My Inquiry
My Account
Diodes Incorporated SMF4L43CA-7
- Part No.:
- SMF4L43CA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-219AA
- Datasheet:
-
SMF4L43CA-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:8,325
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMF4L43CA-7 from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in DO-219AA package, designed for high-energy ESD and surge protection on signal/power lines. It features 43V working peak reverse voltage (VRWM), 47.8–52.8V breakdown voltage (VBR), 69.4V maximum clamping voltage (VC) at 5.7A peak pulse current, and 400W peak pulse power dissipation (10/1000µs waveform). It is used in automotive battery contacts and industrial power management interfaces requiring IEC61000-4-2 ±30kV air/contact ESD immunity.
For engineers reviewing the SMF4L43CA-7 datasheet, SMF4L43CA-7 pinout, SMF4L43CA-7 application, or SMF4L43CA-7 equivalent, this page delivers verified electrical parameters, DO-219AA terminal mapping, real-world clamping performance data, and validated alternatives for bidirectional overvoltage protection in compact surface-mount designs.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with no cathode band marking per mechanical drawing. Its silicon avalanche structure enables sub-5ns response time from 0V to VBR min, ensuring fast suppression of transients induced by load dump, inductive switching, or ESD events.
Thermal design relies on low junction-to-solder-point thermal resistance (RθJS = 70°C/W) and 1.0W DC power dissipation capability, enabling reliable operation at TJ up to +175°C when mounted on FR-4 PCB with 2 oz. copper pads - critical for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 43V - Maximum continuous reverse operating voltage before clamping begins; defines safe standoff for 48V system interfaces. |
| VBR (min/max) | 47.8V / 52.8V @ 1A - Confirmed avalanche onset range; ensures predictable turn-on margin above VRWM. |
| VC @ IPP | 69.4V @ 5.7A - Measured clamping voltage during 10/1000µs surge; limits downstream IC stress to <70V. |
| PPK | 400W - Peak pulse power rating per JEDEC-standard 10/1000µs waveform; supports ISO 7637-2 Pulse 1/2/5a robustness. |
| ESD Rating | ±30kV contact & air (IEC61000-4-2) - Validated immunity level for human-body-model surges in handheld and vehicle-mounted electronics. |
| Operating Temp | −55°C to +175°C - Qualified for extended automotive under-hood and industrial control cabinet deployment. |
| Package | DO-219AA - Surface-mount flat lead package (2.80 × 1.90 mm), optimized for automated placement and high-density PCB layouts. |
Pinout & Package
DO-219AA is a two-terminal, symmetrical SMD package with no polarity marking for bi-directional devices. Terminals are co-planar matte tin-plated copper alloy leads, compatible with standard reflow profiles and RoHS-compliant assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; bidirectional clamping occurs regardless of voltage polarity applied. |
| Case (exposed metal pad) | Thermal & mechanical interface | Not electrically connected; provides low-thermal-resistance path to PCB copper for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating differential lines without polarity concerns. |
| 400W surge handling | Sustains high-energy transients (e.g., ISO 7637-2 Pulse 5a) without degradation in automotive power nets. |
| ±30kV ESD immunity | Meets highest IEC61000-4-2 contact discharge requirement for exposed connectors and buttons. |
| DO-219AA footprint | Reduces board area by ~30% vs. SMA/SMB packages while maintaining thermal performance via enhanced pad coupling. |
| Halogen & antimony free | Complies with JEDEC JS709E and IPC-1752A green material standards for automotive supply chain traceability. |
Applications
| Automotive Battery Interface | Industrial CAN Bus Termination |
|---|---|
|
Use Scenario: Protection of 12V/48V battery feed lines against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and microcontroller power rails. Use Value: Limits voltage excursion to ≤69.4V during 5.7A surge, preventing latch-up or permanent damage to downstream PMICs. |
Use Scenario: ESD and surge protection on CAN_H/CAN_L differential pairs in factory automation nodes. IC Role / Device Role / Timing Role: Bi-directional shunt element across bus lines, activated within <5ns of transient onset. Use Value: Maintains signal integrity by clamping common-mode surges without affecting 1Mbps CAN timing margins. |
| USB Type-C Power Delivery Port | Smart Meter Voltage Sensing Input |
|
Use Scenario: Overvoltage safeguard on VBUS line during hot-plug events and adapter fault conditions. IC Role / Device Role / Timing Role: First-line transient suppressor between connector and USB PD controller's input stage. Use Value: Absorbs 400W pulses while holding VBUS below 70V, avoiding brownout or reset of PD policy engine. |
