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STMicroelectronics LDP01-47AY
- Part No.:
- LDP01-47AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LDP01-47AY.pdf
- Description:
- TVS DIODE 40VWM 63VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,008
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Product details
Overview
LDP01-47AY from STMicroelectronics is an automotive-grade Transil™ TVS diode designed for load-dump protection in 12 V and 24 V vehicle electrical systems. It features a 47 V nominal breakdown voltage (VBR = 44.4–49 V at IR = 1 mA), clamps to ≤76.5 V at 950 A (10/1000 µs), and operates up to Tj = 175 °C - enabling robust surge suppression in engine control units, body control modules, and powertrain ECUs.
For engineers reviewing the LDP01-47AY datasheet, LDP01-47AY pinout, LDP01-47AY application, or LDP01-47AY equivalent, key selection criteria include ISO 7637-2 Pulse 5a/b and ISO 16750-2 Test A/B compliance, low leakage (<1 µA at 25 °C), D²PAK thermal performance (Rth(j-c) = 0.24 °C/W), and AEC-Q101 qualification for under-hood deployment.
Technical Context
The LDP01-47AY is a unidirectional, planar-junction TVS diode optimized for high-energy transients in automotive supply rails. Its design targets ISO 7637-2 Pulse 5a (load dump, VS = −150 V) and Pulse 5b (VS = +112 V), as well as ISO 16750-2 Tests A (US up to 90 V) and B (US* up to 85 V), with clamping validated at 950 A peak pulse current (10/1000 µs).
It delivers stable performance across −55 °C to +175 °C junction temperature, supported by a temperature coefficient αT = 10.1 × 10−4/°C for VBR and VCL, and maintains <1 µA leakage at rated stand-off voltage (VRM = 40 V) - critical for low-power always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 44.4–49 V at IR = 1 mA - defines minimum conduction threshold during overvoltage events |
| Stand-off Voltage (VRM) | 40 V - maximum continuous reverse voltage before leakage exceeds 1 µA |
| Clamping Voltage (VCL) | ≤76.5 V at IPP = 950 A (10/1000 µs) - limits downstream IC stress during load dump |
| Peak Pulse Power (PPP) | 5.4 kW at Tj = 25 °C - supports high-energy transient absorption without thermal runaway |
| Junction Temperature Range | −55 to +175 °C - enables placement near heat sources (e.g., power MOSFETs, ignition coils) |
| AEC-Q101 Compliance | Qualified per automotive reliability standard - validates suitability for safety-critical ECU applications |
| ISO Standards | Complies with ISO 7637-2 (Pulses 1, 2a, 3a/b, 5a/b) and ISO 16750-2 (Tests A & B) |
Pinout & Package
Package: D²PAK (TO-263AB), JEDEC registered, UL 94 V0-rated epoxy, surface-mount with exposed copper drain tab for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Tab) | Common cathode connection point | Electrically tied to metal tab - must be soldered to PCB copper pour for thermal and electrical grounding |
| Cathode (Pin 1) | Surge current return path | Connected to protected circuit ground; carries full 950 A transient current during clamping |
| Anode (Pin 2) | Supply rail input | Connected to battery or alternator line; withstands −150 V to +112 V transients per ISO 7637-2 |
Key Features
| Feature | Design Value |
|---|---|
| High-Temperature Operation | Rated for continuous operation at Tj = 175 °C - eliminates derating in under-hood environments |
| Low Leakage Current | ≤1 µA at VRM = 40 V and 25 °C - preserves battery life in always-on vehicle networks |
| Robust Clamping Consistency | VCL variation < ±5% across temperature (−55 to +175 °C) due to αT = 10.1 × 10−4/°C |
| D²PAK Thermal Performance | Rth(j-c) = 0.24 °C/W - enables >5 kW pulse power handling with minimal junction rise |
| Automotive Qualification | AEC-Q101 qualified and RoHS/halogen-free - meets OEM component sourcing requirements |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protects microcontroller power rails and CAN transceivers from alternator load-dump spikes during battery disconnect. IC Role / Device Role: Primary overvoltage clamp on 12 V main supply input, placed upstream of DC-DC converters. Use Value: Limits transient voltage to ≤76.5 V at 950 A, preventing latch-up or gate oxide damage in 3.3 V/5 V logic ICs. |
Use Scenario: Shields LIN bus transceivers and LED driver ICs from ISO 16750-2 Test A surges during ignition cycling. IC Role / Device Role: Unidirectional TVS on 12 V auxiliary rail feeding lighting and door module electronics. Use Value: Maintains <1 µA leakage at 40 V stand-off, ensuring zero impact on sleep-mode current budgets. |
| Transmission Control Module (TCM) | Advanced Driver Assistance System (ADAS) Power Supply |
|
Use Scenario: Guards solenoid driver ICs and position sensor interfaces against ISO 7637-2 Pulse 5b (+112 V) during gear-shift transients. IC Role / Device Role: High-power TVS on 24 V supply rail, mounted directly to heatsink via D²PAK tab. Use Value: Delivers Rth(j-c) = 0.24 °C/W thermal path - sustains repeated 5 kW pulses without exceeding 175 °C junction limit. |
