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Vishay General Semiconductor - Diodes Division SA40AHE3/54
- Part No.:
- SA40AHE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40AHE3/54.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,320
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Product details
Overview
SA40AHE3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for clamping voltage transients on power and signal lines. It features 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage at 7.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SA40AHE3/54 datasheet, SA40AHE3/54 pinout, SA40AHE3/54 application, or SA40AHE3/54 equivalent, this AEC-Q101-qualified TVS diode supports automotive-grade surge protection design, offers low incremental clamping resistance, fast response time, and stable performance across -55 °C to +175 °C junction temperature range.
Technical Context
The SA40AHE3/54 operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown voltage to shunt transient energy to ground. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at 40 V), while the DO-15 package provides mechanical robustness and solderability per J-STD-002.
It delivers 500 W peak pulse power handling under standardized 10/1000 μs waveform, with clamping voltage tightly controlled at 64.5 V (typ.) at 7.8 A IPPM - enabling reliable protection of downstream 3.3 V/5 V/12 V logic and power stages against ESD, load dump, and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Ensures predictable turn-on during transients without premature conduction during normal operation. |
| VC (Clamping Voltage) | 64.5 V at 7.8 A IPPM - Limits peak voltage seen by protected circuitry during worst-case 500 W surge event. |
| PPPM | 500 W (10/1000 μs) - Sustains high-energy surges common in automotive and industrial environments without failure. |
| ID (Leakage Current) | ≤1.0 μA at 40 V - Minimizes standby power loss and avoids false triggering in low-power sensor interfaces. |
| TJ Max | +175 °C - Supports under-hood automotive deployment and high-ambient industrial control applications. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD. |
Pinout & Package
Package: DO-15 (DO-204AC), axial-leaded, epoxy-molded case with matte tin-plated leads. Polarity marked by cathode band; lead length ≥25.4 mm, diameter 0.86 mm, body diameter 3.3–3.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward conduction terminal | Connected to protected line (e.g., 12 V rail or signal trace); conducts during forward surge (IFSM = 70 A). |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to ground reference; avalanches at VBR to clamp transients when reverse voltage exceeds 44.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures tight VBR tolerance (±5 % typical), low leakage, and long-term stability under thermal cycling. |
| 500 W peak pulse power (10/1000 μs) | Withstands automotive load-dump and ISO 7637-2 Pulse 5a surges without degradation. |
| AEC-Q101 qualification | Validated for automotive use including HTOL at 175 °C, temperature cycling, and mechanical shock testing. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected ICs - critical for safeguarding 3.3 V microcontrollers and CAN transceivers. |
| RoHS-compliant HE3 suffix | Meets JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability for safety-critical systems. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges up to 120 V. Use Value: SA40AHE3/54's 64.5 V clamping voltage ensures downstream DC/DC converters and microcontrollers remain within safe absolute maximum ratings. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable-induced noise in factory automation. IC Role / Device Role / Timing Role: TVS connected across differential signal pair (e.g., RS-485 bus lines) referenced to local ground. Use Value: Sub-1 μA leakage at 40 V prevents signal offset drift; fast <1 ns response captures ESD events before damage occurs. |
| Consumer USB Port Surge Protection | Telecom Power Supply Input Clamping |
Use Scenario: Safeguarding USB 2.0 data lines and VBUS against hot-plug transients and nearby lightning-induced coupling. IC Role / Device Role / Timing Role: Discrete unidirectional TVS on VBUS line, anode to VBUS, cathode to ground. Use Value: 500 W rating absorbs multiple IEC 61000-4-5 Level 3 surges; DO-15 footprint allows manual rework and cost-effective placement. | Use Scenario: Clamping AC/DC converter primary-side input against surges from mains transients or backfeed from rectifier stage. IC Role / Device Role / Timing Role: TVS placed across bulk capacitor input to suppress >1 kV spikes induced by switching transients. Use Value: 175 °C max junction temperature enables reliable operation near heat-generating transformers and MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/52 | Same VWM (40 V), lower PPPM (400 W), SMA package (surface-mount), no AEC-Q101 qualification. | Preferred for space-constrained PCBs where reflow assembly is required; unsuitable for automotive under-hood use. | Select SMAJ40A-E3/52 only if board area is limited and automotive qualification is not required. |
| 1.5KE40A | Same VWM (40 V), higher IFSM (100 A), DO-201 package (larger than DO-15), 1500 W PPPM but larger footprint. | Better suited for high-reliability industrial power supplies needing higher surge margin and thermal mass. | Choose 1.5KE40A when system-level surge testing exceeds 500 W or when legacy DO-201 layout exists. |
Compared with SMAJ40A-E3/52 and 1.5KE40A, the SA40AHE3/54 uniquely balances AEC-Q101 compliance, DO-15 through-hole manufacturability, and precise 500 W/64.5 V clamping performance - making it optimal for automotive module designs requiring audit-ready qualification and serviceable assembly.
