data integrity during lightning-induced transients on rooftop units or chiller plant wiring without adding latency or skew. |
| Grid Infrastructure Monitoring | Security System Access Control Bus |
Use Scenario: Shielding SCADA telemetry links between substation RTUs and central control centers over kilometers of exposed cabling. IC Role / Device Role / Timing Role: Primary surge clamp at endpoint transceivers, coordinated with upstream gas discharge tubes for staged protection. Use Value: Enables compliance with IEC 61000-4-5 Level 4 (25A) without requiring board-level redesign or larger footprints. | Use Scenario: Hardening RS-485 buses linking door controllers, card readers, and alarm panels in multi-building security deployments. IC Role / Device Role / Timing Role: Low-capacitance ESD suppressor mounted directly at connector entry points to prevent latch-up in access control ASICs. Use Value: Eliminates false alarms and lockouts triggered by static discharge during badge swipes or environmental dry-air conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA | Unidirectional configuration; higher 12.5V VRWM but requires dual placement for bidirectional coverage | Lacks integrated bidirectionality - increases component count and layout complexity on differential lines | Select only if existing design uses discrete unidirectional TVS and cannot accommodate revised routing for single-device placement |
| TPD2E001DRSR | Lower 2.5V VRWM; rated for ±8kV IEC 61000-4-2 - insufficient for industrial surge immunity | Targeted at USB/low-voltage data lines; not validated for RS-485 bus voltage margins or 25A surge | Use only in consumer-grade serial interfaces where 12V working voltage and 25A surge are not required |
Compared with SMAJ12CA and TPD2E001DRSR, ESDS552DBZR uniquely combines 12V bidirectional operation, ±30kV ESD rating, and 25A surge capability in a single SOT-23 footprint - making it the only option that satisfies full IEC 61000-4-2/4-5 compliance for industrial RS-485 endpoints without layout or BOM revision.
Availability
ESDS552DBZR is available at Aetrix Electronics and suitable for factory automation, building HVAC control, and grid infrastructure applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for ESDS552DBZR 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 ESDS552DBZR belongs to TI's industrial-grade ESD protection portfolio, engineered specifically to meet stringent IEC 61000-4-x immunity requirements for RS-485/RS-422 differential bus interfaces in harsh electromagnetic environments.
FAQ
What is the primary circuit role of the ESDS552DBZR in an RS-485 system?
The ESDS552DBZR serves as a bidirectional transient voltage suppressor placed across the A/Y and B/Z differential signal lines of an RS-485 transceiver. It provides low-impedance shunting of ESD and surge energy to ground, clamping transient voltages to ≤23.5V at 20A while maintaining signal integrity via its 9.5–11pF capacitance. This protects downstream transceiver ICs from damage without affecting normal 12V-biased bus operation.
Does the ESDS552DBZR require external biasing or control signals to function?
No, the ESDS552DBZR is a passive, self-triggering TVS diode with no external bias or enable requirements. It remains in high-impedance standby mode below ±12V (VRWM), drawing only ≤50nA leakage current. When a transient exceeds its breakdown threshold (13.2–18V), it snaps back into low-resistance conduction automatically - making ESDS552DBZR fully autonomous and compatible with all RS-485 transceiver families without firmware or hardware modification.
Can the ESDS552DBZR be used on RS-422 interfaces, and how does its performance compare?
Yes, the ESDS552DBZR is explicitly qualified for RS-422 protection per its datasheet. Its bidirectional 12V standoff, ±30kV ESD rating, and 25A surge capability apply identically to RS-422's balanced differential signaling. Since RS-422 typically operates at lower data rates and shorter distances than RS-485, the ESDS552DBZR's 9.5–11pF capacitance poses no timing constraint - ensuring identical protection efficacy on both standards without derating or layout changes.
What is the thermal performance limit of the ESDS552DBZR during repeated surge events?
The ESDS552DBZR has a junction-to-ambient thermal resistance (RθJA) of 244.1°C/W in its SOT-23 (DBZ) package. Under single-pulse 25A 8/20μs surge conditions, temperature rise is negligible due to short duration. However, for repetitive surges (>1Hz), PCB copper area and thermal vias become critical - TI recommends ≥100mm² of 2oz copper connected to Pin 3 (GND) to maintain junction temperature below 125°C and ensure long-term reliability of ESDS552DBZR.
How does the ESDS552DBZR's clamping voltage compare to competing TVS diodes at 20A surge current?
At 20A (8/20μs), the ESDS552DBZR clamps to ≤23.5V - significantly lower than industry-standard alternatives like SMAJ12CA (≥30V) or P6SMB12CA (≥32V). This 6–8.5V margin directly translates to safer operating headroom for RS-485 transceivers with 30–36V absolute maximum ratings. The ESDS552DBZR achieves this via optimized silicon geometry and low dynamic resistance (0.38–0.4Ω), making it uniquely suited for high-reliability industrial deployments where voltage margin is non-negotiable.
ESDS552DBZR 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:
- 2
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.2V
- Voltage - Clamping (Max) @ Ipp:
- 23.5V
- Current - Peak Pulse (10/1000µs):
- 25A (8/20µs)
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 9.5pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ESDS552DBZR FAQ
1.How can I place an order for ESDS552DBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for ESDS552DBZR 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 ESDS552DBZR reliable?
The price and inventory of ESDS552DBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ESDS552DBZR is usually 5 days.
3.What payment methods are accepted for ESDS552DBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ESDS552DBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ESDS552DBZR?
ESDS552DBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ESDS552DBZR 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 ESDS552DBZR?
For technical support, including ESDS552DBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ESDS552DBZR requirements.
6.How does Aetrix verify that ESDS552DBZR is sourced from the original manufacturer or authorized distributors?
All ESDS552DBZR 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 ESDS552DBZR meets industry standards.
7.What is the process for return or replacement of ESDS552DBZR?
All ESDS552DBZR units undergo pre-shipment inspection (PSI). If there is an issue with ESDS552DBZR, 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 ESDS552DBZR part is unused and in its original packaging.
Return procedure for ESDS552DBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ESDS552DBZR Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
