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Diodes Incorporated SMBJ45CA-13-F
- Part No.:
- SMBJ45CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CA-13-F.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:61,842
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Product details
Overview
SMBJ45CA-13-F from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in SMB package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V reverse standoff voltage (VRWM), 50.0–57.5 V breakdown voltage (VBR), 72.7 V maximum clamping voltage at 8.3 A peak pulse current, and 600 W peak pulse power dissipation per 10/1000 µs waveform - deployed in industrial power supplies, automotive body control modules, and PoE-powered equipment.
For engineers reviewing the SMBJ45CA-13-F datasheet, SMBJ45CA-13-F pinout, SMBJ45CA-13-F application, or SMBJ45CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC ratings, unidirectional vs. bi-directional polarity requirements for AC-coupled or bidirectional data lines, and thermal derating above +25°C ambient.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC signals, differential buses (e.g., RS-485, CAN), and floating power domains without polarity constraints. Its glass-passivated junction ensures stable leakage (<5.0 µA at VRWM) and repeatable breakdown behavior under surge stress.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards when applied with appropriate PCB layout and series impedance. Its 1.0 mA test current for VBR measurement and 8.3 ms half-sine surge rating align with standard lightning/surge test profiles used in industrial and telecom applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W (10/1000 µs waveform; defines maximum transient energy absorption capability) |
| Reverse Standoff Voltage | 45.0 V (maximum continuous DC or RMS voltage before significant leakage begins) |
| Breakdown Voltage | 50.0–57.5 V (VBR range at 1.0 mA IT; confirms reliable turn-on threshold for clamping) |
| Clamping Voltage | 72.7 V (VC at IPP = 8.3 A; determines maximum voltage seen by downstream circuit during surge) |
| Peak Pulse Current | 8.3 A (IPP at VC = 72.7 V; quantifies surge current handling under defined waveform) |
| Leakage Current | <5.0 µA at 45 V (IR; ensures minimal power loss and signal integrity degradation in standby) |
| Operating Temperature | −55°C to +150°C (TJ; supports deployment in under-hood automotive and industrial environments) |
Pinout & Package
Package: SMB (Surface-Mount Small Outline), molded plastic case rated UL 94V-0, 0.1 g mass, lead-free matte tin plating, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge conduction path | No polarity marking; terminals interchangeable - enables AC line or differential pair protection without orientation constraints |
| Cathode Band (absent) | Polarity indicator | Omitted on bi-directional variants; confirms symmetrical construction and eliminates installation error risk |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables single-device protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V systems |
| Glass-passivated die | Ensures long-term parameter stability and low leakage drift across temperature and humidity cycles |
| Bi-directional configuration | Supports protection of AC-coupled interfaces (e.g., Ethernet PHY, RS-485) without external polarity management |
| RoHS-compliant & halogen-free | Fulfills IPC-1752A material declaration requirements and EU environmental compliance mandates |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Protection of 24 V DC input channels against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of input conditioning circuitry and microcontroller GPIO protection networks. Use Value: Limits transient voltage to ≤72.7 V, preventing damage to 3.3 V/5 V logic-level interface ICs and analog front-end components. |
Use Scenario: Guarding LIN bus transceivers and sensor supply lines against battery reversal and jump-start spikes. IC Role / Device Role / Timing Role: Fast-response shunt element that activates within nanoseconds to divert >100 V transients away from sensitive analog and digital ICs. Use Value: Maintains system uptime by surviving repeated 12 V/24 V automotive transients per ISO 7637-2 Pulse 1, 2a, and 5a. |
| POE-Powered Network Devices | RS-485 Communication Interfaces |
Use Scenario: Safeguarding IEEE 802.3af/at power sourcing equipment (PSE) and powered devices (PD) from cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp on DC power pairs (pins 4–5 and 7–8), operating independently of data polarity. Use Value: Prevents latch-up or burnout of PD controller ICs (e.g., TPS2375) during field-deployed surge events up to 600 W. |
Use Scenario: Protecting full-duplex RS-485 transceivers (e.g., MAX1487) connected to long outdoor cables exposed to ESD and lightning coupling. IC Role / Device Role / Timing Role: Symmetric clamping element across A/B differential lines, referenced to local ground. Use Value: Ensures communication continuity by limiting common-mode and differential-mode overvoltages below transceiver absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-13-F | Unidirectional; cathode band marking; 5.0 µA IR at 45 V (vs. same for bi-directional) | Requires correct polarity alignment; unsuitable for AC or floating differential lines | Select only when protecting DC rails with known polarity and no reverse-voltage risk |
| SMAJ45CA | Same electrical specs but SMA package; lower 400 W PPK rating; 0.05 g mass | Reduced surge energy handling; limited to lower-risk consumer-grade applications | Choose only if board space constraints prohibit SMB footprint and surge threat level is ≤IEC 61000-4-5 Level 2 |
Compared with SMBJ45A-13-F and SMAJ45CA, SMBJ45CA-13-F uniquely delivers bi-directional surge clamping in the industry-standard SMB form factor with full 600 W rating - making it the optimal choice for AC-coupled, differential, or polarity-agnostic protection where reliability and footprint compatibility are critical.
Availability
SMBJ45CA-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and PoE-powered network devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing traceability.
Supply support for SMBJ45CA-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
This device belongs to Diodes' SMBJ series of surface-mount TVS diodes - engineered specifically for high-energy transient suppression in harsh industrial, automotive, and communications environments where reliability and standardized packaging are essential.
FAQ
What is the maximum clamping voltage for SMBJ45CA-13-F at its rated peak pulse current?
The maximum clamping voltage (VC) is 72.7 V at a peak pulse current (IPP) of 8.3 A, measured using the 10/1000 µs double-exponential waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during surge events.
Is SMBJ45CA-13-F compatible with lead-free reflow soldering processes?
Yes - it features matte tin lead-free plating compliant with JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for standard Pb-free reflow profiles (peak temperature ≤260°C). The SMB package's thermal mass and UL 94V-0 molding compound ensure reliability through multiple reflow cycles without delamination or parameter shift.
How does SMBJ45CA-13-F differ from unidirectional SMBJ45A-13-F in circuit implementation?
SMBJ45CA-13-F has no cathode band and conducts identically in both directions, eliminating polarity-dependent placement errors. In contrast, SMBJ45A-13-F requires correct anode/cathode orientation relative to DC rail polarity and cannot protect AC or floating nodes - making the 'C' variant mandatory for RS-485, LIN, or PoE applications.
Can SMBJ45CA-13-F be used to meet IEC 61000-4-2 ESD immunity requirements?
Yes - its sub-nanosecond response time and low clamping voltage enable effective protection against ±8 kV contact and ±15 kV air discharge per IEC 61000-4-2. When placed within 2 mm of the connector with short, low-inductance traces and proper grounding, it reliably prevents ESD-induced latch-up or gate oxide failure in downstream ICs.
SMBJ45CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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
SMBJ45CA-13-F FAQ
1.How can I place an order for SMBJ45CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CA-13-F 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 SMBJ45CA-13-F reliable?
The price and inventory of SMBJ45CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CA-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ45CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CA-13-F?
SMBJ45CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CA-13-F 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 SMBJ45CA-13-F?
For technical support, including SMBJ45CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CA-13-F requirements.
6.How does Aetrix verify that SMBJ45CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ45CA-13-F 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 SMBJ45CA-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ45CA-13-F?
All SMBJ45CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CA-13-F, 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 SMBJ45CA-13-F part is unused and in its original packaging.
Return procedure for SMBJ45CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CA-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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