My Inquiry
My Account
Diodes Incorporated P4SMAJ33ADF-13
- Part No.:
- P4SMAJ33ADF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 2-SMD, Flat Leads
- Datasheet:
-
P4SMAJ33ADF-13.pdf
- Description:
- TVS DIODE 33VWM 53.3VC D-FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,703
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMAJ33ADF-13 from Diodes Incorporated is a 400W surface-mount transient voltage suppressor (TVS) diode designed for unidirectional overvoltage protection in DC power lines and signal interfaces. It features a reverse standoff voltage of 33 V, clamping voltage of 53.3 V at 7.5 A peak pulse current, and IEC 61000-4-2 ESD rating of ±30 kV (air/contact). Used in industrial power supplies and automotive body electronics to protect microcontrollers and communication ICs from surge transients.
For engineers reviewing the P4SMAJ33ADF-13 datasheet, P4SMAJ33ADF-13 pinout, P4SMAJ33ADF-13 application, or P4SMAJ33ADF-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under 10/1000 µs waveform, thermal resistance on FR-4 PCB, and D-FLAT package compatibility with high-density layouts.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device that remains non-conductive below 33 V VRWM and rapidly avalanches above its 36.7–40.6 V breakdown threshold to limit transient energy. Its glass-passivated junction ensures stable leakage (<1 µA at VRWM) and repeatable clamping performance across temperature.
The device delivers 400 W peak pulse power per 10×1000 µs waveform with a typical junction-to-terminal thermal resistance of 37 °C/W when mounted on a 1"×1", 2 oz copper pad. Polarity is marked by a cathode band; anode and cathode terminals are optimized for low-inductance PCB routing in fast-rising surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - Sustains single 10×1000 µs surges without failure; derates linearly above +25°C ambient. |
| Reverse Standoff Voltage | 33 V - Maximum continuous DC or RMS voltage before significant leakage; sets upper limit for protected circuit operating voltage. |
| Breakdown Voltage | 36.7–40.6 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering before downstream IC damage thresholds. |
| Clamping Voltage | 53.3 V @ 7.5 A - Maximum voltage seen by protected load during specified surge; defines safety margin vs. IC absolute maximum ratings. |
| ESD Rating | ±30 kV (air/contact) per IEC 61000-4-2 - Validates robustness against human-body-model and contact-discharge events in end-equipment testing. |
| Junction-to-Ambient RθJA | 114 °C/W (1"×1" pad) - Determines steady-state temperature rise under 1.0 W DC dissipation; critical for layout thermal design. |
Pinout & Package
Package: D-FLAT (low-profile surface-mount), molded plastic case with UL 94V-0 flammability rating, 0.035 g weight, cathode band polarity indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current sink node | Connected to protected line; carries full surge current to ground during clamping; requires low-impedance return path. |
| 2 (Anode) | Reference/ground return | Typically tied to system ground plane; forms low-inductance loop with cathode trace to minimize voltage overshoot during fast transients. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures long-term stability of breakdown voltage and leakage current under humidity and thermal cycling stress. |
| Low-profile D-FLAT package | Reduces board space by >40% vs. SMA; enables placement near connectors or ICs where surge entry points occur. |
| Lead-free, halogen-free, RoHS 3 compliant | Meets IPC-J-STD-020 moisture sensitivity Level 1 and global environmental compliance mandates for industrial and automotive shipments. |
| 40 A peak forward surge current | Supports multiple surge events without degradation; validated under 8.3 ms half-sine wave per JEDEC standards. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND upstream of DC-DC converter input. Use Value: Clamps transients to ≤53.3 V, keeping downstream regulator input within its 60 V absolute max rating while surviving 400 W pulses. |
Use Scenario: LIN bus transceiver power supply line in door module subjected to ISO 7637-2 Pulse 1/2a/5a. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VBAT line feeding LIN PHY and MCU core supply. Use Value: Limits voltage excursion to 53.3 V during 100 V/50 ms load dump, preventing latch-up or permanent damage to 5 V LDOs and transceivers. |
| USB-C Port ESD Protection | Smart Meter Communication Interface |
Use Scenario: VBUS line in USB-C receptacle on portable test equipment handling hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Secondary clamping stage after polymer PTC, positioned adjacent to USB controller VBUS pin. Use Value: Absorbs ±30 kV ESD strikes per IEC 61000-4-2 without degradation, maintaining <1 µA leakage at 33 V to avoid battery drain. |
Use Scenario: RS-485 transceiver power rail in utility smart meters installed in electrically noisy substations. IC Role / Device Role / Timing Role: DC rail protector on isolated 5 V supply feeding RS-485 driver/receiver ICs. Use Value: Withstands repetitive 400 W surges from nearby lightning-induced coupling, preserving data integrity over 15+ year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Same 33 V VRWM, but SMB package (larger footprint, higher RθJA = 140 °C/W); 600 W peak power rating. | Preferred where higher surge margin is needed and board space allows larger package; less suitable for ultra-thin modules. | Select when surge energy exceeds 400 W or thermal budget permits larger thermal pad area. |
| 1.5SMC33A | Same 33 V VRWM, DO-214AB package; 1500 W peak power, higher clamping voltage (59.3 V). | Used in legacy designs with through-hole or larger SMT footprints; higher clamping reduces design margin for 5 V logic rails. | Choose only if existing PCB layout cannot accommodate D-FLAT dimensions or if legacy BOM consolidation is required. |
Compared with SMBJ33A and 1.5SMC33A, P4SMAJ33ADF-13 offers optimal balance of compact D-FLAT footprint, 53.3 V clamping headroom for 3.3/5 V systems, and verified 400 W surge handling-making it ideal for space-constrained industrial and automotive ECUs where thermal management is tightly coupled to PCB copper area.