Availability
SA40AHE3/54 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor nodes, and telecom power supply inputs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SA40AHE3/54 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, qualification, and application-specific performance.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered for robust transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom infrastructure where AEC-Q101 validation and repeatable clamping behavior are mandatory.
FAQ
What is the clamping voltage of the SA40AHE3/54 under a 10/1000 μs surge?
The SA40AHE3/54 has a maximum clamping voltage (VC) of 64.5 V at 7.8 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC standards and reflects the actual voltage imposed on protected circuitry during a 500 W transient event - critical for ensuring downstream components like microcontrollers or CAN transceivers remain within their absolute maximum ratings.
Is the SA40AHE3/54 suitable for automotive applications?
Yes, the SA40AHE3/54 is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature operating life, temperature cycling, and ESD immunity required for automotive electronics. Its DO-15 package, 175 °C max junction temperature, and stable clamping performance make it appropriate for engine control modules, body electronics, and ADAS sensor interfaces where reliability under thermal and electrical stress is essential.
How does the SA40AHE3/54 differ from bidirectional TVS diodes like SA40CA?
The SA40AHE3/54 is unidirectional and features a cathode band marking; it conducts only in reverse bias above VBR and blocks forward current up to 3.5 V at 100 A. In contrast, SA40CA is bidirectional with no polarity marking and symmetrical clamping in both directions - making SA40AHE3/54 ideal for DC power rail protection, while SA40CA suits AC or differential signal lines where polarity reversal may occur.
What is the leakage current specification for SA40AHE3/54 at rated stand-off voltage?
At its 40 V stand-off voltage (VWM), the SA40AHE3/54 exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes quiescent power loss in always-on automotive modules - a key advantage over higher-leakage alternatives that could cause measurement drift or battery drain.
Can SA40AHE3/54 be used in place of SMAJ40A in existing designs?
No - SA40AHE3/54 uses a DO-15 axial package, while SMAJ40A uses an SMA surface-mount package; they are not pin-compatible or drop-in replacements. Layout redesign is required to accommodate the through-hole leads and different thermal pad requirements. However, both share identical VWM (40 V) and similar clamping performance, so SA40AHE3/54 may be selected when AEC-Q101 qualification, manual assembly, or higher surge margin is needed.
SA40AHE3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA40AHE3/54 FAQ
1.How can I place an order for SA40AHE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40AHE3/54 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 SA40AHE3/54 reliable?
The price and inventory of SA40AHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40AHE3/54 is usually 5 days.
3.What payment methods are accepted for SA40AHE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40AHE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40AHE3/54?
SA40AHE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40AHE3/54 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 SA40AHE3/54?
For technical support, including SA40AHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40AHE3/54 requirements.
6.How does Aetrix verify that SA40AHE3/54 is sourced from the original manufacturer or authorized distributors?
All SA40AHE3/54 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 SA40AHE3/54 meets industry standards.
7.What is the process for return or replacement of SA40AHE3/54?
All SA40AHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA40AHE3/54, 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 SA40AHE3/54 part is unused and in its original packaging.
Return procedure for SA40AHE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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