My Inquiry
My Account
STMicroelectronics SMBJ24A-TR
- Part No.:
- SMBJ24A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24A-TR.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:35,945
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ24A-TR from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode in SMB package, designed for primary-level ESD and surge protection of DC power rails and signal lines. It features a 24 V standoff voltage (VRM), 26.7 V minimum breakdown voltage (VBR), 38.9 V clamping voltage (VCL) at 16 A peak pulse current (IPP), and operates up to 150 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMBJ24A-TR datasheet, SMBJ24A-TR pinout, SMBJ24A-TR application, or SMBJ24A-TR equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low leakage (<0.2 µA @ 25 °C), UL497B recognition for isolated loop circuits, and compatibility with IPC7531 footprints on FR4 PCBs.
Technical Context
This TVS diode uses planar silicon technology to achieve stable reverse leakage and high thermal robustness. Its unidirectional configuration enables asymmetric clamping - conducting only during positive transients while blocking reverse DC bias - making it suitable for single-polarity rail protection such as 24 V industrial sensors and CAN bus power lines.
The device meets IEC 61000-4-2 level 4 (±30 kV contact/air discharge) and IEC 61000-4-4 level 4 (4 kV), with dynamic resistance (RD) of 0.587 Ω at 25 °C. Its junction capacitance is 120 pF at 0 V (f = 1 MHz), confirmed via manufacturer test data for SMBJ24A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 24 V - maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 26.7–28.1 V @ 1 mA - precise threshold where avalanche conduction initiates reliably |
| Clamping Voltage (VCL) | 38.9 V @ 16 A (10/1000 µs) - limits transient voltage seen by protected ICs to safe levels |
| Peak Pulse Power (PPP) | 600 W @ 10/1000 µs - sustains short-duration surges without failure in typical industrial environments |
| Leakage Current (IRM) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - ensures minimal power loss and signal integrity in low-power sensor interfaces |
| Junction Temperature Range | −55 to +150 °C - supports operation in under-hood automotive and high-temperature industrial enclosures |
| UL Recognition | UL497B (file E136224) - certified for use as an isolated loop circuit protector in safety-critical systems |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal device with matte tin-plated leads compliant with J-STD-020 MSL Level 1 and IPC7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Anode-to-cathode polarity reference | Connects to protected line; conducts during positive transients relative to ground |
| Anode | Reference terminal | Typically tied to system ground or low-impedance return path for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| High Surge Robustness | Withstands 4 kW (8/20 µs) pulses - critical for lightning-induced surges in outdoor equipment |
| Low Clamping Ratio | VCL/VBR = 1.46 - tight voltage limiting preserves margin for downstream 3.3 V or 5 V logic |
| Thermal Stability | αT = 9.6 × 10⁻⁴ /°C - predictable VBR drift over temperature avoids false triggering |
| ESD Hardness | Exceeds IEC 61000-4-2 level 4 (±30 kV) - eliminates need for secondary ESD components on front-end connectors |
| Lead-Free & RoHS Compliant | Matte tin plating per JESD 22-B102 E3 - ensures reliable solderability and whisker resistance |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: 24 V DC input channels exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point before protection ICs or microcontrollers. Use Value: Limits transient voltage to ≤38.9 V, preventing latch-up in 3.3 V IO buffers and extending system uptime in factory-floor environments. |
Use Scenario: Power supply rail protection for BCM microcontrollers and LIN transceivers. IC Role / Device Role / Timing Role: Unidirectional TVS on switched 24 V battery feed, absorbing load dump spikes and ISO 7637-2 pulse 5a. Use Value: Maintains <0.2 µA leakage at ambient temperature, avoiding battery drain in always-on vehicle subsystems. |
| Telecom Remote Power Feeds | Medical Diagnostic Sensor Interfaces |
|
Use Scenario: 24 V PoE-like power delivery over long cables subject to induced surges. IC Role / Device Role / Timing Role: First-stage clamping on DC input before DC-DC converters and isolation barriers. Use Value: 600 W (10/1000 µs) rating handles repetitive surges from nearby lightning strikes without degradation. |
Use Scenario: Protection of analog front-end inputs in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Low-capacitance (120 pF) TVS on 24 V bias rails feeding precision op-amps and ADC drivers. Use Value: Prevents ESD damage during handling while introducing negligible signal distortion due to stable junction capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA-TR | Bidirectional variant; symmetric clamping for AC-coupled or dual-polarity lines | Required where both positive and negative transients occur (e.g., RS-485 data lines) | Select only if bidirectional protection is needed; otherwise, SMBJ24A offers lower leakage and tighter VBR tolerance |
| SMAJ24A-TR | Lower PPP (400 W), larger package (SMA/DO-214AC), higher RD (0.728 Ω) | Suitable for cost-sensitive, lower-energy applications with less stringent thermal constraints | Use when board space allows SMA and surge energy rarely exceeds 400 W; avoid in high-reliability 24 V rail protection |
Compared with SMBJ24CA-TR and SMAJ24A-TR, SMBJ24A-TR delivers optimal balance of clamping precision (VCL = 38.9 V), thermal resilience (150 °C Tj max), and UL497B certification - making it preferred for safety-rated 24 V industrial and automotive power rail protection.
Availability
SMBJ24A-TR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom remote power feeds, and medical diagnostic sensor interfaces requiring stable component supply across extended product lifecycles.
Supply support for SMBJ24A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability DC rail and interface protection where low leakage, precise clamping, and regulatory compliance (UL497B, IEC 61000-4-2/4) are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ24A-TR under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 38.9 V at 16 A peak pulse current under 10/1000 µs waveform conditions, measured at 25 °C ambient and confirmed in Table 2 of DS1283 Rev 14. This value increases predictably with junction temperature using αT = 9.6 × 10⁻⁴ /°C.
Does SMBJ24A-TR meet automotive-grade reliability requirements?
SMBJ24A-TR is not AEC-Q200 qualified, but its −55 to +150 °C operating junction range, UL497B recognition, and IEC 61000-4-4 level 4 compliance make it widely used in non-safety-critical automotive applications such as body control modules and infotainment power rails - pending customer qualification.
How does SMBJ24A-TR differ from SMBJ24CA-TR in circuit implementation?
SMBJ24A-TR is unidirectional and must be oriented with cathode toward the protected line; SMBJ24CA-TR is bidirectional and symmetrical, allowing placement without polarity concern. The latter exhibits identical VBR and VCL in both directions but higher leakage (1 µA @ 85 °C vs. 0.2 µA for SMBJ24A).
Can SMBJ24A-TR be used in parallel for higher surge current handling?
No - parallel connection is not recommended due to mismatched VBR tolerances (±5%) causing uneven current sharing. For higher energy handling, select a higher-rated part like SMBJ33A or implement staged protection with upstream MOVs and downstream TVS diodes.
SMBJ24A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 16A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMBJ24A-TR FAQ
1.How can I place an order for SMBJ24A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24A-TR 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 SMBJ24A-TR reliable?
The price and inventory of SMBJ24A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24A-TR is usually 5 days.
3.What payment methods are accepted for SMBJ24A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24A-TR?
SMBJ24A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24A-TR 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 SMBJ24A-TR?
For technical support, including SMBJ24A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24A-TR requirements.
6.How does Aetrix verify that SMBJ24A-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ24A-TR 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 SMBJ24A-TR meets industry standards.
7.What is the process for return or replacement of SMBJ24A-TR?
All SMBJ24A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24A-TR, 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 SMBJ24A-TR part is unused and in its original packaging.
Return procedure for SMBJ24A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ24A-TR 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…
