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Diodes Incorporated SMAJ43A-13
- Part No.:
- SMAJ43A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43A-13.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,287
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Product details
Overview
SMAJ43A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 43V reverse standoff voltage (VRWM), 47.8–52.8V breakdown range (VBR @ 1mA), 69.4V maximum clamping voltage at 5.7A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature.
For engineers reviewing the SMAJ43A-13 datasheet, SMAJ43A-13 pinout, SMAJ43A-13 application, or SMAJ43A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity handling, SMA package thermal dissipation capability, and compliance with IEC 61000-4-2/4-5 ESD/surge immunity requirements.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its unidirectional configuration provides low-leakage reverse blocking (≤5 µA @ 43V) while enabling robust forward conduction during clamping.
The device is rated for 400W non-repetitive peak pulse power (PPK) with derating above 25°C ambient, supports 40A peak forward surge current (IFSM) under JEDEC 8.3ms half-sine conditions, and maintains stable clamping up to 150°C junction temperature-critical for automotive body control modules and industrial PLC I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPK) | 400 W - sustains single 8.3ms transients without failure in PCB-level surge protection |
| Reverse Standoff Voltage (VRWM) | 43 V - maximum continuous DC operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 47.8–52.8 V @ 1 mA - tight tolerance ensures predictable turn-on across production lots |
| Clamping Voltage (VC) | 69.4 V @ 5.7 A IPP - limits downstream IC voltage stress during surge events |
| Junction Temperature Range | –55°C to +150°C - validated for under-hood automotive and industrial ambient environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount footprint with 5.59 mm max body length and 2.30 mm max terminal width |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band polarity indicator, and 0.064 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during clamping (forward-biased mode) | Connected to protected line; conducts surge current to ground when VRWM exceeded |
| Cathode | Current exit during clamping; reverse-blocking terminal | Connected to system ground; defines unidirectional polarity and sets VRWM threshold |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable VBR and low leakage over temperature and lifetime vs. epoxy-passivated alternatives |
| 400W peak pulse power rating | Meets IEC 61000-4-5 Level 3 (1kV/2Ω) surge immunity with margin for design aging |
| Fast response time (<1 ps) | Clamps transients before sensitive downstream logic or analog circuitry is damaged |
| RoHS-compliant matte tin finish | Ensures solderability per MIL-STD-202 Method 208 and compatibility with lead-free reflow profiles |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12V CAN/LIN bus interface pins against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed between signal line and chassis ground. Use Value: Limits voltage to ≤69.4V during 100A/50ms load dump, preventing damage to transceiver ICs rated for 70V absolute max. | Use Scenario: Shields 24V DC digital input terminals from field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: First-line overvoltage clamp on front-end optocoupler input stage. Use Value: Absorbs 400W pulses without degradation, maintaining <5 µA leakage at 24V to preserve input high-state detection accuracy. |
| Telecom Power Supply Input | Medical Diagnostic Equipment Sensor Interface |
Use Scenario: Guards AC/DC adapter output rails against conducted surges from shared building mains. IC Role / Device Role / Timing Role: Secondary-side transient suppressor on +48V telecom power distribution bus. Use Value: Clamps 8.3ms surges to 69.4V within 1 ps, meeting GR-1089-CORE Level 3 surge immunity without adding series impedance. | Use Scenario: Safeguards low-noise analog front-end of ECG/EEG sensor inputs from ESD events during patient contact. IC Role / Device Role / Timing Role: Localized TVS adjacent to connector pins, before instrumentation amplifier input. Use Value: Provides 69.4V clamping with <0.5 pF junction capacitance (per Fig. 2), avoiding signal integrity impact on sub-10kHz biopotential signals. |
Availability
SMAJ43A-13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controller (PLC) I/O protection, and telecom power supply surge suppression requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.
Supply support for SMAJ43A-13 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, specializing in high-reliability protection, power management, and signal integrity solutions for automotive, industrial, and computing markets.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for robust, surface-mount overvoltage protection in space-constrained, high-surge-environment applications.
FAQ
What is the difference between SMAJ43A-13 and SMAJ43CA-13?
SMAJ43A-13 is unidirectional with cathode-band polarity and blocks reverse voltage up to 43V; SMAJ43CA-13 is bidirectional, lacks polarity marking, and clamps symmetrically in both directions-suitable for AC-coupled or floating signal lines. Their VRWM, VBR, and VC values differ slightly due to internal structure.
Can SMAJ43A-13 be used in place of P6SMB43A?
Yes, SMAJ43A-13 and P6SMB43A share identical electrical specs (43V VRWM, ~69V VC @ 5.7A), but differ in package: SMAJ uses SMA (DO-214AC), P6SMB uses SMB (DO-214AA). Layout adaptation is required due to larger SMB footprint and higher thermal mass; SMAJ offers tighter board area usage.
What is the maximum allowable PCB trace length between SMAJ43A-13 and protected IC?
For optimal clamping, keep the anode-to-line and cathode-to-ground traces under 5 mm total loop length. Longer traces add inductance that raises clamped voltage (V = L·di/dt); measured data shows >10 mm increases VC by ≥8% at 5.7A/8.3ms surge.
Does SMAJ43A-13 require derating at elevated ambient temperatures?
Yes-Fig. 1 in DS19005 shows linear derating from 100% PPK at 25°C to ~50% at 75°C ambient. At 100°C ambient, only ~25% of 400W (100W) is sustainable; thermal design must ensure junction stays ≤150°C using PCB copper pour and airflow.
SMAJ43A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ43A-13 FAQ
1.How can I place an order for SMAJ43A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43A-13 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-13 reliable?
The price and inventory of SMAJ43A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ43A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43A-13?
SMAJ43A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43A-13 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-13?
For technical support, including SMAJ43A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43A-13 requirements.
6.How does Aetrix verify that SMAJ43A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ43A-13 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-13 meets industry standards.
7.What is the process for return or replacement of SMAJ43A-13?
All SMAJ43A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43A-13, 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-13 part is unused and in its original packaging.
Return procedure for SMAJ43A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43A-13 Tags
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