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Taiwan Semiconductor Corporation SMAJ36H
- Part No.:
- SMAJ36H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36H.pdf
- Description:
- TVS DIODE 36VWM 64.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,077
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Product details
Overview
SMAJ36H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 36 V working stand-off voltage (VWM), 40.0–48.9 V breakdown voltage (VBR), 64.3 V maximum clamping voltage (VC) at 6.2 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive-grade SMPS and on-board DC/DC converters.
For engineers reviewing the SMAJ36H datasheet, SMAJ36H pinout, SMAJ36H application, or SMAJ36H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, AEC-Q101 qualification status, DO-214AC (SMA) package compatibility with automated placement, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMAJ36H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (40.0–48.9 V at 1 mA test current) to clamp transient energy into ground. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at 36 V).
With a fast response time <1.0 ps and thermal limit of TJ = –55°C to +150°C, it sustains repetitive surge events only within derated power limits above 25°C ambient - validated per Fig.2 derating curve and Fig.5 10/1000 µs waveform compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR min/max | 40.0 / 48.9 V @ 1 mA - Confirmed avalanche onset range; ensures reliable turn-on across process variation. |
| VC @ IPPM | 64.3 V @ 6.2 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling per standard 10/1000 µs waveform; supports high-energy automotive transients. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in battery-powered systems. |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking; compatible with J-STD-002 soldering and JESD201 Class 2 whisker resistance. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Weight ≈ 0.060 g. Meets UL 94V-0 flammability rating and J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to protected line (e.g., +12 V rail); conducts during positive surges when used in reverse-biased configuration. |
| Cathode | Reverse-bias reference terminal | Marked with band; tied to system ground or lower-potential node; defines unidirectional clamping direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use per stress test requirements including temperature cycling, HTRB, and ESD. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal and humidity stress. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity requirements. |
| Fast response time | <1.0 ps - Enables clamping before downstream ICs experience damaging overvoltage. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs. |
Applications
| Automotive Power Supply Protection | Industrial DC/DC Converter Input |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to shunt surge energy away from regulator ICs and microcontrollers. Use Value: Clamps to 64.3 V at 6.2 A, limiting stress below 70 V - sufficient headroom for 40 V-rated input stages in automotive PMICs. |
Use Scenario: Safeguarding isolated DC/DC converter primary-side inputs in factory automation controllers. IC Role / Device Role / Timing Role: Standoff protector on 36 V nominal input bus exposed to switching noise and inductive kickback from relay drivers. Use Value: 36 V VWM aligns precisely with system nominal voltage; 400 W PPPM handles repeated 10/1000 µs surges without degradation. |
| LED Driver Power Stage | Telecom Power Adapter Output |
|
Use Scenario: Overvoltage suppression on constant-current LED driver outputs subject to open-circuit transients. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to output return, activated only during reverse-polarity or inductive flyback events. Use Value: Low IR (<1 µA) prevents false triggering during normal operation; DO-214AC footprint enables compact layout near power FETs. |
Use Scenario: Secondary-side transient protection in universal-input AC/DC adapters powering PoE injectors. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 36 V output rail, guarding against cross-regulation overshoot and hot-plug spikes. Use Value: 64.3 V VC ensures connected equipment remains within 70 V absolute maximum rating; AEC-Q101 grade adds supply chain confidence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ36AHE3/5A | Bidirectional variant (CA suffix); symmetric clamping in both polarities; same VWM/VBR/VC specs but dual-direction capability. | Required where bidirectional surges occur (e.g., data lines, AC-coupled interfaces); not suitable for unidirectional-only rail protection without redesign. | Select SMAJ36H for dedicated DC rail clamping; choose SMAJ36AHE3/5A only if reverse-polarity transients must also be suppressed. |
| ON Semiconductor SMAJ36A | Same VWM (36 V), slightly higher VBR min (40.0 V), identical VC (64.3 V), but rated at 300 W PPPM above 78 V - no derating noted for 36 V part; RoHS-compliant but not AEC-Q101 qualified. | Acceptable for industrial/commercial use; unsuitable for automotive OEM programs requiring AEC-Q101 evidence. | Prefer SMAJ36H where automotive qualification, ISO 7637-2 validation, or full 400 W rating at 36 V is mandatory. |
Compared with Littelfuse SMAJ36AHE3/5A and ON Semiconductor SMAJ36A, the SMAJ36H delivers AEC-Q101 assurance and full 400 W rating at its 36 V rating point - critical for automotive power modules where transient margin and qualification traceability are non-negotiable.
Availability
SMAJ36H is available at Aetrix Electronics and suitable for automotive power supply protection, industrial DC/DC converter input stages, and LED driver power stage applications requiring stable component supply, AEC-Q101 compliance, and repeatable clamping performance.
Supply support for SMAJ36H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SMAJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient immunity in harsh automotive and industrial environments - emphasizing low clamping voltage, fast response, and long-term reliability under thermal cycling.
FAQ
What is the maximum clamping voltage of the SMAJ36H under standard surge conditions?
The SMAJ36H exhibits a maximum clamping voltage (VC) of 64.3 V when subjected to its rated peak pulse current of 6.2 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and represents the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the SMAJ36H suitable for automotive applications?
Yes, the SMAJ36H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards. Its DO-214AC package, glass-passivated junction, and guaranteed clamping performance across –55°C to +150°C junction temperature make it appropriate for engine control units, body control modules, and other automotive electronic systems.
How does the SMAJ36H differ from the SMAJ36AH variant?
The SMAJ36AH has a tighter breakdown voltage range (40.0–44.2 V vs. 40.0–48.9 V for SMAJ36H) and slightly lower clamping voltage (58.1 V vs. 64.3 V at same IPPM), achieved via tighter process control. Both share identical VWM (36 V), package, and AEC-Q101 qualification - SMAJ36AH suits designs demanding tighter VBR tolerance, while SMAJ36H offers broader statistical distribution for cost-sensitive volume applications.
What is the reverse leakage current specification for the SMAJ36H at its working voltage?
The SMAJ36H specifies a maximum reverse leakage current (IR) of 1 µA when biased at its full working stand-off voltage of 36 V. This low leakage ensures minimal power loss in always-on systems such as automotive infotainment or telematics modules, and avoids false triggering in high-impedance sensing circuits.
Does the SMAJ36H require heatsinking in typical applications?
No, the SMAJ36H is rated for 1 W steady-state power dissipation and relies on PCB copper area for thermal management during transient events. Its 400 W peak pulse rating applies only to non-repetitive 10/1000 µs surges; continuous power handling remains limited to 1 W - sufficient for most protection roles without additional heatsinking, provided layout follows recommended pad dimensions per TSC's DO-214AC outline.
SMAJ36H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 64.3V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
SMAJ36H FAQ
1.How can I place an order for SMAJ36H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36H 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 SMAJ36H reliable?
The price and inventory of SMAJ36H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36H is usually 5 days.
3.What payment methods are accepted for SMAJ36H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36H?
SMAJ36H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36H 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 SMAJ36H?
For technical support, including SMAJ36H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36H requirements.
6.How does Aetrix verify that SMAJ36H is sourced from the original manufacturer or authorized distributors?
All SMAJ36H 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 SMAJ36H meets industry standards.
7.What is the process for return or replacement of SMAJ36H?
All SMAJ36H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36H, 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 SMAJ36H part is unused and in its original packaging.
Return procedure for SMAJ36H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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