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Taiwan Semiconductor Corporation SMF36A
- Part No.:
- SMF36A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF36A.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:4,789
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Product details
Overview
SMF36A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor diode designed for high-energy ESD and surge protection in DC power lines and signal paths. It features a 36 V working stand-off voltage, 40.0–44.2 V breakdown voltage at 1 mA test current, 58.1 V maximum clamping voltage at 3.4 A peak pulse current (10/1000 µs), and 200 W peak pulse power rating. It is widely used in automotive body electronics and industrial sensor interfaces requiring IEC 61000-4-2/4-4/4-5 compliance.
For engineers reviewing the SMF36A datasheet, SMF36A pinout, SMF36A application, or SMF36A equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, leakage current below 1 µA at 36 V, SOD-123W package compatibility with automated assembly, and ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity validation.
Technical Context
The SMF36A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve low leakage (<1 µA at VWM) and stable breakdown characteristics across temperature. Its 10/1000 µs waveform response ensures robust suppression of load-dump transients and inductive switching spikes in 12 V and 24 V automotive systems.
Thermal performance is defined by RθJL = 33 °C/W and RθJA = 100 °C/W on a 5 mm × 5 mm copper pad PCB, enabling reliable operation up to TJ = 175 °C. The cathode-band polarity marking and matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT = 1 mA | 40.0–44.2 V - Confirmed avalanche onset range; ensures predictable turn-on above system nominal voltage |
| VC @ IPPM = 3.4 A | 58.1 V - Clamped voltage during 10/1000 µs surge; defines upper limit seen by downstream ICs |
| PPPM | 200 W - Peak pulse power handling capability per IEC 61000-4-5 Level 4 (2 kV) |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in low-power circuits |
| TJ max | 175 °C - Enables use in under-hood automotive environments without derating |
| Package | SOD-123W - Standardized surface-mount outline with 1.0 mm height and 0.016 g mass for high-speed placement |
Pinout & Package
The SMF36A is housed in a SOD-123W package with two terminals: anode and cathode. Polarity is indicated by a visible cathode band on the device body. The package meets UL 94V-0 flammability rating and supports reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Current exit point during reverse clamping | Connected to protected line (e.g., CAN_H, LIN, 12 V supply); cathode band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure, critical for automotive field reliability |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) |
| Moisture sensitivity level 1 | No floor-life limitation or baking required prior to reflow-reduces manufacturing overhead |
| Halogen-free construction | Meets IEC 61249-2-21, supporting RoHS-compliant and environmentally regulated end products |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs while maintaining fast response time |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LIN bus transceivers from battery transients during ignition and load dump events. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground to clamp surges exceeding 36 V. Use Value: Limits voltage seen by transceiver to ≤58.1 V, preserving SOI process integrity and meeting ISO 17987-4 immunity requirements. | Use Scenario: Safeguarding 4–20 mA current-loop analog inputs against EFT bursts in factory automation PLCs. IC Role / Device Role: Reverse-biased clamping element across input terminals to shunt fast transients before they reach op-amp front-end. Use Value: Sub-1 µA leakage prevents loop current error; 200 W pulse rating handles repetitive 5 kHz EFT bursts per IEC 61000-4-4 Level 4. |
| LED Lighting Driver Input | USB-C Power Delivery Line |
Use Scenario: Suppressing inductive kickback from relay coils driving LED arrays in commercial lighting fixtures. IC Role / Device Role: Flyback protection diode across relay coil, rated for 36 V nominal supply with 200 W surge capacity. Use Value: Prevents MOSFET gate oxide failure by limiting coil flyback voltage to 58.1 V, extending driver IC lifetime beyond 100,000 cycles. | Use Scenario: Providing secondary-level surge protection on VBUS lines in USB-C PD sink applications. IC Role / Device Role: Standoff-rated TVS on 20 V PD path, clamping ESD events per IEC 61000-4-2 ±15 kV contact discharge. Use Value: 36 V VWM allows safe operation during 20 V PD negotiation; 58.1 V VC stays below USB-C spec VBUS absolute max (28 V typical, but 30 V tolerance in some controllers). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A (Bourns) | Same VWM (36 V), higher VC (64.5 V), larger SMB package (2.5 mm × 4.5 mm vs. SOD-123W 1.7 mm × 3.5 mm) | Less suitable for space-constrained PCBs; higher thermal mass reduces response speed slightly | Choose SMBJ36A only when board layout accommodates larger footprint and higher clamping voltage is acceptable |
| P6SMB36A (Littelfuse) | Identical VWM, VBR, and VC; same SOD-123W package; 1.0 µA max IR vs. SMF36A's <1 µA typical | No functional difference in circuit behavior; identical mounting and reflow profile | Select P6SMB36A for dual-sourcing where exact parametric match and footprint compatibility are required |
Compared with SMBJ36A and P6SMB36A, the SMF36A offers the lowest clamping voltage (58.1 V) among SOD-123W-formatted 36 V TVS diodes, making it optimal for protecting ICs with tight VDD margins, while maintaining full compatibility with high-speed pick-and-place equipment.
