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Taiwan Semiconductor Corporation SMAJ43A
- Part No.:
- SMAJ43A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43A.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,724
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Product details
Overview
SMAJ43A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 43 V working stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR), and clamps to ≤69.4 V at 5.8 A peak impulse current (IPPM) under 10/1000 µs waveform - ideal for protecting 48 V industrial power supplies and automotive ECUs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ43A datasheet, SMAJ43A pinout, SMAJ43A application, or SMAJ43A equivalent, key selection criteria include its 400 W peak pulse power rating (at ≤78 V), <1.0 ps response time, <1 µA reverse leakage above 10 V, DO-214AC mechanical compatibility, and RoHS/halogen-free compliance for high-reliability embedded systems.
Technical Context
The SMAJ43A operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast clamping (<1.0 ps rise-to-breakdown) and stable thermal performance up to TJ = 150 °C. Its single-die configuration and matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
Designed for non-repetitive surge suppression, it delivers 400 W peak pulse power at 25 °C using the standardized 10/1000 µs waveform, derating linearly above ambient temperature per Fig.2. It complies with ISO 7637-2 for automotive load-dump and inductive-switching immunity testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; sets system rail margin for 48 V nominal supplies. |
| VBR @ IT = 1 mA | 47.8–52.8 V - Breakdown voltage range defining reliable avalanche initiation threshold under standard test conditions. |
| VC @ IPPM = 5.8 A | ≤69.4 V - Clamping voltage during 10/1000 µs surge; ensures downstream ICs see <70 V stress during worst-case transients. |
| PPPM | 400 W - Peak pulse power handling at 25 °C; supports high-energy surges common in automotive and industrial environments. |
| IR @ VWM | ≤1 µA - Ultra-low reverse leakage at rated stand-off voltage; minimizes standby power loss in battery-backed systems. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass, UL 94V-0 molding, and polarity band marking. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; matte tin-plated leads; polarity indicated by band (cathode); weight ≈ 0.060 g; meets J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-potential node; completes conduction path during reverse-biased transient clamping. |
| Cathode (banded end) | High-side connection point | Connected to protected line (e.g., 48 V rail); blocks normal operation but avalanches into conduction when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress. |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream circuitry experiences damaging overvoltage - critical for microcontroller I/O and sensor interfaces. |
| ISO 7637-2 compliance | Validated for automotive-grade immunity to load dump (Pulse 2b), inductive switching (Pulse 1/3a/3b), and supply interruption (Pulse 2a). |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives - suitable for green manufacturing and export-compliant designs. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 48 V input rails in programmable logic controller (PLC) power stages against lightning-induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp ESD and inductive kickback. Use Value: Limits transient voltage to ≤69.4 V at 5.8 A, preventing damage to upstream DC/DC controllers and downstream FPGA power domains. | Use Scenario: Safeguarding LIN bus interface and power inputs in BCM modules exposed to ISO 7637-2 Pulse 1 (inductive load disconnect) and Pulse 2b (load dump). IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V/48 V auxiliary rails to absorb energy without triggering system reset or latch-up. Use Value: Delivers 400 W peak pulse power with <1 µA leakage, ensuring low quiescent current and reliable clamping across -40 °C to +125 °C ambient. |
| LED Driver Overvoltage Clamp | Telecom DC/DC Converter Input |
Use Scenario: Suppressing voltage spikes on constant-current LED driver inputs caused by hot-plug events or cable inductance in streetlight systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input capacitor node, placed ahead of buck controller ICs. Use Value: Clamps 10/1000 µs surges to ≤69.4 V while maintaining 43 V operating margin - avoids false triggering during normal 48 V rail ripple. | Use Scenario: Protecting isolated DC/DC converter primary-side inputs in PoE-powered telecom equipment subjected to Ethernet cable ESD and field surges. IC Role / Device Role / Timing Role: Front-end TVS on 48 V input stage to shunt transients before they reach transformer primary winding and control IC. Use Value: With DO-214AC footprint and J-STD-002 solderability, enables automated placement and reflow compatibility in high-volume telecom board assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43 | Higher clamping voltage (76.7 V @ 5.2 A) and wider VBR range (47.8–58.4 V); same DO-214AC package. | Less stringent clamping performance; suitable where higher VC is acceptable for cost-sensitive designs. | Select SMAJ43A when tighter clamping (≤69.4 V) and lower leakage (<1 µA) are required for sensitive 48 V systems. |
| SMBJ43A | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating at 25 °C. | Higher power handling and thermal mass; used where board space allows and surge energy exceeds 400 W. | Choose SMBJ43A only if layout permits larger footprint and higher surge margin is needed; SMAJ43A remains optimal for space-constrained 48 V rails. |
Compared with SMAJ43 and SMBJ43A, the SMAJ43A offers the best balance of tight clamping (69.4 V), low leakage (<1 µA), and compact DO-214AC packaging - making it preferred for high-density industrial and automotive PCBs where 48 V rail protection must coexist with strict voltage margins and automated assembly requirements.
