My Inquiry
My Account
Diodes Incorporated SMF4L45CA-7
- Part No.:
- SMF4L45CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L45CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:3,826
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF4L45CA-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, rated for 45V working peak reverse voltage (VRWM), 50V minimum breakdown voltage (VBR), and 72.7A maximum peak pulse current (IRSM) under 10/1000µs waveform. It delivers 400W peak pulse power dissipation and clamps to ≤72.7V at rated surge, targeting ESD and lightning surge protection on low-voltage DC rails in automotive and industrial interfaces.
For engineers reviewing the SMF4L45CA-7 datasheet, SMF4L45CA-7 pinout, SMF4L45CA-7 application, or SMF4L45CA-7 equivalent, this part is selected for high-reliability bidirectional overvoltage suppression where compact size, ±30kV IEC61000-4-2 ESD robustness, and sub-5ns response time are critical - especially in battery management, USB-C port protection, and CAN/LIN bus line conditioning.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with no cathode band marking, enabling passive protection of AC-coupled or differential signal lines without polarity concerns. Its silicon avalanche structure achieves fast turn-on (<5.0ns from 0V to VBR min) and tight clamping (VC = 72.7V @ IRSM), minimizing voltage overshoot during transients.
Thermally optimized for surface-mount use on FR-4 PCBs, it features RθJA = 96°C/W and a 1.0W DC steady-state power rating. The device is qualified per JEDEC reliability standards and supports automotive-grade variants via Q-suffix derivatives manufactured in IATF 16949-certified facilities.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 45V - Maximum continuous reverse operating voltage before significant leakage; sets safe DC bias margin for protected line. |
| VBR (min) | 50V @ 1mA - Minimum breakdown threshold; ensures reliable conduction only above system's normal operating envelope. |
| VC (max) | 72.7V @ 72.7A - Clamped voltage under full-rated surge; defines worst-case overvoltage seen by downstream ICs. |
| PPK | 400W (10/1000µs) - Peak pulse power handling; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| ESD Rating | ±30kV air / ±30kV contact per IEC61000-4-2 - Full-system ESD immunity without external spark gaps or RC filters. |
| Response Time | <5.0ns (bi-directional) - Fast enough to clamp ESD events before logic-level ICs experience latch-up or gate oxide damage. |
| Package | DO-219AA - Ultra-compact 2.8 × 1.9 mm SMD outline; enables placement directly at connector entry points with minimal trace inductance. |
Pinout & Package
DO-219AA package: bi-directional two-terminal device with no polarity marking; terminals are symmetrical anode/cathode pair. Cathode band is absent - confirming bi-directional configuration per Diodes' marking convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals conduct identically during positive or negative surges; no orientation required during placement. |
| Case / Mold Compound | Thermal interface | Non-conductive plastic body; heat dissipation occurs solely through solder joints to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping symmetry | Enables single-device protection of differential buses (e.g., CAN H/L, RS-485 A/B) without polarity matching errors. |
| Green molding compound (UL 94V-0) | Halogen- and antimony-free formulation meets IPC-1752A environmental compliance for automotive and medical end equipment. |
| JEDEC-qualified high-reliability construction | Validated for extended temperature operation (–55°C to +175°C) and moisture sensitivity level 1 - suitable for under-hood automotive modules. |
| Low junction capacitance (typ. 100pF at 0V) | Minimizes signal distortion on data lines up to 10 Mbps; avoids bandwidth degradation in USB 2.0 or LIN physical layers. |
Applications
| Battery Management Systems (BMS) | Automotive LIN Bus Protection |
|---|---|
|
Use Scenario: Protecting cell monitor IC inputs and pack voltage sense lines from load dump and jump-start transients in 12V/48V hybrid architectures. IC Role / Device Role / Timing Role: Passive clamping element placed at PCB edge connector; conducts surge energy to ground plane within 5ns. Use Value: Maintains VRWM margin above 48V nominal rail while limiting clamped voltage to 72.7V - preserving 100V-rated op-amps and ADC front-ends. |
Use Scenario: Safeguarding LIN transceiver pins against ESD events during vehicle assembly, service, or electromagnetic coupling from adjacent high-current wiring. IC Role / Device Role / Timing Role: Bi-directional shunt protector tied between LIN bus and chassis ground; responds equally to positive/negative transients. Use Value: Delivers ±30kV contact ESD immunity without degrading 19.2 kbps signal integrity - verified per ISO 16750-2 and ISO 10605 test profiles. |
| USB Type-C Port Protection | Industrial Sensor Interface Lines |
|
