My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SA40HE3/73
- Part No.:
- SA40HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40HE3/73.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,348
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA40HE3/73 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 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, 500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA40HE3/73 datasheet, SA40HE3/73 pinout, SA40HE3/73 application, or SA40HE3/73 equivalent, this device is selected for robust ESD and surge protection in automotive body electronics, industrial sensor interfaces, and 24 V DC power input stages where stable clamping performance and high surge immunity are required.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA reverse leakage at 40 V), then rapidly avalanches below 50 V to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low incremental surge resistance.
The SA40HE3/73 is rated for 70 A non-repetitive forward surge current (IFSM, 10 ms half-sine), supports continuous power dissipation of 3.0 W on infinite heatsink at TL = 75 °C, and maintains operation across –55 °C to +175 °C junction temperature range - enabling use in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Tight 5 % tolerance ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 64.5 V at 7.8 A (10/1000 µs) - Clamps induced surges to a level compatible with 65 V-rated MOSFETs and logic ICs. |
| PPPM | 500 W - Sustains industry-standard lightning/surge pulses (IEC 61000-4-5 Level 3) without degradation. |
| IFSM | 70 A - Withstands repetitive load-dump events common in 12/24 V automotive electrical systems. |
| TJ max. | +175 °C - Enables placement near heat sources (e.g., power converters) without derating concerns. |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronic components including temperature cycling, HTRB, and ESD. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point during clamping | Connected to protected line (e.g., 24 V supply); conducts transient current to ground when VBR exceeded. |
| Cathode | Reverse-biased terminal during normal operation | Marked with color band; tied to system ground or low-impedance return path to complete clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and eliminates parameter drift due to moisture or contamination. |
| 500 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 combination wave surges up to 1 kV/500 A without failure. |
| AEC-Q101 qualification | Validated for automotive under-hood applications including temperature cycling, humidity bias, and mechanical shock. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected devices compared to higher-ratio TVS diodes. |
| RoHS-compliant HE3 suffix | Meets JESD 201 Class 2 whisker resistance, suitable for high-reliability industrial and automotive PCB assemblies. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power rails against load dump and ISO 7637-2 pulse 5a/b. IC Role / Device Role: Primary shunt clamp on 24 V supply input and sensor signal returns. Use Value: Limits transient voltage to ≤64.5 V, preventing latch-up or gate oxide damage in 65 V-rated power management ICs. |
Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges and ESD events. IC Role / Device Role: Front-end protection element before optocoupler or Schmitt-trigger input stage. Use Value: Absorbs >500 W surge energy while maintaining <1 µA leakage at 40 V, preserving input threshold accuracy. |
| Telecom Power Supply Input Stage | Automotive HVAC Blower Motor Driver |
Use Scenario: Secondary overvoltage protection on AC/DC adapter output rails feeding sensitive PHY ICs. IC Role / Device Role: Fast-response clamp parallel to bulk capacitor, suppressing switching noise and line transients. Use Value: Sub-nanosecond response time prevents voltage overshoot beyond 64.5 V during fast-rising 100 ns spikes. |
Use Scenario: Suppressing inductive kickback from brushed DC motor commutation in climate control systems. IC Role / Device Role: Bidirectional suppression across motor terminals (used in pair) or unidirectional clamp on driver supply rail. Use Value: Withstands 70 A single-pulse surge (10 ms) without parametric shift, ensuring long-term reliability in cyclic duty. |
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-E3/5A | Same VWM (40 V), lower PPPM (400 W), SMA package (surface-mount) | Requires PCB rework for SMT layout; lacks AEC-Q101 qualification | Select when board space is constrained and automotive qualification is not required. |
| 1.5KE40A | Higher VC (69.4 V), same PPPM (500 W), DO-201AD package (larger lead spacing) | Less precise clamping margin for 65 V-rated ICs; not AEC-Q101 qualified | Choose only for cost-sensitive industrial designs where tighter VC is non-critical. |
Compared with SMAJ40A-E3/5A and 1.5KE40A, the SA40HE3/73 delivers superior clamping precision (64.5 V vs. ≥69.4 V), guaranteed automotive qualification, and optimized thermal performance in the DO-15 through-hole package - making it the preferred choice for mission-critical 24 V system protection.
Availability
SA40HE3/73 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input modules, and telecom power supply protection requiring stable component supply and long-term lifecycle support.
Supply support for SA40HE3/73 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SAxxA series was developed specifically for robust transient suppression in harsh automotive and industrial environments, emphasizing AEC-Q101 compliance, tight VBR tolerance, and repeatable clamping performance under surge stress.
FAQ
What is the maximum clamping voltage of the SA40HE3/73 under standard surge conditions?
The SA40HE3/73 has a maximum clamping voltage (VC) of 64.5 V at 7.8 A peak pulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that protected circuitry will not experience voltages exceeding 64.5 V during standardized surge events - critical for compatibility with 65 V-rated power switches and interface ICs in the SA40HE3/73 design envelope.
Is the SA40HE3/73 suitable for automotive applications?
Yes, the SA40HE3/73 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junction, matte tin-plated leads meeting JESD 201 Class 2 whisker resistance, and operation up to +175 °C junction temperature - all validated per automotive stress test requirements. The SA40HE3/73 is commonly deployed in BCMs, lighting modules, and HVAC controls where reliability under thermal cycling and vibration is mandatory.
How does the SA40HE3/73 differ from bi-directional TVS diodes like SA40CA?
The SA40HE3/73 is a uni-directional TVS diode, meaning it blocks voltage in one direction (cathode-to-anode) and clamps only in reverse bias - ideal for DC power rail protection. In contrast, SA40CA is bi-directional and clamps symmetrically in both polarities, suited for AC lines or data bus protection. The SA40HE3/73 exhibits lower leakage (<1 µA at 40 V) and higher IFSM (70 A) than its bi-directional counterpart, which trades off forward surge capability for dual-polarity clamping.
What is the meaning of the 'HE3' suffix in SA40HE3/73?
The 'HE3' suffix in SA40HE3/73 indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. The 'H' denotes AEC-Q101 qualification, 'E3' specifies matte tin plating meeting commercial-grade RoHS requirements and enhanced whisker mitigation - distinguishing it from base 'E3' parts (non-automotive) and confirming suitability for high-reliability automotive PCB assembly in the SA40HE3/73 specification.
Can the SA40HE3/73 be used in parallel for higher surge handling?
No, the SA40HE3/73 is not recommended for parallel operation due to VBR mismatch (±5 % tolerance), which causes uneven current sharing and potential thermal runaway. For higher surge capacity, select a single higher-rated device such as SA43HE3/73 (43 V VWM) or consult Vishay's application note AN934 for derated multi-device layouts. The SA40HE3/73 is engineered for standalone protection in its specified 500 W rating.
SA40HE3/73 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):
- 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)
SA40HE3/73 FAQ
1.How can I place an order for SA40HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40HE3/73 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 SA40HE3/73 reliable?
The price and inventory of SA40HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40HE3/73 is usually 5 days.
3.What payment methods are accepted for SA40HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40HE3/73?
SA40HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40HE3/73 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 SA40HE3/73?
For technical support, including SA40HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40HE3/73 requirements.
6.How does Aetrix verify that SA40HE3/73 is sourced from the original manufacturer or authorized distributors?
All SA40HE3/73 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 SA40HE3/73 meets industry standards.
7.What is the process for return or replacement of SA40HE3/73?
All SA40HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA40HE3/73, 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 SA40HE3/73 part is unused and in its original packaging.
Return procedure for SA40HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA40HE3/73 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
