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Taiwan Semiconductor Corporation SMF36AH
- Part No.:
- SMF36AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF36AH.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:9,709
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Product details
Overview
SMF36AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, rated for 36 V working stand-off voltage, 40.0–44.2 V breakdown voltage at 1 mA, 58.1 V clamping voltage at 3.4 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It protects automotive and industrial power rails against ISO 7637-2 pulses and ESD transients.
For engineers reviewing the SMF36AH datasheet, SMF36AH pinout, SMF36AH application, or SMF36AH equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification for automotive use, low leakage (<1 µA above 10 V), moisture sensitivity level 1 compliance, and SOD-123W thermal performance (RθJA = 100 °C/W).
Technical Context
The SMF36AH operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response to high-energy transients while maintaining low leakage and stable clamping. Its 36 V VWM enables protection of 24 V nominal systems without false triggering during normal operation.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and supports automated SMT placement. Thermal design is enabled by RθJL = 33 °C/W and RθJC = 34 °C/W on a 5 mm × 5 mm copper pad, supporting reliable operation up to TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before clamping begins; matches 24 V system rail with margin. |
| VBR @ IT = 1 mA | 40.0–44.2 V - Breakdown threshold range; ensures robust turn-on during transients without premature conduction. |
| VC @ IPPM = 3.4 A | 58.1 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress in protected circuits. |
| PPPM | 200 W - Peak pulse power handling; sustains ISO 7637-2 Pulse 1 (inductive load dump) events. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage; avoids parasitic loading on sensitive 24 V sensor or CAN bus lines. |
| TJ max | +175 °C - Extended junction temperature rating; supports under-hood automotive deployment. |
| Package | SOD-123W - Surface-mount outline with enhanced thermal pad; compatible with standard reflow profiles and J-STD-002 solderability. |
Pinout & Package
SOD-123W is a two-terminal surface-mount package with cathode band marking polarity. The device has no internal pins-its terminals are anode and cathode leads formed into gull-wing shape for PCB soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; completes clamping loop during transient events. |
| Cathode | Protected line input | Connected to the 24 V supply rail or signal line being protected; conducts surge current to ground when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Glass-passivated junction | Ensures stable VBR over time and environmental stress, minimizing parameter drift in harsh under-hood conditions. |
| ISO 7637-2 compliance | Guarantees immunity to real-world vehicle electrical disturbances including load dump (Pulse 2b), battery reversal (Pulse 1), and coupling noise (Pulse 3a/3b). |
| Moisture sensitivity level 1 | Enables unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives; supports green electronics initiatives and export compliance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) and body control modules (BCMs) from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V rail and chassis ground to clamp surges exceeding 36 V. Use Value: Limits clamped voltage to 58.1 V during 200 W transients, preventing damage to downstream LDOs, MCUs, and CAN transceivers. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in factory automation PLCs exposed to inductive switching noise. IC Role / Device Role / Timing Role: Low-leakage TVS placed across sensor supply and ground to absorb EFT bursts without affecting DC accuracy. Use Value: Sub-1 µA leakage at 36 V ensures minimal offset error in precision 4–20 mA loops and ratiometric ADC references. |
| LED Lighting Driver Protection | ESD-Sensitive Communication Port Protection |
Use Scenario: Shielding constant-current LED drivers in commercial lighting from inductive kickback during MOSFET switching. IC Role / Device Role / Timing Role: Fast-response TVS connected across driver output to absorb flyback energy from transformer or inductor. Use Value: 10/1000 µs clamping capability handles repetitive 200 W pulses without degradation, extending driver lifetime. | Use Scenario: Adding secondary-level ESD protection on RS-485 or CAN FD transceiver VCC pins in industrial gateways. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between transceiver supply and ground to shunt ±8 kV contact ESD per IEC 61000-4-2. Use Value: 58.1 V clamping prevents latch-up or oxide rupture in transceivers while maintaining 36 V operational headroom. |
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 SMAJ36A | Same SOD-123 package, 36 V VWM, but higher VC = 58.7 V and lower IPPM = 3.3 A at same PPPM. | Marginally tighter clamping tolerance; slightly higher thermal resistance (RθJA = 110 °C/W vs. 100 °C/W). | Acceptable where layout allows minor thermal derating; verify pulse waveform compatibility per ISO 7637-2 Pulse 2b. |
| ON Semiconductor SMA6J36A | Identical VWM/VBR/VC specs, but not AEC-Q101 qualified and rated only to TJ = 150 °C. | Lacks automotive qualification; unsuitable for under-hood ECUs or safety-critical modules. | Cost-effective for industrial or consumer applications where AEC-Q101 and +175 °C operation are not required. |
Compared with SMAJ36A and SMA6J36A, the SMF36AH delivers superior automotive readiness via AEC-Q101 certification, extended junction temperature range (+175 °C), and lower thermal resistance-making it the preferred choice for mission-critical 24 V rail protection where reliability and longevity are non-negotiable.
