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Vishay General Semiconductor - Diodes Division SA45HE3/73
- Part No.:
- SA45HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45HE3/73.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
SA45HE3/73 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 1.0 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 body control modules, industrial PLC I/O protection, and 48 V telecom power interfaces.
For engineers reviewing the SA45HE3/73 datasheet, SA45HE3/73 pinout, SA45HE3/73 application, or SA45HE3/73 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-15 mechanical data, clamping performance under surge conditions, and direct alternatives for circuit-level ESD/surge hardening.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 45 V, it avalanches at VBR = 50.0–55.3 V and clamps transients to ≤72.7 V at 6.9 A (10/1000 µs). Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for protecting MOSFET gates and microcontroller I/O pins against inductive switching spikes.
Rated for -55 °C to +175 °C junction temperature, it supports high-reliability automotive applications per AEC-Q101. The HE3 suffix confirms RoHS compliance and JESD 201 Class 2 whisker resistance - essential for lead-free reflow and long-term solder joint integrity in engine bay or under-hood modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 48 V nominal systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 72.7 V at 6.9 A - Clamped voltage during 10/1000 µs surge; determines residual stress on downstream ICs like CAN transceivers. |
| PPPM | 500 W - Peak pulse power handling; sustains single 10/1000 µs transients common in ISO 7637-2 Pulse 1/2a/5a tests. |
| IFSM | 70 A - Non-repetitive forward surge current rating; validates robustness against accidental polarity reversal events. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in high-ambient environments such as automotive power distribution units. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
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 standards. Cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to protected line (e.g., 48 V rail); conducts during positive transients or accidental reverse bias. |
| Cathode | Clamping node / Surge sink | Connected to ground or low-impedance reference; provides low-impedance path to divert surge energy away from load. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables <1 ns response time and stable VBR tolerance across temperature and life cycle. |
| 500 W peak pulse power (10/1000 µs) | Withstands automotive load-dump surges up to ISO 7637-2 Pulse 5a without degradation. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, chassis, and body electronics requiring zero-failure field performance. |
| DO-204AC (DO-15) package | Industry-standard axial footprint compatible with legacy through-hole assembly and automated taping/reeling (73 mm reel). |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal/humidity stress - critical for 15+ year automotive module lifetimes. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 48 V supply inputs and LIN bus lines in BCMs exposed to alternator load dump and inductive switching noise. IC Role / Device Role / Timing Role: Shunt TVS diode placed between power rail and chassis ground to clamp transients before they reach MCU power domains and LIN transceivers. Use Value: Limits clamped voltage to 72.7 V, ensuring downstream 80 V-rated power management ICs remain within safe operating area during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) modules interfacing with solenoids and contactors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side input terminals to absorb inductive kickback from 24 V DC coils. Use Value: Withstands 70 A non-repetitive forward surge, preventing latch-up or destruction of optocoupler input stages during coil de-energization. |
| Telecom 48 V DC Power Interface | Automotive Infotainment USB Power Line |
Use Scenario: Secondary surge protection on -48 V telecom rectifier outputs feeding base station backplane power distribution. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 45 V) placed upstream of DC-DC converters to suppress lightning-induced surges on telecom plant wiring. Use Value: 500 W peak pulse rating handles IEC 61000-4-5 Level 4 (4 kV) surges while maintaining clamping below converter input absolute maximum ratings. |
Use Scenario: Input-side transient suppression on USB VBUS lines in automotive head units connected to vehicle 12 V system via buck-boost converters. IC Role / Device Role / Timing Role: Uni-directional TVS between converted 5 V rail and ground to block negative-going transients from reverse battery connection or load dump coupling. Use Value: AEC-Q101 qualification and +175 °C TJ max ensure uninterrupted operation in hot-cabin environments where ambient exceeds 85 °C. |
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-E3/5A | Same VWM (45 V), lower PPPM (400 W), SMA package (surface-mount) | Requires PCB redesign for SMT placement; lacks AEC-Q101 qualification | Select for space-constrained consumer electronics where automotive qualification is unnecessary. |
| 1.5KE45A | Same VWM (45 V), higher VC (73 V), larger DO-201AD package, 1500 W PPPM | Over-specified for 500 W needs; higher thermal mass slows response slightly | Choose only if legacy DO-201AD footprint must be retained and higher surge margin is required. |
Compared with SMAJ45A-E3/5A and 1.5KE45A, SA45HE3/73 offers AEC-Q101 qualification, optimized 500 W rating for automotive ISO 7637-2 compliance, and DO-15 through-hole compatibility with existing high-volume manufacturing lines - making it the preferred choice for new automotive and industrial designs requiring validated reliability.
