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Taiwan Semiconductor Corporation SMAJ36A
- Part No.:
- SMAJ36A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36A.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:19,010
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Product details
Overview
SMAJ36A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 36 V working stand-off voltage (VWM), 40.0–44.2 V breakdown voltage (VBR), and clamps to ≤58.1 V at 6.9 A peak impulse current under 10/1000 µs waveform, delivering 400 W peak pulse power.
For engineers reviewing the SMAJ36A datasheet, SMAJ36A pinout, SMAJ36A application, or SMAJ36A equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, leakage current (<1 µA at 36 V), fast response (<1 ps), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMAJ36A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown and low leakage. Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, with thermal derating above 25°C per Fig.2 and non-repetitive peak power limited to 400 W at TA = 25°C.
It supports bidirectional applications only when paired with complementary devices or selected as bipolar variants (e.g., SMAJ36CA); the "A" suffix denotes tighter VBR tolerance (±5% vs. ±10% for non-A versions). Polarity is marked by cathode band, and it meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit of protected circuit's normal operating range. |
| VBR @ IT = 1 mA | 40.0–44.2 V - Breakdown voltage range defining onset of avalanche clamping; tighter tolerance improves design margin predictability. |
| VC @ IPPM = 6.9 A | ≤58.1 V - Clamped voltage during 10/1000 µs surge; must remain below protected device's absolute maximum rating. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; enables suppression of high-energy transients without failure. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; ensures negligible standby power loss and signal integrity in high-impedance nodes. |
| TJ Range | −55 °C to +150 °C - Operating junction temperature range; supports under-hood automotive and industrial environments. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode indicated by molded band. Dimensions conform to JEDEC standard; recommended pad layout provided in manufacturer datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side for unidirectional protection | Connected to transient source (e.g., power input trace); conducts during reverse surge to clamp voltage. |
| Cathode | Output/Load side / Ground reference | Connected to protected circuit ground or rail return; establishes polarity-sensitive clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over time and temperature, with low parameter drift in harsh environments. |
| Fast response time <1 ps | Enables suppression of nanosecond-scale ESD and switching transients before sensitive downstream components are stressed. |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching pulses (Pulse 1, 2a, 2b, 3a, 3b), supporting AEC-Q101-qualified designs. |
| Moisture sensitivity level 1 | Permits unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow. |
Applications
| Automotive Power Distribution | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and upstream fuse or DC/DC converter input. Use Value: Clamps surges up to 120 V (per ISO 7637-2 Pulse 5a) to ≤58.1 V, preserving MCU and CAN transceiver reliability. | Use Scenario: Safeguarding AC-DC adapter primary-side rectifier output or secondary-side DC bus. IC Role / Device Role / Timing Role: Standoff-rated TVS across bulk capacitor to absorb flyback spikes and line-induced surges. Use Value: Withstands 400 W peak pulses while maintaining <1 µA leakage, minimizing standby loss and enabling compact layout. |
| LED Driver Overvoltage Protection | On-board DC/DC Converter Input |
Use Scenario: Shielding constant-current LED drivers from supply rail transients in streetlight or signage systems. IC Role / Device Role / Timing Role: TVS connected between driver input and chassis ground, rated for 36 V nominal bus. Use Value: Tight VBR tolerance (40.0–44.2 V) ensures early clamping before LED string overvoltage damages driver FETs. | Use Scenario: Protecting point-of-load (POL) converters in telecom or server boards from upstream rail disturbances. IC Role / Device Role / Timing Role: Localized TVS on 3.3 V, 5 V, or 12 V input pins of buck controller ICs. Use Value: Low clamping voltage (≤58.1 V) and fast response prevent latch-up or gate oxide damage in synchronous MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36 | Wider VBR range (40.0–48.9 V) and higher VC (64.3 V); same package and PPPM. | Less precise clamping margin; suitable where tighter VBR control is not required. | Select SMAJ36A when clamping voltage headroom is constrained; choose SMAJ36 for cost-sensitive, less critical rails. |
| SMBJ36A | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating. | Higher surge capability and thermal mass; requires larger PCB footprint. | Choose SMBJ36A for higher reliability in repetitive surge environments; retain SMAJ36A for space-constrained layouts. |
Compared with SMAJ36 and SMBJ36A, the SMAJ36A delivers optimal balance of tight VBR tolerance, compact DO-214AC footprint, and sufficient 400 W surge capacity-making it preferred for automotive body control modules and dense DC/DC converter designs where layout area and clamping precision are critical.
Availability
SMAJ36A is available at Aetrix Electronics and suitable for automotive power distribution, industrial SMPS input stages, LED driver overvoltage protection, and on-board DC/DC converter input applications requiring stable component supply and full traceability.
Supply support for SMAJ36A 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, specializing in power management, protection, and signal conditioning devices.
The SMAJ series is part of TSC's transient voltage suppressor portfolio, engineered specifically for robust, surface-mount overvoltage protection in automotive, industrial, and consumer power systems with stringent ISO 7637-2 compliance requirements.
FAQ
What is the breakdown voltage range for SMAJ36A?
The SMAJ36A has a specified breakdown voltage (VBR) range of 40.0 V to 44.2 V at test current IT = 1 mA. This tighter ±5% tolerance (denoted by the "A" suffix) provides more predictable clamping onset compared to the standard SMAJ36 (±10%), enabling improved design margin control in safety-critical 36 V rail protection.
Is SMAJ36A suitable for bidirectional transient protection?
No, SMAJ36A is a unidirectional TVS diode intended for DC rail protection with defined polarity (cathode band marking). For bidirectional applications such as AC lines or data bus protection, use the bipolar variant SMAJ36CA. Using SMAJ36A in reverse-biased AC configurations may result in unintended conduction or failure.
What is the maximum clamping voltage of SMAJ36A under surge conditions?
The SMAJ36A clamps to a maximum of 58.1 V when subjected to its rated peak impulse current of 6.9 A under the standardized 10/1000 µs waveform. This value is measured at TA = 25°C and must be verified against the absolute maximum ratings of downstream components to ensure safe operation during transients.
Does SMAJ36A meet automotive qualification standards?
SMAJ36A complies with ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b) for automotive transient immunity and is constructed with JESD201 Class 2 whisker-resistant terminations and moisture sensitivity level 1. While not AEC-Q101 certified itself, it is widely deployed in AEC-Q101-compliant systems when validated within the full application context.
What packaging and reel quantity is offered for SMAJ36A?
SMAJ36A is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format, compatible with standard high-speed pick-and-place equipment. The matte tin-plated leads meet J-STD-002 solderability requirements, and the green molding compound satisfies RoHS and halogen-free (IEC 61249-2-21) mandates.
SMAJ36A 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:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ36A FAQ
1.How can I place an order for SMAJ36A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36A 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 SMAJ36A reliable?
The price and inventory of SMAJ36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36A is usually 5 days.
3.What payment methods are accepted for SMAJ36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36A?
SMAJ36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36A 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 SMAJ36A?
For technical support, including SMAJ36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36A requirements.
6.How does Aetrix verify that SMAJ36A is sourced from the original manufacturer or authorized distributors?
All SMAJ36A 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 SMAJ36A meets industry standards.
7.What is the process for return or replacement of SMAJ36A?
All SMAJ36A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36A, 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 SMAJ36A part is unused and in its original packaging.
Return procedure for SMAJ36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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