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Vishay General Semiconductor - Diodes Division SMAJ36AHE3/5A
- Part No.:
- SMAJ36AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36AHE3/5A.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,100
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Product details
Overview
SMAJ36AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on DC power rails and signal lines. It features a 36 V stand-off voltage (VWM), 40.0–44.2 V breakdown voltage (VBR) at 1 mA, 58.1 V maximum clamping voltage (VC) at 6.9 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform). It is AEC-Q101 qualified and used to protect MOSFETs and ICs in automotive power supply circuits.
For engineers reviewing the SMAJ36AHE3/5A datasheet, SMAJ36AHE3/5A pinout, SMAJ36AHE3/5A application, or SMAJ36AHE3/5A equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, junction temperature derating above 25 °C, unidirectional polarity marking (cathode band), and compliance with automotive transient immunity standards such as ISO 7637-2.
Technical Context
This TVS diode operates as a voltage-clamping protection device that remains high-impedance below VWM (36 V) and rapidly avalanches into low-impedance conduction when transient voltage exceeds VBR (min. 40.0 V). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
It delivers 400 W peak pulse power (10/1000 μs) with 58.1 V clamping at 6.9 A, and exhibits a temperature coefficient of VBR of +0.100 %/°C - critical for predicting breakdown shift over operating temperature range (−55 °C to +150 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 36 V - maximum continuous reverse working voltage before significant leakage; defines upper limit of normal circuit operation. |
| VBR (Breakdown Voltage) | 40.0–44.2 V at 1 mA - voltage at which device enters avalanche conduction; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 58.1 V at IPPM = 6.9 A - maximum voltage seen by protected circuit during 10/1000 μs surge; must stay below downstream IC's absolute max rating. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - surge energy handling capacity; derates to 300 W above 78 V, but SMAJ36AHE3/5A fully utilizes 400 W rating. |
| IR (Reverse Leakage) | <1.0 μA at 36 V - negligible standby current draw; avoids loading sensitive reference or bias networks. |
| TJ Max | +150 °C - maximum junction temperature; enables use in under-hood automotive environments with proper PCB thermal relief. |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs required board-level heatsinking for sustained surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by a single band on the body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line (e.g., 36 V rail); conducts surge current to ground when voltage exceeds VBR. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and surge endurance - suitable for engine control units and ADAS power supplies. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3a/b (load dump simulation) without degradation. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over time and temperature - critical for long-life automotive deployments. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns or baking requirements. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD or relay bounce), improving protection margin. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Protecting 36 V battery-fed microcontroller power inputs against load dump and alternator ripple in commercial vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy away from LDO input and MCU VDD pins during ISO 7637-2 Pulse 5a. Use Value: Limits voltage to ≤58.1 V during 6.9 A surges, preserving MCU functionality where absolute max rating is 60 V. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA transmitter) from ESD and inductive kickback in factory automation I/O modules. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed between sensor output and isolation amplifier input to prevent latch-up or damage. Use Value: Sub-1 ns response time and 58.1 V clamping ensure signal integrity is maintained even during 8 kV contact ESD events. |
| DC-DC Converter Input Protection | MOSFET Gate Driver Supply Clamp |
Use Scenario: Safeguarding buck converter input stage against voltage spikes induced by long cable runs in solar charge controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 36 V PV input rail upstream of controller IC and input capacitors. Use Value: 400 W rating handles repetitive 10/1000 μs surges up to 0.01% duty cycle without thermal runaway or parameter shift. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFET drivers subjected to Miller-induced voltage spikes. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across gate-source terminals to clamp ringing exceeding ±20 V. Use Value: 1.0 μA leakage at 36 V avoids unintended gate discharge; 58.1 V VC stays within typical 60 V gate rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A-E3/5A | No AEC-Q101 qualification; same electrical specs and SMA package. | Restricted to commercial/industrial use; not approved for automotive production. | Select when automotive qualification is unnecessary and cost sensitivity is higher. |
| SMBJ36AHE3/5A | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating. | Higher power handling supports longer surge durations or higher repetition rates; requires larger PCB footprint. | Choose when system-level testing reveals marginal margin with 400 W rating or when thermal dissipation is constrained. |
Compared with SMAJ36AHE3/5A, the SMAJ36A-E3/5A offers identical protection performance without automotive qualification, while the SMBJ36AHE3/5A trades smaller footprint for 50 % higher surge power and improved thermal mass - enabling longer surge hold times in high-reliability industrial designs.
