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Taiwan Semiconductor Corporation SMAJ43CH
- Part No.:
- SMAJ43CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CH.pdf
- Description:
- TVS DIODE 43VWM 76.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
SMAJ43CH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 43V working stand-off voltage (VWM), 47.8–58.4V breakdown voltage (VBR), and 76.7V maximum clamping voltage (VC) at 5.2A peak impulse current - designed for automotive-grade overvoltage protection in DC/DC converters and SMPS inputs.
For engineers reviewing the SMAJ43CH datasheet, SMAJ43CH pinout, SMAJ43CH application, or SMAJ43CH equivalent, this device delivers AEC-Q101 qualification, sub-1ps response time, <1μA leakage above 10V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and robust 150°C junction operation - critical for reliable front-end surge suppression in harsh automotive and industrial power rails.
Technical Context
The SMAJ43CH employs a glass-passivated silicon junction optimized for fast transient response and stable clamping under repetitive 10/1000μs surge waveforms. Its unidirectional configuration provides asymmetric protection with cathode-anode polarity marking and forward voltage ≤3.5V at 25A.
It operates across -55°C to +150°C junction temperature range, supports 40A non-repetitive forward surge (8.3ms half-sine), and maintains <1μA reverse leakage at VWM = 43V - enabling low-power standby integrity in always-on vehicle subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets system operating margin before clamping activation. |
| VBR @ IT = 1 mA | 47.8–58.4 V - Breakdown threshold range defining onset of avalanche conduction; ensures predictable turn-on during transients. |
| VC @ IPPM = 5.2 A | 76.7 V - Clamped voltage during 10/1000μs surge; limits downstream IC stress to safe levels below rated input tolerances. |
| PPPM | 400 W - Peak pulse power handling per 10/1000μs waveform; supports high-energy load dump and inductive switching events. |
| IR @ VWM | <1 μA - Ultra-low reverse leakage at rated stand-off voltage; preserves efficiency and minimizes quiescent current in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature rating; enables placement near hot components (e.g., MOSFETs, inductors) without derating concerns. |
Pinout & Package
DO-214AC (SMA) surface-mount package with matte tin-plated leads, polarity indicated by cathode band, moisture sensitivity level 1 (J-STD-020), and UL 94V-0 compliant molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input return path for transient current | Connected to ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected to the rail being protected (e.g., 48V supply); voltage referenced to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, body modules, and ADAS power supplies. |
| Clamping response time <1 ps | Enables protection of high-speed digital interfaces and microcontrollers against ESD and fast-rising transients. |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Meets OEM-level automotive electrical disturbance immunity requirements for 12V/24V systems. |
| Glass passivated junction | Ensures long-term reliability and stable VBR performance under thermal cycling and humidity exposure. |
| DO-214AC (SMA) footprint | Standardized 2-pin SMD outline compatible with automated pick-and-place and reflow processes. |
Applications
| Automotive Body Control Module (BCM) | Industrial 48V DC/DC Converter Input |
|---|---|
Use Scenario: Protecting LIN bus interface and power input stages from load dump and jump-start surges in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V rail and ground to clamp transients before they reach MCU power pins and LIN transceivers. Use Value: Limits clamped voltage to 76.7V during 5.2A surge, keeping downstream 3.3V/5V regulators within safe input range while maintaining <1μA leakage during sleep mode. |
Use Scenario: Safeguarding primary-side MOSFET gates and controller ICs in isolated 48V-to-12V flyback converters used in factory automation equipment. IC Role / Device Role / Timing Role: Front-end rail protector on the 48V input, absorbing repetitive 10/1000μs pulses from relay switching and motor commutation noise. Use Value: Delivers 400W peak pulse power handling and 150°C operation, enabling compact layout without thermal derating in enclosed enclosures. |
| LED Headlamp Driver Power Stage | Telecom Remote Radio Unit (RRU) Power Input |
Use Scenario: Suppressing inductive kickback from high-current LED string drivers subjected to PWM dimming and thermal cycling. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor to absorb fast transients generated by MOSFET switching edges and EMI filter resonance. Use Value: Sub-1ps response ensures clamping initiates before gate oxide damage thresholds are exceeded in driver FETs; glass passivation prevents parameter drift over 10k+ thermal cycles. |
