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onsemi SA43AG
- Part No.:
- SA43AG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA43AG.pdf
- Description:
- TVS DIODE 43VWM 69.4VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
SA43AG from onsemi is a unidirectional MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 43 V working peak reverse voltage (VRWM), 500 W peak pulse power rating at 1.0 ms, 67.8 V maximum clamping voltage at 7.4 A peak pulse current, <1 µA reverse leakage at VRWM, and sub-1 ns response time. It is used in industrial power supplies and medical equipment input protection.
For engineers reviewing the SA43AG datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin versus system operating voltage, surge current capability under IEC 61000-4-5 waveforms, UL 497B certification for isolated loop protection, and axial leaded Surmetic package thermal performance in convection-cooled PCB layouts.
Technical Context
The SA43AG operates as a voltage-clamping device that remains non-conductive below its 43 V VRWM and enters avalanche breakdown above its 47.8–50.3 V VBR range to divert transient energy. Its low zener impedance and fast <1 ns response ensure minimal overvoltage exposure to downstream ICs during ESD or lightning-induced surges.
It is rated for 500 W non-repetitive peak pulse power per 1.0 ms waveform (Figure 4), with derating to 3.0 W steady-state power at TL ≤ 25°C and thermal resistance of 33.3°C/W junction-to-lead. The device meets Class 3 ESD immunity (>16 kV HBM) and UL 497B recognition for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system voltage margin. |
| VBR @ IT = 1 mA | 47.8–50.3 V - Breakdown threshold range; defines onset of avalanche conduction under standardized test current. |
| VC @ IPP = 7.4 A | 67.8 V - Maximum clamped voltage during 1.0 ms surge; determines worst-case overvoltage seen by protected circuitry. |
| PPK | 500 W - Peak transient power handling per single 1.0 ms pulse; validates compliance with IEC 61000-4-5 Level 4. |
| IR @ VRWM | <1 µA - Reverse leakage at rated working voltage; ensures negligible standby power loss and signal integrity in high-impedance nodes. |
| Response Time | <1 ns - Time from transient rise to clamping onset; critical for protecting high-speed interfaces and logic inputs. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for use in isolated loop protectors, not just flammability-rated packaging. |
Pinout & Package
SA43AG is housed in ON Semiconductor's Surmetic axial-leaded plastic package (Case 59AA), featuring a cathode band marking and Pb-free construction. Leads are solderable at 260°C for 10 seconds at 1/16 inch from case body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., +12 V rail); voltage referenced to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Validates robustness against IEC 61000-4-5 1.2/50 µs × 8/20 µs combined wave surges up to Level 4. |
| UL 497B recognition | Confirms qualification for safety-critical isolated loop protection in telecom and medical systems-not just package flammability. |
| Class 3 ESD immunity | Withstands >16 kV contact discharge per Human Body Model, eliminating need for supplemental ESD diodes in many front-end designs. |
| Low zener impedance | Enables tight clamping voltage control across production lots and temperature, reducing design margin uncertainty. |
| Sub-1 ns response time | Prevents voltage overshoot on fast-rising transients (e.g., relay bounce, inductive switch-off), protecting CMOS inputs and ADC references. |
Applications
| Industrial Power Supply Input Protection | Medical Equipment ESD Shielding |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and field wiring transients. IC Role / Device Role / Timing Role: Primary clamping element on main DC bus; absorbs multi-hundred-joule surges before they reach upstream rectifier and downstream DC/DC converter. Use Value: Limits transient overvoltage to ≤67.8 V, preserving 75 V-rated electrolytic capacitors and MOSFET gate oxide integrity without derating. |
Use Scenario: Front-panel USB and RS-232 ports on diagnostic imaging console subject to clinical ESD events. IC Role / Device Role / Timing Role: Board-level ESD shunt on shielded interface lines; activated within <1 ns to clamp HBM discharges before reaching PHY ICs. Use Value: Meets IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) without additional TVS arrays, reducing BOM count and layout area. |
| Process Control Sensor Interface | Business Machine AC/DC Adapter Protection |
Use Scenario: 4–20 mA current loop transmitter connected to factory floor cabling prone to induced lightning surges. IC Role / Device Role / Timing Role: Bidirectional protection (used with series resistor) on loop supply line; clamps common-mode transients between loop and chassis ground. Use Value: UL 497B certification validates safe operation in isolated loop topologies required by ISA/IEC 61000-6-2 industrial immunity standards. |
Use Scenario: Secondary-side output of wall-mounted AC/DC adapter powering point-of-sale terminals. IC Role / Device Role / Timing Role: Overvoltage limiter on regulated 5 V or 12 V output rail; prevents latch-up or burnout in downstream microcontrollers during output short-circuit recovery. Use Value: 67.8 V clamping voltage provides ≥10 V headroom above 5 V rail while maintaining <1 µA leakage to avoid regulation drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A | Same VRWM (43 V) and VC (67.8 V), but SMC package (surface-mount); lower PPK (400 W) and higher thermal resistance (50°C/W). | Requires rework for board assembly; better suited for space-constrained consumer designs than industrial through-hole layouts. | Select SMAJ43A only when automated SMT placement is mandatory and surge duty cycle is light (≤1 event/hour). |
| P6KE43A | Same axial package (DO-15), but older generation: higher IR (5 µA), slower response (~1.2 ns), no UL 497B recognition. | Lacks safety certification for medical/isolated loop use; requires external filtering to meet same ESD immunity levels. | Choose P6KE43A only for cost-sensitive, non-certified industrial controls where UL compliance is not mandated. |
Compared with SA43AG, SMAJ43A trades mechanical robustness and surge margin for PCB footprint reduction, while P6KE43A sacrifices certified reliability and leakage performance to meet legacy BOM cost targets-neither offers drop-in replacement without validation.
