My Inquiry
My Account
Alpha & Omega Semiconductor Inc. SMDJ43CA
- Part No.:
- SMDJ43CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ43CA.pdf
- Description:
- 1CH 43V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:7,149
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ43CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 43.0 V reverse stand-off voltage (VRWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 43.3 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial motor drives to protect IGBT gate drivers from inductive switching transients.
For engineers reviewing the SMDJ43CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, DO-214AB package thermal performance (RθJA = 75 °C/W), low leakage (<2 µA @ VRWM), and compliance with JEDEC MSL Level 1 reflow requirements up to 260 °C.
Technical Context
The SMDJ43CA operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to breakdown. Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating circuits without polarity constraints.
Thermal design relies on its DO-214AB package mounted on 8.0 mm × 8.0 mm copper pads, achieving RθJL = 15 °C/W and supporting 300 A non-repetitive forward surge (8.3 ms half-sine). The 0.01% duty cycle rating ensures robustness against infrequent but high-energy lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 43.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin in protected line. |
| VBR @ IT=1 mA | 47.8–52.8 V - Measured breakdown range confirming tight tolerance for predictable clamping onset. |
| VC @ IPPM | 69.4 V - Clamped voltage at 43.3 A peak pulse; determines maximum stress imposed on downstream ICs during surge. |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy handling capacity; supports EN 61000-4-5 Level 4 (4 kV/2 Ω) compliance with margin. |
| IR @ VRWM | <2 µA - Ultra-low leakage ensures minimal standby power loss and no signal distortion in high-impedance sensing paths. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive or enclosed industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance defining required PCB copper area (8 mm × 8 mm per terminal) for reliable power derating. |
Pinout & Package
DO-214AB (SMC J-Bend) surface-mount package with molded plastic case and matte tin lead-free plating. Cathode identification via color band applies only to unidirectional variants; SMDJ43CA is bi-directional and has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional surge conduction path | Both terminals function identically - symmetric clamping in either direction eliminates need for orientation during placement. |
| Case | Non-electrical mechanical interface | Plastic body provides strain relief and UL 94V-0 flammability rating; no thermal or electrical connection to die. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), or floating sensor inputs without external diode pairing. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| MSL Level 1 rating | Supports standard lead-free reflow profiles (peak 260 °C) without baking or special handling - reduces manufacturing cost and risk. |
| Low profile SMC package | Height ≤2.6 mm allows use in space-constrained modules such as DIN-rail PLC I/O cards or compact power supplies. |
| Strain relief construction | Prevents solder joint fracture under thermal cycling or mechanical vibration - critical for transportation and industrial control applications. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protecting gate driver ICs and isolated feedback paths from inductive kickback during IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Transient voltage suppressor providing sub-nanosecond clamping to limit voltage overshoot below 70 V. Use Value: Prevents gate oxide rupture in 600 V IGBT drivers by holding transient stress within safe SOA limits during 3000 W surge events. | Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs against load dump and jump-start transients in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional TVS absorbing ±100 V/500 ms load dump pulses while maintaining <2 µA leakage at 12 V nominal supply. Use Value: Eliminates need for separate positive/negative clamping diodes - reduces BOM count and PCB area by 50% vs. discrete solutions. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Clamping induced surges on -48 V DC telecom distribution lines exposed to nearby lightning strikes or switching noise. IC Role / Device Role / Timing Role: High-power TVS absorbing 10/1000 µs surges up to 3000 W while maintaining stable VRWM across -40 to +85 °C ambient. Use Value: Enables single-stage protection meeting GR-1089-CORE Level 3 requirements without cascaded MOV+TVS designs. | Use Scenario: Protecting MPPT controller inputs and isolation barrier drivers from grid-side surge coupling in solar string inverters. IC Role / Device Role / Timing Role: Bi-directional clamping device suppressing common-mode transients across DC-link capacitors and auxiliary power rails. Use Value: Withstands 300 A 8.3 ms surge (IFSM) without degradation - extends field reliability beyond 20-year PV system lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC43CA (Littelfuse) | Same DO-214AB package, identical VRWM (43 V) and PPPM (3000 W), but VBR min/max tighter (47.8–50.6 V vs. 47.8–52.8 V). | Preferred where tighter VBR tolerance is required for precise clamping threshold control in safety-critical systems. | Select SAC43CA when VBR consistency across production lots is prioritized over cost; SMDJ43CA offers broader VBR range for higher yield in high-volume manufacturing. |
| 1.5KE43CA (ON Semiconductor) | Through-hole DO-15 package (not SMD), same electrical specs, but RθJA ≈ 50 °C/W on FR-4 vs. 75 °C/W for SMDJ43CA on copper pads. | Suitable for legacy through-hole designs or prototyping; not compatible with automated SMT assembly. | Choose 1.5KE43CA only for manual assembly or repair scenarios; SMDJ43CA is mandatory for production-grade SMT lines requiring MSL Level 1 compliance. |
Compared with SAC43CA and 1.5KE43CA, the SMDJ43CA delivers optimal balance of SMT manufacturability, thermal performance on optimized PCB layouts, and cost-effective VBR tolerance - making it the preferred choice for new industrial and automotive PCB designs targeting high-volume production.
