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Vishay General Semiconductor - Diodes Division SA43-E3/73
- Part No.:
- SA43-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA43-E3/73.pdf
- Description:
- TVS DIODE 43VWM 76.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,333
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Product details
Overview
SA43-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 7.2 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used in automotive body control modules, industrial PLC I/O protection, and telecom power supply inputs.
For engineers reviewing the SA43-E3/73 datasheet, SA43-E3/73 pinout, SA43-E3/73 application, or SA43-E3/73 equivalent, this device is evaluated for fast transient suppression in 12 V/24 V systems where low clamping ratio, AEC-Q101 qualification, and robust surge handling per IEC 61000-4-5 are required.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: it remains high-impedance below VWM = 43 V, then avalanches sharply at VBR = 47.8–52.8 V to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable breakdown behavior across temperature.
The device complies with AEC-Q101 stress testing for automotive use and supports 70 A non-repetitive forward surge (IFSM) - critical for surviving load-dump transients. Its 3.0 W steady-state power dissipation and -55 °C to +175 °C operating junction range enable deployment in under-hood and industrial environments without thermal derating penalties.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse working voltage before clamping begins; sets protection threshold for 48 V nominal systems. |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 69.4 V at 7.2 A - Clamping voltage during 10/1000 µs surge; limits downstream voltage stress to safe levels. |
| PPPM | 500 W - Peak pulse power handling capacity; meets Level 4 IEC 61000-4-5 surge immunity requirements. |
| IFSM | 70 A - Single half-sine surge current rating; withstands automotive load-dump events without failure. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in high-ambient engine bay or industrial enclosures. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with matte tin-plated leads, RoHS-compliant and JESD 201 Class 1A whisker tested. |
Pinout & Package
SA43-E3/73 uses a two-terminal DO-204AC (DO-15) axial package. The cathode is marked by a color band on the body; the anode is unmarked. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or low-impedance return; completes clamping path during transient. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, infotainment power supplies, and ADAS sensor interfaces. |
| 500 W peak pulse power (10/1000 µs) | Provides robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during clamping - critical for safeguarding 48 V-rated MOSFETs and microcontrollers. |
| RoHS-compliant, E3 suffix | Meets JESD 201 Class 1A whisker resistance and UL 94 V-0 flammability for safety-critical PCB assemblies. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and chassis ground. Use Value: Limits voltage excursion to ≤69.4 V during 70 A surge events, preventing damage to PMICs and CAN transceivers. |
Use Scenario: Safeguarding analog input channels of PLC analog I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary front-end clamp on 4–20 mA or 0–10 V sensor signal lines. Use Value: Responds in <1 ns to clamp transients before they reach precision op-amps or ADCs, preserving measurement integrity. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Secondary overvoltage protection on 48 V PoE-powered telecom equipment power inputs. IC Role / Device Role / Timing Role: Standoff-rated TVS in parallel with bulk capacitor to absorb residual surges after upstream MOV filtering. Use Value: Maintains 43 V operating margin while clamping to 69.4 V - compatible with 75 V-rated DC-DC controllers. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Flyback diode replacement for faster, lower-leakage transient suppression across H-bridge outputs. Use Value: Delivers 500 W pulse handling with <1 µA leakage at 43 V - extends battery life and prevents false MCU resets. |
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-E3/5T | Same VWM (43 V), but SMC (DO-214AB) surface-mount package; slightly higher VC (70.1 V at 7.1 A). | Requires PCB re-layout for SMD placement; better suited for high-density consumer electronics vs. through-hole industrial designs. | Select SMAJ43A-E3/5T when board space is constrained and automated assembly is preferred. |
| 1.5KE43A | Higher PPPM (1500 W), same DO-204AC package, but larger case size (DO-201AD); VC = 69.4 V at 21.7 A. | Overqualified for 500 W needs; introduces unnecessary cost and thermal mass in compact 12 V systems. | Choose 1.5KE43A only when legacy 1.5 kW surge compliance (e.g., MIL-STD-1275) is mandated. |
Compared with SMAJ43A-E3/5T and 1.5KE43A, SA43-E3/73 delivers optimal balance of proven through-hole reliability, AEC-Q101 qualification, and precise 500 W surge handling - making it the preferred choice for cost-sensitive, high-volume automotive and industrial power protection where DO-15 form factor and RoHS/E3 compliance are mandatory.
Availability
SA43-E3/73 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and telecom power supply hardening requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SA43-E3/73 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and application-specific performance.
The SAxx series was engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are non-negotiable.
FAQ
What is the maximum clamping voltage of SA43-E3/73 under standard test conditions?
The SA43-E3/73 has a maximum clamping voltage (VC) of 69.4 V at 7.2 A peak pulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and reflects the actual voltage seen by protected circuitry during a defined surge event - critical for ensuring downstream components remain within their absolute maximum ratings. The SA43-E3/73 maintains this clamping performance across its full operating temperature range.
Is SA43-E3/73 qualified for automotive applications?
Yes, SA43-E3/73 is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and humidity bias. Its DO-204AC package with E3 suffix also meets JESD 201 Class 1A whisker resistance and RoHS compliance - making SA43-E3/73 suitable for under-hood and cabin ECU designs per automotive OEM requirements.
What does the "E3/73" suffix indicate in SA43-E3/73?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 1A whisker resistance. The "/73" specifies packaging: 73 indicates 13-inch diameter paper tape and reel, with 4000 units per reel - standard for automated SMT placement despite SA43-E3/73 being a through-hole part. This packaging format ensures compatibility with pick-and-place feeders in mixed-technology assembly lines.
How does SA43-E3/73 compare to bi-directional TVS diodes like SA43CA?
SA43-E3/73 is unidirectional and includes a cathode band for polarity-sensitive placement, whereas SA43CA is bi-directional with no marking and symmetric clamping in both polarities. SA43-E3/73 offers lower leakage (<1.0 µA at 43 V) and tighter VBR tolerance than SA43CA, making it preferable for DC power rail protection. SA43CA would be selected only for AC-coupled or floating signal line protection where polarity reversal is possible.
Can SA43-E3/73 be used in parallel for higher surge current handling?
No - SA43-E3/73 is not characterized or recommended for parallel operation. Mismatches in VBR and dynamic impedance can cause current imbalance, leading to thermal runaway in one device. For higher surge capability, select a single higher-rated device such as SA70A or use a hybrid approach with upstream MOVs. The SA43-E3/73 datasheet does not specify matching or derating guidelines for paralleling.
SA43-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA43-E3/73 FAQ
1.How can I place an order for SA43-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA43-E3/73 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 SA43-E3/73 reliable?
The price and inventory of SA43-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA43-E3/73 is usually 5 days.
3.What payment methods are accepted for SA43-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA43-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA43-E3/73?
SA43-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA43-E3/73 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 SA43-E3/73?
For technical support, including SA43-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA43-E3/73 requirements.
6.How does Aetrix verify that SA43-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA43-E3/73 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 SA43-E3/73 meets industry standards.
7.What is the process for return or replacement of SA43-E3/73?
All SA43-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA43-E3/73, 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 SA43-E3/73 part is unused and in its original packaging.
Return procedure for SA43-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA43-E3/73 Tags
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