Availability
SMF36A is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor signal conditioning, and LED driver input protection requiring stable component supply and long-term lifecycle support.
Supply support for SMF36A 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q200 qualified product lines.
The SMF36A belongs to TSC's SMF series of surface-mount TVS diodes engineered specifically for automotive and industrial applications demanding high surge immunity, low leakage, and compact packaging-targeting ISO 7637-2 and IEC 61000-4-x compliance without design compromise.
FAQ
What is the maximum clamping voltage of the SMF36A under standard test conditions?
The SMF36A has a maximum clamping voltage (VC) of 58.1 V when subjected to a 10/1000 µs waveform peak pulse current of 3.4 A. This value is measured per JEDEC standards and represents the highest voltage the SMF36A will allow to pass through during a defined surge event, ensuring downstream components remain within safe operating limits. The SMF36A maintains this clamping performance across its full operating temperature range.
Does the SMF36A meet automotive transient immunity standards?
Yes, the SMF36A is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements, covering common automotive electrical disturbances including load dump, battery disconnection, and inductive switching noise. Its 200 W peak pulse power rating and low clamping ratio make the SMF36A suitable for BCM, lighting, and body electronics applications where AEC-Q200 alignment is required.
What is the package type and mounting compatibility of the SMF36A?
The SMF36A uses the SOD-123W surface-mount package, measuring 1.7 mm × 3.5 mm × 1.0 mm with matte tin-plated leads. It is fully compatible with standard reflow soldering profiles per J-STD-002 and optimized for high-speed automated placement equipment. The SOD-123W footprint is industry-standard, allowing direct substitution in designs already using similar TVS diodes like P6SMB36A or SMAJ36A.
How does the SMF36A compare to the SMF33A and SMF40A in terms of voltage ratings?
The SMF36A sits between SMF33A (VWM = 33 V, VC = 53.3 V) and SMF40A (VWM = 40 V, VC = 64.5 V). Its 36 V working stand-off provides tighter margin above 33 V nominal systems (e.g., 24 V automotive) while avoiding unnecessary headroom that would increase VC. The SMF36A's 58.1 V clamping voltage offers superior protection compared to SMF40A's 64.5 V, especially for ICs rated to 60 V absolute maximum.
Is the SMF36A halogen-free and RoHS compliant?
Yes, the SMF36A is both RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound contains no brominated flame retardants or chlorine-based additives, and all plating and substrate materials meet EU Directive 2011/65/EU requirements. This makes the SMF36A suitable for consumer, industrial, and automotive applications where environmental compliance is mandatory.
SMF36A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-123W
- Series:
- SMF
- 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):
- 3.4A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF36A FAQ
1.How can I place an order for SMF36A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF36A 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 SMF36A reliable?
The price and inventory of SMF36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF36A is usually 5 days.
3.What payment methods are accepted for SMF36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF36A?
SMF36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF36A 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 SMF36A?
For technical support, including SMF36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF36A requirements.
6.How does Aetrix verify that SMF36A is sourced from the original manufacturer or authorized distributors?
All SMF36A 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 SMF36A meets industry standards.
7.What is the process for return or replacement of SMF36A?
All SMF36A units undergo pre-shipment inspection (PSI). If there is an issue with SMF36A, 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 SMF36A part is unused and in its original packaging.
Return procedure for SMF36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF36A Tags
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