My Inquiry
My Account
Taiwan Semiconductor Corporation SMDJ43CAH
- Part No.:
- SMDJ43CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ43CAH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,583
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ43CAH from Taiwan Semiconductor is a bidirectional 43 V stand-off, 69.4 V clamping, 3000 W peak pulse power Transient Voltage Suppressor in DO-214AB (SMC) package, designed for automotive-grade ESD and surge protection in DC power rails and signal lines of industrial control systems.
For engineers reviewing the SMDJ43CAH datasheet, SMDJ43CAH pinout, SMDJ43CAH application, or SMDJ43CAH equivalent, key selection criteria include bidirectional clamping performance at 43 V working voltage, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, and thermal resistance (RθJA = 75 °C/W) for high-reliability board-level transient suppression.
Technical Context
The SMDJ43CAH uses a glass-passivated silicon junction to achieve sub-1 ps response time and symmetric clamping in both polarities, enabling robust protection against fast transients such as load dump and inductive switching spikes. Its bidirectional configuration eliminates polarity dependency during PCB layout and supports unidirectional or bidirectional signal/power line protection without external diode pairing.
Rated for 175 °C maximum junction temperature and moisture sensitivity level 1 (per J-STD-020), the device sustains repeated 3000 W 10/1000 µs waveform surges while maintaining <1 µA reverse leakage at 43 V and clamping ≤69.4 V at 43.2 A peak impulse current - critical for safeguarding CAN, LIN, and sensor interfaces in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin for 48 V systems. |
| VBR @ IT=1 mA | 47.8–52.8 V - Breakdown voltage range confirming reliable turn-on threshold under standardized test conditions. |
| VC @ IPPM | 69.4 V - Clamping voltage at 43.2 A peak current; limits downstream IC stress during ISO 7637-2 Pulse 5a events. |
| PPK | 3000 W - Peak pulse power rating for 1 ms duration; supports high-energy transient immunity per automotive standards. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; enables thermal design with minimal heatsinking on standard FR-4 PCBs. |
| TJ max | 175 °C - Maximum junction temperature; ensures operation in under-hood and industrial ambient conditions. |
| AEC-Q101 | Qualified - Validated for automotive electronic modules requiring reliability across temperature cycling, humidity, and mechanical shock. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no polarity marking required - simplifies layout and eliminates orientation errors. |
| Case (cathode band absent) | Thermal and mechanical interface | DO-214AB body provides low-inductance path and 0.29 g mass optimized for thermal dissipation and mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN FD) without polarity constraints. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load disconnect), Pulse 2a/2b (load dump simulation), and Pulse 3a/3b (switching noise) - meets OEM automotive requirements. |
| Sub-1 ps response time | Clamps transients before sensitive logic or analog circuitry responds - essential for protecting high-speed microcontrollers and ADC inputs. |
| AEC-Q101 qualification | Includes stress testing across temperature, humidity, and mechanical vibration - confirms suitability for automotive ECUs and ADAS modules. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life recycling mandates. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs and LIN bus lines from load dump and alternator ripple in BCMs. IC Role / Device Role / Timing Role: Primary transient suppressor placed at connector entry point to clamp ISO 7637-2 Pulse 5a up to 3000 W. Use Value: Limits voltage seen by MCU and transceivers to ≤69.4 V, preventing latch-up and permanent damage during engine cranking or battery disconnection. | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Bidirectional TVS shunting induced transients on dry-contact inputs before signal conditioning circuitry. Use Value: Maintains <1 µA leakage at 43 V stand-off, ensuring clean logic thresholds while clamping 43.2 A surges within 10/1000 µs waveform envelope. |
| Telecom Power Supply Input | Medical Diagnostic Sensor Interface |
Use Scenario: Front-end protection of 48 V telecom rectifier outputs against lightning-induced surges on outdoor cabinet feeds. IC Role / Device Role / Timing Role: Secondary-stage TVS after MOV-based primary protection, handling residual fast-rising transients. Use Value: Delivers 3000 W peak power handling with 75 °C/W thermal resistance - enables compact layout without forced air cooling. | Use Scenario: Shielding low-noise analog front-ends (e.g., ECG, EEG amplifiers) from ESD events during patient cable connection/disconnection. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical), bidirectional clamp on differential sensor lines referenced to isolated ground. Use Value: Sub-1 ps response prevents ESD-induced offset shift or saturation in precision instrumentation op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC43CA | Same 43 V VWM, but lower PPK = 1500 W; RθJA = 90 °C/W; non-AEC-Q101. | Limited to commercial-grade power supplies and consumer electronics - not qualified for automotive or industrial harsh environments. | Select when cost sensitivity outweighs automotive qualification and 3000 W surge headroom is unnecessary. |
| SMCJ43CA | Identical electrical specs and DO-214AB package; same AEC-Q101 qualification; minor marking and traceability differences per manufacturer lot control. | No functional or layout impact; direct drop-in replacement with identical thermal and clamping behavior. | Choose for multi-source procurement strategy where second-source validation is required without redesign. |
Compared with SAC43CA, SMDJ43CAH delivers double peak power rating and automotive qualification - critical for safety-critical systems; versus SMCJ43CA, it offers identical performance but distinct Taiwan Semiconductor traceability and supply chain continuity for OEM programs.