Use Scenario: Securing VBUS, CC, and SBU lines in compact USB-C receptacles against hot-plug ESD and cable-induced surges. IC Role / Device Role / Timing Role: First-line defense mounted directly at connector footprint; clamps before transients reach USB PD controller or multiplexer. Use Value: DO-219AA footprint fits within 2.5mm board edge clearance; 72.7V VC ensures safe operation below USB PD 5V–20V negotiation voltages. |
Use Scenario: Shielding 4–20mA analog sensor outputs and digital IO lines in factory automation PLCs exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Low-leakage (≤0.5µA @ 45V) shunt TVS placed at terminal block entry; blocks >1kV transients without loading signal path. Use Value: 400W surge rating handles repetitive 10/1000µs surges per IEC 61000-4-4 Level 3 - extending field sensor lifetime in harsh EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-13-F (Diodes Inc.) | DO-214AC package; higher RθJA (120°C/W); same VRWM/VBR/VC ratings. | Larger footprint (4.3 × 2.6 mm) limits routing density near connectors. | Select when legacy SMA layout exists or thermal derating margin exceeds 20%. |
| TPSMD45CA (Texas Instruments) | Same DO-219AA package; tighter VC tolerance (72.7V max vs. 73.0V); lower IR (0.2µA @ 45V). | Higher cost; limited availability in <3k reel quantities. | Prefer for ultra-low-leakage requirements in precision analog sensor front-ends. |
Compared with SMAJ45CA-13-F, SMF4L45CA-7 saves >50% board area and improves thermal coupling; versus TPSMD45CA, it offers broader distribution and identical surge performance at lower unit cost - making it optimal for high-volume automotive and industrial designs.
Availability
SMF4L45CA-7 is available at Aetrix Electronics and suitable for battery management systems, automotive LIN bus nodes, and USB Type-C port protection requiring stable component supply across multi-year production cycles.
Supply support for SMF4L45CA-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US and manufacturing in IATF 16949-certified facilities.
The SMF4L series belongs to Diodes' high-power surface-mount TVS portfolio, engineered specifically for space-constrained, high-reliability transient suppression in automotive, industrial, and consumer electronics - emphasizing ESD hardness, thermal efficiency, and AEC-Q readiness.
FAQ
Is SMF4L45CA-7 unidirectional or bidirectional?
SMF4L45CA-7 is a bi-directional TVS diode, confirmed by its "CA" suffix and absence of cathode band marking per Diodes' datasheet. It provides symmetrical clamping for both positive and negative transients, making it suitable for AC-coupled or differential signal lines like CAN, LIN, or USB D+/D− without polarity constraints.
What is the maximum clamping voltage at rated surge current?
The maximum clamping voltage (VC) for SMF4L45CA-7 is 72.7V at 72.7A peak pulse current (10/1000µs waveform), measured per standard test conditions in DS43394 Rev. 3-2. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Does SMF4L45CA-7 meet automotive qualification standards?
SMF4L45CA-7 itself is not AEC-Q200 qualified, but Diodes offers automotive-grade equivalents (e.g., SMF4L45CQ-7) with PPAP capability, manufactured in IATF 16949-certified facilities and qualified per AEC-Q200 stress tests. The base part shares identical electrical specs and packaging but lacks formal automotive change control documentation.
How does its DO-219AA package compare thermally to SMA (DO-214AC)?
DO-219AA offers lower thermal resistance than SMA: RθJA = 96°C/W versus 120°C/W for SMAJ45CA-13-F. This 20% improvement allows higher sustained surge duty cycles or operation in hotter ambient environments without exceeding junction temperature limits, validated per JEDEC JESD51-2 thermal testing methodology.
SMF4L45CA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-219AA
- Series:
- SMF4L
- 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):
- 5.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-219AA
SMF4L45CA-7 FAQ
1.How can I place an order for SMF4L45CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L45CA-7 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 SMF4L45CA-7 reliable?
The price and inventory of SMF4L45CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L45CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L45CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L45CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L45CA-7?
SMF4L45CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L45CA-7 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 SMF4L45CA-7?
For technical support, including SMF4L45CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L45CA-7 requirements.
6.How does Aetrix verify that SMF4L45CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L45CA-7 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 SMF4L45CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L45CA-7?
All SMF4L45CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L45CA-7, 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 SMF4L45CA-7 part is unused and in its original packaging.
Return procedure for SMF4L45CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L45CA-7 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…
