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Vishay General Semiconductor - Diodes Division SA40HE3/54
- Part No.:
- SA40HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40HE3/54.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,695
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Product details
Overview
SA40HE3/54 from Vishay General Semiconductor is a uni-directional TransZORB® transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 7.8 A peak pulse current, and 500 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SA40HE3/54 datasheet, SA40HE3/54 pinout, SA40HE3/54 application, or SA40HE3/54 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-15 mechanical dimensions, clamping performance under 10/1000 µs surge, and direct alternatives with documented VWM, VC, and IPPM differences.
Technical Context
This TVS diode operates as a uni-directional overvoltage clamp, conducting only when reverse voltage exceeds VBR; forward conduction is limited to ≤3.5 V at 100 A. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for suppressing ESD and load-dump transients before downstream components fail.
Designed for surface-mount or through-hole PCB assembly, it uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker resistance (HE3 suffix). Thermal derating follows a linear curve from 3.0 W at TL = 75 °C to zero at TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level surge immunity threshold. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM without premature conduction. |
| VC @ IPPM | 64.5 V at 7.8 A (10/1000 µs) - Clamping voltage defines worst-case stress on protected ICs during standardized surge events. |
| PPPM | 500 W - Peak pulse power rating determines survivability under repetitive 10/1000 µs transients at 0.01 % duty cycle. |
| IFSM | 70 A (8.3 ms half-sine) - Surge current rating validates robustness against automotive load-dump pulses per ISO 7637-2. |
| TJ max | 175 °C - Maximum junction temperature supports operation in under-hood automotive environments and high-ambient industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC specification. |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, molded epoxy case meeting UL 94 V-0; cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference ground | Connected to circuit ground or low-side return path; defines polarity-sensitive clamping direction. |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 40 V supply rail); conducts transient energy to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables <1 ns response time and stable VBR over lifetime, critical for ESD protection of high-speed interfaces. |
| 500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) without degradation in standard PCB layouts. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain and body electronics where field failure risk must be minimized. |
| Matte tin plating, JESD 201 Class 2 | Prevents tin whisker growth in high-reliability applications, eliminating latent short-circuit risk over 15+ year service life. |
| UL 94 V-0 molding compound | Ensures flame retardancy in enclosed industrial control cabinets and EV battery management systems. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 40 V battery-fed ECUs from load-dump transients up to 120 V during alternator regulation faults. IC Role / Device Role / Timing Role: Uni-directional TVS clamp placed between battery rail and input stage of DC-DC controller. Use Value: Limits voltage seen by controller IC to ≤64.5 V during 7.8 A surges, preventing latch-up or gate oxide rupture. |
Use Scenario: Shielding analog outputs of pressure sensors in hydraulic control valves from inductive kickback. IC Role / Device Role / Timing Role: Low-capacitance TVS on 4–20 mA loop output line, grounded at controller end. Use Value: Clamps transients within 1 ns while adding <0.5 pF parasitic capacitance, preserving 10 kHz signal bandwidth. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drivers |
Use Scenario: Safeguarding PoE-powered Ethernet switches against lightning-induced surges on 48 V DC input rails. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converter and hot-swap controller. Use Value: Absorbs 500 W pulses without thermal runaway, maintaining <3.0 W steady-state dissipation at 75 °C lead temp. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Parallel-mounted across motor terminals to shunt inductive energy into chassis ground. Use Value: Withstands 70 A single-half-sine surges (8.3 ms), enabling reliable operation over 10,000+ motor cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/52 (Vishay) | Same VWM (40 V), lower PPPM (400 W), SMA package (smaller footprint, lower IPPM = 6.4 A). | Preferred for space-constrained consumer PCBs where 400 W surge capacity suffices. | Select SMAJ40A-E3/52 when board area is limited and peak surge current remains ≤6.4 A. |
| 1.5KE40A (ON Semiconductor) | Same VWM (40 V), identical DO-15 package, but higher VC (69.4 V) and lower IPPM (6.1 A) at same PPPM. | Suitable for non-automotive industrial use where AEC-Q101 is not required. | Choose 1.5KE40A only if AEC-Q101 qualification is unnecessary and clamping voltage margin allows 69.4 V. |
Compared with SA40HE3/54, SMAJ40A-E3/52 trades surge robustness for compactness, while 1.5KE40A sacrifices AEC-Q101 validation and clamping tightness for cost-sensitive legacy designs - neither is pin-compatible, but all three share DO-15/SMA mechanical compatibility with appropriate pad layout adjustments.