Availability
SA45HE3/73 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and telecom 48 V power interfaces requiring stable component supply, long-lifecycle support, and AEC-Q101 traceability.
Supply support for SA45HE3/73 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, efficiency, and application-specific validation.
The SAxx series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where voltage spikes from inductive loads or ESD must be reliably clamped without failure.
FAQ
What is the clamping voltage of SA45HE3/73 at its rated peak pulse current?
The SA45HE3/73 has a maximum clamping voltage (VC) of 72.7 V at 6.9 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is measured per JEDEC standards. The SA45HE3/73 maintains this clamping performance across its full operating temperature range (-55 °C to +175 °C), making it suitable for under-hood automotive applications where thermal stability is critical.
Is SA45HE3/73 qualified for automotive use?
Yes, SA45HE3/73 is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix "HE3". This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥ 8 kV). The SA45HE3/73 is intended for use in automotive body control modules, lighting drivers, and infotainment power supplies where failure could impact functional safety. Its DO-204AC package and JESD 201 Class 2 whisker resistance further support long-term automotive deployment.
What does the "HE3" suffix mean in SA45HE3/73?
The "HE3" suffix in SA45HE3/73 indicates RoHS-compliant construction with JESD 201 Class 2 whisker resistance - exceeding the baseline "E3" (Class 1A) requirement. It also denotes AEC-Q101 qualification and matte tin-plated leads compliant with J-STD-002 solderability standards. The "73" denotes packaging in 73 mm diameter reels, standard for DO-15 components. This suffix ensures the SA45HE3/73 meets stringent automotive and industrial reliability requirements not satisfied by generic TVS diodes.
Can SA45HE3/73 be used in bi-directional protection circuits?
No, SA45HE3/73 is a uni-directional TVS diode, as indicated by the "A" (not "CA") suffix in its family designation and absence of bi-directional VBR specification in its datasheet row. It conducts only in reverse bias above VBR and blocks forward current up to 3.5 V at 100 A. For bi-directional protection - such as AC signal lines or differential buses - a part like SA45CA would be required. Using SA45HE3/73 in bi-directional applications risks forward conduction failure during positive transients.
What is the maximum steady-state power dissipation for SA45HE3/73?
The SA45HE3/73 has a maximum steady-state power dissipation (PD) of 3.0 W when mounted on an infinite heatsink at lead temperature (TL) = 75 °C, per Figure 5 in the Vishay datasheet. This rating applies to continuous DC or low-duty-cycle conditions - not transient suppression. In practical PCB layouts, derating is required based on copper area and airflow; typical board-level dissipation is 0.5–1.2 W. The SA45HE3/73 is not intended for continuous power regulation but for short-duration surge absorption.
SA45HE3/73 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):
- 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)
SA45HE3/73 FAQ
1.How can I place an order for SA45HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45HE3/73 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 SA45HE3/73 reliable?
The price and inventory of SA45HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45HE3/73 is usually 5 days.
3.What payment methods are accepted for SA45HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45HE3/73?
SA45HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45HE3/73 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 SA45HE3/73?
For technical support, including SA45HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45HE3/73 requirements.
6.How does Aetrix verify that SA45HE3/73 is sourced from the original manufacturer or authorized distributors?
All SA45HE3/73 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 SA45HE3/73 meets industry standards.
7.What is the process for return or replacement of SA45HE3/73?
All SA45HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA45HE3/73, 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 SA45HE3/73 part is unused and in its original packaging.
Return procedure for SA45HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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