Availability
SMF36AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver surge suppression requiring stable component supply across production lifecycles.
Supply support for SMF36AH 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and AEC-Q101-compliant production lines.
The SMF series was designed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing low leakage, precise clamping, and robust thermal performance in compact SOD-123W packaging.
FAQ
What is the maximum clamping voltage of SMF36AH under a 10/1000 µs surge?
The SMF36AH has a maximum clamping voltage (VC) of 58.1 V when subjected to its rated peak pulse current of 3.4 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and ensures predictable overvoltage limiting for protected circuits. The SMF36AH maintains this clamping performance across its full operating temperature range, making it suitable for under-hood automotive applications where thermal stability is critical.
Is SMF36AH qualified for automotive use?
Yes, the SMF36AH is AEC-Q101 qualified, having passed rigorous stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JEDEC standards. This qualification confirms its suitability for automotive powertrain, body electronics, and infotainment systems. The SMF36AH's +175 °C maximum junction temperature and ISO 7637-2 compliance further validate its readiness for demanding automotive environments.
What package type does SMF36AH use, and is it compatible with standard reflow processes?
The SMF36AH uses the SOD-123W surface-mount package, featuring a thermally enhanced leadframe and matte tin-plated leads compliant with J-STD-002 solderability requirements. It is fully compatible with standard Pb-free reflow profiles, including IPC/JEDEC J-STD-020 Level 1 moisture sensitivity-eliminating bake requirements. The SMF36AH's RθJA of 100 °C/W is characterized on a 5 mm × 5 mm copper pad, enabling predictable thermal design in production PCB layouts.
How does SMF36AH compare to SMF33AH or SMF40AH in terms of system protection margin?
The SMF36AH provides optimal margin for 24 V nominal systems: its 36 V VWM exceeds typical 24 V rail tolerances (±10 %), while its 40.0–44.2 V VBR ensures clean turn-on above normal transients. In contrast, SMF33AH (33 V VWM) risks false triggering during cold-crank dips, and SMF40AH (40 V VWM) reduces clamping headroom for 24 V loads. The SMF36AH thus balances immunity and safety better than adjacent variants in the SMF family.
Does SMF36AH meet international ESD and surge immunity standards?
Yes, the SMF36AH meets ISO 7637-2 for automotive electrical disturbances (Pulse 1, 2a, 2b, 3a, 3b) and supports system-level IEC 61000-4-2 ESD immunity when used in conjunction with proper PCB layout and filtering. Its <1 µA leakage at 36 V and 58.1 V clamping enable robust protection without compromising signal integrity or power efficiency. The SMF36AH's performance is validated in real-world test setups-not just theoretical ratings.
SMF36AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF36AH FAQ
1.How can I place an order for SMF36AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF36AH 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 SMF36AH reliable?
The price and inventory of SMF36AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF36AH is usually 5 days.
3.What payment methods are accepted for SMF36AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF36AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF36AH?
SMF36AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF36AH 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 SMF36AH?
For technical support, including SMF36AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF36AH requirements.
6.How does Aetrix verify that SMF36AH is sourced from the original manufacturer or authorized distributors?
All SMF36AH 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 SMF36AH meets industry standards.
7.What is the process for return or replacement of SMF36AH?
All SMF36AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF36AH, 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 SMF36AH part is unused and in its original packaging.
Return procedure for SMF36AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF36AH Tags
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