Availability
SMAJ43A is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, LED driver overvoltage clamp, and telecom DC/DC converter input applications requiring stable component supply and full compliance with ISO 7637-2 and RoHS standards.
Supply support for SMAJ43A 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 TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMAJ series is part of TSC's transient suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and telecom infrastructure applications demanding ISO 7637-2 compliance and extended temperature operation.
FAQ
What is the clamping voltage of SMAJ43A and how is it measured?
The SMAJ43A has a maximum clamping voltage (VC) of 69.4 V, measured at a peak impulse current (IPPM) of 5.8 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per the manufacturer's electrical specifications table and reflects worst-case voltage seen by protected circuitry during transient events - critical for validating safe operating margins in 48 V systems.
Is SMAJ43A unidirectional or bidirectional, and how is polarity identified?
SMAJ43A is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Polarity is marked by a cathode band on the DO-214AC package - the banded end connects to the protected line (e.g., 48 V rail), while the anode connects to ground. Bidirectional variants use "CA" suffix (e.g., SMAJ43CA), which SMAJ43A does not carry.
Does SMAJ43A meet automotive transient immunity standards?
Yes, SMAJ43A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (battery feed interruption), Pulse 2b (load dump), and Pulses 3a/3b (capacitive coupling and supply line noise). Its 400 W peak pulse power rating and fast <1.0 ps response ensure robust immunity in automotive body electronics and ECU power inputs.
What is the maximum operating junction temperature for SMAJ43A?
The SMAJ43A has a maximum operating junction temperature (TJMAX) of +150 °C, with a specified operating junction temperature range of -55 °C to +150 °C. This allows reliable deployment in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 100 °C, provided PCB thermal design maintains junction temperature within limit.
How does SMAJ43A differ from SMAJ43 in practical circuit design?
SMAJ43A provides tighter parameter control than SMAJ43: its breakdown voltage range is narrower (47.8–52.8 V vs. 47.8–58.4 V), clamping voltage is lower (69.4 V vs. 76.7 V), and leakage current remains ≤1 µA (vs. ≤5 µA for SMAJ43 at same VWM). In practice, SMAJ43A enables more precise voltage margining in 48 V systems and reduces risk of false triggering during rail ripple.
SMAJ43A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ43A FAQ
1.How can I place an order for SMAJ43A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43A 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 SMAJ43A reliable?
The price and inventory of SMAJ43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43A is usually 5 days.
3.What payment methods are accepted for SMAJ43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43A?
SMAJ43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43A 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 SMAJ43A?
For technical support, including SMAJ43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43A requirements.
6.How does Aetrix verify that SMAJ43A is sourced from the original manufacturer or authorized distributors?
All SMAJ43A 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 SMAJ43A meets industry standards.
7.What is the process for return or replacement of SMAJ43A?
All SMAJ43A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43A, 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 SMAJ43A part is unused and in its original packaging.
Return procedure for SMAJ43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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