Availability
SA43AG is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment front-ends, process control sensor interfaces, and business machine AC/DC adapters requiring stable component supply and long-term lifecycle support.
Supply support for SA43AG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The SA5.0A Series-including SA43AG-is part of onsemi's MiniMOSORB TVS family, engineered specifically for high-reliability transient suppression in safety-critical industrial and medical systems requiring UL 497B certification and repeatable clamping performance.
FAQ
What is the clamping voltage of SA43AG at its rated peak pulse current?
The SA43AG has a maximum clamping voltage (VC) of 67.8 V at its rated peak pulse current (IPP) of 7.4 A, measured using the 1.0 ms exponential waveform defined in Figure 4 of the datasheet. This value represents the worst-case overvoltage imposed on protected circuitry during a full-power transient event and is critical for ensuring downstream components remain within absolute maximum ratings. The SA43AG maintains this clamping performance across its qualified temperature range of −55°C to +150°C.
Does SA43AG meet UL 497B requirements for isolated loop protection?
Yes, SA43AG is explicitly included in onsemi's UL 497B recognition (File #E210057, Category QVGQ2) for protector-class applications, covering the full SA5.0A–SA170A series. This certification validates successful completion of Strike Voltage Breakdown, Endurance Conditioning, Dielectric Withstand, and Discharge tests-not merely flammability compliance. The SA43AG is therefore approved for use in isolated loop circuits in medical and telecom infrastructure where regulatory approval is mandatory.
What is the reverse leakage current specification for SA43AG at its working voltage?
The SA43AG specifies a maximum reverse leakage current (IR) of <1 µA at its working peak reverse voltage (VRWM) of 43 V and ambient temperature of 25°C. This ultra-low leakage ensures minimal power loss in always-on systems and preserves signal integrity in high-impedance sensor bias networks. The value is verified per the test conditions in the Electrical Characteristics table and remains stable across the device's operational temperature range.
How does the thermal performance of SA43AG compare to surface-mount TVS diodes?
SA43AG features a junction-to-lead thermal resistance (RJL) of 33.3°C/W and is rated for 3.0 W steady-state power dissipation at TL ≤ 25°C, with linear derating above 50°C. Its axial Surmetic package (Case 59AA) provides superior heat transfer to PCB copper pours or heatsinks compared to SMC/SMA packages like SMAJ43A (RJL ≈ 50°C/W). This makes SA43AG more suitable for high-duty-cycle or high-ambient-temperature environments such as industrial enclosures without forced airflow.
Is SA43AG compatible with lead-free soldering processes?
Yes, SA43AG is supplied in a Pb-free Surmetic axial package (denoted by the "G" suffix) and is qualified for lead-free reflow and hand-soldering. The maximum lead temperature is specified at 260°C for 10 seconds at 1/16 inch from the case body. Its corrosion-resistant finish and readily solderable leads comply with J-STD-020 moisture sensitivity level (MSL) requirements, and no pre-baking is needed for standard handling and assembly.
SA43AG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- MiniMosorb™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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):
- 7.2A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
SA43AG FAQ
1.How can I place an order for SA43AG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA43AG 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 SA43AG reliable?
The price and inventory of SA43AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA43AG is usually 5 days.
3.What payment methods are accepted for SA43AG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA43AG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA43AG?
SA43AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA43AG 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 SA43AG?
For technical support, including SA43AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA43AG requirements.
6.How does Aetrix verify that SA43AG is sourced from the original manufacturer or authorized distributors?
All SA43AG 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 SA43AG meets industry standards.
7.What is the process for return or replacement of SA43AG?
All SA43AG units undergo pre-shipment inspection (PSI). If there is an issue with SA43AG, 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 SA43AG part is unused and in its original packaging.
Return procedure for SA43AG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA43AG Tags
-
ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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