Use Scenario: Protection of precision ADC inputs measuring grid voltage in residential smart meters. IC Role / Device Role / Timing Role: Low-leakage (0.5µA @ 43V) clamp that avoids DC offset error in measurement path. Use Value: Enables direct connection to 230VAC-derived sensing circuits with minimal impact on 16-bit ADC accuracy. |
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 |
|---|---|---|---|
| SMAJ43CA-TP | Same VRWM/VBR/VC specs but in larger SMA package (DO-214AC); RθJA = 96°C/W vs. 70°C/W for DO-219AA. | Lower power density; less suitable for thermally constrained automotive modules. | Select when legacy SMA footprint compatibility is required and thermal headroom exceeds 25°C. |
| SP1003-043 | 43V bi-directional TVS with lower PPK (300W) and higher VC (77V @ 4.5A); polymer-based vs. silicon avalanche. | Slower response (>100ns); unsuitable for fast ESD or high-speed data line protection. | Prefer only for cost-sensitive consumer-grade applications where 400W surge immunity is not mandated. |
Compared with SMAJ43CA-TP and SP1003-043, SMF4L43CA-7 delivers superior thermal performance in a smaller footprint and faster clamping response - making it optimal for space-constrained, high-reliability automotive and industrial systems demanding full IEC61000-4-2 and ISO 7637-2 compliance.
Availability
SMF4L43CA-7 is available at Aetrix Electronics and suitable for automotive battery management, industrial CAN networks, USB Type-C power delivery ports, and smart meter voltage sensing requiring stable component supply across production lifecycles.
Supply support for SMF4L43CA-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers and manufacturing facilities across Asia and the Americas.
This device belongs to Diodes' SMF4L series of high-power, low-profile TVS diodes engineered specifically for AEC-Q200-compliant automotive subsystems and industrial equipment requiring robust, RoHS-compliant transient suppression.
FAQ
What is the maximum clamping voltage of SMF4L43CA-7 at its rated peak pulse current?
The maximum clamping voltage (VC) is 69.4V at 5.7A peak pulse current (IPP), measured under the standardized 10/1000µs double-exponential waveform. This value is guaranteed across the full operating temperature range (−55°C to +175°C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMF4L43CA-7 suitable for automotive applications requiring AEC-Q200 qualification?
Yes - SMF4L43CA-7 is manufactured in IATF 16949-certified facilities and qualified to AEC-Q200 for passive components. Its −55°C to +175°C operating range, 400W surge rating, and halogen-free "Green" construction meet requirements for under-hood and body-control module deployments.
How does the DO-219AA package improve thermal performance compared to SMA?
DO-219AA achieves RθJS = 70°C/W (junction-to-solder-point) versus ~120°C/W for SMA, due to shorter thermal path and larger copper pad coupling area. This allows sustained 400W pulse handling with lower junction temperature rise - critical for reliability in high-ambient automotive environments.
Can SMF4L43CA-7 be used in place of unidirectional TVS diodes like SMF4L43A-7?
No - SMF4L43CA-7 is bi-directional (no cathode band), while SMF4L43A-7 is unidirectional (cathode band marked). Substitution requires verifying circuit polarity; using the bi-directional part in a unidirectional application adds unnecessary leakage path but maintains clamping function, whereas reverse substitution fails on reverse-polarity surges.
SMF4L43CA-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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
SMF4L43CA-7 FAQ
1.How can I place an order for SMF4L43CA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF4L43CA-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 SMF4L43CA-7 reliable?
The price and inventory of SMF4L43CA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF4L43CA-7 is usually 5 days.
3.What payment methods are accepted for SMF4L43CA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF4L43CA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF4L43CA-7?
SMF4L43CA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF4L43CA-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 SMF4L43CA-7?
For technical support, including SMF4L43CA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF4L43CA-7 requirements.
6.How does Aetrix verify that SMF4L43CA-7 is sourced from the original manufacturer or authorized distributors?
All SMF4L43CA-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 SMF4L43CA-7 meets industry standards.
7.What is the process for return or replacement of SMF4L43CA-7?
All SMF4L43CA-7 units undergo pre-shipment inspection (PSI). If there is an issue with SMF4L43CA-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 SMF4L43CA-7 part is unused and in its original packaging.
Return procedure for SMF4L43CA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF4L43CA-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…