Availability
P4SMAJ33ADF-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, USB-C interface protection, and smart meter communication interfaces requiring stable component supply and long-term lifecycle support.
Supply support for P4SMAJ33ADF-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in California, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
This device belongs to Diodes' P4SMAJ series of surface-mount TVS diodes, engineered specifically for high-reliability transient suppression in automotive, industrial, and communications equipment where compact size and repeatable clamping performance are critical.
FAQ
What is the maximum operating temperature for P4SMAJ33ADF-13?
The device has an operating junction temperature range of –55 °C to +150 °C. Its thermal resistance (RθJA = 114 °C/W on 1"×1" FR-4) means that at 1.0 W steady-state dissipation, junction temperature rises ~114 °C above ambient-so maximum ambient must be limited to +36 °C for safe 150 °C TJ. Derating curves in Figure 1 define safe power limits above +25 °C.
Does P4SMAJ33ADF-13 meet automotive AEC-Q200 requirements?
No-P4SMAJ33ADF-13 is not AEC-Q200 qualified. Diodes Incorporated offers the automotive-grade A4SMAJ33ADF-13 variant, which undergoes extended temperature cycling, vibration, and humidity testing per AEC-Q200 Rev H. This standard part is rated for industrial use only and lacks the qualification documentation required for automotive production.
How does the D-FLAT package affect PCB layout for surge suppression?
The D-FLAT package's 2.25–2.95 mm width and 3.95–4.60 mm length require precise pad geometry per Diodes' suggested layout (0.50–1.30 mm lead length, 0.90–1.10 mm thickness). Its low profile (≤1.10 mm height) minimizes parasitic inductance, but thermal performance depends critically on copper pad area-reducing pad size below 1"×1" increases RθJA to 88 °C/W, raising risk of thermal runaway under repeated surges.
Can P4SMAJ33ADF-13 be used for bidirectional transient protection?
No-it is a unidirectional TVS diode with cathode/anode polarity. For bidirectional protection (e.g., AC lines or differential buses), a symmetric device like P4SMAJ33CA-13 (common-anode dual diode) or separate back-to-back configuration is required. Using this part in reverse-biased mode beyond its 33 V VRWM risks premature conduction and unreliable clamping.
P4SMAJ33ADF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 2-SMD, Flat Leads
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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:
- D-Flat
P4SMAJ33ADF-13 FAQ
1.How can I place an order for P4SMAJ33ADF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMAJ33ADF-13 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 P4SMAJ33ADF-13 reliable?
The price and inventory of P4SMAJ33ADF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMAJ33ADF-13 is usually 5 days.
3.What payment methods are accepted for P4SMAJ33ADF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMAJ33ADF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMAJ33ADF-13?
P4SMAJ33ADF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMAJ33ADF-13 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 P4SMAJ33ADF-13?
For technical support, including P4SMAJ33ADF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMAJ33ADF-13 requirements.
6.How does Aetrix verify that P4SMAJ33ADF-13 is sourced from the original manufacturer or authorized distributors?
All P4SMAJ33ADF-13 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 P4SMAJ33ADF-13 meets industry standards.
7.What is the process for return or replacement of P4SMAJ33ADF-13?
All P4SMAJ33ADF-13 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMAJ33ADF-13, 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 P4SMAJ33ADF-13 part is unused and in its original packaging.
Return procedure for P4SMAJ33ADF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMAJ33ADF-13 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