Availability
SA40HE3/54 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor protection, telecom DC feeds, and consumer appliance motor drivers requiring stable component supply and AEC-Q101 compliance.
Supply support for SA40HE3/54 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, efficiency, and automotive-grade qualification.
The SAxxA series was engineered specifically for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom infrastructure where failure modes demand validated surge endurance and thermal stability.
FAQ
What is the clamping voltage of SA40HE3/54 at its rated peak pulse current?
The SA40HE3/54 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 Figure 7 in Vishay document 88378 and defines the upper voltage limit imposed on protected circuits during surge events. The SA40HE3/54 maintains this clamping performance across its full operating temperature range.
Is SA40HE3/54 suitable for automotive applications?
Yes, SA40HE3/54 is AEC-Q101 qualified, with test evidence covering temperature cycling, highly accelerated life testing (HALT), and ESD per JESD22-A114. Its 175 °C maximum junction temperature, 70 A surge rating, and DO-15 mechanical robustness make it appropriate for engine control units, body electronics, and battery management systems. The HE3 suffix confirms JESD 201 Class 2 whisker resistance, a key requirement for automotive longevity.
What does the "HE3" suffix mean in SA40HE3/54?
The "HE3" suffix in SA40HE3/54 indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 tin whisker mitigation. Unlike the base "E3" variant (commercial grade), HE3 guarantees enhanced reliability for automotive and industrial deployments where long-term intermetallic growth could cause field failures. This designation is explicitly defined in Vishay's ordering information table on page 3 of document 88378.
How does SA40HE3/54 differ from bi-directional SA40CA variants?
SA40HE3/54 is uni-directional and features a cathode band for polarity-sensitive placement; SA40CA is bi-directional with no marking and symmetrical clamping in both directions. The SA40HE3/54 has a forward voltage drop ≤3.5 V at 100 A, while SA40CA lacks forward conduction capability. For DC-biased lines like 40 V supplies, SA40HE3/54 provides tighter clamping and lower leakage; SA40CA suits AC-coupled or floating signal lines.
What is the thermal derating behavior of SA40HE3/54 above 75 °C lead temperature?
SA40HE3/54 derates linearly from 3.0 W at TL = 75 °C to 0 W at TJ = 175 °C, per Figure 5 in Vishay document 88378. For example, at TL = 100 °C, allowable steady-state power drops to ~2.2 W. This derating applies to continuous dissipation-not surge events-and assumes 0.375" (9.5 mm) lead length. Designers must verify board-level thermal paths to maintain safe junction temperatures during sustained overload conditions.
SA40HE3/54 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 7A
- 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)
SA40HE3/54 FAQ
1.How can I place an order for SA40HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40HE3/54 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 SA40HE3/54 reliable?
The price and inventory of SA40HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40HE3/54 is usually 5 days.
3.What payment methods are accepted for SA40HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40HE3/54?
SA40HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40HE3/54 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 SA40HE3/54?
For technical support, including SA40HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40HE3/54 requirements.
6.How does Aetrix verify that SA40HE3/54 is sourced from the original manufacturer or authorized distributors?
All SA40HE3/54 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 SA40HE3/54 meets industry standards.
7.What is the process for return or replacement of SA40HE3/54?
All SA40HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA40HE3/54, 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 SA40HE3/54 part is unused and in its original packaging.
Return procedure for SA40HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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