Availability
SMDJ43CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for SMDJ43CA 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in MOSFETs, IGBTs, and protection devices, with global manufacturing and test facilities.
The SMDJ series is engineered specifically for high-reliability transient suppression in harsh-environment power electronics, emphasizing robust surge handling, JEDEC-compliant SMT integration, and extended temperature operation.
FAQ
What is the clamping voltage of the SMDJ43CA under a 10/1000 µs surge?
The SMDJ43CA exhibits a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 43.3 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the SMDJ43CA suitable for bidirectional signal line protection?
Yes, the SMDJ43CA is explicitly designed as a bi-directional TVS diode, with identical electrical characteristics in both directions. Its symmetrical clamping behavior makes it ideal for protecting differential interfaces like RS-485, CAN FD, or Ethernet PHY lines where polarity cannot be assumed - unlike unidirectional variants such as SMDJ43A.
Does the SMDJ43CA require orientation during PCB placement?
No, the SMDJ43CA does not require specific orientation during placement because it is a bi-directional device with no anode/cathode distinction in functional operation. While the DO-214AB package has a physical cathode band marking, this marking is omitted or irrelevant for CA-suffix parts - confirmed by the datasheet's "DEVICES FOR BIPOLAR APPLICATION" section.
What is the maximum operating temperature for the SMDJ43CA?
The SMDJ43CA has a specified junction temperature range of -55 °C to +150 °C. Its thermal performance depends on PCB layout: when mounted on 8.0 mm × 8.0 mm copper pads per terminal, it achieves RθJA = 75 °C/W, allowing full 3000 W surge capability at TA = 25 °C and derated performance up to +125 °C ambient in properly designed systems.
How does the SMDJ43CA compare to older 1.5KE series TVS diodes?
The SMDJ43CA replaces through-hole 1.5KE43CA with identical electrical specs but in a surface-mount DO-214AB package. It offers superior manufacturability (MSL Level 1, lead-free compatible), lower profile, and better thermal performance on optimized PCBs - though its RθJA is higher than 1.5KE43CA's on FR-4 due to different mounting assumptions.
SMDJ43CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 43.3A
- Power - Peak Pulse:
- 3000W (3kW)
- 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:
- DO-214AB
SMDJ43CA FAQ
1.How can I place an order for SMDJ43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ43CA 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 SMDJ43CA reliable?
The price and inventory of SMDJ43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ43CA is usually 5 days.
3.What payment methods are accepted for SMDJ43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ43CA?
SMDJ43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ43CA 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 SMDJ43CA?
For technical support, including SMDJ43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ43CA requirements.
6.How does Aetrix verify that SMDJ43CA is sourced from the original manufacturer or authorized distributors?
All SMDJ43CA 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 SMDJ43CA meets industry standards.
7.What is the process for return or replacement of SMDJ43CA?
All SMDJ43CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ43CA, 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 SMDJ43CA part is unused and in its original packaging.
Return procedure for SMDJ43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ43CA 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 and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
