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Vishay General Semiconductor - Diodes Division SA45HE3/54
- Part No.:
- SA45HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45HE3/54.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,351
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Product details
Overview
SA45HE3/54 from Vishay General Semiconductor is a uni-directional 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 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 6.9 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - used in automotive ECU power inputs and industrial sensor interfaces.
For engineers reviewing the SA45HE3/54 datasheet, SA45HE3/54 pinout, SA45HE3/54 application, or SA45HE3/54 equivalent, this AEC-Q101 qualified TVS offers validated surge immunity for 12 V and 24 V systems, RoHS-compliant matte tin leads, and JESD 201 Class 2 whisker resistance - critical for automotive-grade reliability validation and board-level ESD/transient hardening.
Technical Context
This uni-directional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 45 V, it avalanches into low-impedance conduction to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and fast response time (<1 ns), while the DO-204AC package supports 70 A non-repetitive forward surge current (IFSM) and 175 °C max junction temperature.
Clamping performance is defined per IEC 61000-4-5 (10/1000 μs) and ANSI/IEEE C62.35 standards. The device exhibits low incremental surge resistance (typ. <0.3 Ω), enabling effective suppression of inductive switching spikes (e.g., relay coil flyback) and lightning-induced surges on 24 V control bus lines without thermal runaway under repetitive duty cycles ≤0.01 %.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 24 V nominal systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system transients but below IC absolute maximum ratings. |
| VC @ IPPM | 72.7 V at 6.9 A - Clamped voltage during 500 W transient; limits stress on protected 75 V-rated MOSFETs or microcontrollers. |
| PPPM | 500 W - Peak pulse power handling with 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1 (inductive load dump) and IEC 61000-4-5 Level 3. |
| IFSM | 70 A - Non-repetitive forward surge current rating; supports robustness against accidental polarity reversal or high-energy fault conditions. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM ≥8 kV - required for Tier 1 supply chain compliance. |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, molded epoxy case meeting UL 94 V-0. Matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (banded end) | Forward current entry / Cathode reference | Connected to ground or low-impedance return path; defines unidirectional clamping direction from line-to-ground. |
| Cathode (non-banded end) | Transient current sink | Connected to protected line (e.g., 24 V rail); conducts avalanche current to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR over temperature and lifetime; eliminates parameter drift in high-humidity or thermally cycled environments. |
| 500 W peak pulse power (10/1000 μs) | Provides single-event surge immunity exceeding ISO 7637-2 Pulse 1 (−100 V/50 Ω) and IEC 61000-4-5 Combination Wave (1 kV/2 Ω) requirements. |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control, body electronics, and ADAS power domains without additional qualification effort. |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance - mandatory for long-life automotive modules exposed to thermal cycling. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes protected circuit overvoltage margin; allows tighter design margins for 75 V-rated components without derating penalties. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 24 V battery-fed ECU power input subjected to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Uni-directional shunt TVS placed between VIN and GND to clamp transients before LDO or DC/DC converter input. Use Value: Limits voltage to ≤72.7 V during 500 W surges, protecting 75 V-rated input capacitors and PMICs without derating. |
Use Scenario: 4–20 mA current loop interface in PLC analog I/O module exposed to field wiring ESD and inductive coupling. IC Role / Device Role / Timing Role: Line-to-ground TVS on transmitter output to suppress ±8 kV contact ESD (IEC 61000-4-2) and 1 kV surge (IEC 61000-4-5). Use Value: Sub-1 ns response prevents latch-up in op-amps and ADC drivers; low leakage (<1 μA at 45 V) avoids loop current error. |
| Telecom DC Power Feeder Protection | Consumer Appliance Motor Drive Supply Clamp |
Use Scenario: -48 V DC telecom rectifier output feeding remote radio units, subject to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary protection stage before secondary TVS array and DC/DC isolation; mounted at board edge. Use Value: 500 W rating handles 10/1000 μs surges up to 1 kV; DO-204AC mechanical robustness withstands vibration in base station cabinets. |
Use Scenario: 24 V supply rail for BLDC motor driver in smart HVAC system, exposed to back-EMF from commutation and relay switching. IC Role / Device Role / Timing Role: Rail-to-ground TVS parallel to bulk capacitor to absorb inductive kickback energy from H-bridge freewheeling paths. Use Value: 70 A IFSM rating tolerates repeated motor stall currents; 175 °C TJ max supports enclosed thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/54 | Same VWM (45 V), lower PPPM (400 W), SMA package (surface-mount) | Requires PCB rework for SMT layout; lacks AEC-Q101 qualification | Select for space-constrained consumer designs where automotive qualification is unnecessary. |
| 1.5KE45A | Same VWM (45 V), higher VC (73 V), through-hole DO-201AD package, no AEC-Q101 | Larger footprint; not validated for automotive thermal cycling or humidity testing | Choose for cost-sensitive industrial controls where AEC-Q101 is not mandated. |
Compared with SMAJ45A-E3/54 and 1.5KE45A, SA45HE3/54 delivers AEC-Q101 assurance, identical clamping performance, and DO-204AC mechanical compatibility with legacy through-hole production lines - making it the only drop-in qualified replacement for automotive 24 V systems requiring zero layout change and full compliance traceability.