Use Scenario: Protecting outdoor-rated 48V PoE-powered RRUs from lightning-induced surges entering via copper power feeds. IC Role / Device Role / Timing Role: First-line unidirectional suppressor on DC input before DC-DC stage, coordinated with upstream gas discharge tube (GDT) for staged protection. Use Value: 76.7V clamping voltage allows sufficient margin below 100V-rated input capacitors and enables coordination with secondary TVS arrays for multi-stage surge management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ43A | Lower VBR range (47.8–52.8V), 69.4V clamping at 5.8A; same DO-214AC package and AEC-Q101 rating. | Better suited for tighter clamping tolerance requirements where lower VC is prioritized over higher surge current headroom. | Select SMAJ43A when system-level testing confirms 69.4V clamping meets downstream component VIN max, especially in space-constrained designs. |
| ON Semiconductor SMAJ43AHE3/A/H | Identical electrical specs and AEC-Q101 qualification; differs only in tape-and-reel packaging and RoHS/halogen-free compliance documentation. | No functional difference; suitable for legacy BOM migration where distributor stock or procurement terms favor ON Semi sourcing. | Choose SMAJ43AHE3/A/H for dual-sourcing flexibility without design change - same pinout, same thermal profile, same test reports. |
Compared with SMAJ43CH, SMAJ43A offers lower clamping voltage but reduced peak current margin, while SMAJ43AHE3/A/H provides identical performance with alternate logistics and compliance traceability - enabling risk-mitigated second-source strategy without layout or thermal redesign.
Availability
SMAJ43CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converter inputs, LED driver protection, and telecom remote radio unit power stages requiring stable component supply and AEC-Q101-compliant surge immunity.
Supply support for SMAJ43CH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability protection devices, rectifiers, and power management components.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust thermal performance in compact DO-214AC packages.
FAQ
What is the polarity configuration of the SMAJ43CH?
The SMAJ43CH is a unidirectional TVS diode with cathode-anode polarity. The cathode is marked by a band on the DO-214AC package and must be connected to the protected line (e.g., 43V rail), while the anode connects to ground. This configuration ensures low-leakage blocking in normal operation and controlled avalanche conduction during positive transients on the cathode side.
Does the SMAJ43CH meet automotive qualification standards?
Yes, the SMAJ43CH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It is rated for operation from -55°C to +150°C and features glass passivation and JESD201 Class 2 whisker resistance - confirming suitability for under-hood and body-control module applications.
What is the clamping voltage of the SMAJ43CH under standard surge conditions?
The SMAJ43CH has a maximum clamping voltage (VC) of 76.7 V at 5.2 A peak impulse current (IPPM) using the 10/1000μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during a standardized surge event.
Can the SMAJ43CH be used in bidirectional configurations?
No - the SMAJ43CH is unidirectional only. For bidirectional protection, Taiwan Semiconductor specifies the SMAJ43AH variant (marked CT), which provides symmetrical clamping in both directions. Using SMAJ43CH in reverse-biased mode risks permanent damage due to lack of reverse avalanche capability.
What is the maximum steady-state power dissipation for the SMAJ43CH?
The SMAJ43CH has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient. This value applies only to continuous DC or low-frequency AC conditions - not transient events. For surge protection, the relevant rating is 400 W peak pulse power (10/1000μs), which is thermally non-cumulative and requires proper PCB copper area for heat spreading.
SMAJ43CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43CH FAQ
1.How can I place an order for SMAJ43CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CH 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 SMAJ43CH reliable?
The price and inventory of SMAJ43CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CH is usually 5 days.
3.What payment methods are accepted for SMAJ43CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CH?
SMAJ43CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CH 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 SMAJ43CH?
For technical support, including SMAJ43CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CH requirements.
6.How does Aetrix verify that SMAJ43CH is sourced from the original manufacturer or authorized distributors?
All SMAJ43CH 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 SMAJ43CH meets industry standards.
7.What is the process for return or replacement of SMAJ43CH?
All SMAJ43CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CH, 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 SMAJ43CH part is unused and in its original packaging.
Return procedure for SMAJ43CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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