Use Scenario: Safeguards radar and camera power supplies from coupled noise during ESD events (IEC 61000-4-2, ±30 kV). IC Role / Device Role: Secondary protection stage after front-end filter, clamping fast-rising ESD-induced overshoot. Use Value: Achieves <30 kV air/contact discharge immunity while adding <0.5 nF capacitance - no signal integrity impact on 77 GHz radar lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ47A | DO-214AC package; lower PPP = 400 W; VBR = 44.7–49.4 V; Rth(j-c) ≈ 50 °C/W | Not suitable for load-dump - limited to ESD/low-energy transients; requires external heatsinking for >100 A pulses | Select only for cost-sensitive non-load-dump applications where space constraints prohibit D²PAK |
| SMCJ47A | DO-214AB package; PPP = 1500 W; VBR = 44.7–49.4 V; Tj(max) = 150 °C; no AEC-Q101 certification | Meets ISO 7637-2 Pulse 1/2a but not Pulse 5a/b; insufficient for sustained load-dump energy | Acceptable for non-safety-critical infotainment systems lacking AEC-Q101 requirement |
Compared with SMAJ47A and SMCJ47A, the LDP01-47AY uniquely combines AEC-Q101 qualification, 175 °C operation, D²PAK thermal efficiency (0.24 °C/W), and validated ISO 7637-2 Pulse 5a/b clamping - making it the only drop-in solution for high-reliability powertrain and ADAS supply protection.
Availability
LDP01-47AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control modules requiring stable component supply across extended automotive product lifecycles.
Supply support for LDP01-47AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and automotive ICs for industrial and transportation markets.
The LDP01-xxAY series belongs to ST's Transil™ automotive TVS portfolio, engineered specifically to replace older Zener-based solutions with higher surge capability, tighter parametric control, and guaranteed AEC-Q101 reliability for modern 12 V/24 V vehicle architectures.
FAQ
What is the maximum peak pulse current the LDP01-47AY can handle?
The LDP01-47AY is rated for 950 A peak pulse current under the 10/1000 µs waveform at Tj = 25 °C, with clamping voltage ≤76.5 V. At Tj = 175 °C, its derated peak pulse power drops to ~2.8 kW, corresponding to ~550 A under the same waveform - verified in Figure 3 of the official datasheet (DocID026556 Rev 2).
Is the LDP01-47AY bidirectional or unidirectional?
The LDP01-47AY is a unidirectional TVS diode, designed for protection of positive-supply rails only. Its schematic symbol shows cathode-to-rail orientation, and all ISO 7637-2 and ISO 16750-2 test data in the datasheet assume unidirectional configuration - confirmed by the "Automotive TVS for load dump protection" designation and absence of reverse standoff rating.
How should the D²PAK tab be connected on the PCB?
The metal tab (anode) must be soldered to a large, thermally robust copper pour connected to system ground. Per Figure 19 and Table 5, the tab occupies the full underside of the D²PAK package and serves as both electrical return and primary thermal path - inadequate copper area causes junction overheating and premature failure during repetitive load-dump events.
Does the LDP01-47AY meet ISO 10605 for ESD protection?
Yes - the LDP01-47AY exceeds IEC 61000-4-2 Level 4 (±30 kV air/contact discharge) and fully complies with ISO 10605 (C = 330 pF, R = 330 Ω) at ±30 kV, as stated in the "Complies with the following standards" section of the datasheet. Its low dynamic impedance (RD = 29 mΩ) ensures rapid clamping response to sub-nanosecond ESD events.
LDP01-47AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- LDP01Y, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 63V
- Current - Peak Pulse (10/1000µs):
- 65A
- Power - Peak Pulse:
- -
- 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:
- D2PAK
LDP01-47AY FAQ
1.How can I place an order for LDP01-47AY through Aetrix?
Please submit a Request for Quotation (RFQ) for LDP01-47AY 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 LDP01-47AY reliable?
The price and inventory of LDP01-47AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP01-47AY is usually 5 days.
3.What payment methods are accepted for LDP01-47AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP01-47AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDP01-47AY?
LDP01-47AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDP01-47AY 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 LDP01-47AY?
For technical support, including LDP01-47AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP01-47AY requirements.
6.How does Aetrix verify that LDP01-47AY is sourced from the original manufacturer or authorized distributors?
All LDP01-47AY 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 LDP01-47AY meets industry standards.
7.What is the process for return or replacement of LDP01-47AY?
All LDP01-47AY units undergo pre-shipment inspection (PSI). If there is an issue with LDP01-47AY, 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 LDP01-47AY part is unused and in its original packaging.
Return procedure for LDP01-47AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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