Availability
SA45HE3/54 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog I/O modules, telecom DC power feeders, and consumer appliance motor drive circuits requiring stable component supply with full AEC-Q101 documentation and RoHS traceability.
Supply support for SA45HE3/54 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, power handling, and automotive qualification.
The SAxx series targets high-energy transient suppression in harsh environments; engineered specifically for ISO 7637-2 and IEC 61000-4-5 compliance in automotive, industrial, and telecom infrastructure applications.
FAQ
What is the clamping voltage of SA45HE3/54 at its rated peak pulse current?
The SA45HE3/54 has a maximum clamping voltage (VC) of 72.7 V at 6.9 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuits during transient events. The SA45HE3/54 maintains this clamping performance across its specified operating temperature range and is validated in Vishay's 88378 datasheet.
Is SA45HE3/54 suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SA45HE3/54 is explicitly AEC-Q101 qualified, as confirmed in the Vishay document 88378 (Revision: 18-Sep-12), footnote (1) on page 3. The HE3 suffix denotes both RoHS compliance and AEC-Q101 qualification, including stress testing for high-temperature operating life, temperature cycling, and ESD. This makes SA45HE3/54 appropriate for engine control units, body control modules, and other automotive subsystems requiring certified reliability.
What is the difference between SA45HE3/54 and SA45A-E3/54?
SA45HE3/54 is AEC-Q101 qualified and meets JESD 201 Class 2 whisker resistance, while SA45A-E3/54 is commercial-grade (JESD 201 Class 1A). Both share identical electrical specs (VWM = 45 V, VBR = 50.0–55.3 V, VC = 72.7 V), DO-204AC package, and RoHS compliance. The HE3 suffix adds automotive-grade process controls and extended reliability validation - essential for Tier 1 automotive supply chains where SA45HE3/54 is mandated.
Can SA45HE3/54 be used in bi-directional protection circuits?
No, SA45HE3/54 is a uni-directional TVS diode, as indicated by the "A" suffix (e.g., SA45A) and absence of "CA" in the part number. Bi-directional variants like SA45CA have symmetric breakdown in both polarities and no polarity marking. Using SA45HE3/54 in bi-directional configurations would result in forward conduction and failure during negative transients. For AC or dual-polarity protection, select SA45CA or equivalent bi-directional parts.
What is the maximum operating temperature for SA45HE3/54?
The SA45HE3/54 has a maximum junction temperature (TJ) of +175 °C and an operating junction/storage temperature range of −55 °C to +175 °C. This rating is confirmed in the "Maximum Ratings" table of Vishay document 88378. The high TJ enables use in under-hood automotive locations and sealed industrial enclosures where ambient temperatures exceed 125 °C, provided PCB thermal design maintains junction temperature within limit.
SA45HE3/54 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
SA45HE3/54 FAQ
1.How can I place an order for SA45HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45HE3/54 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 SA45HE3/54 reliable?
The price and inventory of SA45HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45HE3/54 is usually 5 days.
3.What payment methods are accepted for SA45HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45HE3/54?
SA45HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45HE3/54 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 SA45HE3/54?
For technical support, including SA45HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45HE3/54 requirements.
6.How does Aetrix verify that SA45HE3/54 is sourced from the original manufacturer or authorized distributors?
All SA45HE3/54 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 SA45HE3/54 meets industry standards.
7.What is the process for return or replacement of SA45HE3/54?
All SA45HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA45HE3/54, 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 SA45HE3/54 part is unused and in its original packaging.
Return procedure for SA45HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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