Availability
SMDJ43CAH is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and telecom power supply inputs requiring stable component supply across extended production lifecycles.
Supply support for SMDJ43CAH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global distribution and AEC-Q101 validation capability.
The SMDJ series was developed specifically for high-energy transient suppression in automotive and industrial applications - emphasizing rugged packaging, ISO 7637-2 compliance, and thermal robustness in surface-mount form factors.
FAQ
What is the clamping voltage of the SMDJ43CAH under maximum rated surge current?
The SMDJ43CAH clamps to a maximum of 69.4 V at its rated peak pulse current of 43.2 A (10/1000 µs waveform). This value is guaranteed across temperature and process variation per the official Taiwan Semiconductor datasheet revision B2104 and is measured with standardized test conditions (IPPM applied, VC recorded at peak). The SMDJ43CAH maintains this clamping performance consistently due to its glass-passivated junction and symmetric bidirectional structure.
Is the SMDJ43CAH suitable for use in automotive applications?
Yes, the SMDJ43CAH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards - making it suitable for automotive body electronics, infotainment power rails, and sensor interfaces. Its 175 °C maximum junction temperature and moisture sensitivity level 1 rating further validate its readiness for under-hood and module-level deployment. The SMDJ43CAH is designed for these environments and carries full TSC automotive qualification documentation.
How does the bidirectional configuration of the SMDJ43CAH affect PCB layout?
The SMDJ43CAH has symmetrical terminals with no cathode band or polarity marking, allowing placement in either orientation on the PCB - eliminating orientation errors and simplifying automated assembly. This bidirectional behavior means it protects against transients of either polarity without requiring external components or routing constraints. Unlike unidirectional TVS diodes, the SMDJ43CAH requires no attention to anode/cathode alignment, reducing design review time and improving yield in high-volume SMT lines.
What is the maximum steady-state power dissipation for the SMDJ43CAH at room temperature?
The SMDJ43CAH has a steady-state power dissipation (PD) rating of 6.5 W at TA = 25 °C, as specified in the Absolute Maximum Ratings table. This value reflects continuous DC or low-frequency power handling capability - distinct from its 3000 W peak pulse rating. Thermal design must account for derating above 25 °C using the published RθJA = 75 °C/W curve; at 70 °C ambient, usable PD drops to approximately 3.3 W. The SMDJ43CAH's thermal performance is validated in DO-214AB footprint per JEDEC standards.
Does the SMDJ43CAH require additional external components for basic transient protection?
No, the SMDJ43CAH operates as a standalone transient voltage suppressor and requires no series resistors, capacitors, or auxiliary diodes for fundamental clamping functionality. It is connected directly across the protected line and ground (or between differential lines). Layout best practices - such as minimizing trace inductance and using solid ground planes - are sufficient. The SMDJ43CAH's sub-1 ps response time and low dynamic impedance ensure effective suppression without supporting circuitry, unlike slower technologies like varistors or polymer-based TVS.
SMDJ43CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 43.2A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ43CAH FAQ
1.How can I place an order for SMDJ43CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ43CAH 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 SMDJ43CAH reliable?
The price and inventory of SMDJ43CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ43CAH is usually 5 days.
3.What payment methods are accepted for SMDJ43CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ43CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ43CAH?
SMDJ43CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ43CAH 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 SMDJ43CAH?
For technical support, including SMDJ43CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ43CAH requirements.
6.How does Aetrix verify that SMDJ43CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ43CAH 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 SMDJ43CAH meets industry standards.
7.What is the process for return or replacement of SMDJ43CAH?
All SMDJ43CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ43CAH, 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 SMDJ43CAH part is unused and in its original packaging.
Return procedure for SMDJ43CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ43CAH 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
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…