Availability
SMAJ36AHE3/5A is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ36AHE3/5A 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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMAJ36AHE3/5A at its rated peak pulse current?
The SMAJ36AHE3/5A has a maximum clamping voltage (VC) of 58.1 V at its specified peak pulse current (IPPM) of 6.9 A under a 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees the protected circuit will not experience voltages beyond this threshold during standardized surge events - a critical parameter when interfacing with 60 V-tolerant ICs or MOSFETs. The SMAJ36AHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ36AHE3/5A suitable for automotive applications?
Yes, SMAJ36AHE3/5A is AEC-Q101 qualified, meaning it has passed rigorous stress tests for automotive use including temperature cycling, humidity, mechanical shock, and surge endurance. Its construction - glass-passivated junction, MSL Level 1 reflow compatibility, and −55 °C to +150 °C operating range - meets requirements for under-hood and cabin-mounted ECUs. The "HE3" suffix explicitly denotes AEC-Q101 compliance, distinguishing it from commercial-grade variants like SMAJ36A-E3/5A.
How does the unidirectional configuration of SMAJ36AHE3/5A affect circuit placement?
The SMAJ36AHE3/5A is unidirectional, with polarity marked by a cathode band. It must be installed with the banded end toward the side of higher potential (e.g., connected to the 36 V rail), and the anode tied to ground or lower-potential reference. Reversing polarity prevents clamping action and may cause catastrophic failure during forward-biased surge conditions. Unlike bidirectional types (e.g., SMAJ36CA), SMAJ36AHE3/5A does not suppress negative-going transients - making correct orientation essential in DC systems.
What is the thermal resistance of SMAJ36AHE3/5A, and how does it impact layout design?
SMAJ36AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value directly determines allowable power dissipation at elevated ambient temperatures - for example, at TA = 85 °C, the maximum continuous power drops to ~2.7 W. To sustain repeated surge events, designers should add thermal vias and extended copper pours to reduce effective RθJA, especially in enclosed automotive enclosures where airflow is limited. The SMAJ36AHE3/5A's RθJL of 30 °C/W further supports efficient heat transfer to PCB traces.
Can SMAJ36AHE3/5A replace SMAJ33AHE3/5A or SMAJ40AHE3/5A in existing designs?
SMAJ36AHE3/5A is not a direct drop-in replacement for SMAJ33AHE3/5A or SMAJ40AHE3/5A due to differences in VWM (33 V vs. 36 V vs. 40 V) and corresponding VBR/VC values. Using SMAJ36AHE3/5A in place of SMAJ33AHE3/5A risks insufficient clamping margin if the protected circuit operates near 33 V, while substituting for SMAJ40AHE3/5A may allow damaging overvoltage before clamping engages. Each SMAJ variant is optimized for specific rail voltages - SMAJ36AHE3/5A is strictly intended for 36 V nominal systems. Always verify VWM alignment with system operating voltage before substitution.
SMAJ36AHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ36AHE3/5A FAQ
1.How can I place an order for SMAJ36AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36AHE3/5A 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 SMAJ36AHE3/5A reliable?
The price and inventory of SMAJ36AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ36AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36AHE3/5A?
SMAJ36AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36AHE3/5A 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 SMAJ36AHE3/5A?
For technical support, including SMAJ36AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36AHE3/5A requirements.
6.How does Aetrix verify that SMAJ36AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ36AHE3/5A 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 SMAJ36AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ36AHE3/5A?
All SMAJ36AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36AHE3/5A, 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 SMAJ36AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ36AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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